scholarly journals Utilization of Construction Waste as Partial Replacement of Aggregates in Cement Concrete

2019 ◽  
Vol 8 (9S) ◽  
pp. 1028-1032
Keyword(s):  
Mechanical Properties ◽  
Sustainable Development ◽  
Coarse Aggregate ◽  
Construction Materials ◽  
Recycled Aggregates ◽  
Partial Replacement ◽  
Ceramic Tiles ◽  
Replacement Ratio ◽  
Construction Waste ◽  
Natural Aggregates

This paper containsstudy of marble waste asreplacement of fine andcoarseaggregatesinconcrete. Entire planetisfacing anissue of environment and climate.In this era sustainable development isin huge demand. Sustainable development has way of possibility by revising, rethinking, reducing, reusing. The use of construction waste materials in concrete industrial is playing key role to its economic, eco-friendly,green paybacksand engineering. Thisreviewreportsonthe utilization of wastemarble as aggregate inconcrete productionindustry. On the base of the reviewed studies, it was experiential that construction waste used in place of coarse aggregate contribute to the workability and mechanical properties of concrete. When natural aggregates relaced with coarse marble aggregates, ceramic tiles, recycled aggregates, it attained the bestresults at full replacement ratio. Additionally, waste construction materials in coarse aggregate form improves the mechanical properties overthe dust form. These sustainable alternatives not only enhance mechanical properties of concrete but also boost economy.

scholarly journals Mechanical Properties of Geopolymer Concrete Made With Partial Replacement of Coarse Aggregate by Recycled Aggregate

2019 ◽  
Vol 9 (1) ◽  
pp. 2301-2304 ◽  
Keyword(s):  
Mechanical Properties ◽  
Sodium Hydroxide ◽  
Sodium Silicate ◽  
Coarse Aggregate ◽  
Recycled Aggregate ◽  
Recycled Aggregates ◽  
Partial Replacement ◽  
Geopolymer Concrete ◽  
Recycled Coarse Aggregate ◽  
Coarse Aggregates

Construction is the one the fast growing field in the worldwide. There are many environmental issues connected with the manufacture of OPC, at the same time availability of natural coarse aggregate is getting reduced. Geopolymer binder and recycled aggregates are promising alternatives for OPC and natural coarse aggregates. It is produced by the chemical action of inorganic molecules and made up of Fly Ash, GGBS, fine aggregate, coarse aggregate and an alkaline solution of sodium hydroxide and sodium silicate. 10 M sodium hydroxide and sodium silicate alkali activators are used to synthesis the geopolymer in this study. Recycled aggregates are obtained from the construction demolished waste. The main focus of this work is to find out the mechanical properties of geopolymer concrete of grade G40 when natural coarse aggregate(NCA) is replaced by recycled coarse aggregate in various proportions such as 0%, 10%, 20%, 30%,40% and 50% and also to compare the results of geopolymer concrete made with recycled coarse aggregates(RAGPC) with geopolymer concrete of natural coarse aggregate(GPC) and controlled concrete manufactured with recycled aggregates(RAC) and controlled concrete of natural coarse aggregates(CC) of respective grade. It has been observed that the mechanical properties are enhanced in geopolymer concrete, both in natural coarse aggregate and recycled coarse aggregate up to 30% replacement when it is compared with the same grade of controlled concrete.

Mechanical Properties of Concrete Produced with Wastepaper for Application of Construction Materials

2014 ◽  
Vol 627 ◽  
pp. 369-372
Author(s):  
Hyun Ki Choi
Keyword(s):  
Mechanical Properties ◽  
Tensile Test ◽  
Construction Materials ◽  
Mix Design ◽  
Partial Replacement ◽  
Hardened Concrete ◽  
Mixing Ratio ◽  
Replacement Ratio ◽  
Influence Variable ◽  
Test Result

The purpose of this study was to analyze the mechanical properties of concrete produced with wastepaper for obtaining the optimum mix design of that. The concrete produced with wastepaper was made up of the cement, water, sand, and cut wastepaper. For this purpose, the concrete which had variety mixing ratio of materials was mixed and cured to find out the mechanical properties of that. And, it was performed the compressive and tensile test and the measurement of hardened concrete. The test result of this study was showed that the partial replacement ratio of wastepaper was the decisive influence variable and the correlation between the mechanical properties

