Academic literature on the topic 'Hollow concrete slab'

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Journal articles on the topic "Hollow concrete slab"

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Renkas, A. A. "FIRE RESISTANCE PROVIDING OF HOLLOW‐CORE CONCRETE SLABS USING SHEET BUILDING MATERIALS." Fire Safety, no. 34 (July 19, 2019): 72–77. http://dx.doi.org/10.32447/20786662.34.2019.12.

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Introduction. This paper deals with the analysis of world experience in fire resistance providing of hollow‐core concrete slabs. To protect concrete structures are used many structural applications: thermal coatings and materials. The research first analyzes main methods and hypothesis using to make temperature analysis of solution fire resistance of concrete structures. Problem of making temperature analysis of hollow‐core concrete slabs are nonlinear thermal material properties and radiation heat transfer in the hollow-cores. The aim of this paper is to establish the temperature distribution in hollow‐core concrete slab considering radiation heat transfer in the hollow-cores in case of fire in compartment that is spreading by standard temperature-time curve. In addition, the aim is to substantiate the possibility of using gypsum panels to provide fire resistance of hollowcore concrete slabs. Material statement. The paper reports the results of modeling the process of heat transfer in hollow‐core concrete slab, between compartment space and slab surface and in hollow‐cores. To calculate temperature fields in hollow‐core concrete slab considering nonlinear thermal material properties and radiation heat transfer in the hollow-cores was used finite element model. At addition, the results of finite elements simulations show temperature fields in hollow‐core concrete slab and gypsum panels that installed under concrete slab. Scientific novelty. The paper reports results of theoretic substantiated of possibility of using gypsum panels to protect of hollow‐core concrete slabs considering nonlinear thermal material properties, radiation heat transfer between surfaces and radiation heat transfer in the hollow-cores. The results indicate that using gypsum panels to protect of hollow‐core concrete slabs reduces speed heating of concrete elements to critical temperatures that increase fire resistance of hollow‐core concrete slabs to 20.4 %.
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Valivonis, Juozas, Bronius Jonaitis, Robertas Zavalis, Tomas Skuturna, and Arnoldas Šneideris. "FLEXURAL CAPACITY AND STIFFNESS OF MONOLITHIC BIAXIAL HOLLOW SLABS." JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT 20, no. 5 (October 20, 2014): 693–701. http://dx.doi.org/10.3846/13923730.2014.917122.

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The article presents a research on flexural behaviour of hollow monolithic reinforced concrete slabs. It focuses on the results of experimental investigation into full-size hollow reinforced concrete slabs and analyses their flexural capacity and stiffness. The self-weight of the slabs directly depends on the shape and number of hollows. An increase in the hollowness of a slab significantly reduces the load caused by self-weight. This allows increasing the estimated length of the slab under the same payload. An increase in the amount of hollows of the slab changes the stiffness of the slab cross-section that has a direct impact on slab deflection. Considering the shape of the slab cross-section, theoretical calculations of the flexural capacity and deflection of experimental slabs were made. The design of a new type of slabs and variations in different parameters of the slab experience difficulties in conducting a large amount of experimental tests. Therefore, the initial analysis may apply to numerical simulation. The paper describes the principles of designing a numerical model. The calculations were made using DIANA software. The stiffness and flexural capacity of the hollow slabs were established employing numerical simulation compared to the results of experimental investigations. The findings indicate that numerical simulation can be applied for analysing the stress state of the examined structures.
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Surianinov, Mykola, Stepan Neutov, Iryna Korneieva, and Maryna Sydorchuk. "Study and Comparison of Characteristics of Models of Hollow-Core Slabs, Reinforced Concrete and Steel-Fiber Concrete." Key Engineering Materials 864 (September 2020): 9–18. http://dx.doi.org/10.4028/www.scientific.net/kem.864.9.

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Two models of hollow core slabs were tested: reinforced concrete and steel fiber concrete. When designing slab models, the proportions of full-sized structures were preserved for the further possibility of correct data comparison. As a result of testing models of hollow core slabs, it was found that the bearing capacity of a slab with combined reinforcement is 24% higher than that of reinforced concrete, the deflection is 36% less, and the crack resistance is 18% higher. The use of steel fiber made it possible to avoid the brittle fracture of a steel fiber reinforced concrete slab, which was observed in the model of a conventional reinforced concrete slab.
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Zhao, Xin, Dan Dan Kong, Zhi Wei Zhang, and Mai Wu. "Study on Mechanical Behaviors of New Reinforced Concrete Hollow Floor Slab." Applied Mechanics and Materials 94-96 (September 2011): 1018–21. http://dx.doi.org/10.4028/www.scientific.net/amm.94-96.1018.

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In this paper a new type of reinforced concrete four-way rib hollow slab was proposed by the authors first. Further in order to research on the mechanical properties of the new floor slab the other two common slabs were compared with the new one, that was two-way rib hollow slab and solid slab. The rational finite element (FE) models of the three kinds of slabs supported by four corner columns were built up respectively by ANSYS. The deflection and stress of the three kinds of slabs under three load cases were calculated separately, on the basis of which thorough comparisons and analysis were carried out. The study results showed that the new reinforced concrete four-way rib hollow floor slab has superior mechanical properties.
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Nassif Sabr, Yousif, Dr Husain Khalaf Jarallah, and Dr Hassan Issa Abdul Kareem. "Improving the Shear Strength of Lightweight RC Thick Hollow Core Slab Made of Recycled Materials." International Journal of Engineering & Technology 7, no. 4.20 (November 28, 2018): 403. http://dx.doi.org/10.14419/ijet.v7i4.20.26143.

