粉煤灰品质对大体积混凝土性能的影响  

Influence of fly ash quality on mass concrete performance

作　　者：郭文康[1,2,3] 王述银[1,2,3] 

机构地区：[1]长江科学院结构与材料研究所,湖北武汉430010 [2]国家大坝安全工程技术研究中心,湖北武汉430010 [3]水利部水工程安全与病害防治技术研究中心,湖北武汉430010

出　　处：《人民长江》2012年第20期66-69,74,共5页Yangtze River

基　　金：水利部公益性行业专项经费项目(200901066)

摘　　要：粉煤灰是大体积混凝土重要的掺和料,其品质对大体积混凝土的性能有重要影响。为解决某工程大坝混凝土Ⅰ级粉煤灰供应不足的问题,探讨了用Ⅱ级粉煤灰替代Ⅰ级粉煤灰的可能性。试验表明,通过适当增加水泥用量和采用优质高效减水剂等方法,掺Ⅱ级粉煤灰同样可以获得物理力学性能和耐久性均较高且满足工程技术要求的大坝混凝土。讨论了粉煤灰品质指标影响混凝土各项性能的作用机理,提出了大坝混凝土合理使用粉煤灰的原则。As an essential mixture of mass concrete,the quality of fly ash has an important effect on performance of mass concrete.In order to address the problem of shortage of Grade I fly ash for dam construction,the possibility of Grade II fly ash as a replacement of Grade I fly ash is explored.It is verified by tests that through increasing cement content appropriately and adopting high-quality superplasticizer,excellent physical and mechanical properties and durability of the dam concrete mixed with Grade II fly ash will be obtained.We discuss the influential mechanism of fly ash on the concrete properties,and present the principle of rational application of fly ash in dam concrete.

关 键 词：粉煤灰 大坝混凝土 极限拉伸值 强度 

分 类 号：TV43[水利工程—水工结构工程]