In this study, LiAl-layered double hydroxides Lithium aluminum hydrotalcite (LiAl-LDH) with different specific surface area were prepared by the separate nucleation and aging steps (SNAS) method and then were employed to prepare calcium sulfoaluminate cement-based grouting material (CBGM) paste. The influence of LiAl-LDH slurries on fresh and hardened properties of the CBGM paste was investigated in terms of fluidity, stability, setting time, and compressive strength. Additionally, the hydration process and hydration products of the CBGM paste were characterized by hydration heat, X-ray diffraction, differential thermal analysis–thermogravimetry, and Fourier transform infrared analyses. The acquired results illustrated that LiAl-LDH with larger specific surface area led to a faster hydration rate at early age, a lower fluidity, a shorter setting time, and a higher stability. Furthermore, due to the crystal nucleation effect, the addition of LiAl-LDH slurries did not cause a new phase to form but changed the morphology and increased the amount of hydration products, yielding higher compressive strength.

本研究采用成核和时效步骤（SNAS）分别制备了比表面积不同的LiAl层状双氢氧化物锂铝水滑石（LiAl-LDH），然后用于制备硫铝酸钙水泥基灌浆材料（CBGM）。 ）粘贴。从流动性，稳定性，凝固时间和抗压强度方面研究了LiAl-LDH浆料对CBGM浆料的新鲜和硬化性能的影响。此外，CBGM糊的水合过程和水合产物还通过水合热，X射线衍射，差热分析-热重分析和傅里叶变换红外分析来表征。获得的结果表明，比表面积较大的LiAl-LDH导致早期的水合速度更快，流动性较低，凝结时间更短，稳定性更高。此外，由于晶体成核作用，添加LiAl-LDH浆料不会引起新相的形成，但会改变形态并增加水合产物的量，从而产生更高的抗压强度。