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This research paper focused on the experimental study about shear behavior of reinforced concrete thick hollow core slab. The reduction hollow length technique was used to resist the shear failure that occurred in the thick hollow core slab. The three hollows were used in tested slabs. The effect of reduction in the length of hollow in the shear region as well as the sides hollow was considered in the shear behavior of the tested hollow core slab. The recyclable material was used to a get of lightweight concrete, where the crushed clay brick was used as a coarse aggregate instead of the gravel. The test was done by applying two line load. The specimens were tested up to failure. The experimental results showed an increase in the shear strength up to 109.52% and an increase in the deflection up to 24% compared with the hollow core slab specimen that all hollow core is accessible. From the experimental result of this investigation can avoid the shear failure subsequently the load devolves from the shear region to the flexural region with change the mode of failure from shear failure to flexural-shear failure.
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Yang, Xiao Hua, and Cao Yang Zhou. "Simplified Calculation Method for Deflection of Concrete Cellular Slab." Advanced Materials Research 1049-1050 (October 2014): 196–200. http://dx.doi.org/10.4028/www.scientific.net/amr.1049-1050.196.

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The continuity of concrete cellular slab was damaged by tubular hollow tubes which are arranged in slabs in parallel and the mechanical properties of slab exists anisotropy leading by different shapes of cross section in both directions of parallel and vertical to hollow tubes. Slab stiffness is weak greatly in direction of parallel to hollow tubes. For concrete cellular slab, the mechanical and deformation properties have been studied, the rigidity and stiffness ratio formula in both directions are been given. Orthotropic slab analogue method that is simplified calculation method for slab deflections are put out. The calculated results show that this method is adaptable and processes are simple. The calculated results are close to with engineering practices.
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Yang, Xiao Hua, Chao Yang Zhou, Xue Jun He, and Teng Chen. "Research on Post-Tensioned Unbonded Prestressed Concrete Hollowed Floor." Applied Mechanics and Materials 94-96 (September 2011): 1456–62. http://dx.doi.org/10.4028/www.scientific.net/amm.94-96.1456.

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In order to study the mechanical behaviors of post-tensioned unbonded prestressed concrete hollowed floors, a 1/4 scale post-tensioned unbonded prestressed reinforced concrete hollow slab-column structure model is used to act uniform distributed load on the floor. The test results showed that the load carrying capacity is enough. The points of maximum displacement are at the centers of slabs. By means of the experimental studies and elastic finite element analysis methods, the results showed that post-tensioned unbonded prestressed concrete hollowed floor presents anisotropy with layout of circular-tubes in one way. In direction parallel to layout of hollowed tubes, the continuity of floor is destruction and bending stiffness of slab is weakened. For studying the deformations of slab, it can still be considered continuous cross-slab in two directions.
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Zhang, Jing Shu, Huan Huan Nie, Yuan Long Yang, and Yuan Yao. "Research and Application of Pre-Stressed Concrete Composite Slabs." Applied Mechanics and Materials 166-169 (May 2012): 131–39. http://dx.doi.org/10.4028/www.scientific.net/amm.166-169.131.

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The pre-stressed concrete composite slab, which combines the advantages of cast-in-place slabs and precast slabs, has promising development prospects. In the paper, according to structural integrity, bond performance, sound insulation, thermal preservation and construction techniques, four categories composite slab, such as the composite slab with flat bottom panel (including the composite slab with bar truss reinforced precast concrete bottom panel), the concrete composite slab with precast ribbed panel, the composite slab with hollow bottom panel and the composite slab with sandwich bottom panel are studied. The composite slab with flat bottom panel has poor structural integrity, and its bond performance and crack resistance of edge joint details need to be improved; the composite slab with bar truss reinforced precast concrete bottom panel has enough bond force, but its storage and transportation are inconvenient; the concrete composite slab with precast ribbed panel has good structural integrity and convenient construction procedure; the composite slab with hollow bottom panel and the composite slab with sandwich bottom panel have functions of sound insulation and thermal preservation, however they are inadequacy to resist bending moment and have complex construction procedure. The concrete composite slab with precast ribbed panel is provided with good mechanical behavior, economy and practicability, and is worth further researching and promoting.
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Li, Shiping, and Chao Song. "Mechanical performance test and analysis of prestressed lightweight aggregate concrete hollow slab." Advances in Structural Engineering 22, no. 8 (February 3, 2019): 1830–44. http://dx.doi.org/10.1177/1369433219825998.

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To investigate the mechanical performance of prestressed lightweight aggregate concrete hollow slabs, a symmetric loading test was performed on eight prestressed concrete hollow slabs categorised into four groups based on their variety of coarse aggregate concrete and span, and their respective failure mode, bearing capacity, deformation performance and crack propagation were analysed. Based on the test data, a simulation model was subsequently established to simulate and analyse the test components. The test results showed that the bending process of the prestressed lightweight aggregate concrete hollow slab goes through three stages: elasticity, elasto-plasticity and plasticity. Furthermore, its bearing capacity and failure characteristics are similar to those of a prestressed ordinary concrete hollow slab. Subsequently, we derived a formula for checking the calculation of crack width by introducing a comprehensive influence coefficient of concrete Cm and combining it effectively with the formula in the current code and verified its efficacy. The calculated value of the formula agrees well with the test results, providing a reference for the application of engineering and a supplementary calculation formula for the crack width of lightweight aggregate concrete hollow slabs.
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Jendzelovsky, Norbert, and Kristina Zabakova Vrablova. "Comparison of Natural Frequencies of Hollow Core Slabs." Applied Mechanics and Materials 769 (June 2015): 225–28. http://dx.doi.org/10.4028/www.scientific.net/amm.769.225.

