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Relevant bibliographies by topics / Coarse aggregates

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Academic literature on the topic 'Coarse aggregates'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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Journal articles on the topic "Coarse aggregates"

1

Zhu, Ping Hua, Xin Jie Wang, and Jin Cai Feng. "On Properties of Recycled Coarse Aggregate from Repeatedly Recycling Waste Concrete." Advanced Materials Research 368-373 (October 2011): 2185–88. http://dx.doi.org/10.4028/www.scientific.net/amr.368-373.2185.

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The properties of recycled coarsee aggregates from repeatedly recycling waste concrete were determined. In this study, five series of concrete mixtures using coarse and fine natural aggregates were prepared, which have the same objective slump value from 35mm to 50mm and different compressive strengths ranging from 25MPa to 60 MPa. These five concretes were crushed, sieved, washed with water, hot treatmented at 300°C before they were used as recycled aggregates. After that, recycled aggregate concrete (RAC) was produced with an objectively compressive strength of 30MPa, in which the recycled c

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Suhendra, Suhendra. "Kajian Pengaruh Variasi Material Terhadap Kuat Tekan Beton." Jurnal Civronlit Unbari 3, no. 1 (2018): 55. http://dx.doi.org/10.33087/civronlit.v3i1.32.

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Aggregate quality is very influential on the strength of the resulting concrete. Both coarse and fine aggregates have various characteristics identified from laboratory test results. This study aims to examine the use of various aggregates for a quality of concrete. The coarse aggregate and the fine aggregate used are obtained from the nearest location to the work to be performed. The quality of the concrete reviewed is K-125, K-175 and K-225. The coarse aggregates used are 1-2 size (in cm), 2-3 size (in cm) crushed aggregate and coral. The fine aggregates used for each of the coarse aggregate

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Shen, Jianjun, Binqiang Wang, Jingru Hou, and Pengchao Yao. "Numerical Study on the Effect of Coarse Aggregate Shape during Concrete Mixing Process." Materials 17, no. 7 (2024): 1515. http://dx.doi.org/10.3390/ma17071515.

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The shape of coarse aggregate is an important factor determining the performance of concrete, and it also affects the whole mixing process. This article selected four typical coarse aggregates and simulated the motion behavior of the coarse aggregate and mortar in a dual horizontal axis mixer using discrete element software, EDEM. The mixing motion of coarse aggregates with different shapes and mortar was studied using average velocity, contact rate, and dispersion coefficient as indicators. The results show that the largest average speed in the mixing process was achieved with the spherical c

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Sun, Li, and Ying Wei Yun. "Experiment on Improving Performance of Recycled Coarse Aggregate from Waste Concrete." Applied Mechanics and Materials 174-177 (May 2012): 198–201. http://dx.doi.org/10.4028/www.scientific.net/amm.174-177.198.

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Recently recycled coarse aggregate concrete tends to be developed by using waste concrete considering environmental issues and conserving natural resources. However, performances of recycled coarse aggregate concrete are relative low compared with ordinary concrete due to the differences between recycled coarse aggregates and natural ones. In this research, developed mill is used to shuck the cement paste adhering on the surface of coarse aggregates to obtain shucking recycled coarse aggregates. Experimental results demonstrate that the performances of shucking recycled aggregates and concerne

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Kumutha, R., and K. Vijai. "Effect of Recycled Coarse Aggregates in Properties of Concrete." Journal of Green Building 3, no. 4 (2008): 130–37. http://dx.doi.org/10.3992/jgb.3.4.130.

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The properties of concrete containing coarse recycled aggregates were investigated. Laboratory trials were conducted to investigate the possibility of using recycled aggregates from the demolition wastes available locally as the replacement of natural coarse aggregates in concrete. A series of tests were carried out to determine the density, compressive strength, split tensile strength, flexural strength and modulus of elasticity of concrete with and without recycled aggregates. The water cement ratio was kept constant for all the mixes. The coarse aggregate in concrete was replaced with 0%, 2

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Mohammed, Laith, Ghazi Zarraq, and Imad Abdulzahra. "Validity of Euphrates River Terraces Deposits between Baghdad and Fallujah for Concrete Works." Iraqi Geological Journal 55, no. 2E (2022): 176–88. http://dx.doi.org/10.46717/igj.55.2e.12ms-2022-11-26.

