Dissertations / Theses on the topic 'Geopolymer concrete'
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Lo, Xin Yin. "Analysis and reproduction of geopolymer concrete." Thesis, Massachusetts Institute of Technology, 2020. https://hdl.handle.net/1721.1/127289.
Full textCataloged from the official PDF of thesis.
Includes bibliographical references (page 36).
Geopolymers are inorganic polymers based on aluminosilicates that are produced from synthesizing pozzolanic compounds or aluminosilicate source materials with highly alkaline solutions. Geopolymer concrete is a stronger, more durable and more environmentally friendly alternative to ordinary Portland cement (OPC) concrete. Based on Joseph Davidovits' recipe for geopolymer concrete, we varied the ratios of the materials in an attempt to produce the ideal formula for the concrete that withstands maximum compressive strength. Through our iterations, we found the optimum texture was produced when the amount of sodium carbonate and lime are proportionally increased relative to the rest of the materials.
by Xin Yin Lo.
M. Eng.
M.Eng. Massachusetts Institute of Technology, Department of Civil and Environmental Engineering
Matenda, Amanda Zaina. "GEOPOLYMER CONCRETE PRODUCTION USING COAL ASH." OpenSIUC, 2015. https://opensiuc.lib.siu.edu/theses/1654.
Full textHardjito, Djwantoro. "Studies of fly ash-based geopolymer concrete." Thesis, Curtin University, 2005. http://hdl.handle.net/20.500.11937/634.
Full textHardjito, Djwantoro. "Studies of fly ash-based geopolymer concrete." Curtin University of Technology, Dept. of Civil Engineering, 2005. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=18580.
Full textNapthalene-based superplasticiser was found to be ii useful to improve the workability of fresh fly ash-based geopolymer concrete, as well as the addition of extra water. The main parameters affecting the compressive strength of hardened fly ash-based geopolymer concrete are the curing temperature and curing time, the molar H2O-to-Na2O ratio, and mixing time. Fresh fly ash-based geopolymer concrete has been able to remain workable up to at least 120 minutes without any sign of setting and without any degradation in the compressive strength. Providing a rest period for fresh concrete after casting before the start of curing up to five days increased the compressive strength of hardened concrete. The elastic properties of hardened fly ash-based geopolymer concrete, i,e. the modulus of elasticity, the Poisson’s ratio, and the indirect tensile strength, are similar to those of ordinary Portland cement concrete. The stress-strain relations of fly ash-based geopolymer concrete fit well with the expression developed for ordinary Portland cement concrete.
Deb, Partha Sarathi. "Durability of fly ash based geopolymer concrete." Thesis, Curtin University, 2013. http://hdl.handle.net/20.500.11937/2126.
Full textNeupane, Kamal. "Investigation of Structural Behaviour of Geopolymer Prestressed Concrete Beam." Thesis, The University of Sydney, 2020. https://hdl.handle.net/2123/24951.
Full textChang, Ee Hui. "Shear and bond behaviour of reinforced fly ash-based geopolymer concrete beams." Thesis, Curtin University, 2009. http://hdl.handle.net/20.500.11937/468.
Full textAlanazi, Hani Mohammed. "Explore Accelerated PCC Pavement Repairs Using Metakaolin-Based Geopolymer Concrete." Thesis, North Dakota State University, 2015. https://hdl.handle.net/10365/27633.
Full textPaija, Navin. "FEASIBILITY STUDY OF USING GROUND BOTTOM ASH IN GEOPOLYMER CONCRETE." OpenSIUC, 2017. https://opensiuc.lib.siu.edu/theses/2134.
Full textRahman, Muhammad Motiur. "Geopolymer concrete columns subjected to axial load and biaxial bending." Thesis, Curtin University, 2013. http://hdl.handle.net/20.500.11937/1410.
Full textDeb, Partha Sarathi. "Properties of Geopolymer Concrete Using Ultrafine Fly Ash and Nanosilica." Thesis, Curtin University, 2018. http://hdl.handle.net/20.500.11937/75529.
Full textKarmokar, Trijon R. "Tensile performance of cast-in headed anchors in geopolymer concrete." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2023. https://ro.ecu.edu.au/theses/2657.