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This article is devoted to the calculation of natural frequencies of concrete slabs. Natural frequencies of a solid slab and a hollow core slab have been compared. Solid slab and lightened slab with reduced self-weight and stiffness have been modeled using FEM software ANSYS as 2D model using shell elements. Third model was made from 3D elements as a hollow core slab. Two types of boundary conditions have been considered: a simply supported slab and a clamped slab. The changes in natural frequencies according to aspect ratio of the slab were compared, too. Numerical methods have been compared with simplified method of calculation of natural frequency of slabs, as e.g. an equivalent plate approach; approximation presented by Hearmon and compilation of formulas by Bachmann.
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Dissertations / Theses on the topic "Hollow concrete slab"

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Ho, S. L. "An investigation into the behaviour of hollow ribbed (waffle) rectangular reinforced concrete slabs at ultimate limit state." Thesis, University of Abertay Dundee, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234752.

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Eriksson, Alexander, and Veronica Flykt. "Concrete floor : Design of prefabricated pre-stressed hollow core slabs with verification through PRE-Stress and comparison with site-cast slab." Thesis, KTH, Byggteknik och design, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-279158.

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The most common prefabricated concrete slabs are hollow core slabs, which are usually pre-tensioned. How to design these parts is not compiled today in a manual where it is clear how this is done, this knowledge is generally classified as expert knowledge. The purpose was to bring forth how to design prefabricated pre-stressed hollow core slabs, HD/F, and then create a design aid that is compared by hand calculations with the PRE-Stress design program from StruSoft. Furthermore, to compare it with site-cast concrete slabs to see differences in the amount of material and the thickness of the structure under the same conditions.The design aid is not complete as some limitations had to be made. When it comes to results, the hand calculations in comparison with PRE-Stress have not resulted in identical answers but have proven to be on the safe side consistently through the design, which indicates that the design aid is fully functional. In the comparison with site-cast concrete slabs, it can be noted that prestressed hollow core slabs require less concrete volume, slimmer construction, and longer span widths but greater reinforcement volume.
Det vanligaste prefabricerade betongbjälklaget är håldäcksplattor som oftast är spännarmerade. Hur man dimensionerar dessa bärverksdelar finns idag inte samlat i en handbok där det står tydligt hur man gör, den kunskapen klassas generellt som expertiskunskap. Syftet var att ta fram hur man dimensionerar prefabricerade förspända håldäcksplattor, HD/F, och sedan skapa ett dimensioneringshjälpmedel som jämförs genom handberäkningar med PRE-Stress dimensioneringsprogram från StruSoft. Vidare genomfördes jämförande beräkningar för platsgjutet betongbjälklag för att se skillnader i materialmängd och konstruktionstjocklek under samma förutsättningar.Dimensioneringshjälpmedlet är inte komplett då vissa avgränsningar behövts göras. När det kommer till resultat har handberäkningar i jämförelse med PRE-Stress inte resulterat i identiska svar, men visat sig hamna på säkra sidan konsekvent genom dimensioneringen vilket tyder på att dimensioneringshjälpmedlet är fullt användbart. I jämförelsen med platsgjutet bjälklag kan man konstatera att förspända håldäcksplattor ger mindre betongvolym, slankare konstruktion och längre spännvidder men större armeringsmängd.
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Kareliusson, Filip, and Thomas Lipecki. "Bjälklag i Betong är billigare än Korslimmat trä : en jämförelse mellan bjälklagskonstruktioner." Thesis, Mittuniversitetet, Avdelningen för ekoteknik och hållbart byggande, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-31522.

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Byggnadstaktenav flerbostadshus i Sverige ligger på en hög nivå och ökar. Detta medför kravpå en snabb byggprocess. En lösning för att snabba på byggprocessen äranvändandet av prefabricerade delar. Författarnas uppgift, i samarbete med WSPSverige AB, är att utveckla ett hjälpmedel för konstruktörer som jämför fyraolika bjälklag, varav ett i korslimmat trä, två prefabricerade betongelementoch en platsgjuten konstruktion. Målet är att framställa en tabell som beaktarfaktorer som påverkar valet av stomsystem och som presenterar vilket avbjälklagen som är mest kostnadseffektivt. Rapporten sammanställdes under 10veckor och avgränsades till bjälklag i flerbostadshus upplagda på två stöd somuppfyller relevanta krav för dimensionering, beaktar torktid med fastaförutsättningar, leveranstid avseende produktionstid hos de prefabriceradeelementen och miljöpåverkan avseende CO2-ekvivalenta utsläpp iproduktionsskedet. Studiens resultat grundar sig på litteraturstudier ochintervjuer, kalkylhjälpmedel och beräkningsprogram som är vanliga i branschen.Resultatet visar att: · trä genererar lägst koldioxidutsläpp avbjälklagsalternativen · betong är, ur ett brand- och ljudperspektiv, detlämpligaste materialet · korslimmade träbjälklaget får den högsta byggnadshöjdenoch den högsta kostnaden per kvadratmeter · håldäcksbjälklag har den kortaste leveranstiden · det slakarmerade plattbärlag samt det platsgjutnabetongbjälklaget har längst torktid · den platsgjutna bjälklagskonstruktionen är detmest kostnadseffektiva bjälklaget av de fyra som har jämförts.
The building pace of multi apartment houses in Sweden is at a high leveland is increasing. This induces demands of a quick building process. Onesolution to quicken the building process is the use of prefabricated elements.The authors’ task, in collaboration with WSP Sverige AB, is to develop anaiding tool for engineers who compare different slabs, one cross laminatedwood, two precast concrete components and one construction cast in-place. Thegoal is to produce a table that considers factors that affects the choice ofstructure and presents which of the slabs that is most cost effective. Thepaper was compiled over a period of 10 weeks and limited to slabs inmulti-apartment buildings supported on two sides that meet relevantrequirements for dimensioning, consider hydration time with set conditions,delivery time regarding production time for the precast components andenvironmental effects considering CO2-equivalent emissions in the productionstage. The results of the study are founded on literature and interviews,calculation-aids and computational programs that are common in the industry.The outcome shows that: · woodgenerates the least amount of carbondioxide emissions of the slab alternatives · concrete is, from a fire- and acoustic perspective, the most suitable material · thecross laminated slab renders the highest cross-section and the highest cost persquare meter · hollow core slabs has the shortest delivery time · theconventionally reinforced precast slabs and the in-situ cast floor slabs havethe longest hydration times · thein situ slab is the most cost effective slab of the four that have beencompared.