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Four sites for deposits between Baghdad and Fallujah were studied. The results showed that all sites conform to the limits of the American Standard Specifications ASTMC33-03 and British Standard Specifications for Building Materials. As for Sieve Analysis for the coarse aggregate, the results for the first and fourth sites correspond to the nominal size of 4.75-19mm, with a deviation at the particle size of 19mm in the second and third sites. The apparent specific weight values ranged between 2.72-2.75 g/cm3 for fine aggregate and between 2.63-2.64 g/cm3 for coarse aggregate. While the rate of

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Tenório, J. J. L., P. C. C. Gomes, C. C. Rodrigues, and T. F. F. de Alencar. "Concrete produced with recycled aggregates." Revista IBRACON de Estruturas e Materiais 5, no. 5 (2012): 692–701. http://dx.doi.org/10.1590/s1983-41952012000500006.

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This paper presents the analysis of the mechanical and durable properties of recycled aggregate concrete (RAC) for using in concrete. The porosity of recycled coarse aggregates is known to influence the fresh and hardened concrete properties and these properties are related to the specific mass of the recycled coarse aggregates, which directly influences the mechanical properties of the concrete. The recycled aggregates were obtained from construction and demolition wastes (CDW), which were divided into recycled sand (fine) and coarse aggregates. Besides this, a recycled coarse aggregate of a

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Konitufe, Claudius, ALIYU ABUBAKAR, and Abubakar Sabo Baba. "Influence of Aggregate Size and Shape on the Compressive Strength of Concrete." CONSTRUCTION 3, no. 1 (2023): 15–22. http://dx.doi.org/10.15282/construction.v3i1.9075.

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This paper investigates the effect of the size and shape of coarse aggregates on the compressive strength of concrete. Concrete strength is aﬀected by the surface texture, grading and maximum aggregate size. Six different sizes of coarse aggregate have been selected for both angular and rounded coarse aggregate. The coarse aggregates were used in the production of concrete and tested for workability, density and compressive strength. The specimen was cured for 3, 7, 14, 21 and 28 days by full water immersion. The results indicated that under the same curing conditions and water-cement ratio, t

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Bian, Jiangwei, Wenbing Zhang, Zhenzhong Shen, Song Li, and Zhanglan Chen. "Analysis and optimization of mechanical properties of recycled concrete based on aggregate characteristics." Science and Engineering of Composite Materials 28, no. 1 (2021): 516–27. http://dx.doi.org/10.1515/secm-2021-0050.

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Abstract The most significant difference between recycled and natural concretes lies in aggregates. The performance of recycled coarse aggregates directly affects the characteristics of recycled concrete. Therefore, an in-depth study of aggregate characteristics is of great significance for improving the quality of recycled concrete. Based on the coarse aggregate content, maximum aggregate size, and aggregate shape, this study uses experiments, theoretical analysis, and numerical simulation to reveal the impact of aggregate characteristics on the mechanical properties of recycled concrete. In

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Siti Mira Maulida, Ucha Arief Pratama, Rafiqa Muhnita Yusputri, et al. "Influence of Flakiness and Elongation Index Compliance on Marshall Parameters in Asphalt Mixtures." Smart and Green Materials 2, no. 1 (2025): 62–70. https://doi.org/10.70028/sgm.v2i1.41.

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The road pavement layer comprises coarse aggregate, fine aggregate, filler, and asphalt. Increasing road infrastructure demand has led to a growing need for aggregates. According to Bina Marga, the aggregate flakiness and elongation index in the asphalt-concrete mix is limited to a maximum of 10%, whereas the British Standard and AASHTO in BS 812 set a limit of 25%. This index is assessed only for coarse aggregates with a minimum passing size of 3/8". This study evaluates the Marshall parameters of asphalt concrete mixtures using coarse aggregates that either fulfill and do not fulfill the fla

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Dissertations / Theses on the topic "Coarse aggregates"

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Kibriya, Tahir. "Properties of concrete with crushed brick coarse aggregates." Thesis, City University London, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.304518.

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Koulouris, Angelos. "Use of coarse recycled aggregates in designated concrete mixes." Thesis, Kingston University, 2005. http://eprints.kingston.ac.uk/20318/.

