二次高温养护对高强混凝土抗Cl^-渗透性的影响  

Effect of Steam-Autoclaved Curing on Chloride Permeability of High Strength Concrete

作　　者：刘东升[1] 朱建舟 谭克锋[1] 

机构地区：[1]西南科技大学材料科学与工程学院,四川绵阳621010 [2]上海中技桩业股份有限公司,上海200434

出　　处：《西南科技大学学报》2014年第3期54-58,63,共6页Journal of Southwest University of Science and Technology

基　　金：四川省科学基金项目(10zd1104)

摘　　要：利用氯离子快速渗透法(RCM)研究了普通蒸汽养护后(80℃,0.1 MPa)再进行压蒸(180℃,1 MPa)养护,即二次高温养护,对不同胶凝材料体系的高强混凝土抗Cl-渗透性的影响。结果表明:对于纯水泥混凝土,与标养相比,"蒸养-压蒸"养护使混凝土抗Cl-渗透性能劣化。掺入粉煤灰、矿粉以及硅灰以等比例取代水泥时,"蒸养-压蒸"都较为充分地激发了上述混合材的火山灰活性,但不同掺合料对"蒸养-压蒸"后高强混凝土抗Cl-渗透性能影响差别较大。XRD和SEM研究表明上述结果的产生与高温下水化产物的种类和分布有关。Rapid choloride migration test（RCMT） was used to investigate the influence of curing methods and mineral admixtures on chloride ingress resistance of high strength concrete. The results indicate that steam curing and autoclaving curing,especially autoclaving curing,considerably aggravated the chloride penetration through pure cement concrete when compared with normal curing. Incorporating silica fume can improve the chloride ingress resistance of steam curing concrete but degrades autoclaving curing concrete. Adding fly ash with low pozzolanic activity can increase chloride ingress resistance of autoclaving curing concrete,while chloride penetration resistance of steam curing concrete becomes lower. The measure of multi-elements mineral admixtures mixing is propitious to improving the chloride ingress resistance of concrete compared with pure cement concrete under same curing conditions. Results above was analyzed by XRD and SEM.

关 键 词：养护方式 电通量 矿物掺合料 氯离子渗透性 混凝土 

分 类 号：TU528.31[建筑科学—建筑技术科学]