The compressive strength of sulfoaluminate cement-based grouting materials (CBGMs) cannot meet the requirement of repair and reinforcement engineering in the presence of high water-to-binder ratio (w/b) of 0.5-1.2. Using nanotechnology, the mechanical property of the CBGM paste at different ages can be improved and our previous experimental results showed that lithium aluminum layered double hydroxides (LiAl-LDHs) with nanostructure can significantly increase the compressive strength of CBGM paste. In addition to the characteristics of nanomaterials, the performance of nanomaterials is also related to w/b of paste. In this work, the effect of w/b ratio on the compressive strength, hydration process, and products of calcium sulphoaluminate cement (CSA) CBGMs with and without LiAl-LDH was studied. Results indicate that with the increase of w/b from 0.6 to 1.0, the growth rate of compressive strength of CBGM paste with LiAl-LDH enhanced. Moreover, LiAl-LDH enhanced total hydration heat more effectively at a higher w/b and as the w/b increased from 0.6 to 1.0, the growth rate of hydration product boosted, which is the reason why the enhancement ratio of compressive strength of the paste was larger at high w/b.

在高水灰比（w / b）为0.5-1.2的情况下，硫铝酸盐水泥基灌浆材料（CBGM）的抗压强度不能满足维修和加固工程的要求。使用纳米技术，可以改善不同年龄的CBGM浆料的力学性能，我们先前的实验结果表明，具有纳米结构的锂铝层状双氢氧化物（LiAl-LDHs）可以显着提高CBGM浆料的抗压强度。除了纳米材料的特性之外，纳米材料的性能还与糊的w / b有关。在这项工作中，研究了w / b比对含或不含LiAl-LDH的硫铝酸钙水泥（CSA）CBGMs的抗压强度，水合过程和产物的影响。结果表明，随着w / b从0.6增加到1.0，具有LiAl-LDH的CBGM糊的抗压强度的增长率得到提高。此外，LiAl-LDH在较高的w / b下更有效地提高了总水合热量，并且随着w / b从0.6增加到1.0，水合产物的生长速度加快了，这就是为什么AlAl-LDH的抗压强度提高比例的原因。高w / b时糊状物较大。