矿物掺合料对再生混凝土抗冻性影响的试验研究.pdfVIP

学兔兔 2012年第 8期(总第 274期 ) 混 凝 土 原材料及辅助物料 Number 8 in 2012(Total No．274) Concrete MATERIAL AND ADMINICLE doi：10．3969~．issn 1002—3550．2012．08．027 矿物掺合料对再生混凝土抗冻性影响的试验研究 尹兴伟，吴相豪 (上海海事大学海洋环境工程学院，上海201306) 摘 要：研究了单掺粉煤灰、双掺石灰粉和粉煤灰在不同介质下(淡水、海水、硫酸盐溶液)对再生混凝土抗冻性能的影响，试验结果表 明：单掺粉煤灰掺量为20％或双掺石灰粉和粉煤灰比例为3：7时，可明显提高再生混凝土的抗冻性能，不同介质溶液下抗冻性能最好的为 淡水、最差的为海水。同时得出在不同掺量的粉煤灰、不同掺量的石灰粉和粉煤灰与再生混凝土抗冻性相关关系及其变化规律，可供理论 研究和工程应用参考。 关键词：再生混凝土；粉煤灰；石灰粉；氯离子渗透；冻融循环 中图分类号：TU528．041 文献标志码：A 文章编号： 1002—3550(2012)08—0090—04 Study on the influence of mineral admixtures on frost resistance of recycled concrete YINXing-wei，WUXiang-hao (CollegeofOcean andEnvironmentEngineering，ShanghaiMaritimeUniversity，Shanghai201306，China) Abstraet： The influence of fly ash and lime dust as cement replacement on frost resistance of recycled concrete in different medium such as fresh water．sea water and sulfate solution ale investigated．The experimemal results indicate that adding 20％fly ash to recycled concrete can im- prove its frost resistance，and frost resistance ofrecycled concrete mixed with fly ash and lime dust by 3：7 also call be improved．Frost resistance of recycled concrete is highest in舶sh water and lowest in sea water．Meanwhile．it shows the effect ofthe frost resistance ofrecycled concrete with differentamountoffly ashandlimedustwhichcai1providefortheory studyand engineeringapplication． Key words： recycled concrete；fly ash；lime dust；chloride penetration；freeze—thawing cycle II级粉煤灰，细度为14．8％(45 Ixrn筛余)，烧失量为5．79％；细骨 0 引言