Comparison between Physical Properties of Hydraulic Cement

Abstract

Department of Public Works and Town & Country Planning (DPT) had revised the standard of specifications for material used in building structures (DPT. 1101-52 to DPT. 1106-52) to the standard of specifications for material used in building structures (DPT. 1101-64 to DPT. 1106-64) that led to the adoption of hydraulic cement as cement used in building structures in the concrete and reinforced concrete standard (DPT 1101-64). To verify some properties of hydraulic cement similar to Portland cement, DPT cooperating with Thai Cement Manufacturers Association (TCMA), Thailand Concrete Association (TCA) and International Institute of Technology (SIIT) studied the physical properties including normal consistency, setting times, compressive strength and chloride penetration testing of hydraulic cement according to TIS. 2594-2556, from six different manufacturer and compared to those of Portland cement type I (OPC1). The results show that the initial setting time and final setting time of cement paste made of hydraulic cement are less than those of cement paste made of OPC1. Compressive strength at the age of 28 days of concrete made of hydraulic cement is higher than those made of OPC1. Additionally, chloride penetration test results from both types of concrete show the similar resistance. Finally, these results were used as reference data to revise DPT 1101-64 standard. Currently, DPT distributed this improved DPT 1101-64 to DPT’s sub-department, including central and provincial, and other provincial-level government agency in every province so they can implement hydraulic cement in their construction projects in order to promote Thailand’s green-house gas reduction policy.