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This thesis is a detailed investigation on the suitability of secondary aggregates for use in concrete production. The aggregates under investigation, originated from construction and demolition sites of the Greater London area and were mainly from reinforced concrete structures dating back to the 60's-70's. The study investigated three sources of recycled concrete aggregate (RCA I, RCA II and RCA III). The first step in the investigation involved the characterisation of the aggregates through an extensive testing regime including physical, mechanical and chemical-mineralogical assessments. Ag

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Dodds, Wayne J. "Durability performance of coarse crushed concrete aggregate structural concrete." Thesis, Loughborough University, 2017. https://dspace.lboro.ac.uk/2134/27534.

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Crushed or recycled concrete aggregates (CCA/RCA) is an increasingly popular material as a replacement for natural aggregates in concrete due to industry demands for more recycled, lower carbon and responsibly sourced materials. In the UK, the majority of CCA is utilised in non-structural applications such as: a general fill material, road base/subbase or in low-grade concrete. Recycled aggregate producers however, are seeking new ways to incorporate CCA into higher value applications such as structural concrete to increase profits. Opportunities to incorporate CCA into structural concrete may

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Su, Haolin. "Properties of concrete with recycled aggregates as coarse aggregate and as-received/surface-modified rubber particles as fine aggregate." Thesis, University of Birmingham, 2015. http://etheses.bham.ac.uk//id/eprint/6003/.

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This research demonstrates that rubber particle size affects concrete workability and water permeability to a greater extent than fresh density and strength. Concrete with rubber particles of larger size tends to have a higher workability and fresh density than that with smaller particle sizes. However, rubber aggregates with smaller or continuously graded particle sizes are shown to have higher strengths and water permeability resistance. Influence of recycled aggregate and rubber aggregate as part substitutions for natural aggregates on concrete compressive strength was investigated and four

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FRANCESCONI, LORENA. "New building materials in structural engineering: “Structural concretes made with Coarse and Fine recycled aggregates”." Doctoral thesis, Università degli Studi di Cagliari, 2012. http://hdl.handle.net/11584/266080.

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With more than three tons per head, per year, concrete is the most important and widespread material used in construction worldwide. The Italian code allows the use of waste produced by construction and demolition (C&D) operations to produce recycled aggregates. The great interest, both technical-economic and environmental aroused by this subject has in recent years and all over the world led to a noteworthy increase in experimental and theoretical studies on recycled materials resulting from the construction sector and, in particular, on recycled aggregates. The possibility of utilizing recyc

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Momoh, Sufiyanu. "UTILIZATION OF RECYCLED COARSE AGGREGATES TO DEVELOP HIGH STRENGTH CONCRETE." OpenSIUC, 2017. https://opensiuc.lib.siu.edu/theses/2128.

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SUFIYANU MOMOH, for the Masters of Science degree in Civil Engineering, presented on April 12, 2017, at Southern Illinois University Carbondale. TITLE: Utilization of Recycled Coarse Aggregates to Develop High Strength Concrete. MAJOR PROFESSOR: Dr. Prabir K. Kolay The use of recycled coarse concrete aggregates (RCA) for the construction of road and other non-structural concrete has become a common practice these days. With the increasing demand of concrete, there has been an increase in the demand of natural coarse aggregate (NCA), which has sparked the research on the use of recycled coars

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Swift, Gregory Allen. "Characterization of coarse aggregate angularity using digital image processing." Diss., Rolla, Mo. : University of Missouri-Rolla, 2007. http://scholarsmine.mst.edu/thesis/pdf/Swift_09007dcc8042a3c4.pdf.

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Thesis (M.S.)--University of Missouri--Rolla, 2007.<br>Vita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed February 4, 2008) Includes bibliographical references (p. 65-69).

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Mora, Carlos F. "Particle size and shape analysis of coarse aggregate using digital image processing." Thesis, Hong Kong : University of Hong Kong, 2000. http://sunzi.lib.hku.hk/hkuto/record.jsp?B22030153.