Full textChang, Ee Hui. "Shear and bond behaviour of reinforced fly ash-based geopolymer concrete beams." Curtin University of Technology, Department of Civil Engineering, 2009. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=120482.
Full textResearch on the development, manufacture, behaviour and applications of low calcium fly ash-based geopolymer concrete has been carried out at Curtin University of Technology since 2001. Past studies of the structural behaviour of reinforced fly ash-based geopolymer concrete members have covered the flexural behaviour of members. Further studies are needed to investigate other aspects of the structural behaviour of geopolymer concrete. Design for both shear and bond are important in reinforced concrete structures. Adequate shear resistance in reinforced concrete members is essential to prevent shear failures which are brittle in nature. The performance of reinforced concrete structures depends on sufficient bond between concrete and reinforcing steel. The present research therefore focuses on the shear and bond behaviour of reinforced low calcium fly ash-based geopolymer concrete beams.
For the study of shear behaviour of geopolymer concrete beams, a total of nine beam specimens were cast. The beams were 200 mm x 300 mm in cross section with an effective length of 1680 mm. The longitudinal tensile reinforcement ratios were 1.74%, 2.32% and 3.14%. The behaviour of reinforced geopolymer concrete beams failing in shear, including the failure modes and crack patterns, were found to be similar to those observed in reinforced Portland cement concrete beams. Good correlation of test-to-prediction value was obtained using VecTor2 Program incorporating the Disturbed Stress Field Model proposed by Vecchio (2000). An average test-to-prediction ratio of 1.08 and a coefficient of variation of 8.3% were obtained using this model. It was also found that the methods of calculations, including code provisions, used in the case of reinforced Portland cement concrete beams are applicable for predicting the shear strength of reinforced geopolymer concrete beams.
For the study of bond behaviour of geopolymer concrete beams, the experimental program included manufacturing and testing twelve tensile lap-spliced beam specimens. No transverse reinforcement was provided in the splice region. The beams were 200 mm wide, 300 mm deep and 2500 mm long. The effect of concrete cover, bar diameter, splice length and concrete compressive strength on bond strength were studied. The failure mode and crack patterns observed for reinforced geopolymer concrete beams were similar to those reported in the literature for reinforced Portland cement beams. The bond strength of geopolymer concrete was observed to be closely related to the tensile strength of geopolymer concrete. Good correlation of test bond strength with predictions from the analytical model proposed by Canbay and Frosch (2005) were obtained when using the actual tensile strength of geopolymer concrete. The average ratio of test bond strength to predicted bond strength was 1.0 with a coefficient of variation of 15.21%. It was found that the design provision and analytical models used for predicting bond strength of lapsplices in reinforced Portland cement concrete are applicable to reinforced geopolymer concrete beams.
Suwan, Teewara. "Development of self-cured geopolymer cement." Thesis, Brunel University, 2016. http://bura.brunel.ac.uk/handle/2438/12975.
Full textShadnia, Rasoul, and Rasoul Shadnia. "Green Geopolymer with Incorporated PCM for Energy Saving in Buildings." Diss., The University of Arizona, 2016. http://hdl.handle.net/10150/622931.
Full textSoltaninaveh, Kaveh. "The properties of geopolymer concrete incorporating red sand as fine aggregate." Thesis, Curtin University, 2008. http://hdl.handle.net/20.500.11937/2481.
Full textRyno, Barnard. "Mechanical properties of fly ash/slag based geopolymer concrete with the addition of macro fibres." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/95866.
