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Journal articles on the topic 'Aggregate source'

Author: Grafiati

Published: 4 June 2021

Last updated: 3 February 2022

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1

Ahmad, Juraidah, Mohd Yusof Abdul Rahman, and Zainab Mohamed. "Consensus and Source Properties of Malaysian Aggregates for Superior Performing Asphalt Pavements." Scientific Research Journal 5, no. 1 (2008): 53. http://dx.doi.org/10.24191/srj.v5i1.5653.

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Aggregates and binder are the two main constituents that make up hot mix asphalt (HMA). Since a wide variety of mineral aggregate is used to produce Hot Mix Asphalt (HMA), proper evaluation of the mineral aggregate properties is important to ensure good performance of asphalt mixture. Unlike Superpave system, Marshall and Hveem method do not incorporate aggregate criteria into their procedures. The Superpave Highway Research Programme (SHRP) modified the Delphi process to include aggregate properties which are divided into two categories; consensus and source. The consensus properties include

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2

Hurley, Graham C., and Brian D. Prowell. "Refinement of the Hot-Mix Asphalt Ignition Method for High-Loss Aggregates." Transportation Research Record: Journal of the Transportation Research Board 1907, no. 1 (2005): 128–34. http://dx.doi.org/10.1177/0361198105190700115.

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Four methodologies for determining the asphalt content of mixtures containing high-loss aggregates in the ignition furnace were evaluated: the standard method using the Thermolyne furnace (control), the Troxler NTO infrared furnace, the Ontario method, and a Tempyrox glass-cleaning oven. Six aggregate sources with high ignition furnace aggregate corrections were obtained from around the country: four dolomites, a basalt, and a serpentine/chlorite. Calibration factors were determined for each method at optimum asphalt content. Additional samples were then tested at optimum plus 0.5% asphalt con

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3

Das, Bappa, Debashis Chakraborty, Vinod K. Singh, Pramila Aggarwal, Ravender Singh, and Brahm S. Dwivedi. "Effect of Organic Inputs on Strength and Stability of Soil Aggregates Under Rice-Wheat Rotation." International Agrophysics 28, no. 2 (2014): 163–68. http://dx.doi.org/10.2478/intag-2014-0004.

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Abstract The study aims to elucidate the impact of organic inputs on strength and structural stability of aggregates in a sandy loam soil. Tensile strength, friability and water stability of aggregates, and the carbon contents in bulk soil and in large macro (>2 mm), small macro (0.25-2 mm), micro (0.053-0.25 mm) and silt+clay size (<0.053) aggregates were evaluated in soils from a long-term experiment with rice-wheat rotation at Modipuram, India, with different sources and amounts of organic C inputs as partial substitution of N fertilizer. Addition of organic substrates significantly i

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Arshad, Hussain, and Yan Jun Qiu. "Evaluation of Dina Aggregates for Pavement Construction in Pakistan." Advanced Materials Research 548 (July 2012): 239–42. http://dx.doi.org/10.4028/www.scientific.net/amr.548.239.

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This paper presents the evaluation of the potential aggregate source for pavement construction in Pakistan. The Dina quarries which produce quartzite aggregates have been in use for building construction for long time. For pavement construction the aggregate materials are mostly obtain from Margalla hills and Kirana hills. The crushed limestone from Margalla source has been in use for both building and road construction from decades. The Kirana hills aggregates have been also used in many road construction projects in Punjab. The purpose of this research is to see the performance of Dina quarr

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Bangwar, D. K., A. Saand, M. A. Keerio, M. A. Soomro, and A. N. Laghari. "Replacement of Coarse Aggregate with Locally Available Brick Aggregate." Engineering, Technology & Applied Science Research 7, no. 6 (2017): 2266–67. http://dx.doi.org/10.48084/etasr.1587.

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Due to the abundant usage of concrete as a construction material, there is a fast dwindling source of aggregates. There are regions where there is scarcity of coarse aggregate, so to resolve this problem, Bricks Aggregates (BAs) can be used as coarse aggregate. A concrete mix ratio of 1:2:4 having characteristics strength of 3000 psi has been used in this experimental work. Compressive and tensile strength of concrete mix where 50% coarse aggregate is replaced with brick aggregate and concrete mix where 100% coarse aggregate is replaced with brick aggregate and addition of silica fume as a sup

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Domanskaya, Irina K., Fedor Kapustin, and Rudolf Hela. "Concrete Recycling as a Source of Polyfractional Mineral Raw Materials." Solid State Phenomena 309 (August 2020): 126–31. http://dx.doi.org/10.4028/www.scientific.net/ssp.309.126.

