Recycled Aggregate Concrete for Transportation Infrastructure

Surya, M.; Vvl, Kanta Rao; Parameswaran, Lakshmy

doi:10.1016/j.sbspro.2013.11.212

Cited by 61 publications

(17 citation statements)

References 13 publications

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“…ere are earlier researches that concluded partial replacement of NCA by RCA affects the compressive strength of concrete adversely [45,46]. On the contrary, there are studies which revealed that compressive strength of concrete produced from a blend of NCA and RCA (even with >10% proportion) has higher compressive strength at the age of 28 days than that of the concretes utilized only NCA [47][48][49]. e findings of this work agree with the later studies.…”

Section: Compressive Strengthsupporting

confidence: 89%

Suitability Investigation of Recycled Concrete Aggregates for Concrete Production: An Experimental Case Study

Taffese

2018

Advances in Civil Engineering

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In developing countries, construction and demolition waste (CDW) is disposed to landfill, causing social, environmental, and economic crises. In these nations, CDW exponentially increase due to their rapid economic growth, industrialization, and urbanization. This paper aims to examine the possibility of recycling concrete waste for production of new concrete in Ethiopia. Physical and mechanical characteristics of recycled concrete aggregate (RCA) acquired from concrete waste are thoroughly examined. Though the RCA exhibited relatively lesser performance compared with the natural coarse aggregate (NCA), it reveals the same properties as of normal-weight aggregates in several instances. The performance of concrete specimens which employ RCA up to 20% is evaluated from workability, strength, and permeability aspects. The utilization of RCA slightly affects the workability and the water permeability properties of the concretes. Replacement of 10% of the NCA by the RCA enhances the compressive strength of the hardened concrete by 8%. The difference between the splitting tensile strength of the concretes which employ RCA and conventional aggregates is trivial. Generally, this work demonstrates the practicability of concrete waste recycling to produce new concrete or construction materials in Ethiopian context.

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Section: Compressive Strengthsupporting

confidence: 89%

Suitability Investigation of Recycled Concrete Aggregates for Concrete Production: An Experimental Case Study

Taffese

2018

Advances in Civil Engineering

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“…In addition, air pollution resulting from dusts created from quarry areas has become a social issue for nearby communities. The use of RA can at least reduce the dependence of the industry on NA, and thus can maintain aggregate security and still ensure sustainable development (Pereira, 2007;Surya et al, 2013).…”

Section: Recovery and Protection Of The Environment And Its Natural Rmentioning

confidence: 99%

“…Physically, RA is composed of original aggregates with remains of a certain amount of mortar (cement paste) adhering to the aggregate particles. The presence of adhered mortar is relatively more porous and thus make the properties of RA has higher water absorption and lower strength characteristic compare to NA (Ismail & Ramli, 2014;Padmini et al, 2009;Surya, et al, 2013). Consequently, the incorporation of RA in concrete mixes can crucially affect on the concrete performance.…”

Section: Poor Quality Properties Of Ramentioning

confidence: 99%

Toward Sustainable Construction: Use of recycled aggregate in concrete in Malaysia

Ismail

Kwan

Ramli

2018

AjQoL

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This paper reviews several key issues related to the use of natural aggregate (NA) for concrete production, in view of the high demand for materials to meet the rapid construction development in Malaysia. The current paper aims to discuss the potential of recycling waste concrete to generate recycled aggregates (RA) that may be used as alternative aggregate sources in the production of concrete. Moreover, several major challenges to the use of RA for concrete production are also highlighted. This paper also provides an action plan to encourage the construction industry's wide usage of RA to achieve sustainable construction.

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“…The basic principle of this technology by Kong [25] lies in following steps: (i) wetting the aggregate, using certain amount of mixing water following by additive, (ii) adding the cement, and (iii) adding the remaining mixing water together with plasticizer. Various authors deal consequently with adopting this method for extended investigation [26] or with some modification of this method. Lee et al [14] applied "dry coating" where the coarse and fine aggregates were mixed first with melted sulphur to coat the aggregate surface, next the cement was added and dry-mixed with the coated aggregate and finally, fresh concrete was made by mixing with the water and superplasticizer.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Discharge Time, Kind of Additive, and Kind of Aggregate on the Properties of Three-Stage Mixed Concrete

Sičáková

Urban

2018

Sustainability

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Application of recycled aggregates (RA) for concrete production is limited due to their poor quality. While the environmental benefits of using the RA are well accepted, some unsolved problems prevent this type of material from wide application in structural concrete. The research and development of techniques which can minimize the adverse effect of RA on the concrete properties are highly requested. A specific mixing approach can also be helpful; here, mineral additives play a significant role for improvement of RA performance within the mixing process. However, delivery process can influence the homogeneity and uniformity of the concrete mixtures, resulting in negative effect on technical parameters. In this study, the impact of delivery time (0 min, 45 min, and 90 min) on the set of hardened concrete properties is presented while the three-stage mixing is used. Two kinds of additives—fly ash (FA) and recycled concrete powder (RCP)—were tested to coat the coarse fraction of recycled concrete aggregate (RCA) in the first step of mixing. For comparison, cement as coating material and natural aggregate instead the RCA were also used. The following parameters were tested after 28 days of setting and hardening: density, compressive strength, splitting tensile strength, water absorption capacity, and depth of penetration of water under pressure. Generally, 90 min of working with concrete mixtures left no significantly negative influence on tested characteristics. Based on ANOVA results, with prolonged discharge time, the changes in composition of the mixtures become less important for compressive strength, density, and water absorption.

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Recycled Aggregate Concrete for Transportation Infrastructure

Cited by 61 publications

References 13 publications

Suitability Investigation of Recycled Concrete Aggregates for Concrete Production: An Experimental Case Study

Suitability Investigation of Recycled Concrete Aggregates for Concrete Production: An Experimental Case Study

Toward Sustainable Construction: Use of recycled aggregate in concrete in Malaysia

The Influence of Discharge Time, Kind of Additive, and Kind of Aggregate on the Properties of Three-Stage Mixed Concrete

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