Full textENGLISH ABSTRACT: Geopolymer concrete is an alternative construction material that has comparable mechanical properties to that of ordinary Portland cement concrete, consisting of an aluminosilicate and an alkali solution. Fly ash based geopolymer concrete hardens through a process called geopolymerisation. This hardening process requires heat activation of temperatures above ambient. Thus, fly ash based geopolymer concrete will be an inadequate construction material for in-situ casting, as heat curing will be uneconomical. The study investigated fly ash/slag based geopolymer concrete. When slag is added to the matrix, curing at ambient temperatures is possible due to calcium silicate hydrates that form in conjunction with the geopolymeric gel. The main goal of the study is to obtain a better understanding of the mechanical properties of geopolymer concrete, cured at ambient temperatures. A significant number of mix variations were carried out to investigate the influence that the various parameters, present in the matrix, have on the compressive strength of fly ash/slag based geopolymer concrete. Promising results were found, as strengths as high as 72 MPa were obtained. The sodium hydroxide solution, the slag content and the amount of additional water in the matrix had the biggest influence on the compressive strength of the fly ash/slag based geopolymer concrete. The modulus of the elasticity of fly ash/slag based geopolymer concrete did not yield promising results as the majority of the specimens, regardless of the compressive strength, yielded a stiffness of less than 20 GPa. This is problematic from a structural point of view as this will result in large deflections of elements. The sodium hydroxide solution had the most significant influence on the elastic modulus of the geopolymer concrete. Steel and polypropylene fibres were added to a high- and low strength geopolymer concrete matrix to investigate the ductility improvement. The limit of proportionality mainly depended on the compressive strength of the geopolymer concrete, while the amount of fibres increased the energy absorption of the concrete. A similar strength OPC concrete mix was compared to the low strength geopolymer concrete and it was found that the OPC concrete specimen yielded slightly better flexural behaviour. Fibre pull-out tests were also conducted to investigate the fibre-matrix interface. From the knowledge gained during this study, it can be concluded that the use of fly ash/slag based geopolymer concrete, as an alternative binder material, is still some time away as there are many complications that need to be dealt with, especially the low modulus of elasticity. However, fly ash/slag based geopolymer concrete does have potential if these complications can be addressed.
AFRIKAANSE OPSOMMING: Geopolimeerbeton is ‘n alternatiewe konstruksiemateriaal wat vergelykbare meganiese eienskappe met beton waar OPC die binder is, en wat bestaan uit ‘n aluminosilikaat en ‘n alkaliese oplossing. Vliegas-gebaseerde geopolimeerbeton verhard tydens ‘n proses wat geopolimerisasie genoem word. Hierdie verhardingsproses benodig hitte-aktivering van temperature hoër as dié van die onmiddellike omgewing. Gevolglik sal vliegas-gebaseerde geopolimeerbeton ‘n ontoereikende konstruksiemateriaal vir in situ gietvorming wees, aangesien hitte-nabehandeling onekonomies sal wees. Die studie het vliegas/slagmentgebaseerde geopolimeerbeton ondersoek. Wanneer slagment by die bindmiddel gevoeg word, is nabehandeling by omliggende temperature moontlik as gevolg van kalsiumsilikaathidroksiede wat in verbinding met die geopolimeriese jel vorm. Die hoofdoel van die studie was om ‘n beter begrip te kry van die meganiese eienskappe van geopolimeerbeton, wat nabehandeling by omliggende temperature ontvang het. ‘n Aansienlike aantal meng variasies is uitgevoer om die invloed te ondersoek wat die verskeie parameters, aanwesig in die bindmiddel, op die druksterkte van die vliegas/slagmentgebaseerde geopolimeerbeton het. Belowende resultate is verkry en sterktes van tot so hoog as 72 MPa is opgelewer. Daar is gevind dat die sodiumhidroksiedoplossing, die slagmentinhoud en die hoeveelheid water in die bindmiddel die grootste invloed op die druksterkte van die vliegas/slagmentgebaseerde geopolimeerbeton gehad het. Die styfheid van die vliegas/slagmentgebaseerde geopolimeerbeton het nie belowende resultate opgelewer nie. Die meeste van die monsters, ongeag die druksterkte, het ‘n styfheid van minder as 20 GPa opgelewer. Vanuit ‘n strukturele oogpunt is dit problematies, omdat groot defleksies in elemente sal voorkom. Die sodiumhidroksiedoplossing het die grootste invloed op die styfheid van die vliegas/slagmentgebaseerde geopolimeerbeton gehad. Staal en polipropileenvesels is by ‘n hoë en lae sterke geopolimeer beton gevoeg om die buigbaarheid te ondersoek. Die die maksimum buigbaarheid het hoofsaaklik afgehang van die beton se druksterkte terwyl die hoeveelheid vesels die beton se energie-opname verhoog het. ‘n OPC beton mengsel van soortgelyke sterkte is vergelyk met die lae sterkte geopolimeerbeton en daar is gevind dat die OPC beton ietwat beter buigbaarheid opgelewer het. Veseluittrektoetse is uitgevoer om die veselbindmiddel se skeidingsvlak te ondersoek. Daar kan tot die gevolgtrekking gekom word dat, alhoewel belowende resultate verkry is, daar steeds sommige aspekte is wat ondersoek en verbeter moet word, in besonder die styfheid, voordat geopolimeerbeton as ‘n alternatiewe bindmiddel kan optree. Volgens die kennis opgedoen tydens hierdie studie, kan dit afgelei word dat die gebruik van vliegas/slagmentgebaseerde geopolimeerbeton, as 'n alternatiewe bindmiddel, nog 'n geruime tyd weg is, as gevolg van baie komplikasies wat gehandel moet word, veral die lae elastisiteitsmodulus. Tog het vliegas/slagmentgebaseerde geopolimeerbeton potensiaal as hierdie komplikasies verbeter kan word.
