Title : DURABILITY PERFORMANCE OF SLAG AS A SUPPLEMENTARY CEMENTING MATERIAL
Authors : B.S.Dhanya, Manu Santhanam and Nithish Bharath Kumar B
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Price : 250
Abstract : One of the major causes of deterioration of reinforced concrete structures is corrosion. Corrosion of reinforcement in concrete structures can happen primarily because of chloride ingress or carbonation. The present paper reports a study on the influence of slag on different durability parameters of concrete that are used to assess the durability of concrete in these two conditions. The durability tests included in the programme are Surface Resistivity Test (Wenner 4-Probe method), Rapid Chloride Permeability Test, Sorptivity Test, Accelerated Carbonation Test and Rapid Migration Test. Two sets of mixes were studied. The mix proportions were identified from the prescriptive specifications available in BS 8500 Part1 for XS and XC categories respectively. For both categories, three replacement levels of slags - 15, 30 and 50 % were studied. The relative service life of OPC and slag mixes were calculated using Duracrete model both in terms of chloride induced corrosion and carbonation induced corrosion. The results underline the potential of slag in chloride laden environments. However, for the carbonation environments, the performance of slag, especially at higher replacement levels, does not match that of OPC.