Synthesis Mechanisms of Sodium Metaaluminate-activated Limestone-based Cementitious Material
LIU Yuantao, WANG Yanshuai*, DONG Biqin
Guangdong Province Key Laboratory of Durability for Marine Civil Engineering, College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, Guangdong, China
Abstract: Limestone is abundant on earth.Aiming to highly utilize limestone, sodium metaaluminate (NaAlO2) and limestone powder were used to prepare cementitious material in this work. The influences of NaAlO2 contents on setting time and mechanical properties of the formed pastes were investigated. The phase composition, infrared absorption properties and microstructure of the NaAlO2 activated limestone pastes were analyzed to reveal their reaction mechanisms. The experimental results further showed that the binder had an initial setting time of 71 min when 15wt% NaAlO2was used. When adding 20wt% NaAlO2, the 3 d compressive strength of the sample reached 25.3 MPa. NaAlO2 enabled promoting the slow dissolution and recrystallization of limestone powder to form layered double hydroxide- Ca4Al2(OH)12(CO3)·5H2O. Such slow dissolution may lead to the prolongation of setting time of the formed pastes because the ions donated by excessive NaAlO2, such as Na+, Al(OH)4-, OH-, could not be consumed in time. Therefore, it is imperative to control the amount of NaAlO2 below 20% of the binder material when preparing the reasonable NaAlO2-activated limestone pastes. This study provides important guidance for the high-efficient application of calcium carbonate-based cementitious materials.
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2023, Vol. 37 
