Engineering properties of treated recycled concrete aggregate (RCA) for structural applications

Ismail, Shariman Ismadi; Ramli, Mahyuddin

doi:10.1016/j.conbuildmat.2013.03.014

Cited by 341 publications

(149 citation statements)

References 34 publications

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“…At the age of 28 days, it was noted that flexural strength of B, K, HBK 1, HBK 2, HBK 3 and HBK 4 cement mortar for water curing with constant PFA and GGBS of 10% and 40% by total volume binder weight was also found to be higher as compared to the control mortar. The observation is most probably due to the rigorous early age pozzolanic reaction between the Portlander mineral of the PFA, and the effect of fiber that can improve the characteristics of concrete or mortar with reducing shrinkage and cracking and durability by stabilization of micro cracks and decrease in permeability [17].…”

Section: Bulk Density Compressive and Flexural Strengthmentioning

confidence: 99%

Flexural behavior of the fibrous cementitious composites (FCC) containing hybrid fibres

Ramli¹,

Cheah²,

Samsudin³

2018

AIP Conference Proceedings

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Section: Bulk Density Compressive and Flexural Strengthmentioning

confidence: 99%

Flexural behavior of the fibrous cementitious composites (FCC) containing hybrid fibres

Ramli¹,

Cheah²,

Samsudin³

2018

AIP Conference Proceedings

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“…RCA exhibits lower bulk density and greater water absorption than natural aggregates because of the adhered mortar amount. Meanwhile, ITZ is the weakest section in concrete due to its less porosity and crack resistance than either hardened cement paste or aggregate [3]. Crushing procedure usually affects the amount of adhered mortar and ITZ in the concrete behavior with recycled aggregate.…”

Section: Introductionmentioning

confidence: 99%

“…The physical properties of RCA mainly determine on water absorption, adhered mortar quality, amount of adhered mortar, contaminant, chemical constituent and the interfacial transition zone (ITZ) between the natural aggregates and original cement mortar. Adhered mortar is a porous material, and its porosity rely on the originally selected ratio of water to cement (w/c) [3,4]. The high porosity of RCA is responsible for its low resistance toward mechanical and chemical actions.…”

Section: Introductionmentioning

confidence: 99%

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Engineering Behavior of Concrete with Recycled Aggregate

et al. 2016

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Abstract. Concrete is extensively used as construction materials in Malaysia. Concrete contributes suitable feature for construction industry for instance durability, adequate compressive strength, fire resistance, availability and is economic as compared to other construction materials. Depletion of natural resources and disposal of construction and demolition waste remarkably claim environmental threat. In this paper, the engineering behavior, durability, and concrete microstructure of recycled concrete aggregates (RCA) on short-term concrete properties were investigated. The studied concrete at design mix proportion of 1:0.55:2.14:2.61 (weight of cement :coarse aggregates :sand :water) used to obtain medium-high compressive strength with 20%, 50%, and 100% of RCA. Results show that for the same water/cement ratio, RCA replacement up to 50% still achieved the targeted compressive strength of 25 MPa at 28 curing days. Addition, at similar RCA replacement, the highest carbonation depth value was found at 1.03 mm which could be attributed to the pozzolanic reaction, thus led to lower carbonation resistance. Scanning electron microscopy microstructure shows that the RCA surface was porous and covered with loose particles. Moreover, the interfacial transition zone was composed of numerous small pores, micro cracks, and fissures that surround the mortar matrix. On the basis of the obtained results, recommendable mineral admixtures of RCA are necessary to enhance the quality of concrete construction.

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“…However, RCA cannot be simply applied in concrete production because its properties differ from those of natural aggregates. Several researchers [3][4][5] have found that complete or partial incorporation of RCA as a replacement for natural aggregates in recycled aggregate concrete (RAC) mixes can reduce the mechanical strength of the resulting concrete. Moreover, the presence of old cement mortar in RCA results in weakness in the interface zone between the new cement mortar and the aggregate, thereby crucially affecting the compressive strength of the RAC [6].…”

Section: Introductionmentioning

confidence: 99%

Impact Resistance of Recycled Aggregate Concrete with Single and Hybrid Fibers

Ismail

Ramli

2016

MATEC Web of Conferences

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Abstract. This paper presents a recycled aggregate concrete (RAC) mix that has been modified by adding treated recycled concrete aggregate (RCA) and various types of fiber-reinforced systems. The effectiveness of these modifications in terms of energy absorption and impact resistance was evaluated and compared with that of the corresponding regular concrete, as well as with unmodified RAC specimens. Results clearly indicate that although modification of the RAC mix with treated RCA significantly enhances the impact resistance of RAC, further diversification with additional fiber, particularly those in hybrid form, can optimize the results.

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Engineering properties of treated recycled concrete aggregate (RCA) for structural applications

Cited by 341 publications

References 34 publications

Flexural behavior of the fibrous cementitious composites (FCC) containing hybrid fibres

Flexural behavior of the fibrous cementitious composites (FCC) containing hybrid fibres

Engineering Behavior of Concrete with Recycled Aggregate

Impact Resistance of Recycled Aggregate Concrete with Single and Hybrid Fibers

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