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The problems of concrete recycling as a complex poly-reinforced composite characterized by unstable composition and properties are discussed. The peculiarity of recycling concrete scrap is that its return to the production cycle can be carried out in the form of different products: coarse aggregate (recycled aggregate), fine aggregate (sand from crushed concrete), as well as in the form of a dust-like fraction. It is shown that aggregates made of crushed concrete are inferior to natural analogues due to the presence of cement-sand mortar in their composition. Given the growing threat of deplet

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Prajapati, Jeetendra, and Sudip Karanjit. "Effect of Coarse Aggregate Sources on the Compressive Strength of Various Grade of Nominal Mixed Concrete." Journal of Science and Engineering 7 (December 22, 2019): 52–60. http://dx.doi.org/10.3126/jsce.v7i0.26792.

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Various grades of nominal mix concrete from low to medium strength are being used in building construction works in Kathmandu Valley. The aim of the study was to investigate the source effect of various types of coarse aggregates on the compressive strength of different grade of nominal mix concrete. Here, 5 different types of coarse aggregates sources were selected (A-Panauti, B-Melamchi, C-Chaukidada, D-Khopasi and E-Kaaldhunga) based on field enquiry and questionnaire survey with suppliers and contractors. Majority of coarse aggregates were angular in shape with a few sub angular and flaky

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Chang, Xiao Lei, Song Gu, and Zhi Zheng. "Experimental Study on Recycled Concrete Coarse Aggregate Crushed Index." Applied Mechanics and Materials 584-586 (July 2014): 1750–55. http://dx.doi.org/10.4028/www.scientific.net/amm.584-586.1750.

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Compared with natural aggregate, recycled aggregate apparent density, bulk density, porosity, water absorption, large crushing index value, which corresponds to aggregate different sources have different indicators, which largely of recycled concrete limits on the application.. In order to more efficiently improve the utilization of recycled aggregate, ensure the stability production quality of recycled concrete, source unknown and difficult to directly measure its intensity of waste concrete materials, at the time of the preparation of recycled aggregate, it is recommended to repeat loading,

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9

Gerges, Najib Nicolas, Camille Amine Issa, Samer Ahmad Fawaz, Jacques Jabbour, Johnny Jreige, and Aiman Yacoub. "Recycled Glass Concrete: Coarse and Fine Aggregates." European Journal of Engineering Research and Science 3, no. 1 (2018): 1. http://dx.doi.org/10.24018/ejers.2018.3.1.533.

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Conventional concrete aggregate consists of sand (fine aggregate) and various sizes and shapes of gravel or stones (coarse aggregate). However, there is a growing interest in substituting alternative aggregate materials, largely as a potential use for recycled materials. While there is significant research on many different materials for aggregate substitutes such as granulated coal ash, blast furnace slag or various solid wastes including fiberglass waste materials, granulated plastics, paper and wood products or wastes, sintered sludge pellets and others. Recycled waste glasses were used as

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Krawczyk, Bartłomiej, and Elżbieta Stigler-Szydło. "Suitability of recycled concrete aggregate for transportation infrastructure embankments and improved subgrade." Transportation Overview - Przeglad Komunikacyjny 2018, no. 11 (2018): 72–84. http://dx.doi.org/10.35117/a_eng_18_11_08.

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The paper presents research in the field of utilizing materials recycled from concrete pavements through crushing and re-incorporating them in road embankments and improved subgrade layers. Crushed concrete rubble is an alternative source of aggregates, replacing natural aggregates. Recycled concrete aggregate was tested with regard to the current national requirements. It was proven that recycled concrete aggregate is a suitable material for incorporation into new unbound and cement-bound layers of the improved subgrade. The problem of utilization recycled concrete aggregate in road embankmen

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NISHIBATA, SAYAKA, TAKESHI WATANABE, CHIKANORI HASHIMORO, and KIYOSHI KOHNO. "EVALUATION OF FRACTURE IN CONCRETE WITH RECYCLED AGGREGATE BY ACOUSTIC EMISSION." International Journal of Modern Physics B 20, no. 25n27 (2006): 3652–57. http://dx.doi.org/10.1142/s0217979206040143.

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This research revealed fracture behavior of concrete in using recycled aggregates by Acoustic Emission as one of the Non-destructive Inspection. The phenomenon of acoustic emission (AE) is the propagation of elastic waves generated from a source, known as a micro-crack in an elastic material. There were taken to use low-treated recycled aggregate, crushed returned ready mixed concrete for aggregate and normal aggregate. Examination measured AE under the uniaxial compression test. The condition of load is repeated loading. As a result, fracture behavior due to low treated recycled aggregate was

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Komaragiri, Satyavati, Armen Amirkhanian, and Amit Bhasin. "Friction and Texture Retention of Concrete Pavements." Transportation Research Record: Journal of the Transportation Research Board 2674, no. 6 (2020): 457–65. http://dx.doi.org/10.1177/0361198120919397.