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Reyes, Jaime. "Quantifying the role of coarse aggregate strength on resistance to load in HMA." To access this resource online via ProQuest Dissertations and Theses @ UTEP, 2007. http://0-proquest.umi.com.lib.utep.edu/login?COPT=REJTPTU0YmImSU5UPTAmVkVSPTI=&clientId=2515.

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Lim, Chen Leong. "Effects of maximum size coarse aggregate and superplasticizer on concrete strength." Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/50049.

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The effects of maximum size coarse aggregate on the relationship between accelerated strength and 14-day normally cured strength of normal and superplasticized concrete have been investigated. The results obtained show that differences among maximum size coarse aggregates are greater in normal concrete than in superplasticized concrete in strength-producing properties. Among the various sizes of aggregates investigated, one-half inch maximum size of coarse aggregate exhibited higher strength producing properties. This report includes the test results as well as the procedures for the preparat

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Books on the topic "Coarse aggregates"

1

Hunt, Liz. Micro-Deval coarse aggregate test evaluation: Final report. Oregon Dept. of Transportation, Research Group, 2001.

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Hunt, Liz. Micro-Deval coarse aggregate test evaluation: Final report. Oregon Dept. of Transportation, Research Group, 2001.

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Civieltechnisch Centrum Uitvoering Research en Regelgeving (Netherlands), ed. Structural behaviour of concrete with coarse lightweight aggregates. Published and distributed for CUR by A.A. Balkema, 1995.

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Fu, Chien N. Alternate polish value and soundness specifications for bituminous coarse aggregates. Texas Dept. of Transportation, 1998.

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Jacobs, F. A. An experiment to investigate rolled-asphalt wearing-courses with different coarse aggregates on A30 Staines by-pass. Pavement Materials and Construction Division, Highways and Structures Department, Transport and Road Research Laboratory, 1985.

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Jacobs, F. A. An experiment to investigate rolled-asphalt wearing-courses with different coarse aggregates on A30 Staines by-pass. Transport and Road Research Laboratory, Highways and Structures Dept., Pavement Materials and Construction Division, 1985.

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Tran, Nam H., Randy C. West, and Haleh Azari. Improved Test Methods for Specific Gravity and Absorption of Coarse and Fine Aggregate. Transportation Research Board, 2015. http://dx.doi.org/10.17226/22147.

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Tahir, Kibriya. Properties of concrete with crushed brick coarse aggregates. 1991.

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9

Performance of coarse matrix high binder hot-mix asphalt materials in the State of Texas. Texas Dept. of Transportation, Office of Research and Technology Transfer, 1997.

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10

Naiqian, Feng. Multifunctional Concrete Technology. Materials Research Forum LLC, 2022. http://dx.doi.org/10.21741/9781644901991.

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The book reviews production and applications of high- and ultrahigh strength multifunctional concrete. The use of various coarse and fine aggregates are covered, as well as ultrafine powders, new superplasticizers, anti-rust agents for steel bars and electrochemical protection technology.

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Book chapters on the topic "Coarse aggregates"

1

Sharma, Mahesh, Pankaj Rawat, and Aditya Rana. "Comparison of Dimension Limestone Waste Coarse Aggregates with Traditional Coarse Aggregates." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-4040-8_67.

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De Brabandere, Laurena, Vadim Grigorjev, Philip Van den Heede, Hannah Nachtergaele, Krist Degezelle, and Nele De Belie. "Use of the Fine Fraction from High-Quality Concrete Recycling as an Alternative Cement Substitute." In Lecture Notes in Civil Engineering. Springer Nature Switzerland, 2025. https://doi.org/10.1007/978-3-031-69626-8_16.

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AbstractIn order to meet the new demand for sustainability and lower carbon emissions for concrete, the production and recycling process has to be adapted. Regarding concrete recycling, the main focus in literature and industry is on the reuse of coarse aggregates. However, the recycling of concrete also generates a fine fraction. In this research, the fine fraction with size 0/2 is ground and studied as a partial cement replacement. First of all, the fines were characterized and their physical, chemical and mineralogical properties were determined. Preliminary tests on pastes and mortars with

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Ramge, Peter, Tilo Proske, and Hans-Carsten Kühne. "Segregation of Coarse Aggregates in Self-Compacting Concrete." In Design, Production and Placement of Self-Consolidating Concrete. Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-9664-7_10.

