Effects of CO2 Curing on the High-Temperature Properties of Concrete Blocks
In order to investigate the effect of CO2 curing on the high-temperature properties, dry-mix concrete blocks were cured immediately right after casting, at room temperature of 20℃ (natural curing) and carbonation chamber with 20% CO2 concentration with 70% relative humidity (accelerated CO2 curing) for 28 days, before subjected to 300℃, 500℃, 600℃, and 800℃ high temperature exposure.The physical, mechanical and microstructure change of the heated and unheated concrete blocks were investigated.Compared with natural cured blocks, less cracks and physical damages were observed for CO2 cured blocks.Also, the reduction of mechanical strength due to high temperature exposure was found to be lower for CO2 cured blocks, in particular at 600℃.This observation is in good agreement with thermogravimetric analysis (TGA) results, which indicated that the main carbonation product (CaCO3) of the CO2 cured blocks decomposes at higher temperature range from 600 to 900℃ than that of calcium hydroxide (within 400-500℃) in the natural cured blocks.It was confirmed that the high-temperature resistance of concrete blocks cured with CO2 was apparently improved as compared with those cured naturally in air.
concrete block CO2 curing high-temperature properties calcium carbonate
Yazi Meng Weihao Tian Kim Hung Mo Tung-Chai Ling
Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of Hunan Centre for Innovative Construction Technology (CICT), Department of Civil Engineering, Faculty of En
国际会议
福州
英文
213-219
2018-11-04（万方平台首次上网日期，不代表论文的发表时间）