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In the late 1980s and early 1990s, the Alabama Department of Transportation (ALDOT), U.S., noticed a decline in skid trailer numbers on concrete pavements shortly after grinding operations. The engineers at the time suspected that the coarse aggregate caused the decline in these numbers and the resulting conclusion led to a ban of carbonate aggregates in mainline concrete pavement in Alabama that is still in place. This detailed laboratory study re-examines the fundamental friction issues that led to this policy. A total of 48 aggregate, grinding, and grooving combinations were tested as part

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Barreto Santos, Miguel, Jorge De Brito, and António Santos Silva. "A Review on Alkali-Silica Reaction Evolution in Recycled Aggregate Concrete." Materials 13, no. 11 (2020): 2625. http://dx.doi.org/10.3390/ma13112625.

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Alkali-silica reaction (ASR) is one of the major degradation causes of concrete. This highly deleterious reaction has aroused the attention of researchers, in order to develop methodologies for its prevention and mitigation, but despite the efforts made, there is still no efficient cure to control its expansive consequences. The incorporation of recycled aggregates in concrete raises several ASR issues, mainly due to the difficult control of the source concrete reactivity level and the lack of knowledge on ASR’s evolution in new recycled aggregate concrete. This paper reviews several research

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14

Yin, Jian, Yi Chi, and Wei Min Song. "Application of Fractal Theory on the Cement Stabilized Recycled Course Aggregate Base Material." Advanced Materials Research 639-640 (January 2013): 389–93. http://dx.doi.org/10.4028/www.scientific.net/amr.639-640.389.

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This paper studied different size-distribution of recycled coarse aggregates by fractal theory. Cement Stabilized Recycled Aggregate Mixture were prepared by different fractal rate aggregate gradations and the unconfined compressive strength at 7 d and 28 d of the materials were tested. The results showed that the unconfined compressive strength at 7 d and 28 d of the materials with recycled coarse aggregate were higher than the one with natural aggregate when coarse aggregate gradations were same. The higher source rock strength of recycled coarse aggregate was, the larger base material stren

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15

ALSuhaibani, Abdulrahman. "EFFECT OF AGGREGATE SOURCE AND GRADATION ON THE RESILIENT BEHAVIOR OF BASES AGGREGATE." ERJ. Engineering Research Journal 30, no. 2 (2007): 225–31. http://dx.doi.org/10.21608/erjm.2007.70055.

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Sebaaly, Peter E., Dan Ridolfi, Raja S. Gangavaram, and Jon A. Epps. "Selecting Most Desirable Hot-Mix Asphalt Mixtures." Transportation Research Record: Journal of the Transportation Research Board 1590, no. 1 (1997): 99–107. http://dx.doi.org/10.3141/1590-12.

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Aggregate properties and gradations have been shown to have a significant impact on the strength and performance of HMA mixtures. Strength properties, such as the resilient modulus and tensile strength, and performance properties, such as moisture sensitivity, permanent deformation, and low-temperature cracking, play a major role in the field performance of HMA mixtures. However, it is believed that by changing the aggregate gradation and the asphalt binder, a desirable hot-mix asphalt mixture can be achieved for any source of aggregate. The data and analysis of a laboratory research study tha

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Al-Fadala, Sharifa. "Sustainability of Construction Aggregates in Kuwait." Academic Research Community publication 2, no. 4 (2019): 406. http://dx.doi.org/10.21625/archive.v2i4.384.

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Kuwait is facing a current construction boom with projects worth of more than USD188bn. The huge infrastructure spending plan of Kuwait is reflected with a growing demand of concrete as concrete is the most commonly used building material in the local construction. At the present, the quarrying of coarse aggregate which is a main concrete constituent material is banned in Kuwait since 1997 and construction industry depends on the imported coarse aggregates from neighbouring sources such as United Arab Emirates and Iran. Kuwait is also interested in challenging the growing concern of an effecti

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18

Sultana, Afroja. "Impact of Multiple Recycling on the Strength of Coarse Aggregate." Civil Engineering Beyond Limits 2, no. 1 (2020): 12–15. http://dx.doi.org/10.36937/cebel.2021.001.003.