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Abd Razak, Rafiza, Mohd Mustafa Al Bakri Abdullah, Kamarudin Hussin, et al. "Performance of Sintered Pozzolanic Artificial Aggregates as Coarse Aggregate Replacement in Concrete." In Lecture Notes in Civil Engineering. Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-4918-6_10.

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Prathima, G., Bharathi Ganesh, Nagesh Puttaswamy, et al. "Feasibility of Processed Recycled Coarse Aggregate and Fine Aggregate as Aggregates for High Strength Concrete." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-2836-9_5.

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Joohari, Ilya, Mohd Izzat Joohari, and Ang Ai Leen. "Material Properties of Porous Concrete Using Recycled Coarse Aggregates." In Regional Conference on Science, Technology and Social Sciences (RCSTSS 2016). Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0074-5_27.

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Dhurvey, Priyanka, Harsh Panthi, Parth Verma, and Chandra Prakash Gaur. "Utilization of Waste Ceramic Tiles as Coarse Aggregates in Concrete." In Waste Recovery and Management. CRC Press, 2023. http://dx.doi.org/10.1201/9781003359784-16.

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Muduli, Rakesh, and Bibhuti Bhusan Mukharjee. "Characteristics of Concrete Prepared with Metakaolin and Recycled Coarse Aggregates." In Lecture Notes in Civil Engineering. Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-7480-7_6.

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Fonseca, E. S., K. M. A. Silva, S. H. S. Santana, L. M. Policarpio, and E. Bayraktar. "Evaluation of Reinforced Concrete (RC) with Different Scrap Coarse Aggregates." In Recycling of Plastics, Metals, and Their Composites. CRC Press, 2021. http://dx.doi.org/10.1201/9781003148760-24.

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Ikponmwosa, Efe Ewaen, and Musbau Ajibade Salau. "Shear Capacity of Reinforced Concrete Beams Using Recycled Coarse Aggregates." In Supplemental Proceedings. John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118062173.ch52.

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Conference papers on the topic "Coarse aggregates"

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Carro-López, Diego, Ignasi Fernandez, Carlos G. Berrocal, and Javier Eiras-López. "Bond behaviour of concrete with fine recycled aggregate." In IABSE Congress, San José 2024: Beyond Structural Engineering in a Changing World. International Association for Bridge and Structural Engineering (IABSE), 2024. https://doi.org/10.2749/sanjose.2024.0073.

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<p>The recycled aggregate industry allows reusing old structures that need to be demolished. Once crushed, the original concrete can be reused as aggregates for new concrete. However, this recycling technique has some limitations. While coarse recycled aggregates present a more uniform quality and can be used without difficulties, fine recycled aggregates under 4 mm exhibit a high degree of absorption that prevents its use. Previous research indicates, nevertheless, that the use of this substandard material is possible, leading to acceptable quality concrete that can be applied as base q

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Yu, Hui, Rodrigo J. Himiob, and William H. Hartt. "Effects of Reinforcement and Coarse Aggregates on Chloride Ingress and Time-to-Corrosion." In CORROSION 2007. NACE International, 2007. https://doi.org/10.5006/c2007-07290.

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Abstract The chloride concentration in concrete required to compromise reinforcing steel passivity and initiate active corrosion, [Cl−]th, is an important service life determinant for reinforced concrete structures. However, consensus regarding a value for [Cl−]th is lacking, as evidenced by the fact that reported experimental determinations vary by more than an order of magnitude. A recently recognized factor that contributes to the range in [Cl−]th is the obstruction to migration afforded by reinforcement, such that ingress of this species must be treated as two-rather than one-dimensional.

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Sipayung, Satria Masdoni, Alex Kurniawandy, and Muhammad Ikhsan. "Environment Effects of Refined Palm Oil (RPO) on Concrete Mixes." In Sriwijaya International Conference on Engineering and Technology 2023. Trans Tech Publications Ltd, 2025. https://doi.org/10.4028/p-e2x5rm.

