Temperature Control and Monitoring For Mass Concrete in Raft under Hot Weather Condition – An Indian Case Study

Abstract

The temperature difference between inner and outer zones of mass concrete possess a great risk and may induce stresses leading to cracking in the concrete. In order to avoid the problems associated with temperature induced stresses in mass concrete, temperature control and monitoring is essential. This paper presents a case study of raft constructed for a 19 storey residential tower at Delhi in India.  In this study, various temperature control methods were adopted at site during material selection, concrete mixing, transporting, casting and curing. Based on recorded data it was found that adopted measures helped in control the peak temperature of the concrete as well as the temperature differences in different sections of the concrete. In total, ten thermal sensors were used in the study. Out of which three sensors were embedded at the top, three at the middle and three at the bottom of the foundation. Apart from these, one thermal sensor was kept in ambient temperature conditions for comparison purpose. In the present study, the temperature differences between top, middle and bottom of the concrete is primarily focused. Maximum temperature observed in concrete was 65.50 °C and maximum temperature difference between top and core of concrete was 14.40 °C, both are within specified limits of 70 °C and 20 °C respectively as per the Indian standard codal provisions.