Investigation on chloride penetration in concrete mixes of different cement replacement percentages with fly ash and silica fume

Generally, the life of R.C structure is expected to be 100 years, but today's structures are failing in 30 years due to corrosion of reinforced steel. One of the major problem to concrete from environmental attack is chloride ingress which leads to corrosion of reinforcement bars further leads to decrease of its strength and service life of structure. The focus of the work is on the chloride ion concentration at different depth in non-steady diffusion. Nine concrete mixes with different percentages of supplementary cementitious materials and water to cementitious ratios of 0.3, 0.4, & 0.5 were casted and compared with convention mixes (without replacing cement). The replacing of cement with different percentages of 30%, 50% & 70% and with 5% silica fume. Strength of concrete tested for 28, 56 & 90 days. Specimens were conducted ponding test for 6 & 12 weeks of 3.5% NaCl solution. Chemical analysis is carried out for predicting chloride concentration in concrete at different depths from surface exposed NaCl specimens. (C) 2019 Elsevier Ltd. All rights reserved.