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Concrete structures are integral parts of modern civilization. Every year a huge amount of concrete waste is generated due to demolition of old concrete structures for replacing them with new high-rise buildings or other structures, which consequently, increasing the environmental loads. Recycling of demolished concrete is found to be an effective way for sustainable development which can also minimize the disposal problem associated with concrete waste. Recycling of demolished concrete to produce usable aggregate, therefore, has drawn attention of researchers in the field of concrete technolo

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Lima Filho, Marçal Rosas Florentino, Sandro Marden Torres, Leon Black, Andressa de Araújo Porto Vieira, Rodinei Medeiros Gomes, and Kelly Cristiane Gomes. "Supercritical Carbonation of Lightweight Aggregate Containing Mortar: Thermal Behavior." Key Engineering Materials 600 (March 2014): 345–56. http://dx.doi.org/10.4028/www.scientific.net/kem.600.345.

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Lightweight concrete shows good insulation properties, depending on several parameters such as mix design and aggregate type. Perlite aggregate is one of the most effective aggregates for such a purpose, mainly because of its low thermal conductivity (0.04 W/m.°C), but is not available globally. This paper explores the potential use of another source of thermal efficient aggregate, vermiculite (0.058 W/m.°C) which is available in Brazil and other countries where perlite is absent. Cylindrical samples were cast by using two lightweight aggregates, perlite and vermiculite, and treated with super

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Heeralal, M., Rathish Kumar, and Y. V. Rao. "Flexural fatigue characteristics of steel fiber reinforced recycled aggregate concrete (SFRRAC)." Facta universitatis - series: Architecture and Civil Engineering 7, no. 1 (2009): 19–33. http://dx.doi.org/10.2298/fuace0901019h.

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This research work is aimed at investigating the flexural fatigue behavior of Steel Fiber Reinforced Recycled Aggregate Concrete (SFRRAC). This study gains importance in view of the wide potential for demolished concrete to serve as a source of quality aggregate feed stock in a variety of structural and non-structural applications. This is a continuation of a series of investigations being conducted aimed at optimizing the utilization of recycled aggregate concrete in rigid pavements. A total of 72 standard flexure specimens of 100mm x 100mm x 450mm were cast and tested for flexure under both

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Kim, Sung-Hee, Dallas N. Little, and Eyad Masad. "Simple Methods to Estimate Inherent and Stress-Induced Anisotropy of Aggregate Base." Transportation Research Record: Journal of the Transportation Research Board 1913, no. 1 (2005): 24–31. http://dx.doi.org/10.1177/0361198105191300103.

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Simple methods to estimate cross-anisotropic properties of unbound aggregate assemblies on the basis of aggregate physical properties are presented. A regression model for the cross-anisotropic material properties was developed from a database consisting of aggregates from six sources. Aggregate specimens from each source were tested with the use of different gradations and compaction moisture contents. The results demonstrate that aggregate shape and gradation influence the level of anisotropy, which has a substantial effect on the pavement responses that affect pavement design. The level of

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Sadri, Fereidoon. "Aggregate operations in the information source tracking method." Theoretical Computer Science 133, no. 2 (1994): 421–42. http://dx.doi.org/10.1016/0304-3975(94)90196-1.

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23

Morales Fournier, Jessika, Debora Acosta Álvarez, Anadelys Alonso Aenlle, Antonio José Tenza-Abril, and Salvador Ivorra. "Combining Reclaimed Asphalt Pavement (RAP) and Recycled Concrete Aggregate (RCA) from Cuba to Obtain a Coarse Aggregate Fraction." Sustainability 12, no. 13 (2020): 5356. http://dx.doi.org/10.3390/su12135356.

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In Cuba, tons of construction and demolition waste (CDW) are generated during urban construction and reconstruction activities every year. The use of CDW, such as recycled concrete aggregates (RCA) and reclaimed asphalt pavement (RAP), in pavement construction is a viable solution to preserve the consumption of natural aggregates (NA), and to minimize the impact of landfill. The main objective of this work is to obtain a 5–10 mm aggregate fraction of RCA and RAP, to obtain an appropriate recycled coarse aggregate for manufacturing hot mix asphalt (HMA). Each source of RCA, RAP and NA, and the

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Youn, Jang-Kil, Hyo-Youl Kim, and Nam-Gi Lim. "A Study on Application of Dyeing Industrial Heat Source Waste Aggregate as Concrete Aggregate." Journal of the Korean Institute of Building Construction 5, no. 1 (2005): 123–29. http://dx.doi.org/10.5345/jkic.2005.5.1.123.

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Gostečnik, Metka, Predrag Šinik, Ana Mladenovič, Janez Ščančar, and Radmila Milačič. "Environmental Impacts of Mixed Aggregates for use in Unbound Layers in Road Construction." Materials and Geoenvironment 67, no. 1 (2020): 3–11. http://dx.doi.org/10.2478/rmzmag-2020-0002.