Possibilities of Recycled Concrete Aggregate in Cement-Based Flowscreed

2014 ◽  
Vol 897 ◽  
pp. 247-251
Author(s):  
Adam Hubáček ◽  
Luc Boehme ◽  
Iveta Nováková
Keyword(s):  
Mechanical Properties ◽  
Recycled Concrete ◽  
Experimental Results ◽  
Recycled Aggregates ◽  
Partial Replacement ◽  
Concrete Aggregate ◽  
Rheological Characteristics ◽  
Test Results ◽  
Recycled Concrete Aggregate ◽  
Natural Aggregates

This paper presents some test-results of using fine recycled concrete as a partial replacement of natural aggregates in cement-based flowscreed. Special attention is given to describing and studying rheological characteristics and mechanical properties of cement-based flowscreed. Experimental results indicate that it is possible to prepare flowscreed with partial replacement of natural aggregates by recycled aggregates and obtain a quality that meets the requirements. This study was partially connected to the research-project RecyFlowscreed [1].

scholarly journals INFLUÊNCIA DE AGREGADOS RECICLADOS DE RESÍDUOS DE CONSTRUÇÃO EM PROPRIEDADES MECÂNICAS DO CONCRETO (doi:10.5216/reec.V11i1.35467)

2016 ◽  
Vol 11 (1) ◽  
Author(s):  
Daniel Lima Araújo ◽  
Ludmylla Pires Felix ◽  
Leonardo Costa Silva ◽  
Thiago Martins Santos
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Modulus Of Elasticity ◽  
Recycled Aggregates ◽  
Environmental Standards ◽  
Material Loss ◽  
Construction Waste ◽  
Final Destination ◽  
Natural Aggregate ◽  
Natural Aggregates

RESUMO: É notório o desperdício de materiais na construção civil, o que resulta na geração de resíduos de construção. Com a normalização ambiental recente, não se pode mais descartar esses resíduos de forma indiscriminada, porém deve-se dar aos mesmos uma destinação final adequada ou, sempre que possível, buscar a sua reutilização. Em grande parte, o resíduo gerado na indústria da construção civil é formado por concreto e argamassa, denominados de resíduos “cinzas”. Assim, este trabalho tem como objetivo analisar a substituição dos agregados graúdos naturais por agregados graúdos oriundos da reciclagem de resíduos “cinzas” da construção. Para isso, foram analisados traços de concreto contendo vários níveis de substituição (0%, 19%, 43%, 75%, 100%) do agregado natural pelo agregado reciclado. Foi verificada a influência dos agregados reciclados em algumas propriedades do concreto nos estados fresco e endurecido, com destaque para a resistência à compressão e o módulo de elasticidade. Os resultados mostraram ser possível a substituição de até 100% do agregado natural pelo agregado reciclado sem prejuízo da resistência mecânica do concreto e com redução de apenas 12% no módulo de elasticidade, o que indica a possibilidade do mesmo ser utilizado na produção de concretos com fins estruturais. ABSTRACT: The material loss in civil construction is large, which results in a great amount of construction waste. The latest environmental standards in Brazil do not allow that wastes are indiscriminately disposed of, and it is necessary to ensure their adequate final destination or, whenever possible, their reuse. The greater amount of construction waste is made up of concrete and mortar, called “grey waste”. The aim of this paper is analyze the replacement of natural aggregates with coarse recycled aggregates from grey construction waste. Several concrete mixes were produced with various substitution percentages (0%, 19%, 43%, 75%, 100%) of natural aggregates with coarse recycled aggregates to evaluate the influence of this substitution on the fresh and mechanical properties of the concrete. The most important mechanical properties analyzed are the compressive strength and modulus of elasticity. The results show that it is possible to replace up to 100% of the natural aggregate with recycled aggregates without reducing the compressive strength. In this case, the modulus of elasticity is reduced by only 12%. This suggests that recycled aggregates can be used in the production of structural concretes.

scholarly journals Mechanical Properties of Concrete with Substitution of Fine and Coarse Aggregate by Waste Materials in Concrete

2019 ◽  
Vol 8 (4) ◽  
pp. 5817-5820
Keyword(s):  
Mechanical Properties ◽  
Coarse Aggregate ◽  
Construction Materials ◽  
Copper Slag ◽  
Waste Materials ◽  
Partial Replacement ◽  
Fine Aggregate ◽  
River Sand ◽  
Aggregate Concrete ◽  
Concrete Mixtures

