Department of Civil Engineering
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Item Comparative study of accelerated carbonation of plain cement and fly-ash concrete(Elsiever, 2017-03) Singh, Shamsher Bahadur; Bhunia, DipenduAccelerated carbonation of plain cement concrete and concrete with fly-ash replacing cement partially, is discussed in the present paper. Mechanical properties such as compressive strength, flexural strength, modulus of elasticity, durability aspects such as depth of carbonation and porosity of carbonated concrete are studied. To study the influence of water binder ratio on the above-mentioned properties, water-binder ratios of 0.35, 0.50 and 0.65 are used. It is observed that the mechanical properties of carbonated concrete have increased with the duration of carbon dioxide exposure. So did the depth of carbonation, whereas the volume of permeable voids has reduced leading to the decrease in porosity. An expression to predict the depth of carbonation of fly-ash concrete has also been developed.Item Comparative study of accelerated carbonation of plain cement and fly-ash concrete(Elsevier, 2017-03) Singh, Shamsher Bahadur; Bhunia, DipenduAccelerated carbonation of plain cement concrete and concrete with fly-ash replacing cement partially, is discussed in the present paper. Mechanical properties such as compressive strength, flexural strength, modulus of elasticity, durability aspects such as depth of carbonation and porosity of carbonated concrete are studied. To study the influence of water binder ratio on the above-mentioned properties, water-binder ratios of 0.35, 0.50 and 0.65 are used. It is observed that the mechanical properties of carbonated concrete have increased with the duration of carbon dioxide exposure. So did the depth of carbonation, whereas the volume of permeable voids has reduced leading to the decrease in porosity. An expression to predict the depth of carbonation of fly-ash concrete has also been developed.Item Mechanical strength and durability of mineral admixture concrete subjected to accelerated carbonation(Taylor & Francis, 2018-02) Bhunia, Dipendu; Singh, Shamsher BahadurBased on the experimental evaluation of blended cement concretes, its vulnerability to the potential carbonation threats have been discussed in this paper. Water binder ratios of 0.35, 0.50, and 0.65 have been adopted to study the mechanical properties and durability of the concrete mixes exposed to accelerated carbonation. Equations to predict the depth of carbonation under controlled conditions for these mixes have been established. The reliability of square root t law of diffusion to address the ingress of carbon dioxide into concrete has also been studied. Furthermore, conclusions have been drawn that the addition of fly ash and blast furnace slag as a partial replacement of cement decreased the carbonation resistance of concrete unless a water binder ratio of 0.35 is used, in which case the depth of carbonation remained almost same.Item Mechanical strength and durability of mineral admixture concrete subjected to accelerated carbonation(Taylor & Francis, 2018-02-21) Singh, Shamsher Bahadur; Bhunia, DipenduBased on the experimental evaluation of blended cement concretes, its vulnerability to the potential carbonation threats have been discussed in this paper. Water binder ratios of 0.35, 0.50, and 0.65 have been adopted to study the mechanical properties and durability of the concrete mixes exposed to accelerated carbonation. Equations to predict the depth of carbonation under controlled conditions for these mixes have been established. The reliability of square root t law of diffusion to address the ingress of carbon dioxide into concrete has also been studied. Furthermore, conclusions have been drawn that the addition of fly ash and blast furnace slag as a partial replacement of cement decreased the carbonation resistance of concrete unless a water binder ratio of 0.35 is used, in which case the depth of carbonation remained almost same.