粉煤灰钢纤维协同对自密实混凝土性能的影响  

Study on the influence of fly ash on the properties of steel fiber reinforced self-compacting concrete

作　　者：彭健 Peng Jian(The First Engineering Co.,Ltd.of CREC Guangzhou Group(Nanjing),Nanjing Jiangsu 210000,China)

机构地区：[1]中铁广州工程局集团(南京)第一工程有限公司,江苏南京210000

出　　处：《山西建筑》2025年第7期90-94,124,共6页Shanxi Architecture

基　　金：中铁广州局科研项目(项目编号:重点-3-2021)。

摘　　要：文章采用钢纤维和粉煤灰两个主要变量对自密实混凝土工作性能和抗压强度进行试验研究,设计了4种自密实混凝土和12种钢纤维自密实混凝土的配合比,分别测定了坍落扩展度、V型漏斗通过时间T_(v)、扩展直径达到500 mm时对应时间T_(500)、L型箱两端相对高度h_(2)/h_(1)和立方体抗压强度。试验结果表明,掺入钢纤维会使得SFRSCC的流动性、黏聚性和间隙通过性降低,而粉煤灰替代部分水泥可以使这些性能先增加后降低,最优粉煤灰替代率为20%;钢纤维对混凝土抗压强度的提升幅度有限,而粉煤灰会降低混凝土抗压强度,尤其是早期抗压强度;钢纤维和粉煤灰的协同作用可以有效改善SFRSCC的工作性能和抗压强度。In this paper,two main variables of steel fiber and fly ash were used to study the workability and mechanical properties of Self-Compacting Concrete(SCC).Four groups of SCC and twelve groups of Steel Fiber Reinforced Self-Compacting Concrete(SFRSCC)mixtures were designed.The slump flow diameter,V-funnel flow time T_(v),T_(500) flow time for the slump diameter reaching 500 mm and the relative height ratio h_(2)/h_(1) at both ends of the L-box were measured.The test results showed that addition of steel fibers can reduce the flowability,cohesion and passing ability of SFRSCC,while replacing cement with fly ash can increase these properties firstly and then decrease.The optimal replacement rate of fly ash was 20%.In addition,steel fiber slightly improved the compressive strength of concrete.However,fly ash reduced the compressive strength of concrete,especially the early compressive strength.The synergistic effect of steel fiber and fly ash can effectively improve the workability and compressive strength of SFRSCC.

关 键 词：粉煤灰 钢纤维 自密实混凝土 工作性能 抗压强度 协同作用 

分 类 号：TU528[建筑科学—建筑技术科学]