Mechanical Properties of Concrete depending on Cooling Conditions After High Temperature Heating

作者：Kim Gyu Yong^*; Choe Gyeong Choel; Kang Yeon Woo; Lee Tae Gyu

来源：Journal of Advanced Concrete Technology, 2014, 12(3): 82-90.

DOI：10.3151/jact.12.82

Since the 1960%26apos;s, various studies have been carried out on the internal and external factors that might affect heated concrete in terms of compressive strength, elastic modulus and thermal stress. In particular, thermal properties of aggregate and cooling methods are known to have a significant influence on concrete residual mechanical properties. This study aims to assess concrete mechanical properties based on the types of aggregate and cooling methods used. The used coarse aggregate in concrete was granite, ash-clay and clay type. The circular concrete specimens of O100x200mm used in the experiment were heated to the target temperature to test the mechanical properties at a high temperature, slow cooling (room temperature) and water cooling (quenching) conditions. In conclusion, the research finding reveals that the smaller the thermal expansion of the aggregate, the higher the strain at a high temperature while the more deteriorated the mechanical characters. In addition, the lightweight aggregate concrete was greatly affected by the cooling velocity although the thermal expansion strain of aggregates as the thermal expansion of aggregates took place to a smaller extent, the strength at high temperature remained, while the mechanical properties deteriorated with cooling accelerated. In addition, light-weight aggregate concrete which ash-clay and clay aggregates is greatly affected by the cooling velocity depending on aggregate although the thermal expansion strain of the aggregates was shown to be within a similar range.

• 出版日期2014-3