Król, Maciej R. "Studies of concrete properties based on geopolymer binders : PhD thesis summary." Rozprawa doktorska, [s.n.], 2017. http://dlibra.tu.koszalin.pl/Content/1039.
Full textNath, Pradip. "Study of fly ash based geopolymer concrete cured in ambient condition." Thesis, Curtin University, 2014. http://hdl.handle.net/20.500.11937/190.
Full textOlivia, Monita. "Durability related properties of low calcium fly ash based geopolymer concrete." Thesis, Curtin University, 2011. http://hdl.handle.net/20.500.11937/506.
Full textCheema, Didar Singh. "Low calcium fly ash based geopolymer concrete: Long term durability properties." Thesis, Curtin University, 2014. http://hdl.handle.net/20.500.11937/2146.
Full textSoltaninaveh, Kaveh. "The properties of geopolymer concrete incorporating red sand as fine aggregate." Curtin University of Technology, Curtin Engineering Faculty, Department of Civil Engineering, 2008. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=115093.
Full textPrevious studies on properties of red sand have shown that it has the potential to be used in concrete as a fine aggregate. While the use of red sand in traditional concrete has been investigated by some researchers, no research has been reported regarding the use of this by-product in manufacturing geopolymer concrete. This research looks into the replacement of natural sand fine aggregates with red sand in geopolymer concrete. Initially, an extensive series of mixtures was prepared and tested. The objective of the research was to identify the salient parameters affecting the properties of geopolymer concrete when natural sand is replaced by red sand. At the next stage, attempts were made to enhance the mechanical and durability features of red sand geopolymer concrete. The final stage consisted of testing red sand geopolymer concrete to find out the various properties of this novel construction material.
Slabbert, Michael Charles. "Utilising waste products from Kwinana industries to manufacture low specification geopolymer concrete." Thesis, Curtin University, 2008. http://hdl.handle.net/20.500.11937/606.
Full textSlabbert, Michael Charles. "Utilising waste products from Kwinana industries to manufacture low specification geopolymer concrete." Curtin University of Technology, Department of Civil Engineering, 2008. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=117996.
Full textTo find the right mix design proved challenging as these masonry products generally require a mix to have zero slump. It was decided to test across all the known and analysed water to geopolymer solids ratios for each of the mixes and establish the best mix based on compressive strength, workability and slump A known mix design based on research into low calcium Class F geopolymer concrete, developed at Curtin University using natural aggregates, was applied to these selected recycled waste mix designs. The benefit was to be able to compare the results of this research to a known result. Flash setting, an unknown phenomenon in geopolymer concrete, did occur in the low water mixes, but in spite of this, geopolymer concrete was successfully manufactured. The compressive strengths were substantially lower than those of the design mix and more research is required in this regard, however an indirect relationship was observed between the amount of bottom ash and the compressive strength. The high degree of LOI (loss of ignition) in both ashes, porosity of recycled aggregates, angularity, degree of fineness of the fines and flash setting are all possible factors influencing the properties of the geopolymer concrete. More research is recommended in a number of these areas to be able to understand and develop this technology further in order to make this a practical and robust technology in the quest to find solutions to our warming planet and our changing climate.
Williams, Franklin. "The formation of geopolymer concrete from bauxite-refining residue and fly ash: Application in sustainable concrete production." Thesis, Williams, Franklin (2021) The formation of geopolymer concrete from bauxite-refining residue and fly ash: Application in sustainable concrete production. Honours thesis, Murdoch University, 2021. https://researchrepository.murdoch.edu.au/id/eprint/63765/.
