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Experimental Study of Compressive Strength of Recycled ...

Total four concrete mix batches were tested in which one mix was of normal aggregate concrete at 0% replaced by RCA and other are of Recycled aggregate concrete at 20%, 40% and 60% replaced by RCA. The result of the test are shown in the table 1.The compressive strength of the specimens was calculated by following formula. F. cr = P/A where, F. cr

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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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(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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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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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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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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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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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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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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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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The Utilization of Recycled Masonry Aggregate and Recycled ...

For recycled aggregate concrete, this depends on the water absorption capacity of the recycled aggregate . The compressive strength of recycled aggregate concrete decreases with an increasing NA replacement rate [16,22,30]. No significant decline of compressive strength has been found for recycled aggregate concrete with 15% coarse RMA.

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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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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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USE OF SBR LATEXES TO MITIGATE INFERIOR CONCRETE ...

angular shape and roughened surface texture of recycled aggregates [1,3]. Hence, to produce similar workability, approximately 5% more water is required for RCA concrete, while 15% more water is needed when both fine and coarse recycled aggregates are used. On the hardened state, the use of RCA affects the interfacial

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Effects of Recycled Aggregate on Concrete Mix and Exposure ...

Dec 01, 2012· Highlights Plain concrete made with mixed recycled aggregate. Replacement rates 50% and 100%. Physical–mechanical properties and stress–strain relations were obtained. Reduction of workability, compressive strength and longitudinal modulus of deformation with replacement rate. Increased failure strain with replacement rate.

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Sustainable Construction: Use of Recycled Concrete Aggregate

7/7/2015· 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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Aggregates for Concrete - Memphis

Recycled concrete, or crushed waste concrete, is a feasible source of aggregates and an economic reality, especially where good aggregates are scarce. Conven-tional stone crushing equipment can be used, and new equipment has been developed to reduce noise and dust. Aggregates must conform to certain standards for

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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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Partial Replacement of Coarse Aggregate with Demolished ...

the demolished concrete aggregate 10%, 20%, 30% by weight of the conventional coarse aggregate and the concrete cubes were casted by that demolished concrete aggregate then further tests conducted such as workability, compressive strength for that DAC and the result obtained are found to be comparable with the conventional concrete.

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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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Experimental Study of Compressive Strength of Recycled ...

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 studied for the different combinations of RCA with NA.

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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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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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All about Workability of Concrete - Structural Guide

28-04-2020· More the water in the concrete, the more the workability of concrete. However, we cannot add water as we wish. Water shall only be added as specified in the mix design. Mix Proportions. The aggregate to cement ratio is affecting the workability of concrete. When the aggregate to cement ratio increases, there is less cement paste.

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Different Types & Sizes of Aggregate for Concrete ...

11-08-2018· 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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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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Aggregate in Concrete - The Concrete Network

Recycled concrete will have a higher absorption and lower specific gravity than conventional aggregates. To produce good quality, durable concrete containing a portion of recycled concrete aggregate often requires trial concrete mixes and close monitoring of the properties of the old recycled concrete, with mix adjustments made, as needed.

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Properties of high-workability concrete with recycled ...

ABSTRACT. 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.

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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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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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