防冻型水泥基无收缩灌浆材料的实验研究

Experimental study on the anti-freezing cement-based non-shrink grouting material

通过在普通水泥基无收缩灌浆材料中设计添加特种材料、外加剂等制备了防冻型水泥基灌浆材料,研究了其在低温环境下的新拌性能和力学性能。结果表明,4#配比,通过添加20 g增强剂后,在-5℃环境下,初始流动度为329 mm,3 d早期强度达到44.5 MPa,远远超过受冻的临界强度,可以满足低温(-5℃)下施工需要;7#配比,同时添加10 g外加剂2和20 g增强剂后,在-10℃环境下,初始流动度为330 mm,3 d强度达到25.6 MPa,按冬季施工规定进行养护,注意施工后的保暖,在-10℃外界环境此配比能够满足施工要求。

In this paper, through adding special materials and admixtures ~to the ordinary cement-based non-shrink grouting materials, anti-freezing cement-based grouting material is prepared. The author studies the changes df fresh properties（fluidity etc.） and of mechanical properties of antifreeze cementitious grout under the low temperature. In this experimental ratio 4, enhanced by the addition of reinforcing agent 20 grams,at C environment,initial fluidity is 329mm,the 3 days early strength reaches 44.5 MPa,far beyond the critical frozen strength the construction requirement under low temperature （-5 ℃）：in experimental ratio 7,while adding 10 grams of admixture 2,20 grams of reinforcing agent,at -10 ℃ environment,the initial fluidity is 330 ram, 3 days strength reaches 25.6 MPa. If curing according to the winter construction regulationS, pay attention to the thermal insulation after construction,this ratio can meet the construction requirements under -10 ℃ environment.