【摘要】 通过对钢筋混凝土试件进行电化学除氯及冻融循环试验,研究了除氯时间、粉煤灰掺量、减水剂、引气剂等因素对冻融后损伤变化规律的影响。研究表明:随冻融循环次数增加,各试件呈现出较明显的冻融损伤厚度增大趋势;经200次冻融循环,电化学除氯28d的混凝土试件劣化最严重,200次后经除氯14d、28d的混凝土试件损伤层发展迅速;粉煤灰的加入降低了混凝土的抗冻性能,减水剂、引气剂则提高了试件的抗冻性能。更多还原

【Abstract】 In this paper, the electrochemical chloride removal and freeze-thaw cycling tests of reinforced concrete specimens are carried out. Effects of chlorine removal time, fly ash content, water reducing agent and air entraining agent on the damage change after freeze-thaw are studied. Results show that the freeze-thaw damage of concrete specimens increase obviously with the increasing of freeze-thaw cycles. The concrete specimens with electrochemical chlorine removal for 28 days deteriorate most serious after 200 freeze-thaw cycles, and the damage layer of concrete specimens with chlorine removal for 14 days and 28 days develop rapidly. The frost resistance ofconcrete is deteriorated because of the addition of fly ash, while the addition of water reducer and air-entraining agent improve the frost resistance of concrete specimens.更多还原