Betyg 170707, H14.

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Santos, Andreilton de Paula. "Análise da continuidade em lajes alveolares: estudo teórico e experimental." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-18122014-100018/.

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A maioria dos edifícios de concreto pré-moldado, construídos no Brasil e no exterior, é constituída por lajes alveolares. Este trabalho considera o estudo da continuidade dessas lajes. No cálculo desses elementos, a prática comum é considerá-los como simplesmente apoiados. Para melhorar o desempenho, é possível promover a continuidade nos apoios intermediários. Isso pode ser feito colocando armadura na região tracionada da ligação, no interior da capa, ou através de barras concretadas dentro dos alvéolos. O objetivo deste trabalho é investigar o comportamento de pavimentos formados por lajes alveolares com continuidade, com armadura na capa. Para isso, foi realizado um estudo envolvendo análise teórica e experimental em três modelos. Esses modelos, em escala real, foram submetidos a um carregamento transversal, distribuído de forma linear. Os estudos teóricos consideraram uma simulação numérica com elementos de viga e a fórmula de Branson para descrever o comportamento não linear físico do material. Além disso, foram avaliadas as expressões dos principais códigos nacionais e internacionais, no que diz respeito à ruptura por cisalhamento da seção transversal e da interface laje-capa. Os resultados da análise experimental indicaram que o modelo 1 rompeu por cisalhamento da seção transversal, com o mecanismo de tração diagonal do concreto. O modelo 2 apresentou ruptura por cisalhamento da interface. No modelo 3, a ruptura foi por flexão. O comportamento dos modelos ensaiados foi governado pela fissuração da capa na região de momento negativo. A análise teórica com elementos de barra representou de forma satisfatória o comportamento dos modelos ensaiados. As únicas formulações que apresentaram resultados coerentes com os três ensaios foram: EUROCODE 2:2004, para o cálculo da resistência ao cisalhamento da interface, e FIB MODEL CODE 2010, para o cálculo da resistência ao cisalhamento da seção transversal. Conclui-se que a continuidade melhora o desempenho das lajes alveolares, uma vez que reduz os deslocamentos no meio do vão e aumenta a capacidade de carga.
Most buildings of precast concrete built in Brazil and abroad consist of hollow core slabs. This paper considers the study of the continuity of these slabs. In design of these elements the common practice is to consider them as simply supported. To improve the performance it is possible to promote the continuity in the intermediate supports. This can be done by placing reinforcement in the tensioned region of the connection, inside the topping, or by bars concreted inside the voids. The aim of this work is to investigate the behavior of hollow core floors with continuity, with reinforcement in the topping. For this, a study involving theoretical and experimental analysis was conducted in three models. The full-scale models were subjected to a transverse loading distributed linearly. The theoretical studies have considered a numerical simulation with beam elements and the Branson formula to describe the physical nonlinear behavior of the material. Furthermore, the specifications of the major Brazilian and international codes were evaluated, with respect to failure by shear of the cross section and the slab-topping interface. The results of the experimental analysis indicated that the model 1 failed by shear of the cross section with the mechanism of diagonal tension of the concrete. Model 2 presented shear failure of the interface. In model 3, the failure was by flexure. The behavior of the tested models was ruled by cracking of the topping in region of negative bending moment. Theoretical analysis with beam elements represented satisfactorily the behavior of the tested models. The only formulations that presented consistent results with the three tests were: EUROCODE 2:2004, to calculate the shear strength of the interface, and FIB MODEL CODE 2010, for calculating of the shear strength of the cross section. It is concluded that the continuity improves the performance of the hollow core slabs, as it reduces the displacements at mid-span and increases the bearing capacity.
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Woods, Lisa Joy. "The significance of negative bending moments in the seismic performance of hollow-core flooring." Thesis, University of Canterbury. Civil and Natural Resources Engineering, 2008. http://hdl.handle.net/10092/2042.

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Hollow-core flooring units are designed as simply supported members. However, frequently in construction, continuity is established between the units and supporting structure by the addition of insitu topping concrete and steel reinforcement. This change in structural form can result in negative bending moments and axial forces being induced in the floor by seismic and other structural actions. Significant negative moments are induced by load combinations that include the effects of seismic forces due to vertical ground motion. The focus of this research was two failure mechanisms possible under these loading conditions, a flexural failure and a shear failure. Both failure mechanisms were investigated analytically and experimentally. A brittle flexural failure was observed experimentally in a sub assembly test that contained starter bars and mesh reinforcement in the insitu topping concrete. The failure occurred at loads lower than those predicted using standard flexural theory. It appears that, due to the prestressing and low reinforcement ratio of the topping concrete, the assumption that plane sections remain plane is not appropriate for this situation. It is proposed that a strain concentration factor be introduced to account for the effects of tension stiffening. This factor improves the correlation between observed and predicted flexural strength. The second failure mode investigated was a flexure shear failure in a negative moment zone. Flexural cracks reduce the shear strength of a reinforced concrete member. Analytical predictions suggest that some hollow-core floor details could be prone to this type of brittle failure. A flexure shear failure was not observed experimentally; however, this does not eliminate the possibility of this failure mode. A summary of other failure mechanisms possible in hollow-core flooring is also presented. All failure modes should to be considered as part of establishing a hierarchy of failure in the design or retrofit of hollow-core floors.
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Tarek, Asmaa, and Zhir Farhad. "Implementering av VBS system i Sverige." Thesis, Örebro universitet, Institutionen för naturvetenskap och teknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-84294.

