Effect of micro silica on mechanical and durability properties of high volume fly ash recycled aggregate concrete (HVFA-RAC)
MetadataShow full item record
This paper presents the effect of different micro-silica (MS) contents of 5, 10 and 15 wt.% as partial replacement of cement on mechanical and durability properties of high volume fly ash - recycled aggregate concretes (HVFA-RAC) containing 50% class F fly ash (FA) and 35% recycled coarse aggregate (RCA) as partial replacement of cement and natural coarse aggregate (NCA), respectively. The measured mechanical and durability properties are compressive strength, indirect tensile strength, elastic modulus, drying shrinkage, water sorptivity and hloride permeability. The effects of different curing ages of 7, 28, 56 and 91 days on above properties are also considered in this study. The results show that the addition of MS up to 10% improved the early age (7 days) strength properties of HVFA-RAC, however, at later ages (e.g. 28-91 days) the above mechanical properties are improved for all MS contents. The 5% MS exhibited the best performance among all MS contents for all mechanical properties of HVFA-RAC. In the case of measured durability properties, mix results are obtained, where 10% and 5% MS exhibited the lowest sorptivity and drying shrinkage, respectively at all ages. However, in the case of chloride ion permeability a decreasing trend is observed with increase in MS contents and curing ages. Strong correlations of indirect tensile strength and modulus of elasticity with square root of compressive strength are also observed in HVFA-RAC. Nevertheless, it is established in this study that MS contributes to the sustainability of HVFA-RAC significantly by improving the mechanical and durability properties of concrete containing 50% less cement and 35% less natural coarse aggregates.
Showing items related by title, author, creator and subject.
Mechanical properties and durability of high volume fly ash concrete reinforced with calcium carbonate nano particlesShaikh, Faiz; Supit (2015)The effects of calcium carbonate (CaCO3) nanoparticles on the mechanical properties and durability of high-volume fly ash (HVFA) concretes containing 40 and 60 wt% fly ash as the partial replacement of cement are evaluated ...
Mechanical and durability properties of high volume fly ash (HVFA) concrete containing calcium carbonate (CaCO3) nanoparticlesShaikh, Faiz; Supit, S. (2014)The effects of CaCO3 nanoparticles on compressive strength and durability properties of high volume fly ash (HVFA) concretes containing 40% and 60% fly ash as partial replacement of cement are evaluated in this study. The ...
Shaikh, Faiz; Nguyen, H. (2013)The incorporation of mixed construction and demolition (C&D) wastes as a substitute to natural aggregates (NA) has many economic and environmental benefits. In this paper, the results of an investigation on the effect of ...