一种无氯复合水泥助磨剂试验研究

Experimental Study on a Chlorine Free Composite Cement Grinding Aid

本文对一种无氯复合水泥助磨剂进行研究,该助磨剂不含有腐蚀设备的卤素离子,可以有效提升水泥粉磨效率,改善水泥颗粒分布并增加水泥强度。选用新型改性醇胺作为助磨剂的基体材料,和3种常用原材料加上辅料复配助磨剂进行小磨试验,评价助磨剂性能,分析各组分的影响,运用极差分析确定每种材料最优配比,采用SEM对水泥水化产物进行表征。与空白样进行对比,该助磨剂对水泥性能提升明显,其中水泥45μm筛余值降低了24.0%,3 d抗压强度提高3.8 MPa,28 d抗压强度提高5.4 MPa,并且使用该助磨剂的水泥在混凝土应用中工作性能好,强度更高,耐久性更佳。

A chlorine free composite cement grinding aid was studied.The grinding aid does not contain halogen ions which corrode the equipment.It can effectively improve the grinding efficiency of cement,improve the distribution of cement particles and enhance the strength of cement.The new modified alcohol amine was selected as the matrix material of grinding aids,and three kinds of common raw materials with auxiliary materials were used to make small grinding test.The performance of grinding aids was evaluated,and the influence of each component was analyzed.The optimal ratio of each material was determined by range analysis,and the hydration products of cement were characterized by SEM.Compared with the blank sample,the performance of cement is significantly improved by the grinding aid,in which the cement 45μm sieve residue decreases by 24.0%,3 d compressive strength increases by 3.8 MPa,and 28 d compressive strength increases by 5.4 MPa.And the cement using the grinding aid has better working performance,higher strength and better durability in concrete application.