养护制度对超高强水泥基材料水化的影响  

Effect of early high temperature on hydration of super high strength cement-based materials

作　　者：张宇[1] 金祖权[1] 刘影[1] 吴运超[1] 

机构地区：[1]青岛理工大学土木工程学院,山东青岛266033

出　　处：《四川建筑科学研究》2016年第4期98-101,共4页Sichuan Building Science

基　　金：国家自然科学基金项目(51178230;51378269);铁道部科研计划项目(2014G004-F)

摘　　要：对比研究了标准养护（20℃、相对湿度≥95%）、早期高温养护（90℃蒸汽养护或水浴养护）下单掺粉煤灰或矿粉的超高强水泥基材料的抗压强度发展规律,并利用热重差热联用热分析仪（TG-DTA）定量分析了其氢氧化钙含量。结果表明：单掺粉煤灰或矿粉试样抗压强度高于纯水泥试样,3 d强度提高2.0%~14.8%,7 d强度提高8.5%~20.4%,28 d强度提高18.0%以上。90℃蒸汽养护3 d可使掺加20%矿粉或纯水泥超高强水泥基材料强度达到标准养护28 d时的强度,且其氢氧化钙量与标准养护28 d水泥基材料中的氢氧化钙量相当。90℃水浴养护3 d的超高强水泥基材料略低于标准养护28 d时的强度。粉煤灰或矿粉通过后期火山灰反应降低了超高强水泥基材料的氢氧化钙含量,且同掺量矿粉的超高强水泥基材料中的被反应的氢氧化钙量更多。The effect of two curing regimes of standard condition（ 20℃,relative humidity≥95%）,early high temperature curing（ 90℃high temperature autoclaving curing or hot water curing） on compressive strength development law of super high strength cement-based material that the single cement-fly ash or the single cement-slag complex binders. The quantitative analysis of Ca（ OH）2cement by TGDTA,which powder was prepared. Results show that： the compressive strength of the single cement-fly ash or the single cement-slag complex binders were higher than pure cement sample,which compressive strength of super high strength cement-based material increased 2. 0% ~ 14. 8%,8. 5% ~ 20. 4% and beyond 18. 0% in 3d,7d and 28 d of standard condition. The compressive strength of the single cement-slag complex binders or pure cement sample that 3d of 90℃ high temperature autoclaving curing to extend as far as28 d of standard condition,and the cement of Ca（ OH）2of the former was closely equal to the latter. The compressive strength of 3d of90℃ hot water curing slightly lower than 28 d of standard condition. The reason of cement of Ca（ OH）2of super high strength cementbased material was reduced that fly ash or slag participated in chemical reaction in the latter stage,matched with fly ash,the cement of Ca（ OH）2of the single cement-slag complex binders exhausted more.

关 键 词：超高强 早期高温养护 抗压强度 水化 热重差热联用热分析仪 

分 类 号：TU502[建筑科学—建筑技术科学]