Paper Construction industry has been conducted various studies on the utilization of waste materials in concrete productions in order to decrease the usage of natural resources. This research paper exhibits the evaluation and the effective reuse of waste construction materials and industries, such as cuddapah waste aggregate as partial replacement of conventional coarse aggregate and copper slag as partial replacement of river sand (fine aggregate). Experiments were conducted to find out the mechanical properties of concrete such as compressive, splitting tensile, flexural strengths and the modulus of elasticity of concrete for waste materials aggregate concrete and to compare them with those of conventional aggregate concrete. Results appear that waste materials in concrete have the potential to produce good quality concrete mixtures.

scholarly journals Mortars with Recycled Aggregates from Building-Related Processes: A ‘Four-Step’ Methodological Proposal for a Review

2021 ◽  
Vol 13 (5) ◽  
pp. 2756
Author(s):  
Federica Vitale ◽  
Maurizio Nicolella
Keyword(s):  
Building Materials ◽  
Thermal Analyses ◽  
Construction Materials ◽  
Physical And Mechanical Properties ◽  
Research Trends ◽  
Mix Design ◽  
Recycled Aggregates ◽  
Design Parameters ◽  
Natural Aggregates ◽  
By Products

Because the production of aggregates for mortar and concrete is no longer sustainable, many attempts have been made to replace natural aggregates (NA) with recycled aggregates (RA) sourced from factories, recycling centers, and human activities such as construction and demolition works (C&D). This article reviews papers concerning mortars with fine RA from C&D debris, and from the by-products of the manufacturing and recycling processes of building materials. A four-step methodology based on searching, screening, clustering, and summarizing was proposed. The clustering variables were the type of aggregate, mix design parameters, tested properties, patents, and availability on the market. The number and the type of the clustering variables of each paper were analysed and compared. The results showed that the mortars were mainly characterized through their physical and mechanical properties, whereas few durability and thermal analyses were carried out. Moreover, few fine RA were sourced from the production waste of construction materials. Finally, there were no patents or products available on the market. The outcomes presented in this paper underlined the research trends that are useful to improve the knowledge on the suitability of fine RA from building-related processes in mortars.

scholarly journals Mortars with CDW Recycled Aggregates Submitted to High Levels of CO2

2021 ◽  
Vol 6 (11) ◽  
pp. 159
Author(s):  
Ricardo Infante Gomes ◽  
David Bastos ◽  
Catarina Brazão Farinha ◽  
Cinthia Maia Pederneiras ◽  
Rosário Veiga ◽  
...  
Keyword(s):  
Large Scale ◽  
Mechanical Performance ◽  
Construction Materials ◽  
Environmental Benefits ◽  
Recycled Aggregates ◽  
Construction And Demolition Wastes ◽  
Short Period ◽  
Natural Aggregates ◽  
Cement Factories ◽  
Made In

Construction and demolition wastes (CDW) are generated at a large scale and have a diversified potential in the construction sector. The replacement of natural aggregates (NA) with CDW recycled aggregates (RA) in construction materials, such as mortars, has several environmental benefits, such as the reduction in the natural resources used in these products and simultaneous prevention of waste landfill. Complementarily, CDW have the potential to capture CO2 since some of their components may carbonate, which also contributes to a decrease in global warming potential. The main objective of this research is to evaluate the influence of the exposure of CDW RA to CO2 produced in cement factories and its effect on mortars. Several mortars were developed with a volumetric ratio of 1:4 (cement: aggregate), with NA (reference mortar), CDW RA and CDW RA exposed to high levels of CO2 (CRA). The two types of waste aggregate were incorporated, replacing NA at 50% and 100% (in volume). The mortars with NA and non-carbonated RA and CRA from CDW were analysed, accounting for their performance in the fresh and hardened states in terms of workability, mechanical behaviour and water absorption by capillarity. It was concluded that mortars with CDW (both CRA and non-carbonated RA) generally present a good performance for non-structural purposes, although they suffer a moderate decrease in mechanical performance when NA is replaced with RA. Additionally, small improvements were found in the performance of the aggregates and mortars with CRA subjected to a CO2 curing for a short period (5 h), while a long carbonation period (5 d) led to a decrease in performance, contrary to the results obtained in the literature that indicate a significant increase in such characteristics. This difference could be because the literature focused on made-in-laboratory CDW aggregates, while, in this research, the wastes came from real demolition activities, and were thus older and more heterogeneous.

