They are one of the primary sources of CO 2 emission into the atmosphere and account for nearly 5% of the global emission. The cement industries have caused severe damage to the environment. Predictive charts were generated between the above-mentioned parameters and days of curing in water. Both these equations were applicable to all the concrete samples of this study. A linear equation was established between the initial and secondary rate of water absorption of concrete and also between the chloride ion penetration of concrete at 10–20 mm and 25–35 mm depth. The analytical relationships were developed between the above-mentioned parameters and curing age of concrete. The maximum reduction in water absorption and chloride ion penetration was observed in R2M3 (10% RSA and 7.5% MS) as compared to control concrete (R0). A significant reduction was observed in the water absorption and chloride ion penetration in concrete samples with an increase in the curing age as well as with an increase in the proportion of MS and RSA. Ten concrete samples were prepared by partially substituting cement with RSA and MS in various proportions. The effects of rice straw ash (RSA) and microsilica (MS) on durability properties (water absorption and chloride ion penetration) of M40 grade Pavement Quality Concrete (PQC) were studied.
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