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AbstractDuring carbon steel manufacturing, large amounts of electric arc furnace (EAF) slag are generated. EAF slag, if properly treated and processed into aggregate, is an alternative source of high-quality material, which can substitute the use of natural aggregates in most demanding applications in the construction sector, mostly for wearing asphalt courses. In this screening process of high-quality aggregates, a side material with grain size 0/32 mm is also produced, which can be used as an aggregate for unbound layers in road construction. In this study, the environmental impacts of slag

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Hassan, K. E., M. S. Kuwari, and J. M. Reid. "Site Trials of Recycled and Secondary Aggregates in Concrete and Concrete Blocks in Qatar." International Journal on Pavement Engineering & Asphalt Technology 15, no. 2 (2014): 37–53. http://dx.doi.org/10.2478/ijpeat-2013-0011.

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Abstract A major construction programme is underway in Qatar. A shortage of local aggregate is focusing attention on the use of recycled and secondary aggregates. Site trials using locally available materials in structural concrete and concrete blocks were carried out in three small buildings. By far the largest source of recycled and secondary aggregates in Qatar is construction, demolition and excavation waste, which is generally crudely separated into excavation waste (EW) and construction/demolition waste (CDW). The other material investigated was incinerator bottom ash (IBA). The EW was u

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Tian, Jing, Johanna Pausch, Guirui Yu, Evgenia Blagodatskaya, and Yakov Kuzyakov. "Aggregate size and glucose level affect priming sources: A three-source-partitioning study." Soil Biology and Biochemistry 97 (June 2016): 199–210. http://dx.doi.org/10.1016/j.soilbio.2016.03.013.

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Li, Tianhua, Wenying Bai, Kejia Zhang, and Zichao Pan. "A study on image-processing based identification of aspect ratio of coarse aggregate." MATEC Web of Conferences 275 (2019): 02007. http://dx.doi.org/10.1051/matecconf/201927502007.

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The mesoscopic simulation of behaviours of cementitious materials under different conditions has become a hot topic in academic research, as it provides more details to the mechanism study and structural design. To conduct a mesoscopic simulation, the meso-scale model of cementitious materials must be built. To ensure the precision of the aggregate shape in the simulated meso-scale model, key shape parameters of real aggregates should be identified. In this paper, an image-processing based method is proposed to detect the aspect ratio of a polygonal aggregate. The procedure and used algorithms

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Butler, Liam, Jeffrey S. West, and Susan L. Tighe. "Effect of Recycled Concrete Aggregate Properties on Mixture Proportions of Structural Concrete." Transportation Research Record: Journal of the Transportation Research Board 2290, no. 1 (2012): 105–14. http://dx.doi.org/10.3141/2290-14.

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This study focuses on characterizing several recycled concrete aggregate (RCA) sources, developing concrete mixture proportions that incorporate RCA as coarse aggregate, and investigating the effect of coarse aggregate properties on the main mixture proportion parameters [i.e., cement content, water demand, and water–cement (w/c) ratio]. Four aggregate types were investigated: one control virgin aggregate source and three RCAs produced from the crushing of hardened concrete. Numerous aggregate tests, including density, absorption, abrasion resistance, adhered mortar content, and crushing value

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Bravo-German, Ana María, Iván Daniel Bravo-Gómez, Jaime A. Mesa, and Aníbal Maury-Ramírez. "Mechanical Properties of Concrete Using Recycled Aggregates Obtained from Old Paving Stones." Sustainability 13, no. 6 (2021): 3044. http://dx.doi.org/10.3390/su13063044.

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Nowadays, construction, maintenance, reparation, rehabilitation, retrofitting, and demolition from infrastructure and buildings generate large amounts of urban waste, which usually are inadequately disposed due to high costs and technical limitations. On the other hand, the increasing demand for natural aggregates for concrete production seriously affects mountains and rivers as they are the source of these nonrenewable goods. Consequently, the recycling of aggregates for concrete is gaining attention worldwide as an alternative to reduce the environmental impacts caused by the extraction of n

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Gottumukkala, Bharath, Sudhakar Reddy Kusam, Vivek Tandon, Amaranatha Reddy Muppireddy, and Ramya Sri Mullapudi. "Restriction of RAP% in HMA Based on Aggregate Gradation and Binder Properties." CivilEng 2, no. 3 (2021): 811–22. http://dx.doi.org/10.3390/civileng2030044.