scholarly journals Mechanical Properties and Microstructural Features using Stone Dust as a Partial Replacement of Sand

2019 ◽  
Vol 8 (6) ◽  
pp. 5232-5237
Keyword(s):  
Mechanical Properties ◽  
Economic Growth ◽  
Sustainable Development ◽  
Compressive Strength ◽  
Flexural Strength ◽  
Natural Resources ◽  
Strength Test ◽  
Partial Replacement ◽  
Test Results ◽  
Stone Dust

Today’s world is always leads to development in technology as well as the economic growth though sometime these will affect the environment badly. That’s why world environmental commission coined the termed called sustainable development where development takes place without hampering the others’ needs. Concrete industry is rapidly growing industry in India which consumes lots of natural resources during the production of concrete. Here Stone dust is used as a sustainable material in place of sand partially. M25 grade of concrete has been chosen for the experiments. Different mechanical properties of concrete like compressive strength, Split tensile, flexural strength etc. and Microstructural features like SEM, EDX have been included in this study. Compressive Strength and flexural strength test results shown the increase in the strength. Sulphate Resistance Properties have been tested by curing the cubes in the MgSO4 solution and increase in weight has been observed. Similarities are found in the SEM pictures

The Behavior of FRA Concrete with High Replacement Ratio

2018 ◽  
Vol 760 ◽  
pp. 204-209 ◽  
Author(s):  
Magdaléna Šefflová
Keyword(s):  
Mechanical Properties ◽  
Physical And Mechanical Properties ◽  
Absorption Capacity ◽  
Recycled Aggregate ◽  
Partial Replacement ◽  
Hardened Concrete ◽  
Replacement Ratio ◽  
Natural Sand ◽  
Concrete Mixtures

This study deals with determination of the properties of the fine recycled aggregate (FRA) concrete with partial replacement of natural sand in concrete mixtures. The FRA was obtained from concrete waste and crushed on fraction 0 – 4 mm by laboratory jaw crusher. The geometrical and physical properties of natural sand and the FRA were tested. The main goal of this study is evaluation of the basic physical and mechanical properties of the concrete with partial natural sand replacement by the FRA such as workability, water absorption capacity, compressive strength and flexural strength. A total four concrete mixtures were prepared. The first concrete mixture was prepared only with natural sand, did not include the FRA. In other concrete mixtures, natural sand was replaced by the FRA in various replacement ratios (40 %, 50 %, and 60 %). All concrete mixtures were designated with the same parameters for clear comparison. The workability of fresh concrete mixtures and physical and mechanical properties of hardened concrete were tested.

scholarly journals Towards a New Analytical Creep Model for Cement-Based Concrete Using Design Standards Approach

Buildings ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 155
Author(s):  
Pablo Peña Torres ◽  
Elhem Ghorbel ◽  
George Wardeh
Keyword(s):  
International Standards ◽  
Analytical Models ◽  
Recycled Aggregates ◽  
Creep Model ◽  
Design Standards ◽  
Replacement Ratio ◽  
Creep Coefficient ◽  
Eurocode 2 ◽  
Natural Aggregates ◽  
Predicted Values

Creep properties are determined in design standards by measuring the creep coefficient, noted φ, as a function of time, t, and the age of the concrete at loading, t0. The work aims to study the validity of the analytical models proposed in the most used international standards and to check the possibility of their extension to estimate the creep of recycled aggregates concrete (RAC). A database was built from experimental results available in bibliographic references including 121 creep curves divided into 73 curves for natural aggregates concrete (NAC) and 48 curves for RAC. The comparison between the experimental and predicted values showed a significant dispersion for NAC and RAC. For the remediation of this dispersion, a new analytical model was developed for NAC. The parameters being the conventional creep coefficient, φ0, the power of the ageing function, named α, and βh, which accounts for the relative humidity and the compressive strength in the ageing function, were identified by inverse analysis. It was found that the power of the ageing function is 0.44 and not 0.3, as fixed by Eurocode 2 (EC2). Moreover, new expressions were proposed for φ0 and βh. The presence of recycled aggregates was considered through the equivalent replacement ratio.

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