Experimental studies on utilization of coarse and finer fractions of recycled concrete aggregates in self compacting concrete mixes

Kumar, Barun; Ananthan, H.; Balaji, K V

doi:10.1016/j.jobe.2016.11.013

Cited by 65 publications

(17 citation statements)

References 12 publications

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“…This is contributed with the porosity of RCA which absorb more water and reduce the flowability. This result is in agreement with other research results [16,17,51]. Similarly, the slump flow diameter of RCA100 decreased to 520 mm in spite of increased amount of superplasticizer.…”

Section: Workability and Densitysupporting

confidence: 93%

Influence of Surface Treatment of Recycled Aggregates on Mechanical Properties and Bond Strength of Self-Compacting Concrete

et al. 2019

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In the last decade there has been a massive growth for development of concrete infrastructures all around the world. Take into account environmental concerns, concrete technology should direct efforts toward assuring development and fabrication of sustainable and resilient concrete. For this purpose, incorporation of recycled concrete aggregate in concrete products particularly self-compacting concrete (SCC) for structural and non-structural application would be significant achievement. In this study the fresh and hardened properties of SCC prepared by substituting natural aggregates (NA) with recycled coarse aggregates (RCA). In addition, bonding behaviour of reinforced RCA-SCC for structural application was investigated. Moreover, surface treatment of RCA using lithium silicate solution was proposed to investigate its feasibility to improve the fresh and hardened properties of SCC as well as its bonding strength. The mechanical properties including compressive strength, tensile strength and elastic modulus of SCC mixes using untreated RCA and treated RCA (TRCA) were investigated. The results showed an improvement in performance of SCC mixes made with TRCA in compare with the untreated samples. The bond behaviour between SCC made with RCA and steel reinforcement was studied and the relationship between the brittleness and bonding of SCC mixes using untreated RCA and TRCA determined. The effect of surface treatment on the interfacial transition zone (ITZ) between adhered mortar and RCA studied using scanning electron microscope (SEM). It was determined that the treatment of RCA improved the bond at the ITZ through densification. The results gave experimental evidence of the suitability of RCA-SCC for structural use and application in reinforced concrete.

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Section: Workability and Densitysupporting

confidence: 93%

Influence of Surface Treatment of Recycled Aggregates on Mechanical Properties and Bond Strength of Self-Compacting Concrete

et al. 2019

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“…Brand et al [5] indicated that the moisture content in coarse RCA has a contradictory impact on the fluidity of RAC. Kumar et al [6] suggested that the workability of RAC is much less affected by the addition of 20 wt.% coarse and fine RCA if the added RCA is in saturated and surface dry condition. In addition, similar findings have also been confirmed by several other studies, which have indicated that the incorporation of RCA has little effect on the workability of RAC provided that there is no water consumption by the added RCA [7,8,9,10,11,12].…”

Section: Introductionmentioning

confidence: 99%

Rheological and Mechanical Properties of Ultra-High-Performance Concrete Containing Fine Recycled Concrete Aggregates

Huang

Ding

2019

Materials

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The manufacturing process of ultra-high-performance concrete (UHPC) leads to a considerable amount of greenhouse gas emissions, which contribute to global warming. Using recycled concrete aggregates (RCA) to replace natural sand helps to reduce natural resources and energy consumption. In this study, the feasibility of manufacturing UHPC with fine RCA was investigated for the sustainable development of construction materials industry. We aimed to study the rheological properties, autogenous shrinkage, mechanical properties, and pore structure of UHPC with different amounts of RCA. The natural aggregate content was replaced with fine RCA at rates of 0, 20, 40, 60, 80, and 100 wt.%, and the packing density of the mixed fine aggregates in this study was estimated using a linear packing model. It was found that (1) the workability, mechanical properties, and deformation behaviour of UHPC with fine RCA were comparable to or even higher than those of UHPC made of high-quality aggregates; (2) the optimal replacement rate of fine RCA was in the range of 40–60 wt.%, considering the mechanical properties and deformation behaviour of UHPC; (3) the tensile strength, flexural strength, and Young’s modulus of UHPC increased by 6.18%, 12.82%, and 3.40%, respectively, when the replacement rate of fine RCA was 60 wt.%; (4) the maximum packing density of mixed fine aggregates presented a monotonic decreasing trend as the replacement percentage of fine RCA increased. These findings help to encourage and further promote the utilisation of RCA to produce UHPC.

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“…In this sense, numerous studies have analysed the behaviour according to different mix proportions [11,15,16], suggesting a lower compressive strength for higher percentages of replacement of the natural aggregate, as well as greater strain and a lower modulus of elasticity. However, other studies suggest that the mechanical performance of recycled concrete is similar to that made with natural aggregates, even superior in terms of its compressive strength [17] or tensile performance [18,19].…”

Section: Introductionmentioning

confidence: 99%

Compression and Strain Predictive Models in Non-Structural Recycled Concretes Made from Construction and Demolition Wastes

et al. 2021

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This work aims to investigate different predictive models for estimating the unconfined compressive strength and the maximum peak strain of non-structural recycled concretes made up by ceramic and concrete wastes. The extensive experimental campaign carried out during this research includes granulometric analysis, physical and chemical analysis, and compression tests along with the use of the 3D digital image correlation as a method to estimate the maximum peak strain. The results obtained show that it is possible to accurately estimate the unconfined compressive strength for both types of concretes, as well as the maximum peak strain of concretes made up by ceramic waste. The peak strain for mixtures with concrete waste shows lower correlation values.

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Experimental studies on utilization of coarse and finer fractions of recycled concrete aggregates in self compacting concrete mixes

Cited by 65 publications

References 12 publications

Influence of Surface Treatment of Recycled Aggregates on Mechanical Properties and Bond Strength of Self-Compacting Concrete

Influence of Surface Treatment of Recycled Aggregates on Mechanical Properties and Bond Strength of Self-Compacting Concrete

Rheological and Mechanical Properties of Ultra-High-Performance Concrete Containing Fine Recycled Concrete Aggregates

Compression and Strain Predictive Models in Non-Structural Recycled Concretes Made from Construction and Demolition Wastes

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