Preparation and Performance Study of Non-shrinkage Grout for Building Gaps Construction
Portland cement,coal ash,mineral powder and other additives were used to pre-pare high-performance non-shrinkage grout.The single factor analysis method was used to screen out suitable ratios of grouting materials and mixing methods,and the rationality of the optimal ratio was verified through indicators such as flow performance,mechanical performance,expan-sion performance,and bleeding characteristics.The results showed that the optimal ratio of grouting material was 450 g cement,350 g mineral powder,200 g fly ash,280 g water,0.8 g de-foamer,0.5 g expansion agent,and 3.1 g water reducer.The mixing method is to use a star-shaped rubber sand mixer to stir at a slow speed(800 r/min)for 5 minutes(with 50%water add-ed)and a fast speed(2 500 r/min)for 5 minutes(with 50%water added).The various proper-ties of the grouting material prepared with this method can meet the requirements of the operating conditions and reduce the preparation costs.
high performancenon-shrinkagegrouting materialoptimization
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