Influence of cold temperature on performance of concrete in J&K – Comparison studies

Abstract

Abstract Cold weather concrete construction under sub-zero temperatures presents challenging problems for the professionals involved in construction industry and are the main reason for poor development of such regions. Freezing of concrete before it gains required minimum strength at early age together with considerable retardation in setting time due to freezing temperatures are the two major problems with cold weather concreting. The professionals in Srinagar, J&K also face the above problems during winter months and needs to be addressed with cost effective measures. Although there are many accelerators present in the market the performance depends on humidity and temperature changes in the region. Accordingly, a specific study related to performance of various accelerators under the average temperature range of -7°C to 7°C (prevailing during winter) was carried out for choosing the accelerator suitable for the region. The freezing and thawing effect on hydration of cement paste, initial and final setting time and strength gain were evaluated. The 3 day, 7 day and 28 day performance was compared to a standard concrete mixture without additives which served as baseline for comparison.