影响自密实活性粉末混凝土强度因素的研究  

Study on factors affecting the strength of self-compacting reactive powder concrete

作　　者：赵玉芳[1] 卢忠远[1] 严云[1] 周顺鄂[1] 

机构地区：[1]西南科技大学材料科学与工程学院、先进建筑材料四川省重点实验室,四川绵阳621010

出　　处：《新型建筑材料》2009年第4期5-9,共5页New Building Materials

基　　金：“十一五”国家科技支撑计划重大项目(2006BAF02A24)

摘　　要：根据紧密堆积原理,通过正交试验得出基准配合比参数。在此基础上研究q值、粉煤灰取代硅灰率、水泥类型、粉煤灰类型、减水剂和钢纤维的种类及掺量等因素对自密实活性粉末混凝土流动性及抗压、抗折强度的影响。研究表明,q值、减水剂及钢纤维的种类和掺量是影响强度的主要因素。当q值为0.25、KS-JS50型聚羧酸减水剂掺量为胶凝材料质量的2.1%、钢纤维A体积掺量为3%时,可配制坍落度在255mm以上,标准养护条件下28d抗压、抗折强度分别超过190、50MPa的自密实活性粉末混凝土。Based on the dense-packing theory,the basic mix proportion was attained by orthogonal experlment.Then influence of q value, replacement rate of fly ash to silica fume,type of cement and fly ash,type and quantity of superplasticizer and steel fiber on the fluidity,compressive strength and flexural strength of self-compacting reactive powder concrete were researched. The test results show that q value,type and quantity of superplasticizer and steel fiber are key factors affecting the strength. When q value is 0.25,the dosage of polycarboxylic superplasticizer KS-JSS0 is 2.1% of the cementing material mass and volume amount of steel fibre A is 3%,self-compacting reactive powder concrete can be obtained with slump constant over 255 ram,compressive and flexural strength exceed 190 MPa and 50 MPa respectively under standard curing for 28 d.

关 键 词：活性粉末混凝土 自密实混凝土 高效减水剂 钢纤维 

分 类 号：TU528[建筑科学—建筑技术科学]