scholarly journals Green Concrete from Sustainable Recycled Coarse Aggregates: Mechanical and Durability Properties

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Neeraj Jain ◽  
Mridul Garg ◽  
A. K. Minocha
Keyword(s):  
Physical And Mechanical Properties ◽  
Chloride Ions ◽  
Recycled Aggregate ◽  
Engineering Properties ◽  
Hardened Concrete ◽  
Green Concrete ◽  
Coarse Aggregates ◽  
Durability Properties ◽  
Natural Aggregates

Present investigations deal with the development of green concrete (M 30 grade) using recycled coarse aggregates for sustainable development. Characterization of recycled coarse aggregates showed that physical and mechanical properties are of inferior quality and improvement in properties was observed after washing due to removal of old weak mortar adhered on its surface. The influence of natural coarse aggregates replacement (50 and 100%) with recycled coarse aggregate on various mechanical and durability properties of hardened concrete were discussed and compared with controls at different w/c ratio. Improvements in all the engineering properties of hardened concrete were observed using washed recycled coarse aggregates. The compressive strength of 28-day hardened concrete containing 100% washed recycled aggregate was slightly lower (7%) than concrete prepared with natural aggregates. Water absorption, carbonation, and rapid chloride penetration test were conducted to assess the durability of the concrete. Concrete was found moderately permeable for chloride ions penetration and no carbonation was observed in all the concrete mixes studied.

scholarly journals Concrete produced with recycled aggregates

2012 ◽  
Vol 5 (5) ◽  
pp. 692-701 ◽  
Author(s):  
J. J. L. Tenório ◽  
P. C. C. Gomes ◽  
C. C. Rodrigues ◽  
T. F. F. de Alencar
Keyword(s):  
Coarse Aggregate ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Recycled Aggregates ◽  
Hardened Concrete ◽  
Specific Mass ◽  
River Sand ◽  
Recycled Coarse Aggregate ◽  
Coarse Aggregates ◽  
Natural Aggregates

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 specific mass with a greater density was obtained by mixing the recycled aggregates of the CDW with the recycled aggregates of concrete wastes (CW). The concrete was produced in laboratory by combining three water-cement ratios, the ratios were used in agreement with NBR 6118 for structural concretes, with each recycled coarse aggregates and recycled sand or river sand, and the reference concrete was produced with natural aggregates. It was observed that recycled aggregates can be used in concrete with properties for structural concrete. In general, the use of recycled coarse aggregate in combination with recycled sand did not provide good results; but when the less porous was used, or the recycled coarse aggregate of a specific mass with a greater density, the properties of the concrete showed better results. Some RAC reached bigger strengths than the reference concrete.

scholarly journals Effects of Recycled Aggregate Resin (RAR) in Concrete Material

2020 ◽  
Vol 11 (2) ◽  
Author(s):  
Sharifah Salwa Mohd Zuki ◽  
◽  
Shahiron Shahidan ◽  
Shivaraj Subramaniam ◽  
◽  
...  
Keyword(s):  
Epoxy Resin ◽  
Recycled Aggregate Concrete ◽  
Construction And Demolition Waste ◽  
Recycled Aggregate ◽  
Engineering Properties ◽  
Recycled Aggregates ◽  
Hardened Concrete ◽  
Demolition Waste ◽  
Split Tensile Strength ◽  
Close Proximity

This paper discussed the recycled aggregates produced from construction and demolition waste and their utilization in concrete construction. Along with a brief overview of the engineering properties of recycled aggregates, the paper also summarizes the effect and use of recycled aggregates on the properties of fresh and hardened concrete. The recycled aggregates were treated with epoxy resin to reduce the water absorptions with different percentages of resin such as 0%, 25%, 50%, 75%, and 100%. Epoxy resin is widely used in recent years owing to the enhancing of mechanical and durability of the concrete. This research also showed, recycled aggregate concrete are close proximity to normal concrete in terms of split tensile strength, compression strength and wet density. The low usage of resin was obtained good strength concrete compared to high percentage contained treated aggregates due to low bonding between material.

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.

