workability of recycled concrete aggregate

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recycled concrete aggregate in philippines

recycled concrete aggregate in philippines. The Use of Recycled Concrete Aggregates (RCA) for, Because recycled aggregate contains mortar from the original concrete, it is more porous and absorptive than many natural aggregat Recycled aggregate had water absorption of 96% The workability of concrete, as the amount of recycled aggregate was increased, the concrete .

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Durability of Recycled Aggregate Concrete

Durability performance of hardened concrete made with recycled aggregates as partial or full replacement of natural coarse aggregates is reported. Resistance to pure water and sulfate attack is investigated. The results show that a replacement ratio of 50% does not have a significant effect on the performance of recycled aggregate concrete mixes.

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Aggregates - Portland Cement Association

Crushed aggregate is produced by crushing quarry rock, boulders, cobbles, or large-size gravel. Recycled concrete is a viable source of aggregate and has been satisfactorily used in granular subbases, soil-cement, and in new concrete. After harvesting, aggregate is processed: crushed, screened, and washed to obtain proper cleanliness and gradation.

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Strength and Durability Evaluation of Recycled .

recycled aggregates workability. May 14 2015 · Quality and availability of recycled aggregate are the main factors towards stable use and introduction of recycled aggregate concrete to the construction industry The crushed stone aggregate used in the study was obtained from a recycling plant which was established and directed towards reducing waste produced from the construction industry to ...

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Workability study of concretes made with recycled mortar ...

Higher water absorption of recycled concrete, in comparison with natural aggregate, is another factor that affects workability. In general, recycled mixtures willshowadecreaseofthe amountoffreewater [7,22, 29, 37]. Thus, to enhance the same workability, some researchers found that recycled concrete .

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Durability And Performance Characteristics Of Recycled ...

While studies on the engineering properties of concrete madewith laboratory- crushed recycled concrete aggregate abound (Frondistou–Yannas 1980; Hansen & Narud 1983), only limited data is available on commercial grade recycled concrete aggregate, including concrete mix proportions, fresh concrete performance and durability characteristics.

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Experimental Study of Compressive Strength of Recycled ...

the effect of recycled concrete aggregate on the strength of ordinary concrete. The basic engineering properties of Recycled Concrete Aggregate (RCA) is evaluated and it is compared with the Normal Aggregate (NA). Similarly, the basic concrete properties like, compressive strength, workability etc. are

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Use of Recycled Aggregate Concrete - Semantic Scholar

use of recycled aggregates has an adverse effect on the workability of concrete. Such an effect can be easily retained by using plasticizers. Also, concrete strength has been reduced by 5% to 25% depending on the percent of the normal aggregate replaced by recycled aggregate and the water-cement ratio.

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Workability and Compressive Strength of .

Concrete waste from construction site such as pile waste and tested concrete cubes waste is quite a problem for the contractor to dispose of. This waste is currently being buried or dumped illegally at a certain area, which lead to environmental pollution issue and waste of construction materials. In this study, concrete cubes waste from a concrete testing laboratory is crushed and recycled as ...

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Recycled Concrete—A Source for New Aggregate

The recycled aggregate concrete showed somewhat better workability characteristics than conventional mixes although its modulus of elasticity and durability characteristics were lower. It is proposed that satisfactory concrete can be made by recycling concrete as aggregate where disposal problems exist or where natural aggregate is either ...

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Recycled Aggregate Concrete: Applications, Advantages ...

Recycled aggregate concrete (RAC) is produced in three major steps: Evaluation of Source concrete: The first step in production of RAC is to determine the quality of the source concrete. Properties and records of source concrete like strength, durability and composition are looked into for deciding the proper source concrete.

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Sustainable Construction: Use of Recycled .

07-07-2015· The second study examines how the workability and compressive strength characteristics of concrete mixes are affected when varying amount of recycled concrete fines are used as cement replacement. Experimental procedures for both studies involved the breaking and crushing of cast concrete blocks to produce recycled materials.

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Crushed Concrete Aggregates - Properties and Uses of ...

Oct 21, 2018· Crushed concrete aggregates also called as recycled concrete aggregates are fragments and pieces of concrete buildings which are demolished or rebuild. These crushed concrete are cleaned from dirt and broken to smaller pieces to manufacture aggregate which is termed as recycled aggregate. Crushed concrete aggregate eliminates the need for disposal by using the .

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Recycled Concrete Aggregate - an overview | ScienceDirect ...

Recycled concrete aggregate (RCA) is the designation used in BS 8500-2 for recycled aggregate principally comprising crushed concrete. Designations of recycled aggregate other than RCA are of lower quality and may contain significant quantities of masonry which would preclude or limit their use in structural concrete.

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Recycled Aggregates - Portland Cement Association

The states that do use recycled concrete aggregate (RCA) in new concrete report that concrete with RCA performs equal to concrete with natural aggregates. Most agencies specify using the material directly in the project that is being reconstructed. ... To achieve the same workability, slump, and water-cement ratio as in conventional concrete ...