Full textBondar, Dali. "Alkali activation of Iranian natural pozzolans for producing geopolymer cement and concrete." Thesis, University of Sheffield, 2009. http://etheses.whiterose.ac.uk/14553/.
Full textGildenhuys, Hendrik. "Pioneering a new approach to sustainable concrete in Western Australia: Geopolymer concrete from fly-ash with recycled aggregates." Thesis, Gildenhuys, Hendrik (2020) Pioneering a new approach to sustainable concrete in Western Australia: Geopolymer concrete from fly-ash with recycled aggregates. Honours thesis, Murdoch University, 2020. https://researchrepository.murdoch.edu.au/id/eprint/59791/.
Full textAbu, Bakar Asif. "Effects of Nano Silica and Basalt Fibers on Fly Ash Based Geopolymer Concrete." Thesis, North Dakota State University, 2018. https://hdl.handle.net/10365/31729.
Full textDlamini, Mandla. "Performance of geopolymer concrete subjected to mineral acid corrosion and related to microbially-induced corrosion (MIC) of concrete in sewers." Master's thesis, Faculty of Engineering and the Built Environment, 2021. http://hdl.handle.net/11427/33644.
Full textPaudel, Shree Raj. "Pore Structure and Pore Solution in Alkali Activated Fly Ash Geopolymer Concrete and Its Effect on ASR of Aggregates with Wide Silicate Contents." Thesis, North Dakota State University, 2019. https://hdl.handle.net/10365/31687.
Full textHosan, Md Anwar. "Residual mechanical properties of steel fibre reinforced geopolymer concrete (SFRGC) after exposure to elevated temperatures." Thesis, Curtin University, 2016. http://hdl.handle.net/20.500.11937/1341.
Full textBosch, Giner Juan. "Chloride and Carbonation Induced Corrosion of Steel in Fly Ash Geopolymer Pore Solution." University of Akron / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=akron1627755030968028.
Full textRen, Xin. "Complete Recycling and Utilization of Waste Concrete Through Geopolymerization." Diss., The University of Arizona, 2015. http://hdl.handle.net/10150/577187.
Full textTran, Thanh Tung. "Structural Analysis and Design of Fibre-reinforced Ambient-cured Geopolymer Concrete Beams under Static and Dynamic Loading." Thesis, Curtin University, 2020. http://hdl.handle.net/20.500.11937/84212.
Full textAl-Majidi, Mohammed Kadhim Haloob. "Development of Fibre Reinforced Geopolymer Concrete (FRGC) cured under ambient temperature for strengthening and repair of existing structures." Thesis, University of Brighton, 2017. https://research.brighton.ac.uk/en/studentTheses/13f703df-e33a-42d7-ad73-8511390fd582.
Full textKothari, Ankit. "Effects of Fly Ash on the properties of Alkali Activated Slag Concrete." Thesis, Luleå tekniska universitet, Geoteknologi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-63534.
Full textAhmari, Saeed. "Recycling and Reuse of Wastes as Construction Material through Geopolymerization." Diss., The University of Arizona, 2012. http://hdl.handle.net/10150/223338.
Full textShearer, Christopher R. "The productive reuse of coal, biomass and co-fired fly ash." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/52298.
Full textKuranchie, Francis Atta. "Characterisation and applications of iron ore tailings in building and construction projects." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2015. https://ro.ecu.edu.au/theses/1623.
Full textFialová, Barbora. "Rehydratace alkalicky aktivované strusky po vysokoteplotním namáhání." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2016. http://www.nusl.cz/ntk/nusl-239940.
Full textLee, William K. "Solid-gel interactions in geopolymers." Connect to thesis, 2002. http://repository.unimelb.edu.au/10187/1071.
Full textGeopolymerisation is such a ‘green’ technology capable of turning both natural ‘virginal’ aluminosilicates and industrial aluminosilicate wastes, such as fly ash and blast furnace slag, into mechanically strong and chemically durable construction materials. However, the source materials for geopolymer synthesis are less reactive than Portland cement clinkers and the chemical compositions of these source materials can vary significantly. Consequently, product quality control is a major engineering challenge for the commercialisation of geopolymers.