Performance Enhancement of Recycled Aggregate Concrete – An Experimental Study

2021 ◽  
Author(s):  
Sivamani Jagan ◽  
Thurvas Renganathan Neelakantan ◽  
Palaniraj Saravanakumar
Keyword(s):  
Mechanical Properties ◽  
Experimental Study ◽  
Elastic Modulus ◽  
Performance Enhancement ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Aggregate Concrete ◽  
Coarse Aggregates ◽  
Durability Properties ◽  
Concrete Mixtures

Extensive studies have been performed on the mechanical and durability properties of the concrete prepared with recycled coarse aggregates (RCA), however, only modest consideration has been given to the studies on the behaviour of RAC prepared by alternative mixing approach techniques. This study presents the mechanical properties of the recycled aggregate concrete (RAC) with different percentages of RCA prepared by normal mixing approach (NMA), two-stage mixing approach (TSMA) and sand enveloped mixing approach (SEMA) techniques. The manufactured concrete mixtures were tested for compression, tension, flexure and elastic modulus at 7, 28 and 90 days. The results indicate that the mechanical properties of the RAC (with 100% of RCA) prepared through TSMA and SEMA were improved by 9.36 and 12.14% at 28 days. Perhaps, prolonged curing to TSMA and SEMA mixtures improved the mechanical properties of the RAC that is nearly equal to normal aggregate concrete (NAC) prepared by NMA.

Mechanical Performance and Durability of Fly Ash Recycled Aggregate Concretes

2012 ◽  
Vol 538-541 ◽  
pp. 1568-1572
Author(s):  
Valeria Corinaldesi
Keyword(s):  
Fly Ash ◽  
Mechanical Performance ◽  
Point Of View ◽  
Recycled Concrete ◽  
Recycled Aggregate ◽  
Engineering Properties ◽  
Sustainable Construction ◽  
Reinforced Concrete Structure ◽  
Fly Ash Concrete ◽  
Natural Aggregates

According to the concept of sustainable development, the environmental load of a building must be evaluated throughout its life cycle, from design to construction, maintenance or repair, demolition, and rubble disposal. Therefore, from a holistic point of view, sustainable construction means designing a reinforced concrete structure with proper durability during a specified service life. This paper discusses the effect of partial and full replacement of natural aggregates by recycled concrete aggregates (RCA) in a fly ash concrete. Engineering properties and durability performance have been examined for mixtures designed with various proportions of the RCA by mass. Results obtained showed that the addition of RCA lowers concrete performance, but the combined use of RCA and fly ash could allow to achieve adequate engineering properties and durability.

scholarly journals Analysis of Concrete Made from Natural and Recycled Aggregate from Hardened Concrete

2020 ◽  
Vol 9 (5) ◽  
pp. 350-357
Keyword(s):  
Literature Review ◽  
Coarse Aggregate ◽  
Poor Performance ◽  
Recycled Aggregate ◽  
Hardened Concrete ◽  
The Poor ◽  
Stone Dust ◽  
Hardened Properties ◽  
Natural Aggregates ◽  
The Comparative Study

Detoriation of environment and depletion of natural resources is a major concern of the hour. Concrete not being an environmental pro material, a lot of work needs to be done on its sustainability parameters. Because of infrastructural growth to cater population needs, huge quantities of concrete are required. Since we all know that aggregates form around 75% of concrete volume, the quantities of aggregate required for the production of such huge quantities of concrete is immense. Hence a sustainable solution for the alternative of aggregate is urgently required to fulfill the shortage of aggregates. Keeping in mind the above problem the present work aims at finding a probable solution for utilizing the recycled aggregate obtained from destruction of hardened concrete. Since literature review suggested the poor performance of the concrete produced from recycled aggregate but did not give the best optimum situation in which it can be used. So the study was carried out on six different mixes containing natural aggregates and recycled aggregate for three different grades of concrete and both fresh and hardened properties of concrete was studied. No admixture was used for making concrete in any of the mixes. The comparative study showed that if recycled coarse aggregate is used with stone dust it gives better result and Total fines if used with natural coarse aggregate gives better result.

scholarly journals Experimental study of concrete prepared by kota stone dust, bagasse ash, and recycled concrete

2021 ◽  
Vol 889 (1) ◽  
pp. 012040
Author(s):  
Harshdeep Vani ◽  
Sahil Arora
Keyword(s):  
Experimental Study ◽  
Cost Analysis ◽  
Cost Reduction ◽  
Recycled Concrete ◽  
Recycled Aggregate ◽  
Green Concrete ◽  
Coarse Aggregates ◽  
Gas Formation ◽  
Stone Dust ◽  
The Cost

Abstract This paper mainly deals with the cost analysis of the concrete which is prepared using environmental waste which forms pollution and having its disposable issue also. This concrete may be termed as green concrete because the use of these materials decreases the harmful gas formation of the concrete. This paper deals with Kota Stone Dust, Bagasse Ash, and Recycled coarse aggregates. The concrete is prepared by the various ratios of Kota Stone in order of 5%, 10%, 15%, 20%, 25% and 30%. The use of bagasse ash was done in ratio 10%, 20%, 30%, 40% and use of Recycled Aggregate was done in ratio of 10%, 20%, 30% and 40%. After the successful experimental study of concrete using this material the cost reduction for M25 grade of concrete was found to be 645 INR.

