Effect of recycled aggregates on fresh and hardened properties of self compacting concrete

Kapoor, Kanish; Singh, Surinder P.; Singh, Bhupinder; Singh, Paramveer

doi:10.1016/j.matpr.2020.02.753

Cited by 21 publications

(18 citation statements)

References 14 publications

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“…It is required in the specification that the SF2 level is suitable for ordinary reinforced concrete structures. According to previous studies [33,34], the content and shape of recycled aggregates and the change of water in the mixture will have an impact on slump flow. Groups 4-6 and 7-9 have an overall gradual decrease in slump flow with the increase of RCA.…”

Section: Performance Test Resultsmentioning

confidence: 96%

Mix Design of Recycled Coarse Aggregate Self‐Compacting Concrete Based on Orthogonal Test and Analysis of Mercury Intrusion Porosimetry

Gao

Qing

Han

et al. 2021

Advances in Materials Science and Engineering

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The influence of four factors (water-binder ratio, recycled coarse aggregate replacement rate, fly ash substitution rate, and superplasticizer content) on the workabilities and mechanical properties of recycled coarse aggregate self-compacting concrete (RCASCC) was studied using the orthogonal test method. Based on the orthogonal test design and range analysis method of the fresh and hardened properties of RCASCC, the optimal mix is as follows: water-binder ratio of 0.269, recycled coarse aggregate replacement rate of 30%, fly ash substitution rate of 40%, and superplasticizer content of 0.50%. Then, the porosity and aperture size distribution of nine groups of RCASCC were tested by mercury intrusion porosimetry (MIP) at the microlevel. The macroscopic and microscopic relationship was established by combining the results of mechanical property tests and MIP. Fractal dimension D of the B.B. Mandelbrot model was used to study the fractal characteristics of pore volume of RCASCC. Results showed that porosity and strengths are negatively correlated, and the relative strength can be roughly judged according to the porosity. The pore structure of nine groups of RCASCC materials has evident fractal characteristics of irregular shape. The complex pore structure adversely affects strength.

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Section: Performance Test Resultsmentioning

confidence: 96%

Mix Design of Recycled Coarse Aggregate Self‐Compacting Concrete Based on Orthogonal Test and Analysis of Mercury Intrusion Porosimetry

Gao

Qing

Han

et al. 2021

Advances in Materials Science and Engineering

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“…These decreasing and increasing trends were associated to the high porosity of the RCA. Kapoor et al (2020) studied the effect of recycled aggregates on the fresh and hardened properties of SCC. The latter replaced the natural aggregates with both recycled coarse and fine aggregates at different mix levels.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

A sustainable approach in using construction and demolition waste materials in concrete

Quedou¹,

Wirquin

Bokhoree

2021

WJE

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Purpose The purpose of this paper is to investigate the potential use of construction and demolition waste materials (C&DWM) as an alternative for natural fine aggregates (NFA), in view to solve the disposal problems caused due to landfills. In addition, to evaluate its suitability as a sustainable material, mechanical and durability properties have been performed on different proportions of concrete blending and the results recorded were compared with the reference concrete values. Design/methodology/approach In this research, the NFA were replaced at the proportion of 25%, 50%, 75% and 100% of C&DWM with a constant slump range of 130 mm–150 mm. This parameter will assess the consistency of the fresh concrete during transportation process. The characteristics of the end product was evaluated through various tests conducted on hardened concrete samples, namely, compressive strength, flexural strength, depth of penetration of water under pressure, rapid chloride penetration test, carbonation test and ultrasonic pulse velocity (UPV) test. All results recorded were compared with the reference concrete values. Findings The results demonstrated that the use of C&DWM in concrete portrayed prospective characteristics that could eventually change the concept of sustainable concrete. It was noted that the compressive and flexural strength decreased with the addition of C&DWM, but nevertheless, a continuous increase in strength was observed with an increase in curing period. Moreover, the increase in rapid chloride penetration and decrease in UPV over time period suggested that the concrete structure has improved in terms of compactness, thus giving rise to a less permeable concrete. The mechanical tests showed little discrepancies in the final results when compared to reference concrete. Therefore, it is opined that C&DWM can be used effectively in concrete. Originality/value This study explores the possible utilisation of C&DWM as a suitable surrogative materials in concrete in a practical perspective, where the slump parameter will be kept constant throughout the experimental process. Moreover, research on this method is very limited and is yet to be elaborated in-depth. This approach will encourage the use of C&DWM in the construction sector and in the same time minimise the disposal problems caused due to in landfills.

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“…However, despite the increasing trend in the reuse of demolition waste; it has been shown that the use of recycled aggregates (RA) can limit or decrease the properties of concrete (strength, durability and serviceability) due to old binding mortar, irregular shape and increased porosity. In other words, there is a direct dependence between concrete properties and the degree of substitution used with RA [12], [13]. Several tests have concluded that the incorporation of recycled products (coarse aggregates) should not exceed 20% to preserve the properties of recycled concrete, which is a worldwide normative recommendation.…”

Section: Introductionmentioning

confidence: 99%

“…Given the high energy consumption of the concrete industry due to the high demand for natural resources and the environmental risks involved, RA have been used as partial or full substitutes to minimise the environmental impact, taking an important step towards establishing a sustainable society and boosting the circular economy [12], [17] , [18]. RA is a type of composite material whose quality depends directly on the origin of the waste, the place and reason for demolition and the original characteristics of the concrete [19].…”

Section: Introductionmentioning

confidence: 99%

Influence of design parameters on the fresh and durable properties of self-compacting concrete with recycled aggregate

Martínez‐García

Jagades²,

Fraile‐Fernández

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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The objective of this paper is to analyse the influence of design parameters on the fresh and mechanical properties in the manufacture of self-compacting concrete with recycled fine and coarse aggregates. Design parameters such as water-cement ratio, water/paste ratio, total aggregate to cement ratio, fine aggregate to coarse aggregate ratio, water to solid ratio in percentage, superplasticiser content, RCA replacement percentage and RFA replacement percentage are analysed. The design parameters are found to affect the evolution of the fresh and mechanical properties of SCC with recycled aggregates.

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Effect of recycled aggregates on fresh and hardened properties of self compacting concrete

Cited by 21 publications

References 14 publications

Mix Design of Recycled Coarse Aggregate Self‐Compacting Concrete Based on Orthogonal Test and Analysis of Mercury Intrusion Porosimetry

Mix Design of Recycled Coarse Aggregate Self‐Compacting Concrete Based on Orthogonal Test and Analysis of Mercury Intrusion Porosimetry

A sustainable approach in using construction and demolition waste materials in concrete

Influence of design parameters on the fresh and durable properties of self-compacting concrete with recycled aggregate

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