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The use of recycled asphalt pavement (RAP) in pavement construction reduces the project cost and helps in conserving the naturally occurring aggregates. To incorporate RAP in hot mix asphalt, it is vital to know the amount and quality of the reclaimed binder. Three new asphalt binders were selected for this investigation. RAP material from one source was blended in different proportions with VG-10 and VG-30. Penetration, softening point, G */sin δ, G * sin δ and binder fatigue life Nf (from Linear Amplitude Sweep test) values of different blends were compared. The milled RAP aggregate gradatio

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Arnold, Greg, David Hughes, Andrew R. Dawson, and Des Robinson. "Design of Granular Pavements." Transportation Research Record: Journal of the Transportation Research Board 1819, no. 1 (2003): 194–200. http://dx.doi.org/10.3141/1819b-25.

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The use of high-quality quarried crushed rock aggregates is generally required to comply with current specifications for unbound granular materials (UGMs) in pavements. The source of these high-quality materials can be a long distance from the site, resulting in high transportation costs. The use of more local sources of marginal materials or the use of secondary aggregates is not allowed if they do not fully comply with existing specifications. These materials can, however, be assessed for their suitability for use in a pavement by considering performance criteria such as resistance to perman

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Chen, Zong Ping, Chun Heng Zhou, and Pei Huan Ye. "The Compressive Strength and Flexural Strength Test of Recycled Pebble Aggregate Concrete." Applied Mechanics and Materials 357-360 (August 2013): 1433–36. http://dx.doi.org/10.4028/www.scientific.net/amm.357-360.1433.

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Primary concrete of pebble coarse aggregate were used as the source of recycled aggregate concrete for pebble recycled coarse aggregate. Replacement rate of recycled aggregate for change parameter, 99 specimens were designed. The prism compressive strength, cube compressive strength and flexural strength were tested and achieved. The test results show that damage process and form of pebble coarse aggregate concrete are similar to those of normal concrete. It is gel adhesive failure between coarse aggregate and cement. Comparing with natural aggregate concrete, the strength indexes of recycled

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Suriya, Sneha, and Mohan Kumar. "STUDY ON THE PROPERTIES OF CONCRETE WITH DEMOLISHED WASTES AND SUGARCANE BAGASSE ASH." International Journal of Research -GRANTHAALAYAH 6, no. 3 (2018): 220–27. http://dx.doi.org/10.29121/granthaalayah.v6.i3.2018.1517.

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The increasing demand and scarcity of construction materials like cement and aggregates make the researches all over the world nowadays to focus on finding ways of utilizing industrial wastes and demolished wastes as source of raw materials and eco-friendly alternatives for concrete ingredients. Using recycled aggregates in concrete leads to preservation of the environment and promotes sustainable development. Recycled aggregate is obtained after crushing and screening of the construction rubble from tested laboratory specimens like cubes and cylinders. Sugarcane bagasse ash, the by-product of

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Dodson, R., S. Horiuchi, W. Scott, et al. "The VSOP Survey: final aggregate results." Proceedings of the International Astronomical Union 2, S238 (2006): 357–58. http://dx.doi.org/10.1017/s1743921307005431.

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AbstractIn February 1997 the Japanese radio astronomy satellite HALCA was launched to provide the space-borne element for the VSOP mission. HALCA provided linear baselines three-times greater than that of ground arrays, thus providing higher resolution and higher AGN brightness temperature measurements and limits. Twenty-five percent of the scientific time of the mission was devoted to the “VSOP survey” of bright, compact, extra-galactic radio sources at 5 GHz. A complete list of 294 survey targets were selected from pre-launch surveys, 91% of which were observed during the satellite's lifetim

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Yildiz, Dilek, and Peter W. F. Smith. "Models for Combining Aggregate-Level Administrative Data in the Absence of a Traditional Census." Journal of Official Statistics 31, no. 3 (2015): 431–51. http://dx.doi.org/10.1515/jos-2015-0026.

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Abstract Administrative data sources are an important component of population data collection and they have been used in census data production in the Nordic countries since the 1960s. A large amount of information about the population is already collected in administrative data sources by governments. However, there are some challenges to using administrative data sources to estimate population counts by age, sex, and geographical area as well as population characteristics. The main limitation with the administrative data sources is that they only collect information from a subset of the popu

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Kolstad, Charles D., and Michael D. Williams. "Aggregate Source-receptor Relations for Economic Analysis of Ambient Regulations." JAPCA 39, no. 6 (1989): 824–30. http://dx.doi.org/10.1080/08940630.1989.10466568.

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Rezaei B., Amir, Ebrahim M. Kolahdouz, Gary F. Dargush, and A. Scott Weber. "Ground source heat pump pipe performance with Tire Derived Aggregate." International Journal of Heat and Mass Transfer 55, no. 11-12 (2012): 2844–53. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2012.02.004.