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Betong är idag ett av de material som vi använder mest i byggbranschen och det har sinaföljder. Mer än 50 % av energiutsläppen från byggplatsen kommer från cementtillverkningen.Voided biaxial slab eller VBS är en revolutionerande teknik där man gjuter in plastbollar ibetongen tillsammans med armeringen. Arbetstiden samt torktiden kortas ned samtidigt somvi bevarar hållfastheten och dess funktionalitet. I den här rapporten kommer vi titta närmarepå VBS teknik och jämföra det med konventionell betongplatta och se om tekniken är lämpligför att implementeras i Sverige.Vi har använt oss av en kvalitativ metod i form av källanalys från internet och tryckta källor.Även en komparativ metod i de fallen vi har hittat information från mer än en källa.Rapporten kommer enbart fokusera på betongplattor och våningsavskiljande bjälklag. VBSanvänds i horisontella plan endast. Tak och väggar är därför uteslutna. Tekniken kommerpresenteras i form av viktiga aspekter för dess överlevnad i den svenska marknaden såsomekonomi, strukturella fördelar och hållbarhet.Resultatet visar att VBS rent ekonomiskt nästan bara är positivt jämfört med denkonventionella betongplattan som endast består av armerad betong. Konstruktionsmässigt ärVBS ett konkurrenskraftigt alternativ till armerad betong. Böjhållfastheten är detsamma somarmerad betong. Andra bra positiva aspekter är miljövänligheten, arbetsmiljömässigt,energikonsumtion och värmeisolering.De mindre bra egenskaperna är sämre prestanda i skjuvmotstånd, brandmotstånd ochljudisolering.VBS kan implementeras i Sverige men för att plast ska introduceras i en så pass stor skala såbehövs en infrastruktur. Den bör tillgodose hållbart produktion av Bubbledeck och separeramaterialen vid rivning. Tekniken medför stora fördelar men trots det kan företagen få svårt attmotivera sig till att bygga med VBS när betong är så lättillgängligt och varit med så länge.
Concrete is today one of the materials we use most in the construction industry and it has itsconsequences. More than 50% of the energy emissions from the construction site come fromcement production. Voided biaxial slab or VBS is a revolutionary technique in which plasticballs are cast into the concrete together with the reinforcement. The working time and thedrying time are reduced while maintaining the strength and its functionality. In this report, wewill take a closer look at VBS technology and compare it with conventional concrete slab andsee if the technology is suitable for implementation in Sweden.We have used a qualitative method in the form of source analysis from the Internet andprinted sources. Also a comparative method in cases where we have found information frommore than one source.The report will focus solely on concrete slabs and floor separating flooring. VBS is used inhorizontal planes only. Roofs and walls are therefore excluded. The technology will bepresented in the form of important aspects for its survival in the Swedish market such aseconomy, structural benefits and sustainability.The result shows that VBS is financially almost only positive compared to the conventionalconcrete slab, which consists only of reinforced concrete. In terms of design, VBS is acompetitive alternative to reinforced concrete. The flexural strength is the same as reinforcedconcrete. Other good positive aspects are environmental friendliness, work environment,energy consumption and heat insulation.The less good features are poor performance in shear resistance, fire resistance and soundinsulation.VBS can be implemented in Sweden but for plastic to be introduced on such a large scale, aninfrastructure is needed. It should meet the sustainable production of Bubbledeck and separatethe materials during demolition. The technology brings great benefits, but despite this,companies can find it difficult to motivate them to build with VBS when concrete is so easilyaccessible and has been around for so long.
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Cuenca, Asensio Estefanía. "ON SHEAR BEHAVIOR OF STRUCTURAL ELEMENTS MADE OF STEEL FIBER REINFORCED CONCRETE." Doctoral thesis, Universitat Politècnica de València, 2013. http://hdl.handle.net/10251/18326.

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Cuenca Asensio, E. (2012). ON SHEAR BEHAVIOR OF STRUCTURAL ELEMENTS MADE OF STEEL FIBER REINFORCED CONCRETE [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/18326
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Paiva, Mariana Acioli do Carmo. "Análise das propriedades mecânicas nas primeiras idades do concreto de lajes alveolares utilizando o ensaio de ultrassom." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-08122017-102900/.

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Ensaios não destrutivos são testes que não causam danos a estrutura ensaiada, o que os torna um excelente auxílio aos métodos de ensaios tradicionais quando estes apresentam alguma dificuldade de serem executados. Desta forma, este trabalho visa utilizar os ensaios de esclerometria e ultrassom, dando ênfase na transmissão indireta, para determinar a resistência à compressão nas primeiras idades do concreto e possibilitar um melhor controle tecnológico do material. Para se obter a relação entre os dados experimentais não destrutivos e a resistência à compressão, foram realizados ensaios em duas etapas. A primeira etapa foi desenvolvida em corpos de prova cilíndricos e prismáticos com três traços diferentes de concreto, onde foi variado o consumo de cimento. Na segunda etapa os ensaios foram realizados em uma laje alveolar produzida em laboratório. Com os dados coletados nos ensaios foi possível determinar a relação de crescimento da resistência, do índice esclerométrico e da velocidade do pulso ultrassônico ao longo do tempo, além das correlações velocidade x resistência, velocidade x índice esclerométrico; e a correlação múltipla entre os três fatores. Com base nisto, concluiu-se que é viável ter um bom controle tecnológico da resistência do concreto a partir dos ensaios não destrutivos. Este trabalho não obteve uma equação universal que correlacionasse os parâmetros para todos os tipos de traço de concreto, porém foram obtidas correlações satisfatórias para os traços ensaiados. Desta forma, é possível afirmar que o ensaio de ultrassom, especificamente posição indireta de 30 centímetros, e a esclerometria são ferramentas possíveis de serem aplicadas como auxílio à obtenção da resistência à compressão nas primeiras idades.
Non-destructive tests are tools that do not cause damage to the evaluated structure, which is an excellent support for traditional test methods. Therefore, this work used non-destructive tests such as rebound method and ultrasound, emphasizing the indirect transmission, to determine compression strength in the early age sand enable a better technological control of the material. Two-step tests were performed to see if there is a relationship between non-destructive test data and the compressive strength. The first one was performed in specimens with three different concrete compositions, where the cement ratio was varied, where as the second was carried out in a laboratory hollow core slab. With the experimental data was possible to determine the relationship of the compression strength, rebound number and ultrasonic pulse velocity over time; as the correlations strength x velocity, velocity x rebound number; and a multiple correlation between the three tests. Based on this, it was concluded that it is possible to have a good technological control of the concrete strength from non-destructive tests. A universal equation that correlates parameters for all types of concrete compositions was not found, but satisfactory correlations were obtained for the tested concretes. In this way, it is possible to affirm that the ultrasound test, specifically indirect position of 30 centimeters, and rebound method are possible tools to be applied as aid to obtain the compression strength in the early ages.
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Pinheiro, Gregory Lee. "Estudo da influência do preenchimento de alvéolos em lajes alveolares submetidas à força cortante." Universidade Federal de São Carlos, 2014. https://repositorio.ufscar.br/handle/ufscar/4696.