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Nowadays the construction of palm oil industry mills is advancing rapidly and the next one is Refined Palm Oil (RPO). Refined Palm Oil (RPO) is one of the derivatives of palm oil processing. One option to use structures in the construction of palm oil mills is to use concrete. Plant parts that have concrete components often suffer damage, cracks and reduced concrete strength.This study is intended to examine the mechanical properties of concrete including compressive strength, flexural strength and porosity in concrete in the RPO environment, examining changes in the weight of coarse and fine

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Jayantha, W. R. A. N., E. M. S. K Ekanayake, V. G. S. Dilsara, and W. K. Mampearachchi. "Use of Tile Waste as an Internal Curing Aggregate (ICA) to Replace Coarse Aggregates in Roller Compacted Concrete (RCC) Production." In 2024 Moratuwa Engineering Research Conference (MERCon). IEEE, 2024. http://dx.doi.org/10.1109/mercon63886.2024.10688853.

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Refiyanni, Meidia, Sofyan M. Saleh, M. Isya, Sri Aprilia, and Ichvan Fadil. "Porous Asphalt: A Comparison of Modified Optimized Asphalt Content and Conventional Optimized Asphalt Content." In The 2nd International Conferences on Applied Engineering, Science, Technology and Innovation. Trans Tech Publications Ltd, 2025. https://doi.org/10.4028/p-bk32ag.

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Indonesia is a tropical country with high rainfall, which necessitates pavement with higher void content and good drainage conditions. The quality of road pavement depends on the materials used. One type of asphalt mixture with high void content and permeability but low stability is porous asphalt. This is due to the composition of porous asphalt, which consists predominantly of coarse aggregates compared to fine aggregates. This study utilizes waste tires, Low-Density Polyethylene (LDPE), gilsonite, and 60/70 penetration asphalt as binders, referred to as modified asphalt, in porous asphalt m

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Yu, Hui, William H. Hartt, and Yash P. Virmani. "Effects of Reinforcement and Coarse Aggregates on Chloride Ingress into Concrete and Time-to-Corrosion." In CORROSION 2007. NACE International, 2007. https://doi.org/10.5006/c2007-07289.

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Abstract The chloride concentration in concrete required to compromise reinforcing steel passivity and initiate active corrosion, [Cl−]th, is an important service life determinant for reinforced concrete structures. However, consensus regarding a value for [Cl−]th is lacking, as evidenced by the fact that reported experimental determinations vary by more than an order of magnitude. A recently recognized factor that contributes to the range in [Cl−]th is the obstruction to Cl− migration posed by reinforcement, such that ingress of this species must be treated as two-rather than one-dimensional.

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Yu, Hui, and William H. Hartt. "Modeling Analysis for the Effect of Finite Diffusivity Coarse Aggregates on Reinforcing Steel Corrosion Initiation." In CORROSION 2009. NACE International, 2009. https://doi.org/10.5006/c2009-09211.

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Abstract The exposure time at which a threshold Cl- concentration, Ct, is initially achieved at the reinforcement depth in concrete such that passivity is compromised and active corrosion initiates, Ti, is an important service life determinant for reinforced concrete structures. Composite component of concrete materials results in no consensus in the literature of a value for Ct, as reported concentrations extend over one order of magnitude, which was contributed to multi-parameter interaction. However, there is; and it has become increasingly apparent that Ct is distributed even for apparentl

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Akande, E. O., S. I. Ebirim, O. Suliat, et al. "Effects of Partial Replacement of Coarse Aggregates with Coconut Shell and Polyethylene Terephthalate on the Mechanical Properties of Concrete." In 2024 IEEE 5th International Conference on Electro-Computing Technologies for Humanity (NIGERCON). IEEE, 2024. https://doi.org/10.1109/nigercon62786.2024.10927081.

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Ejaz, Sheikh Zakria, Chaudhary Tabarak Shafqat, Usama Jameel, Hurraira Choudary, and Anwar Khitab. "Challenges in Translating Rubberized Mortar Properties to Concrete: Segregation and Shear Slump." In 14th International Civil Engineering Conference. Trans Tech Publications Ltd, 2025. https://doi.org/10.4028/p-1m7ixc.

