复掺掺合料进水塔混凝土抗冻融性机理研究  

Study on the Anti-Freeze-Thaw Resistance Mechanism of the Water-Intake Tower Concrete Mixed with Admixtures

作　　者：郑晓东[1] 陈子寒 郭书亮[2] ZHENG Xiao-dong;CHEN Zi-han;GUO Shu-liang(Hebei University of Engineering,Handan 056000,Hebei,China;Chongqing Vocational and Technical College of Industry and Trade,Chongqing 408000,China)

机构地区：[1]河北工程大学,河北邯郸056000 [2]重庆工贸职业技术学院,重庆408000

出　　处：《水利科技与经济》2021年第12期83-90,共8页Water Conservancy Science and Technology and Economy

摘　　要：我国北方地区水工混凝土结构存在明显的冻病害现象,以张家口闪电河水库进水塔为背景,对进水塔混凝土进行复掺粉煤灰和尾矿砂试验。试验主要用粉煤灰替代水泥,尾矿砂替代细骨料,一共设计4种不同掺量的配合比,根据不同配比进行抗冻融试验和抗压强度试验,分析复掺掺合料进水塔混凝土抗冻融机理,提出复掺掺合料的最优掺量。试验表明,在单掺混凝土抗压强度试验时,混凝土强度最高时粉煤灰掺量为20%,尾矿砂混凝土强度最高是在尾矿砂掺量为50%的时候;复掺混凝土当复掺10%粉煤灰和25%的尾矿砂时强度最高;进行冻融循环试验后,根据对质量损失率和相对动弹性模量分析得出,复掺10%粉煤灰和25%尾矿砂的混凝土受冻融影响最小。There are obvious freezing diseases in hydraulic concrete structures in northern of China.Taking the intake tower of Zhangjiakou Shandianhe reservoir as the background,this paper has carried out the test of mixing fly ash and tailing sand on the intake tower concrete,and the test is mainly replaced by fly ash.Cement and tailings sand replace fine aggregates.A total of four different mixing ratios are designed.The freeze-thaw resistance test and compressive strength test are carried out according to the different ratios,and the freeze-thaw resistance mechanism of the mixed admixture intake tower concrete is analyzed,and putting forward the optimal dosage of compound admixture.The test shows that in the compressive strength test of the single-mixed concrete,the fly ash content is 20%when the concrete strength is the highest,and the tailings sand concrete strength is the highest when the tailings sand content is 50%;when the mixed concrete is mixed 10%Fly ash and 25%tailing sand have the highest strength;after the freeze-thaw cycle test,according to the analysis of the mass loss rate and relative dynamic elastic modulus,the compound mixed with 10%fly ash and 25%tailing sand concrete is least affected by freezing and thawing.

关 键 词：进水塔混凝土 冻融循环 粉煤灰 尾矿砂 

分 类 号：TU528[建筑科学—建筑技术科学]