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The use of precast elements has become crescent in Brazil, due to the need of haste during production as well as while assembling the structures. Bearing in mind a quick assembly and the competitive price for this kind of frame, precast elements have been growing and spreading in this field throughout the country. There is something special about demanding hollow core slabs, in virtue of their own low weight, in face of the empty spaces generated by the hollows and a better use of materials because of pretension technique, making it economically feasible. The National Technical Code ABNT NBR 9062, which deals with precast concrete structures, shows no more specific criteria as far as hollow core slabs are concerned, but on the other hand the 2011 review in force to ABNT NBR 14861 which covers precast hollow core slabs brings about relevant aspects such as the method used to check the capacity of shear strength on precast hollow core slabs, both with and without concrete structural cover, and furthermore with and without hollow fillings. Considering the reduced amount of national research on this topic, this study aims to develop and perform techniques in different ways of filling the hollows and the slabs and how they behave when exposed to shear strength tests. As a consequence to the manufacturing process of such type of slab and the hollow- filling method, failure in the idealized filling, in virtue of each material own behavior and inappropriate technique are commonly found.
O emprego de elementos pré-fabricados tem se tornado crescente no Brasil, dado a necessidade de velocidade de produção e montagem de estruturas. Tendo em vista a rápida montagem e o preço competitivo deste tipo de estrutura, elementos prémoldados tem ganhado campo no mercado nacional. Há um destaque pela procura de lajes alveolares, devido ao seu baixo peso próprio, decorrente de vazios proporcionados pelos alvéolos e maior otimização dos materiais em virtude da aplicação da técnica de pré-tração, tornando-a economicamente viável. A Norma Técnica Nacional ABNT NBR 9062 que trata de estruturas pré-moldadas de concreto não apresenta critérios mais específicos para lajes alveolares, por outro lado a revisão em vigor de 2011 da ABNT NBR 14861 que aborda lajes alveolares préfabricadas traz aspectos relevantes tais como o método de verificação da resistência à força cortante de lajes alveolares com ou sem capeamento estrutural e com ou sem preenchimento de alvéolos. Tendo em vista o reduzido volume de pesquisas nacionais sobre o tema, esta pesquisa tem como objetivo fazer um estudo teórico-experimental das diferentes técnicas de preenchimento de alvéolos de lajes alveolares e o seu comportamento quando submetidas a ensaios de força cortante. Como consequência do processo de fabricação deste tipo de laje e do método de preenchimento dos alvéolos, falhas no preenchimento idealizado devido ao comportamento distinto dos materiais e técnicas inadequadas são comumente constatadas.
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Camillo, Carolina Alvares. "Continuidade de painéis de laje alveolar em edifícios." Universidade Federal de São Carlos, 2012. https://repositorio.ufscar.br/handle/ufscar/4679.

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The floors consist of hollow core slabs are being increasingly used in Brazil, because it can overcome large spans, have a low self-weight, allow fast assembly, require no shoring in many situations and are more economical than other solutions. These floors are normally designed for ease of implementation, so that the slabs act as simply supported, without continuity. This work presents a roadmap of calculation and verification based on known theoretical models and tests already carried out considering that the hollow core slabs of pavement work as continuous. This continuity is made by adding passive reinforcement in the topping region. The calculation procedures are also detailed for the situations in which there are alternate accidental actions, as well as the situation in which there are concentrated mobile loads acting on the floor. Numerical examples comparative considering continuity with the situation simply supported show what can be achieved: the active reinforcement economy, increasing the value of accidental load and checks excessive deformation that is not checked on a system simply supported. Some situations are also pointed in which the consideration of continuity fails to bring great advantage. In all the examples developed are shown the details required to perform continuity. Every calculation methodology is based on Brazilian codes and should be noted that the calculations are done considering the simultaneous loss of prestressing. At the end of the work are proposed studies that may be performed to improve understanding of the behavior of pavements with continuous hollow core slabs.
Os pavimentos formados por laje alveolar estão sendo cada vez mais utilizados no Brasil, porque podem vencer grandes vãos, ter um baixo peso próprio, permitirem rapidez de montagem, não necessitam de escoramento e em diversas situações são mais econômicos do que outras soluções. Tais pavimentos são normalmente projetados, por facilidade de execução, para que as lajes funcionem como simplesmente apoiadas, sem continuidade. Apresenta-se neste trabalho um roteiro de cálculo e verificações baseados em modelos teóricos conhecidos e ensaios já realizados considerando que as lajes alveolares do pavimento funcionam como contínuas. Esta continuidade é feita através da adição de armadura passiva na capa das lajes. Detalham-se os procedimentos de cálculo também para as situações em que existem ações acidentais alternadas, assim como para a situação em que há cargas concentradas móveis atuantes no pavimento. Exemplos numéricos comparativos considerando a continuidade com a situação simplesmente apoiada mostram, que é possível alcançar: economia na armadura longitudinal ativa, aumento do valor de carga acidental atuante e atender verificações de deformação excessiva, não atendidas em um sistema simplesmente apoiado. Aponta-se também em quais situações a consideração da continuidade não chega a trazer grande vantagem. Em todos os exemplos desenvolvidos são mostrados os detalhes necessários para executar a continuidade. Toda a metodologia de cálculo é baseada nas instruções das normas Brasileiras e salienta-se que os cálculos são feitos considerando-se as perdas de protensão simultâneas. No final do trabalho são propostos estudos que podem ser realizados para melhorar o entendimento do comportamento de pavimentos contínuos com lajes alveolares.
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Books on the topic "Hollow concrete slab"