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Rubberized cementitious composites are gaining focus in sustainable construction. Crumb rubber, sourced from waste tires, is used as a partial replacement for sand in concrete. However, rubber's low density, elasticity, and hydrophobic nature reduce workability and mechanical strength, owing to voids and poor compaction. To address these issues, supplementary cementitious materials (SCMs) like silica fume and fly ash, along with polypropylene (PP) fibres, were incorporated in this study. A control mortar mix with a 1:4 cement-to-sand ratio was established, and 10% of the sand was replaced by c

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Phuyal, Kabiraj, James Mahar, and Mustafa Mashal. "Utilization of Precipitated Calcium Carbonate (PCC) and Upcycled Concrete Aggregate (UCA) in Civil Engineering." In IABSE Congress, San José 2024: Beyond Structural Engineering in a Changing World. International Association for Bridge and Structural Engineering (IABSE), 2024. https://doi.org/10.2749/sanjose.2024.0146.

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<p>The purpose of this study is to utilize Precipitated Calcium Carbonate (PCC) and Upcycled Concrete Aggregate (UCA) in civil engineering. PCC is a fine to coarse grain material generated during the production of sugar from sugar beets. UCA is produced from demolished and returned concrete by the extraction of primarily calcium and alkalinity. The test results on PCC alone show that the optimum content to achieve a minimum 28 MPa (4000 psi) compressive strength is up to 30% by weight of Portland cement. The corresponding compressive strength of mixes in which conventional aggregate was

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Reports on the topic "Coarse aggregates"

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Garcia, Victor, and Benjamin Cox. Verification of current LA abrasion test criterion for aggregate degradation in airfield asphalt pavements. Engineer Research and Development Center (U.S.), 2024. http://dx.doi.org/10.21079/11681/48152.

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Low-quality mineral aggregates can potentially lead to production, construction, and long-term performance-related problems in asphalt concrete pavements. Therefore, effective qualification criteria for mineral aggregates are paramount. This study was performed to investigate the effectiveness of the Los Angeles abrasion (LAA) test to assess the abrasion resistance of coarse aggregates commonly used in airfield asphalt paving. The LAA test acceptance criteria currently specified by state departments of transportation were examined and compared to the current Department of Defense criterion. Ad

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Rahman, Shahedur, Rodrigo Salgado, Monica Prezzi, and Peter J. Becker. Improvement of Stiffness and Strength of Backfill Soils Through Optimization of Compaction Procedures and Specifications. Purdue University, 2020. http://dx.doi.org/10.5703/1288284317134.

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Vibration compaction is the most effective way of compacting coarse-grained materials. The effects of vibration frequency and amplitude on the compaction density of different backfill materials commonly used by INDOT (No. 4 natural sand, No. 24 stone sand, and No. 5, No. 8, No. 43 aggregates) were studied in this research. The test materials were characterized based on the particle sizes and morphology parameters using digital image analysis technique. Small-scale laboratory compaction tests were carried out with variable frequency and amplitude of vibrations using vibratory hammer and vibrato

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Bonvecchi, Alejandro, Juan C. Gómez Sabaini, Elssy Bonilla-Castro, Javier Alvaredo, Ernesto Calvo, and Maximiliano Castillo Carrillo. Measuring the Political Economy of Tax Lawmaking: A Methodology and Evidence from Argentina. Inter-American Development Bank, 2013. http://dx.doi.org/10.18235/0011521.

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Although recent research has shed new light on the political determinants and economic consequences of tax lawmaking, existing analyses rely on coarse data measuring political aggregates. Consequently, little is known about the political processes determining how tax legislation is written or their effect on the nature of tax reforms. This paper therefore develops a methodology to examine how Congress edits the content of tax legislation by measuring the ways Deputies, Senators, Presidents, and Ministers propose and amend such legislation. The Legislative Substance Scale proposed here measures

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Cross, Rachel, and Sandip Chhetri. Extended Testing of Strand Lifting Loop Capacity. Precast/Prestressed Concrete Intitute, 2023. http://dx.doi.org/10.15554/pci.rr.misc-008.

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This work on lifting loops builds on previous investigations and testing (Chhetri et al, 2020; Chhetri et al, 2021) and considers additional design and detailing parameters for prestressing strand lifting loops. The results from the loops in lightweight concrete demonstrated the influence of Mohs hardness of the coarse aggregate on loop capacity. These loops generally performed better than the Mertz test loops in normalweight concrete (Chhetri et al., 2021), which had a softer coarse aggregate. In addition, the strand bond of the loops used for the lightweight concrete testing was higher. Both

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Celaya, Brandon, and John Haddock. Investigation of Coarse Aggregate Strength for Use in Stone Matrix Asphalt. Purdue University, 2006. http://dx.doi.org/10.5703/1288284313400.

