Study on the Performance of Ternesite-Ye'elimite Cement at Different Curing Conditions
SHEN Yan1,2, ZHU Hangyu1, WANG Peifang1, CHEN Xi1, QIAN Jueshi3
1 College of Civil Science and Engineering, Yangzhou University, Yangzhou 225127, Jiangsu , China 2 State Key Laboratory of Green Building Materials, Beijing 100000, China 3 College of Material Science and Engineering, Chongqing University, Chongqing 400045, China
Abstract: Ternesite-ye'elimite cement is a new type of low-carbon binder in which the hydration reactivity of ternesite has a significant effect on cement properties. In this work, ternesite-ye'elimite cement was prepared by adding ion doping. The effect of curing temperature and humidity on the mechanical property, dimensional stability and hydration products of ternesite-ye'elimite cement were investigated. The results indicate that the phase composition of the clinker is close to the target mineralogical composition. The compressive strengths of cement pastes cured at 40 ℃ and 60 ℃ are much higher than those of cement pastes cured at 20 ℃. Compared with air curing, water curing provides cement pastes with higher compresive strengths apparently. Increasing curing temperature results in much higher expansion rate of mortars, but the expansion tends to be constant at later ages, which indicates that the hydration of ternesite at higher temperatures is harmless to the volume stability of ternesite-ye'elimite cement. Higher temperature can promote the ettringite formation at 3 d, but the amount of ettringite decreases in cement pastes cured at 60 ℃. After 28 d of hydration, a similar ettringite formation of cement pastes cured at different temperatures is observed. The cement pastes cured at air and water show a similar ettringite development with ongoing hydration.
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