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矿物掺合料对CRTSⅢ型板填充自密实混凝土性能影
作者：蓝波桥1，于福2，叶守杰3，刘磊4
（1.中交第三航务工程局有限公司江苏分公司，江苏 连云港 222042；2.中交一航局第二工程有限公司，山东 青岛 266000；
3.青岛市西海岸轨道交通有限公司，山东 青岛 266000；4.中交上海三航科学研究院有限公司，上海 200032）
摘要：研究了单掺粉煤灰或矿粉对CRTSⅢ型板填充自密实混凝土流动性、填充性及力学性能的影响，分析了其作用机理。结果表明：单掺粉煤灰的最佳掺量为20%，此时混凝土的扩展度为670 mm、BJ为16.3 mm、T500为6 s、H2/H1为0.9；单掺矿粉掺量从15%增大到20%时，自密实混凝土的流动性大幅度提高，扩展度由655 mm提高到710 mm、T500由4 s降至3 s，BJ由25 mm大幅度降低至12.5 mm。配制CRTSⅢ型板填充自密实混凝土时，粉煤灰掺量宜控制在20%～30%，矿粉掺量宜控制在15%～20%。
关键词：自密实混凝土；粉煤灰；矿粉；扩展度；流动性
中图分类号：TU528.041 文献标识码：A 文章编号：1001-702X（2018）11-0127-04
Study on the effect of mineral admixture on the properties of CRTS Ⅲ type plate filled self compacting concrete
LAN Boqiao1，YU Fu2，YE Shoujie3，LIU Lei4
（1.Jiangsu Branch of CCCC Third Harbor Engineering Co. Ltd.，Lianyungang 222042，China；
2.NO.2 Engineering Company Ltd. Of CCCC First Harbor Engineering Company Ltd.，Qingdao 266000，China；
3.Qingdao West Coast Rail Transit Co. Ltd.，Qingdao 266000，China；
4.CCCC Shanghai Third Harbour Engineering Academy of Science Co. Ltd.，Shanghai 200032，China）
Abstract：The effect of single doped FA or single mineral powder on the fluidity，filling and mechanical properties of a new type of CRTS Ⅲ type plate filled self compacting concrete was studied and its mechanism of action was analyzed. The results show that：the optimum mixing amount of single fly ash is 20%，the extensibility of concrete reaches 670 mm，BJ has reached 16.3 mm，T500 has reached 6 s and H2/H1 has reached 0.9；when the content of single mineral powder increased from 15% to 20%，the fluidity of self-compacting concrete increased greatly，the expansion increased from 655 mm to 710 mm and T500 decreased from 4 s to 3 s，and BJ decreased from 25 mm to 12.5 mm. When preparing CRTS Ⅲ type plate filled self compacting concrete，the content of fly ash shall be controlled at range of 20%～30% and the content of slag shall be controlled at range of 15%～20%.
Key words：self-compacting concrete，fly ash，slag，expansion degree，fluidity