原料比率及细度对二组分CSA膨胀剂膨胀性能的影响

以硫铝酸盐水泥熟料为主要原料,配以硬石膏共同粉磨制制得二组分高性能CSA混凝土膨胀剂,对不同的熟料/硬石膏比和粉磨细度对CSA膨胀剂膨胀性能的影响进行了研究。研究表明:当硫铝熟料/硬石膏=55∶45时膨胀剂膨胀性能较硫铝熟料/硬石膏=50∶50时更好。胶砂浸水养护7 d时的限制膨胀率达到0.0485%,水养7 d后干空养护至21 d其限制膨胀率仍然保持在0.02%左右。CSA膨胀剂粉磨比表面积级别为300 m2/kg左右时,其膨胀性能相比于350、400 m2/kg两个比表面积的CSA膨胀剂更好,且干空养护后期收缩小,其对材料的强度影响程度也较小。

Raw material ratio and the fineness of grinding of two component system expansive agent influent the performance of the expansion

Sulphoaluminate cement clinker for raw material,match with anhydrite mixed grinding fine get the high performance concrete expansive agent.the different clinker/anhydrite ratio and fineness of expansive agent influenced the expanding properties and the mortar strength.Research shows that:sulfur aluminum clinker:anhydrite= of the preparation of expansion agent has better expansion rate when sulfur aluminum clinker:anhydrite=55∶45 comparison to sulfur aluminum clinker:anhydrite=50∶50.Cement mortar in the water maintenance 7 days,one of the highest inflation rate for mortar is 0.048 5%,in the air in maintenance to 21 days,cement mortar restrictions still keep inflation rate at about 0.02%.Compared to 350,400 m2/kg two specific surface area level of CSA expansion agent,the grinding surface area about 300 m2/kg of CSA expansion agent inflation performance is well,and dry shrinkage rate is small.