This thesis is therefore devoted to the mechanistic understanding of the interfacial chemical interactions between a number of natural and industrial aluminosilicates and the various activating solutions, which govern the reactivity of the aluminosilicate source materials. The effects of activating solution alkalinity, soluble silicate dosage and anionic contamination on the reactivity of the aluminosilicate source materials to produce geopolymeric binders, as well as their bonding properties to natural siliceous aggregates for concrete making, are examined. In particular, a new set of novel ‘realistic’ reaction models has been developed for such purposes. These reaction models have been further utilised to develop a novel analytical procedure, which is capable of studying geopolymerisation on ‘real’ geopolymers in situ and in real time. This novel procedure is invaluable for the total understanding of geopolymerisation, which is in turn vital for effective geopolymer mix designs.
Hasnaoui, Abdelaziz. "Optimisation d'un géopolymère à base de laitier et de metakaolin pour la rélisation d'un béton de structure." Thesis, Cergy-Pontoise, 2019. http://www.theses.fr/2019CERG1019.
Full textThis work concerns the behavior of slag and metakaolin based geopolymer concrete formulated using a sodium silicate solution as activator. The first part of the study focuses on the optimization of the geopolymer cement. To achieve this objective, a reference Portland mortar and twenty-four geopolymer ones were developed by varying the Slag/Metakaolin weight ratio (25/75, 50/50, 75/25) and the molar ratio SiO2/Na2O, RM, of the alkaline solutions (RM between 1.0 and 2.0). The mortars were characterized in the fresh state (workability and setting time) as well as in the hardened state in terms of flexural and compressive strengths, modulus of elasticity and porosity. The results showed that the geopolymer binder composed of 50/50 Slag/Metakaolin with a molar ratio RM of 1.8 allows obtaining a more resistant mortar than the reference one while ensuring a good workability and an excellent stability against efflorescence.The second part of the work deals with the behavior of geopolymer concrete, synthesized with the binder optimized in the first part of the thesis. In addition, the effect of curing conditions and the influence of recycled aggregates incorporation on the performance of these concrete were evaluated. Indeed, three curing methods were chosen, 20°C and 50% RH, 20°C and 90% RH and a total immersion in water at 20°C. For recycled aggregates valorization, three volumetric substitution ratios were selected: 10, 30 and 50%. For all materials, the properties in the fresh state and the physical and mechanical properties in the hardened state were studied. As regards the influence of recycled aggregates, it has been shown that their introduction induces a decrease in compressive and tensile strengths. However, at low substitution ratios (less than 30%), acceptable rheological and mechanical performances are obtained.The obtained results show that curing in a low relative humidity leads to poor physical and mechanical performance compared to hardening at high relative humidity and total immersion in waterThe experimental results of this work as well as a considerable number of results reported in the literature allowed to evaluate the reliability of the empirical equations developed for the prediction of the mechanical properties of Portland concrete. For the prediction of the tensile strength of geopolymer concrete, the proposed equation for Portland concrete remains applicable. Nevertheless, a new equation has been proposed for the prediction of the elastic modulus
Zheng, Yong Chu. "Shrinkage behaviour of geopolymers /." Connect to thesis, 2010. http://repository.unimelb.edu.au/10187/7157.
Full textMohelská, Lucie. "Modifikace betonových prvků pro chladicí věže." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2013. http://www.nusl.cz/ntk/nusl-216998.
Full textWasserbauer, Jaromír. "Mechanické vlastnosti mikrostrukturních komponent anorganických materiálů." Doctoral thesis, Vysoké učení technické v Brně. Fakulta chemická, 2013. http://www.nusl.cz/ntk/nusl-233368.
Full textMuntingh, Yolandi. "Durability and diffusive behaviour evaluation of geopolymeric material." Thesis, Stellenbosch : University of Stellenbosch, 2006. http://hdl.handle.net/10019.1/2882.