1

Pajari, Matti. Shear resistance of prestressed hollow core slabs on flexible supports. Espoo, Finland: Technical Research Centre of Finland, 1995.

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Buettner, Donald R. PCI manual for the design of hollow core slabs. 2nd ed. Chicago, Ill: Prestressed Concrete Institute, 1998.

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Buettner, Donald R. PCI manual for the design of hollow core slabs. Chicago, Ill: Prestressed Concrete Institute, 1985.

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Mazzone, Graziano. The shear response of precast, pretensioned hollow-core concrete slabs. Ottawa: National Library of Canada, 1996.

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Parker, Philip M. The 2007-2012 World Outlook for Prestressed Concrete Solid and Hollow Cored Slabs and Panels. ICON Group International, Inc., 2006.

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The 2006-2011 World Outlook for Prestressed Concrete Solid and Hollow Cored Slabs and Panels. Icon Group International, Inc., 2005.

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Parker, Philip M. The 2007-2012 Outlook for Prestressed Concrete Solid and Hollow Cored Slabs and Panels in India. ICON Group International, Inc., 2006.

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Parker, Philip M. The 2007-2012 Outlook for Prestressed Concrete Solid and Hollow Cored Slabs and Panels in Japan. ICON Group International, Inc., 2006.

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Parker, Philip M. The 2007-2012 Outlook for Prestressed Concrete Solid and Hollow Cored Slabs and Panels in Greater China. ICON Group International, Inc., 2006.

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Parker, Philip M. The 2007-2012 Outlook for Prestressed Concrete Solid and Hollow Cored Slabs and Panels in the United States. ICON Group International, Inc., 2006.

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Book chapters on the topic "Hollow concrete slab"

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Mehandiratta, Mayank, and Praveen Kumar. "Behaviour of Hollow Core Concrete Slabs." In Algorithms for Intelligent Systems, 357–62. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-6707-0_34.

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Cuenca, Estefanía. "Experimental Tests on Hollow Core Slabs Made with FRC." In On Shear Behavior of Structural Elements Made of Steel Fiber Reinforced Concrete, 125–46. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-13686-8_7.

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Vítek, Jan L., Štěpán Kohoutek, David Čítek, and Robert Coufal. "Experimental Investigation of Hollow Core Slabs Made of UHPC – Fibres Orientation." In High Tech Concrete: Where Technology and Engineering Meet, 2415–22. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-59471-2_275.

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Friedrich, Thomas, and Ronald Klein-Holte. "Flexurally Rigid Support of Prestressed Hollow Core Slabs with Post-tensioned Beams." In High Tech Concrete: Where Technology and Engineering Meet, 1137–46. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-59471-2_132.

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Nguyen, Hang T. N., Kang Hai Tan, and Tetsushi Kanda. "Experimental and Numerical Studies on Shear Behavior of Deep Prestressed Concrete Hollow Core Slabs." In High Tech Concrete: Where Technology and Engineering Meet, 1110–18. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-59471-2_129.

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"Quality assurance of hollow-core slab floors." In Quality Control of Concrete Structures, 135–44. CRC Press, 1991. http://dx.doi.org/10.1201/9781482288902-19.

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"Hollow-Core Slabs." In Tailor Made Concrete Structures, 148. CRC Press, 2008. http://dx.doi.org/10.1201/9781439828410-33.

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Wang, S. C., C. S. Wang, Q. Wang, and X. F. Tian. "Full-scale experimental validation of the steel plate- prestressed concrete composite method for the strengthening of hollow slab girders." In Life-Cycle Civil Engineering: Innovation, Theory and Practice, 924–30. CRC Press, 2021. http://dx.doi.org/10.1201/9780429343292-122.

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"RIBBED SLABS (SOLID OR HOLLOW BLOCKS OR VOIDS)." In Reinforced Concrete Design to BS 8110 Simply Explained, 149–56. CRC Press, 2002. http://dx.doi.org/10.1201/9781482288865-18.

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"Quality assurance for precast hollow core floor slabs in practice." In Quality Control of Concrete Structures, 129–34. CRC Press, 1991. http://dx.doi.org/10.1201/9781482288902-18.

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Conference papers on the topic "Hollow concrete slab"

1

Wang, Y. Z., Y. Y. Sun, L. N. Wang, and Y. Chen. "Punching Shear Behavior of Reinforced Concrete Hollow Slab." In 11th Biennial ASCE Aerospace Division International Conference on Engineering, Science, Construction, and Operations in Challenging Environments. Reston, VA: American Society of Civil Engineers, 2008. http://dx.doi.org/10.1061/40988(323)62.