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PROPERTIES OF RECYCLED AGGREGATE CONCRETE

application of coarse recycled concrete aggregate, as the component materials in the con- crete mixtures, it is possible to produce structural concrete that can be satisfactory and even with high quality, which primarily depends on the characteristics of crushed demolished

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Workability study of concretes made with .

Workability study of concretes made with recycled mortar aggregate Workability study of concretes made with recycled mortar aggregate Leite, Mônica; Figueire do Filho, João; Lima, Paulo 2013-01-22 00:00:00 Materials and Structures (2013) 46:1765–1778 DOI 10.1617/s11527-012-0010-4 O R I G IN AL ARTI CL E Workability study of concretes made with recycled mortar aggregate • • Mo ˆ nica B ...

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Recycling of Concrete (Recycling Coarse .

It has been observed that the recycled coarse aggregate is used as normal aggregate. The workability of the concrete is increased by using RCA. Maximum properties of Recycled coarse aggregate have shown good with a little variation. Recycled aggregate materials produce harsh mixes with lower workability than Natural aggregates.

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Recycled Aggregate Concrete - LinkedIn SlideShare

Nov 15, 2014· Classification & properties of recycle aggregate concrete Material composition is the basis for classification of recycled concrete aggregate in two main types- 1) Crushed concrete 2) Mixed material Each of these types is divided in a class for bound and a class for unbound use Crushin g age Bulk specific gravity Bulk density Absorp tion ...

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PROPERTIES OF RECYCLED AGGREGATE CONCRETE

application of coarse recycled concrete aggregate, as the component materials in the con- crete mixtures, it is possible to produce structural concrete that can be satisfactory and even with high quality, which primarily depends on the characteristics of crushed demolished

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Sustainable Concrete Containing Recycled Aggregates and ...

Apr 02, 2020· Sustainable trails in the building industry called for preserving the natural resources through the production of green concrete. This is concrete where waste materials are used as at least one of its components, or its production does not lead to environmental destruction through the reduction, reuse or recycling techniques. Experimental results from a study on the potential usefulness of ...

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Recycled Aggregates - Portland Cement Association

Keywords: hardened properties, natural coarse aggregate, recycled concrete aggregate, workability 1. Introduction Construction developments are on its peak in the 21st century around the globe. There are numerous sky-scrapers, bridges, roads, underground tunnels, .

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Different Types & Sizes of Aggregate for Concrete ...

Aug 11, 2018· Aggregate may be natural, manufactured or recycled. It includes gravel, crushed stone, sand, slag, recycled concrete and geosynthetic aggregates. For a good concrete mix, aggregates need to be clean, hard, strong particles free of absorbed chemicals or coatings of clay and other fine materials that could cause the deterioration of concrete.

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All about Workability of Concrete - Structural Guide

Apr 28, 2020· The aggregate to cement ratio is affecting the workability of concrete. When the aggregate to cement ratio increases, there is less cement paste. Therefore, workability is reducing. ... there is a considerable impact on the consistency of concrete based on the content of the clay in the concrete. Effect of Recycled Fine Aggregates.

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Properties of high-workability concrete with .

This study presents the effects of recycled concrete aggregate (RCA) on the key fresh and hardened properties of concrete. RCA was used to produce high-workability concrete substituting 0-100% natural coarse aggregate (NCA) by weight. The slump and

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(PDF) Durability of recycled aggregate concrete | .

A lot of research has already been done on the mechanical properties of recycled aggregate concrete. This led to some changes in the standard for various applications. These authorized application remain quite low risk (Indoor, no frost, .). The

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Concrete - Wikipedia

Concrete is a composite material composed of fine and coarse aggregate bonded together with a fluid cement (cement paste) that hardens (cures) over time. In the past limebased cement binders were often used, such as lime putty, but sometimes with other hydraulic cements, such as a calcium aluminate cement or with Portland cement to form Portland cement concrete (named for its visual ...

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Recycled Aggregate Concrete: Applications, Advantages ...

Recycled aggregate concrete (RAC) is produced in three major steps: Evaluation of Source concrete: The first step in production of RAC is to determine the quality of the source concrete. Properties and records of source concrete like strength, durability and composition are looked into for deciding the proper source concrete.

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WORKABILITY STUDY FOR RECYCLED AGGREGATES

These aggregates which are often used in the production of concrete are named as recycled aggregates, mainly obtained from crushed concrete 2) Reasons for Use of Recycled Aggregate It is now widely accepted that there is a significant potential for reclaiming and recycling .

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Rheological Properties of Recycled Aggregate Concrete ...

workability of recycled aggregate concrete, a study of screening of admixtures was performed. For this purpose, rheological properties of mortar made up of fine elements are evaluated, after identifying the most effective admixtures in terms of workability and spread. 2.

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