Full textThe study presented in this thesis symbolises one of the first ever efforts to better understand and describe the durability of geopolymers used in large scale commercial applications. In terms of the construction industry, geopolymers can be seen as a value-added approach to substitute the Ordinary Portland Cement (OPC) monopoly. It is particularly the fly ash-based geopolymers that are the main attraction, due to their economic and environmental advantages, over and above the large quantities of this material that are commonly available. Despite the fact that geopolymers have been around for thousands of years, it is only now that the accumulation of research across the globe has pooled their knowledge to broadly define this material in terms of its physical and chemical composition. The development of geopolymers for construction applications remains quite new, therefore requiring insight into the durability that can be expected from these materials, consequently leading to this work. Concrete technology and -science is one of many techniques which can offer considerable insight into effective durability studies, in addition to acting as a reference for firm material comparisons. Thus, this work is based on a collection of concrete durability studies and recommendations which resulted from a broad range of investigations. Principally, this work aims to confirm the superiority of geopolymers in terms of corrosion resistance. Chloride induced corrosion has been identified as being the main cause for deterioration of OPC structures and subsequently the origin of very costly, and frequent, reconstructive requirements. Geopolymers now have the opportunity to be introduced into this monopoly due to its advanced, yet credible, chloride penetration resistance. This thesis reports the development of the experimental design, as well as the associated analyses to describe the diffusive properties exhibited by fly ash-based geopolymers. Ultimately, two independent methods showed that Chloride Diffusion Coefficients (CDC) for all of the geopolymeric formulations are significantly lower (typically 1.43 x 10-15 cm2/s) than for cement (typically 0.5 x 10-8 cm2/s) or any other concrete mixture. Furthermore, the work presented here will consider the diffusive behaviour of the geopolymer formulations in an acidic sulphate environment, presenting this material’s superior resistance not only to the sulphate ion, but more so to the acid attack. Probable geopolymer applications are now further expanded to industrial applications, due to its acid resistance along with reduced Sulphate Diffusion Coefficients (SDC). In addition, the development of a time-to-corrosion software-tool is discussed. This tool may prove to be a valuable instrument for future geopolymer durability research, as well as iv commercial users in which extended material comparisons can be made. It may even assist the formulation-tailoring process where the relevant CDC/SDC can be chosen for a specific life-expectancy, reaching far beyond the limited scope of recipes covered in this work. Finally, this thesis provides the stepping-stone in proving geopolymer durability superiority. The formulations which proved to show the best results in terms of durability and acid resistance are highlighted and valuable recommendations are made towards the selection of suitable starting materials for optimum material robustness. The findings of this work, however, can be fortified by future research and exposure.
Guimarães, Paulo Victor Campos. "Estudo da aderência de concretos ativados alcalinamente à base de cinza da casca de arroz e metacaulim /." Ilha Solteira, 2019. http://hdl.handle.net/11449/182264.
Full textResumo: A indústria do cimento Portland é responsável direta por uma carga de poluentes de significativo dano ambiental. Os Concretos Ativados Alcalinamente (CAA) são matrizes compostas por um ativador alcalino e um aglomerante alternativo. O material comumente utilizado para a ativação alcalina é o silicato de sódio, cuja fabricação também se mostra como ambientalmente nociva. O silicato de sódio, junto ao cimento Portland, podem ser dispensados, uma vez que a produção do ativador pode se dar através de um composto rico em silício (materiais pozolânicos no geral), sendo a cinza da casca de arroz (CCA) o instrumento de estudo do trabalho apresentado, e a soda cáustica como fornecedora de sódio (meio alcalino). Os concretos CAA foram definidos conforme o parâmetro ξ (CAA-ξ), que representa a relação molar entre SiO2 e Na2O, com as variações ξ = 1,2, ξ = 1,6 e ξ = 2,0, esta última representando o concreto ativado alcalinamente com maior taxa de CCA. Este trabalho tem como intuito a avaliação das propriedades mecânicas dos concretos CAA, comparando-as, em seguida, com duas tipologias de concreto com cimento Portland CPV-ARI, com distintos fatores água cimento (0,45 e 0,55). A variação na relação a/c teve como intuito a análise de duas referências com valores diferentes de fck. Os resultados demonstram que a resistência à compressão axial e diametral (sete dias de cura) para os concretos CAA se encontraram na faixa de 25 a 30 MPa, e de 1,5 a 3,5 MPA, respectivamente. Não foram observados... