Title : EVALUATION OF CHLORIDE ION MIGRATION RATE OF DIFFERENT CONCRETES
Authors : Bhaskar Sangoju
Publication : 8 - 10, October 2015
Volume : 1
Pages :
Price : 250
Abstract : This paper presents the experimental results of rapid chloride migration test (RCMT) for different concretes; three cements, viz.,, Ordinary Portland cement (OPC), fly ash based portland pozzolana cement (PPC) and Portland slag cement (PSC) with constant water-to-cement ratio(w/c). Concrete specimens of 100mm diameter and 200mm height cylinders have been cast; 50mm thick slices, cut from cylinders are used for RCMT test, which is carried out as per NT BUILD 492. The chloride penetration depths observed as per NT BUILD 492 on specimens of 28 and 90 days curing are: 42.9mm, 29mm and 16.7mm; 40.9mm, 17.5mm and 6.75mm, respectively for OPC, PPC and PSC concretes. The migration coefficients evaluated are found to be 31.6×10-12 m2/s, 10.3×10-12m2/s and 5.8×10-12m2/s; 23.9×10-12 m2/s, 8.0×10-12m2/s and 2.8×10- 12m2/s, respectively for OPC, PPC and PSC concretes after 28 and 90 days of curing. From the experimental results, it can be said that the chloride ion migration rate is high for OPC concrete, when compared to that of respective PPC and PSC concretes. Also, among the three selected concretes, PSC concrete showed least chloride penetration depth and migration rate.