Utilizing recycled aggregate concrete in sustainable construction for a required compressive strength ratio

Mi, Renjie; Pan, Ganghua; Liew, K.M.; Kuang, Tongchun

doi:10.1016/j.jclepro.2020.124249

Cited by 70 publications

(28 citation statements)

References 57 publications

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“…Therefore, the use of RCA with a low amount residual mortar can alleviate the slump loss. The lower slump values of RAC compared to NAC are commonly reported in previous studies [52,53] and can be attributed to the following reasons: (i) high water absorption of RCA; and (ii) reduction in the amount of cement and fine aggregate due to the application of the EMV mix design. At 50% replacement ratio, the slump ranged from 60 to 85 mm, which satisfies the minimum slump requirement of 80 ± 25 mm for normal weight concrete with a maximum aggregate size of 20 and 25 mm according to KS F4009 [54] and practically means a medium workability suitable for standard compaction techniques such as vibration.…”

Section: Fresh Propertiessupporting

confidence: 58%

Effect of Aggregate Size on Recycled Aggregate Concrete under Equivalent Mortar Volume Mix Design

Jang¹,

Kim

Sičáková

2021

Applied Sciences

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In this paper, the effect of the original aggregate size of the recycled aggregate on the mechanical properties of the recycled aggregate concrete was evaluated. A series of concretes were produced in which natural aggregates, recycled aggregates, and original aggregates in recycled aggregates were matched for a single particle size distribution curve. The replacement levels of recycled aggregate were 25% and 50%, and equivalent mortar volume mix design was applied for recycled aggregate concrete. The results show that the mechanical strength of recycled aggregate concrete increases with increasing original aggregate size. This effect was observed to be greater in concrete using recycled aggregate with a high residual mortar content.

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Section: Fresh Propertiessupporting

confidence: 58%

Effect of Aggregate Size on Recycled Aggregate Concrete under Equivalent Mortar Volume Mix Design

Jang¹,

Kim

Sičáková

2021

Applied Sciences

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“…The authors discovered that the amount of water added to restore the water absorbed by the recycled coarse aggregate, as well as the shape and texture of RCA, affected the fresh properties of concrete containing RCA. Furthermore, Mi et al [22] discovered that RAC specimens have slump values that are 103-88 mm lower than NAC specimens. The authors came to the conclusion that the reason was due to the aggregate's water absorption ratio.…”

Section: Fresh Properties Of Recycled Aggregate Concretesmentioning

confidence: 99%

A review on recycled aggregate concretes (RACs)

Musa

2022

J. Phys.: Conf. Ser.

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The recycling of waste concrete materials in the civil constructions is a critical issue like recycled aggregate concrete is weakly adhered mortar having higher porosity and water absorption, forming weak interfacial transition zones, causing an adverse impact on the mechanical properties and durability. But the use of pozzolanic materials as supplementary cementitious materials in recycled aggregate concrete, is more effective and feasible method of improving the overall mechanical and durability properties of recycled aggregate concrete. This paper reviews various methods for improving the mechanical and durability properties of RACs. Despite the fact that many research studies have been conducted in this area, there are significant gaps in the current state of knowledge on the performance of RACs. As a result, this paper identifies the gaps in current knowledge on improving mechanical and durability properties of RAC and provides recommendations for future research.

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“…Basically, the untreated RAC does not act as well as NAC in terms of mechanical properties and durability performance [22][23][24][25][26]. However, the applicability of the RCA to concrete is clear [27,28], and RCA is practically being used for concrete production [10,29]. In this context, research on RCA and RAC is progressing.…”

Section: Introductionmentioning

confidence: 99%

Some Remarks towards a Better Understanding of the Use of Concrete Recycled Aggregate: A Review

et al. 2021

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Research on recycled concrete aggregates (RCAs) has been progressively advanced. Beyond replacing natural aggregates with RCA, discussions have been held on the effect of the parent concrete and repeatedly recycled aggregate concrete. Although it has been reported that RCA can be technically used for structural concrete, due to several other factors, RCA is mainly used for sub-bases. Therefore, identifying these factors is the key to promoting the use of RCA. Therefore, this review study first briefly summarizes the physical and chemical characteristics of RCA compared to natural aggregate, and reviews the effects of parent concrete and repeatedly recycled aggregate on next generation concrete. This study also briefly discusses the RCA standards of various countries and the factors that hinder the widespread use of RCA. The results show that there is a correlation in properties between parent concrete and the next generation concrete, and the properties of concrete decrease when RCA is used repeatedly. In addition, on the basis of the literature review, factors hindering the use of RCA were found to be unstable supply and demand, economic feasibility, and negative perceptions.

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Utilizing recycled aggregate concrete in sustainable construction for a required compressive strength ratio

Cited by 70 publications

References 57 publications

Effect of Aggregate Size on Recycled Aggregate Concrete under Equivalent Mortar Volume Mix Design

Effect of Aggregate Size on Recycled Aggregate Concrete under Equivalent Mortar Volume Mix Design

A review on recycled aggregate concretes (RACs)

Some Remarks towards a Better Understanding of the Use of Concrete Recycled Aggregate: A Review

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