减水剂品种对水泥浆体的收缩性能研究

Study of Effects of Water Reducer Type on Drying Shrinkage of Cement Paste

通过试验研究了不同类型的高性能减水剂对水泥净浆干燥收缩性能的影响。主要研究了三种不同条件下减水剂品种及掺量对水泥净浆干燥收缩的影响:(1)相同水灰比条件下即保持单位浆体体积含量不变,减水剂掺量对水泥浆体收缩性能的影响;(2)相同水灰比条件下即保持浆体体积含量不变,不同减水剂品种在相同掺量下对收缩性能的影响;(3)相同扩展度下,不同水灰比即改变浆体体积含量,减水剂种类、掺量对干燥收缩性能的影响。试验结果显示:不同类型的高效减水剂在不同条件下对水泥净浆的干燥收缩性能有所不同。

Experimental study was carried out of effects of different types of high performance water reducer on drying shrinkage of cement paste. Effects of different types and dosages of water reducer on cement paste were studied under three different conditions： first, effects of water reducer dosage on shrinkage of cement paste under the condition of same water cement ratio, i.e,, to keep volume contender of unit cement paste constant; second, effects of different type but same addition of water reducer on shrinkage of cement paste under the condition of same water cement ratio, i.e., to keep volume contender of unit cement paste constant; third, effects of type and dosage of water reducer on drying shrinkage of cement paste under the condition of same fluidity but different water cement ratio, i.e., to change volume contender of cement paste. Testing results revealed that different high performance water reducers influenced drying shrinkage of cement paste differently under different conditions..