scholarly journals Assessment of Engineering Properties of Artificial Aggregate Prepared From Canal Silt

2019 ◽  
Vol 8 (II) ◽  
Author(s):  
Safdar Iqbal ◽  
Beenish Jehan ◽  
Fasih Ahmed Khan ◽  
Hassan Nasir
Keyword(s):  
Polyvinyl Alcohol ◽  
Cement Content ◽  
Lightweight Aggregate ◽  
Dry Weight ◽  
Engineering Properties ◽  
Coarse Aggregates ◽  
Particles Size Distribution ◽  
Index Terms ◽  
Natural Aggregates ◽  
Aggregate Shape

In this research the canal silt from the Kabul River Canal was recycled to manufacture artificial aggregate. For making artificial aggregates three batches were prepared each of dry weight of 100kg. The composition of artificial aggregate is Polyvinyl Alcohol (PVA), Ordinary Portland Cement (OPC) and Silt was mixed in different proportions (by weight). Three batches were made having values of PVA varying from 0, 1 and 2 percent, cement content was 20, 19 and 18 percent respectively, and the quantity of silt used was kept constant (80%) in each batch. Samples were prepared from these three different batches and were cured for 28 days. After completion of the curing time, they were crushed to get the desired course aggregate. A number of tests were performed to check the viability of artificial aggregates for being used as a lightweight aggregate. Shape and particles size distribution properties of artificial aggregates were as that of the natural aggregate but not satisfactory at high silt content. The reductions in the specific gravity of the artificial aggregate were also observed compared to natural aggregates.   Index Terms— Artificial Aggregates, Canal Silt, Coarse Aggregates, Lightweight Aggregates, Polyvinyl Alcohol (PVA).

scholarly journals A review on characteristics of pervious concrete using recycled aggregate

2021 ◽  
Vol 10 (1) ◽  
pp. 1-8
Author(s):  
Aaliya Navaz ◽  
Anju Paul
Keyword(s):  
Coarse Aggregate ◽  
Ground Level ◽  
Environmental Benefits ◽  
Pervious Concrete ◽  
Recycled Aggregate ◽  
Fine Aggregate ◽  
Concrete Compressive Strength ◽  
Coarse Aggregates ◽  
Natural Aggregates ◽  
Pass Through

Pervious concrete is a mixture of cement, coarse aggregate mixed with water. The absence of fine aggregate helps increase the voids and water can pass through these gaps and reaches to ground level. The use of recycled coarse aggregates from construction and demolition is a sustainable solution with many environmental benefits and also reduces the number of virgin aggregates to be created, hence reducing the extraction of natural resources. This paper reviews the research developments of pervious concrete by replacing natural aggregates with different percentages of recycled coarse aggregate. The papers under consideration of review have conducted to identify various properties of pervious concrete such as mechanical and hydrological properties. Keywords— pervious concrete, compressive strength, permeability

scholarly journals Synthesis of Geopolymer Based Class-F Fly Ash Aggregates and its Composite Properties in Concrete

2014 ◽  
Vol 60 (1) ◽  
pp. 55-75 ◽  
Author(s):  
P. Gomathi ◽  
A. Sivakumar
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Physical And Mechanical Properties ◽  
Engineering Properties ◽  
Polymerization Reaction ◽  
Hardened Concrete ◽  
Different Types ◽  
Class F Fly Ash ◽  
Ash Aggregates ◽  
Class F

Abstract This study explores the influence of alkali activators on the initiation of polymerization reaction of alumino-silicate minerals present in class-F fly ash material. Different types of fly ash aggregates were produced with silicate rich binders (bentonite and metakaolin) and the effect of alkali activators on the strength gain properties were analyzed. A comprehensive examination on its physical and mechanical properties of the various artificial fly ash aggregates has been carried out systematically. A pelletizer machine was fabricated in this study to produce aggregate pellets from fly ash. The efficiency and strength of pellets was improved by mixing fly ash with different binder materials such as ground granulated blast furnace slag (GGBS), metakaolin and bentonite. Further, the activation of fl y ash binders was done using sodium hydroxide for improving its binding properties. Concrete mixes were designed and prepared with the different fly ash based aggregates containing different ingredients. Hardened concrete specimens after sufficient curing was tested for assessing the mechanical properties of different types concrete mixes. Test results indicated that fly ash -GGBS aggregates (30S2-100) with alkali activator at 10M exhibited highest crushing strength containing of 22.81 MPa. Similarly, the concrete mix with 20% fly ash-GGBS based aggregate reported a highest compressive strength of 31.98 MPa. The fly ash based aggregates containing different binders was found to possess adequate engineering properties which can be suggested for moderate construction works.

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