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Zhao, Shunbo, Jihao Chen, and Wei He. "Dynamic Analysis and Monitoring of Prestressed Concrete Hollow Slab Bridge." In GeoHunan International Conference 2011. Reston, VA: American Society of Civil Engineers, 2011. http://dx.doi.org/10.1061/47625(404)7.

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Aimin, Yuan, Bohai Ji, and Hang Dai. "Countermeasure for the Typical Disease of Prestressed Concrete Hollow Slab Girder." In GeoHunan International Conference 2011. Reston, VA: American Society of Civil Engineers, 2011. http://dx.doi.org/10.1061/47625(404)20.

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Wang, Fu Ming, Sheng Zhen Kang, Ying Chun Cai, and Xiao Long Li. "Destructive Test Study of a Prestressed Concrete Hollow Slab Beam Bridge." In GeoHunan International Conference 2011. Reston, VA: American Society of Civil Engineers, 2011. http://dx.doi.org/10.1061/47625(404)8.

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Meyer, Patrick, Peter Schaumann, Martin Mensinger, and Suet Kwan Koh. "Experimental investigations on the load bearing behaviour of an innovative prestressed composite floor system in fire." In 12th international conference on ‘Advances in Steel-Concrete Composite Structures’ - ASCCS 2018. Valencia: Universitat Politècnica València, 2018. http://dx.doi.org/10.4995/asccs2018.2018.7020.

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In Germany, regulations for hollow spaces in slab systems require 30 minutes standard fire resistance of the load-bearing steel construction. Within a current national research project a natural fire scenario for the hollow space was developed based on realistic fire loads and ventilation conditions in the hollow space. Assuming this realistic fire scenario in the hollow space, two large scale tests on an innovative composite floor system were performed to evaluate the influence on the load bearing behaviour of the floor system. The integrated and sustainable composite floor system consists of a prestressed concrete slab, an unprotected, bisected hot rolled I-profile with composite dowels either in puzzle or clothoidal shape, and removable floor panels on the top of the I-profile. This floor system ensures the opportunity to adjust the technical building installations in accordance with the use of the building. This integrated and sustainable composite floor system was developed in several research projects. The standard fire resistance R90 for the fire scenario below the slab system has already been proven successfully. In this paper, experimental investigations regarding the heating and load bearing behaviour of the innovative composite floor system under the newly developed natural fire scenario of hollow spaces are presented. In doing so, the special test set-up to realise the fire tests for the fire scenario hollow space will be described in detail. After the fire scenario for the hollow space, the specimen was subjected to the ISO standard fire curve to establish the failure temperature of the unprotected I-profile. In addition to the temperature development and the load bearing behaviour inside the innovative floor during the heating phase, the cooling phase and the influence of a web opening on the load bearing behaviour will be discussed.
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Lei Zixue, Sun Wenzhi, Wu Xiaoguang, and Li Haiguang. "Flexural destructive field testing of a prestressed concrete wide hollow slab girder." In 2011 International Conference on Electric Technology and Civil Engineering (ICETCE). IEEE, 2011. http://dx.doi.org/10.1109/icetce.2011.5774651.

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Liu, Hongyu, and Ye Feng. "The Plasticity Analysis of the Cast-in-Situ Prestressed Concrete Hollow Slab." In 2013 Fourth International Conference on Digital Manufacturing & Automation (ICDMA). IEEE, 2013. http://dx.doi.org/10.1109/icdma.2013.358.

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He, Wei, Rong He, and Shunbo Zhao. "Analysis of Integral Loading Properties of Assembled Prestressed Concrete Hollow Slab Bridge Affected by Hinge Concrete." In GeoHunan International Conference 2011. Reston, VA: American Society of Civil Engineers, 2011. http://dx.doi.org/10.1061/47630(409)19.

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Cheng Lu, Chen Xiaoqiang, Jia Bin, Yuan Li, and Yao Huachuan. "Notice of Retraction: Experimental study on prestressed concrete hollow slab reinforced with CFRP." In 2011 International Conference on Electric Technology and Civil Engineering (ICETCE). IEEE, 2011. http://dx.doi.org/10.1109/icetce.2011.5774324.

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Oukaili, Nazar, and Hammad Merie. "On the Advantages in Sustainability of Structural Concrete Bubbled Deck Slabs." In IABSE Symposium, Guimarães 2019: Towards a Resilient Built Environment Risk and Asset Management. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2019. http://dx.doi.org/10.2749/guimaraes.2019.1173.

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<p>One of the significant methods, which reduce environmental damage, is by using the sustainable elements into construction activities. Bubbled deck is a slab system in which the ineffective concrete in the centre of the section is replaced by HDPE hollow spheres which are produced from waste plastic materials. It offers sustainable structural system due to decreasing (35%) of the self- weight and, therefore, the use and transport of less construction materials. In this study an investigation was carried out on (33) bubbled deck slabs of different dimensions and different sphere diameters, where part of specimens was with openings. The main objective of the study is to determine the impact parameters on increasing the sustainability effect through the input raw materials, energy consumption, and CO2 emissions for the bubbled deck slabs in comparison to solid slabs. Results of the study showed that the reduction of raw materials for bubbled deck slabs led to reduce the energy consumption and CO2 emission by (12%-40%).</p>
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Reports on the topic "Hollow concrete slab"

1

McDermott, Matthew R. Shear Capacity of Hollow-Core Slabs with Concrete Filled Cores. Precast/Prestressed Concrete Institute, 2018. http://dx.doi.org/10.15554/pci.rr.comp-002.

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SEISMIC BEHAVIOR OF BIAXIAL HOLLOW REINFORCED CONCRETE SLAB TO CONCRETE-FILLED STEEL TUBULAR COLUMN CONNECTIONS. The Hong Kong Institute of Steel Construction, September 2020. http://dx.doi.org/10.18057/ijasc.2020.16.3.4.

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