Effects of LiAl-Layered Double Hydroxides on Early Hydration of Calcium Sulphoaluminate Cement Paste

• Published in: Journal of Wuhan University of Technology. Materials science edition Vol. 32; no. 5; pp. 1101 - 1107
• Main Author: 李海艳;管学茂;YANG Lei;LIU Songhui;ZHANG Jianwu;GUO Yanan
• Format: Journal Article
• Language: English
• Published: Wuhan Wuhan University of Technology 01.10.2017; Springer Nature B.V
• Subjects: Calcium; Cement; Cementitious Materials; Cements; Chemistry and Materials Science; Composite materials; Compressive strength; Fourier transforms; Heat measurement; Hydration; Hydroxides; Infrared spectroscopy; LDHs; Materials Science; Sulfoaluminate cement; Time compression; X-ray diffraction; 傅里叶变换红外光谱; 层状双氢氧化物; 差示扫描量热法; 扫描电子显微镜; 早期水化; 硫铝酸盐水泥; 硫铝酸钙; compressive strength; LiAl-layered double hydroxides; calcium sulphoaluminate cement paste; setting time; hydration
• ISSN: 1000-2413; 1993-0437
• DOI: 10.1007/s11595-017-1717-4

As a 3D micro-nano material, layered double hydroxides have been widely used in many fields, especially for reinforced composite materials. In this paper, Li Al-LDHs was obtained by a hydrothermal method. In order to investigate the effects of Li Al-LDHs on the early hydration of calcium sulphoaluminate（CSA） cement paste, compressive strength, setting time and hydration heat were tested while X-ray diffraction（XRD）, Fourier transform infrared spectroscopy（FT-IR）, scaning electron microscopy（SEM） and differential scanning calorimetry（DSC） analysis were employed. The results indicated that Li Al-LDHs could significantly improve the early compressive strength and shorten the setting time of calcium sulphoaluminate cement paste with 3 wt% concentration. Besides, the hydration exothermic rate within 5h was accelerated with increasing Li Al-LDHs content. Moreover, the addition of Li Al-LDHs did not result in the formation of a new phase, but increased the quantity of hydration products providing higher compressive strength, shorter setting time and denser microstructure.