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Pajo, Bianka, Peter J. Becker, Philippe L. Bourdeau, and Marika Santagata. Data Interpretation of Automated Plate Load Test (APLT) for Real-Time In Situ Determination of Unbound Layer Resilient Modulus. Purdue University, 2023. http://dx.doi.org/10.5703/1288284317653.

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This project examined the results of an extensive program of (1) cyclic plate loading tests carried out at Purdue University’s S-BRITE site on two testing strips comprised of a coarse aggregate (Indiana #53) subbase layer compacted over either untreated or cement-stabilized subgrade, and (2) static loading tests conducted on #53 aggregate compacted in a 3.6-foot-deep testing pit. The testing program on the two strips included multistage resilient modulus (MR) tests and extended cyclic performance tests with random distributed loading (RDL) on both the subbase and the underlying subgrade. Two o

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Lee, Jusang, John E. Haddock, and Jongmyung Jeon. Development of Volumetric Acceptance and Percent Within Limits (PWL) and Criteria for Stone Metrix Asphalt (SMA) Mixtures in Indiana. Purdue University, 2022. http://dx.doi.org/10.5703/1288284317580.

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SMA is to be designed based on SMA volumetric properties in terms of air voids content (Va), voids in the mineral aggregate (VMA), and adequate stone-on-stone contact. For construction quality assurance (QA) purposes, INDOT currently accepts SMAs based on aggregate gradation and asphalt binder content. Thus, there is a discrepancy between SMA design criteria and construction acceptance. To better align design and construction, it is necessary to consider SMA volumetric properties in the use of QA. For HMA mixtures, INDOT has already transitioned from volumetric QA acceptance procedures to PWL.

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He, Rui, Na (Luna) Lu, and Jan Olek. Development of In-Situ Sensing Method for the Monitoring of Water-Cement (w/c) Values and the Effectiveness of Curing Concrete. Purdue University, 2022. http://dx.doi.org/10.5703/1288284317377.

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As the most widely used construction material, concrete is very durable and can provide long service life without extensive maintenance. The strength and durability of concrete are primarily influenced by the initial water-cement ratio value (w/c), and the curing condition during the hardening process also influences its performance. The w/c value is defined as the total mass of free water that can be consumed by hydration divided by the total mass of cement and any additional pozzolanic material such as fly ash, slag, silica fume. Once placed, field concrete pavements are routinely cured with

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Warin, Thierry. Canada–U.S. Trade in a Globalized Economy: Elasticities, Asymmetries, and Policy Imperatives. CIRANO, 2025. https://doi.org/10.54932/slph3996.

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This study examines the intricate trade interdependencies between Canada and the United States, highlighting how aggregate export–import figures can mask deeper economic realities. Approximately three-quarters of Canadian merchandise exports head to the United States each year, contributing to a bilateral merchandise trade surplus for Canada in the range of 100 to 170 billion Canadian dollars. Yet, when energy products are excluded, the United States shows a small surplus with Canada, illustrating how both sides benefit from specialized cross-border value chains. Analyses of selected sectors d

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EXPERIMENTAL AND NUMERICAL ANALYSIS OF L-SHAPED COLUMN COMPOSED OF RECYCLED AGGREGATE CONCRETE-FILLED SQUARE STEEL TUBES UNDER ECCENTRIC COMPRESSION. The Hong Kong Institute of Steel Construction, 2023. http://dx.doi.org/10.18057/ijasc.2023.19.2.10.

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The eccentric compression behaviors of L-shaped columns made of recycled aggregate concrete-filled square steel tubes (L-RACFST) with various replacement ratios of recycled coarse aggregate (RCA) are introduced in this paper. The experimental study demonstrates that the overall instability failure is the final failure mode of the L-RACFST columns and that the replacement ratio of RCA has little influence on the final failure mode of the specimens. When the RCA replacement ratio exceeds 40%, the specimens frequently move right into the failure stage. Recycled aggregate concrete (RAC) inside ste

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