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ZHUGINISSOV, Maratbek T., and Zhanar O. ZHUMADILOVA. "LIGHTWEIGHT AGGREGATE AND ASHES SLAG BASED CONCRETE WITH HIGH RESIDUAL FUEL CONTENT." Periódico Tchê Química 17, no. 34 (2020): 678–88. http://dx.doi.org/10.52571/ptq.v17.n34.2020.702_p34_pgs_678_688.pdf.

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Ashes slag materials in the chemical and mineralogical composition are largely identical to natural mineral raw materials. They are a source of environmental pollution, pose a threat to public health, and a threat to the flora and fauna of the surrounding areas. Ashes slag waste contains a large amount of unburned fuel. In some ashes, the content of unburned fuel can reach 20-40%. In this case, it is advisable to use it as a raw material for the production of artificial porous aggregates. The paper presents the results of studies on the development of lightweight aggregate technology based on

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Ramasubramani, R., and K. Gunasekaran. "Sustainable Alternate Materials for Concrete Production from Renewable Source and Waste." Sustainability 13, no. 3 (2021): 1204. http://dx.doi.org/10.3390/su13031204.

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Natural resources are being continuously extracted for the production of concrete which leads to degradation of the ecosystem. This is also a challenge for sustainability to save Nature. This study seeks to identify a suitable replacement material for river sand and stone aggregate for the sustainable utilization of renewable sources. Manufactured sand (M-sand) from industrial by-products and coconut shell (CS), an agricultural waste, are the resources selected as replacement materials for sustainability. This study uses M-sand as fine aggregate and CS coarse aggregate in place of river sand (

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Zukri, Azhani, Ramli Nazir, Khairun Nissa Mat Said, and Hossein Moayedi. "Physical and Mechanical Properties of Lightweight Expanded Clay Aggregate (LECA)." MATEC Web of Conferences 250 (2018): 01016. http://dx.doi.org/10.1051/matecconf/201825001016.

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Lightweight aggregate is the generic name of a group of aggregates having a relative density lower than normal aggregates (natural sand, gravel, and crushed stone), sometimes is referred to as low density aggregate. Depending on the source and the method of production, lightweight aggregates exhibit considerable differences in particle shape, texture and properties. Lightweight expanded clay aggregate (LECA) is among the common lightweight materials that have been applied successfully in civil engineering works. Many studies have been conducted to investigate the performances of LECA used in s

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Elsby, Michael W. L., Ryan Michaels, and David Ratner. "The aggregate effects of labor market frictions." Quantitative Economics 10, no. 3 (2019): 803–52. http://dx.doi.org/10.3982/qe916.

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Labor market frictions are able to induce sluggish aggregate employment dynamics. However, these frictions have strong implications for the source of this propagation: they distort the path of aggregate employment by impeding the flow of labor across firms. For a canonical class of frictions, we show how observable measures of such flows can be used to assess the effect of frictions on aggregate employment dynamics. Application of this approach to establishment microdata for the United States reveals that the empirical flow of labor across firms deviates markedly from the predictions of canoni

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Liu, Man, Guilin Han, Zichuan Li, Qian Zhang, and Zhaoliang Song. "Soil organic carbon sequestration in soil aggregates in the karst Critical Zone Observatory, Southwest China." Plant, Soil and Environment 65, No. 5 (2019): 253–59. http://dx.doi.org/10.17221/602/2018-pse.

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Soil organic carbon (SOC) sequestration in aggregates under land use change have been widely concerned due to intimate impacts on the sink (or source) of atmospheric carbon dioxide (CO<sub>2</sub>). However, the quantitative relationship between soil aggregation and SOC sequestration under land uses change has been poorly studied. Distribution of aggregates, SOC contents in bulk soils and different size aggregates and their contributions to SOC sequestration were determined under different land uses in the Puding Karst Ecosystem Observation and Research Station, karst Critical Zone

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Li, Chuangui, Hongkui Zhao, Jianfeng Wu, Xiangang Li, and Ya Zhang. "Experimental study on the influence of recycled aggregates on the mechanical properties of concrete." E3S Web of Conferences 283 (2021): 01033. http://dx.doi.org/10.1051/e3sconf/202128301033.

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Construction solid waste has become an important environmental pollution source in the city, and the treatment and application of construction solid waste has become the focus of attention. Construction waste recycled aggregates have defects such as high water absorption and micro cracks, which affect its extensive application. In order to improve the utilization rate of recycled aggregates, the influence of different replacement rates of recycled aggregates on the mechanical properties of concrete is studied in this paper. The results show that with the increase of replacement rate of recycle

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Katuwal, Tek Bahadur. "Correlation between Concrete Compressive Strength and Rebound Number of River Bed and Crusher Run Coarse Aggregate in Pokhara Valley." Technical Journal 1, no. 1 (2019): 29–33. http://dx.doi.org/10.3126/tj.v1i1.27584.