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: The Portland cement industry is directly responsible for a load of pollutants of significant environmental damage. Alkali-Activated Concrete (AAC) is a matrix with prior activation and alternative binder. The catalyst material commonly used for prior activation is the sodium silicate, the manufacture of which is also environmentally harmful. Sodium silicate, together with Portland cement, can also be dispensed with, since the activator can be produced through a silicon-rich compound (pozzolanic materials in general), with the rice husk ash (RHA) being the instrument of study of the work presented, and caustic soda as a supplier of sodium. The AAC concretes were defined according to the parameter ξ (AAC- ξ), which represents the molar ratio of SiO2 and Na2O, with the variations ξ = 1.2, ξ = 1.6 and ξ = 2.0, the latter representing the AAC with higher RHA rate. This work intends to evaluate the mechanical properties of AAC, comparing them to two types of concrete with ordinary Portland cement with high early resistance, with different water cement factors (0.44 and 0.55). The variation in the water/binder mass ratio was intended to analyze two references with different values of compressive strength class. The results demonstrate that the axial and diametric compression strength (seven days cure) for the AAC concretes were in the range of 25 to 30 MPa, and of 1.5 to 3.5 MPA, respectively. There were no significant gains in the transition between the ages of 7 and 28 days, and 2... (Complete abstract click electronic access below)
Mestre
Citeroni, Chiara. "Alkali-activated expanded lightweight aggregates for the production of special asphalt concretes." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.
Chiu, Wei-Ting, and 邱緯婷. "Development of FA/GGBFS Geopolymer Concrete." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/5e48n3.
Full text國立臺北科技大學
土木工程系土木與防災碩士班
106
Iron blast-furnace slag is a by-product produced by the steel plant during the iron making process, and fly ash is a major by-product of coal-fired power plants. Every year, a large amount of blast-furnace slag and fly ash produced. With great difficulty, if it is disposed of as waste, it will not only be environmentally unfriendly, but will also cost a lot of costs. If blast-furnace slag is water-quenched cooling, grinding into fine powder and adding to concrete can replace part of the cement, it is generally considered that the concrete can be made denser and the durability is increased. The same is true for fly ash, which saves cement consumption. However, in order to make fuller and more efficient use of waste resources, this study attempted to produce geopolymer based on fly ash and blast-furnace slag, it is expected to develop cement-free concrete. According to the experimental results, a slurry of fly ash and geopolymer material ratio of 1, the strength of it can be up to 253.9 kgf/cm2 in 28 days. A slurry of blast-furnace slag and geopolymer material ratio of 1 and the performance is better, the strength of it can be up to 578.2 kgf/cm2. However, when gravel was separately added to make fly ash and blast-furnace slag geopolymer concrete specimens, the 28-day strength was only 148.8 kgf/cm2 and 229.7 kgf/cm2, respectively. It is initially known that the key factors may be in the gradation of coarse aggregates and will be discussed in subsequent research.
Chen, Jing-Len, and 陳敬仁. "Preparation of Geopolymer Green Concrete and Pervious concrete by using Marble." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/y8322w.
Full text國立臺北科技大學
資源工程研究所
106
In this study, by using the cement raw material –marble and slag as the main material, mix with the alkali solution to make the marble based geopolymer green cement, concrete and pervious concrete. This research can be divided into three parts, the first part uses the marble based geopolymer to make the geopolymer green cement paste, which the result shows the setting time of green cement paste can control more than 80 mins, and the compressive strength can reach more than 70MPa after 28 days curing time. By Comparing with traditional Portland cement, green cement paste not only emits much lower carbon dioxide but also provide good mechanical strength and working ability. The results showed that the geopolymeric concrete curing in the indoor and outdoor environment for 90days the compressive strength can achieve 44MPa and 31MPa. The durability of the geopolymer concrete also shows a good performance. The result shows the geopolymeric pervious concrete compressive strength can achieve more than 11MPa, the permeability coefficient can reach more than 1.51 cm/s. The testing results of the pervious concrete all confirm the construction standards. The final part is carbon emission and cost calculated. Comparing with the Portland cement product, the cost of marble based geopolymer 10% worth than Portland cement product, but the carbon emission can reduce more than 44%. The marble based geopolymer product can provide a good performance in many practices. In future, hope this material can use in the civil engineering and achieve the goal of the carbon reduction.