Potential use of recycled construction and demolition waste aggregates for non- structural concrete applications

Jayakody, Shiran; Zimar, A.M.Z.; Ranaweera, R.A.L.M.

doi:10.4038/jnsfsr.v46i2.8421

Cited by 16 publications

(10 citation statements)

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“…The analysis of the literature shows that, among the several factors that affect the workability of concrete, water absorption is the most important one [ 31 , 55 , 62 ]. In fact, concrete workability is strictly related to the degree of substitution; high levels of substitution are related to low workability values [ 19 , 24 ].…”

Section: Resultsmentioning

confidence: 99%

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Impact of Recycled Aggregate on the Mechanical and Environmental Properties of Concrete: A Review

et al. 2022

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This review aims to present and discuss the mechanical and environmental properties of two different type of recycled aggregates obtain from construction and demolition waste (CDW): (1) Recycled Concrete Aggregates (RCA) and (2) Mixed Recycled Aggregates (MRA). In addition, the properties of the concrete in the fresh (workability, water/cement ratio) and hardened state (mechanical and durability properties), as well as the environmental impact of the concrete produced with the two types of recycled aggregates, are presented and discussed. Due to the heterogeneous composition of recycled aggregates, the concrete properties can be significantly variable. The systematic review concerns scientific papers published from 2010 to 2020 and it shows the importance of the selection process in order to obtain high quality CDW as well as of the type of recycled aggregates on concrete properties. In particular, recycled concrete aggregates show a better quality and homogeneity than mixed recycled aggregates that make them more suitable for concrete. This work presents an overview on the influence of recycled aggregate quality on the physical, mechanical and environmental properties of concrete.

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Section: Resultsmentioning

confidence: 99%

“…The easiest way to enhance concrete workability is the addition of allowed superplasticizers, even for large levels of substitution, achieving slump values close to those of the reference concrete [ 61 , 62 ].…”

Section: Resultsmentioning

confidence: 99%

Impact of Recycled Aggregate on the Mechanical and Environmental Properties of Concrete: A Review

et al. 2022

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“…As a substitute, reprocessing or recycling offerings a chance to organize construction and harmless residue. Recycling is considered as the best process as it not only reduces waste but also has many benefits such as reduction in the requirement for natural materials, decrease in transport and disposal cost, conservation of property for upcoming metropolitan expansion, improvement of ecological sustainability, and increase in job rate that should be available for handling the construction and demolition waste on traditional landfilling sites [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Effects on Compressive and Tensile Strength of Concrete by Replacement of Natural Aggregates with various Percentages of Recycled Aggregates

Noshin¹,

Aslam²,

Kanwal³

et al. 2022

murjet

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Recycled aggregate concrete is required owing to environmental conservation and actual consumption of resources. In the construction industry, for the manufacturing of concrete the demand for replacement of ordinary aggregates by recycled aggregates has increased worldwide due to the large quantity of structure and destruction waste. The objectives of this research is to evaluate the effects of strength of concrete by replacing the normal crush with different percentages such as 25%, 50%, 75% and 100% of recycled aggregates. To conduct this study, a total of 120 cylinders (60 for compression and 60 for splitting cylinder test) are casted with mixing ratio of 1:1.9:3.8 and water to cement ratio of 0.59 while curing is carried out for 7, 14, 21 and 28 days. Numerous laboratory tests are performed like workability test, compression tests and splitting tensile strength tests, to check and compare effects of the recycled aggregate concrete with reference mix M1 (0%RA). The results illustrate that the workability of concrete decreases when the quantity of recycled aggregates are increased due to more water absorbing capacity. Further, it is also perceived that the compressive strength of concrete is decreased by 3.8%, 5.7%, 12.9%, and 15.8% respectively at 28 days of curing by substituting coarse aggregates with various percentages such as 25%, 50%, 75% and 100% of recycled aggregates as compared to reference concrete mix M1 (0% RA). Similarly, splitting tensile strength is also decreased when the quantity of recycled aggregates in ordinary concrete is increased. Moreover, this reduction in workability and strength of concrete is due to more water absorbing capacity of recycled aggregates. Hence it is concluded from the research that up to 25% replacement of natural aggregate with recycled aggregates, the recycled aggregate concrete is usually preferable to reduce the cost of construction as well as improve the environmental pollution issues. It is also observed that the splitting tensile strength of a concrete batch should vary between 9 – 11% of its respective compressive strength test results.

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“…As the largest part of ordinary concrete mixes, the excessive consumption (approximately 26 billion tons per year) of nature aggregate (NA) leads to harmful environmental pollution, and a possible solution to improve the sustainability and cost-effectiveness between C&D and NA needs to be investigated [ 14 , 15 , 16 , 17 ]. The reuse of recycled concrete aggregate (RCA) and recycled asphalt pavement (RAP) aggregate in highway rehabilitation has attracted extensive attention in recent years.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Behavior Investigation of Reclaimed Asphalt Aggregate Concrete in a Cold Region

2021

Materials

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Recycled construction and demolition (C&D) waste can reduce the rebuild cost, and is environmentally friendly when recycled asphalt pavement (RAP) aggregate constitutes the main part. This paper investigated the mechanical performance of RAP concrete, and the applicability of RAP in road base layers also was discussed. Several mechanical laboratory tests were selected, including the unconfined compressive-strength, splitting-strength, and compressive-resilience modulus tests. The RAP concrete had a good road performance in a cold region, which was proved by the temperature-shrinkage test, dry-shrinkage test, freeze–thaw-cycle test, and water-stability test. Based on various cement dosages from 3.5% to 5.5% in RAP concrete mix design, three RAP aggregate replacement ratios (30%, 40%, and 50%) were selected to study the variation of mechanical properties with increasing curing time, and the optimal aggregate substitute ratio was determined. A scanning electron microscope (SEM) was used to observe the inner-structure interface between the asphalt binder and cement stone. A numerical model is presented to simulate the RAP compressive strength with respect to the effect of multiple parameters. The research results can provide a technical reference for RAP use in the reconstruction and expansion of low-grade highway projects.

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Potential use of recycled construction and demolition waste aggregates for non- structural concrete applications

Cited by 16 publications

References 0 publications

Impact of Recycled Aggregate on the Mechanical and Environmental Properties of Concrete: A Review

Impact of Recycled Aggregate on the Mechanical and Environmental Properties of Concrete: A Review

Effects on Compressive and Tensile Strength of Concrete by Replacement of Natural Aggregates with various Percentages of Recycled Aggregates

Mechanical Behavior Investigation of Reclaimed Asphalt Aggregate Concrete in a Cold Region

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