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Concrete is principally composed of the mixture of cement, fine and coarse aggregates, and water and widely used for every building structure and other infrastructure. Aggregate has important functions as concrete making materials for the hardness and strength of concrete. The objective of this research was co – relation of compressive strength of concrete with Rebound number of crusher and river bed coarse aggregate in respect to the M20 grade of concrete with nominal mix. For this research, sample were taken from Hemja Crusher (HC), Hemja River Bed (HR), Kotre Crusher (KC), Kotre River Bed (

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binti Salehuddin, Shamshinar, Nur Liza Rahim, Norlia Mohamad Ibrahim, Siti Aza Nurdiana Tajri, and Mohd Zuhaidi Zainol Abidin. "The Behaviour of Rubber Tyre as Fine Aggregate in Concrete Mix." Applied Mechanics and Materials 754-755 (April 2015): 427–31. http://dx.doi.org/10.4028/www.scientific.net/amm.754-755.427.

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Usage of waste materials as concrete mixture can reduce the waste management crisis in the world. Used tyres were widely researched as an alternative source of aggregates replacement in concrete mixture. This research is to study the behaviour of concrete incorporating rubber tyre crumb as fine aggregate replacement. The workability, compression strength and water absorption of this concrete will be determined and then compared to normal concrete. Motorcycle inner tube will be used as rubber source and it will be shredded to crumbs. Three samples of concrete with rubber as fine aggregates were

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Costanza, S. E., and Ronald Helms. "Street Gangs and Aggregate Homicides." Homicide Studies 16, no. 3 (2012): 280–307. http://dx.doi.org/10.1177/1088767912449623.

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This study contributes to the body of research examining why city-level violence rates peaked in 1993. Taking homicide data from that year, we introduce an indicator for active street gangs along with indicators derived from common structural explanations of homicide rates. We assess whether gang presence is empirically associated with homicide variation across 154 U.S. central cities. Consistent with conceptual claims, correlational evidence demonstrates that active gangs were a significant source of homicides across this sample of cities. As a secondary concern, we assess structural conditio

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Bakshi, Sneha, and Manager Rajdeo Singh. "A petrochemical study of Mughal plasters of Quila-I-Ark, Aurangabad with respect to technology and repair." History of science and technology 10, no. 2 (2020): 163–84. http://dx.doi.org/10.32703/2415-7422-2020-10-2-163-184.

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This paper reports the mineralogical composition of western India's 16-17th century Mughal plasters of Quila-I-Ark, Aurangabad to prepare compatible repair mortar and document ancient Indian lime technology. Analytical studies were undertaken for aggregate grain size distribution, thin section analysis, Fourier Transform Infrared Spectrometer (FTIR), X-ray diffraction (XRD), and chemical composition of the plasters by x-ray fluorescence (XRF analysis). The analysis revealed the inclusion of large size basaltic aggregate grains mostly sourced from the water channel of nearby Harsullake. Some of

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Tan, Xiao Rong. "Experimental Study on Aggregate RAC." Advanced Materials Research 1015 (August 2014): 255–58. http://dx.doi.org/10.4028/www.scientific.net/amr.1015.255.

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With the transformation of China's urbanization and accelerated pace of urban agglomeration, increasing construction waste has brought the conflict between the development of urban and environmental degradation. To use recycled aggregate (RA) to a certain extent eased pollution on the environment. Because of the source of RA cause exist quality poor stability, dispersion and other shortcomings. By test, comparative analysis the differences indicators between recycled aggregate and natural aggregate, brick gravel content of recycled coarse aggregate performance indicators in particular made a

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Rolski, Tomasz, Sabine Schlegel, and Volker Schmidt. "Asymptotics of palm-stationary buffer content distributions in fluid flow queues." Advances in Applied Probability 31, no. 01 (1999): 235–53. http://dx.doi.org/10.1017/s0001867800009046.

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We study a fluid flow queueing system with m independent sources alternating between periods of silence and activity; m ≥ 2. The distribution function of the activity periods of one source, is supposed to be intermediate regular varying. We show that the distribution of the net increment of the buffer during an aggregate activity period (i.e. when at least one source is active) is asymptotically tail-equivalent to the distribution of the net input during a single activity period with intermediate regular varying distribution function. In this way, we arrive at an asymptotic representation of t

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