不同腐蚀盐环境下的混凝土耐久性  

Durability of concrete under the corrosion of different salt

作　　者：王伦[1,2] 秦鸿根[1] 庞超明[1] 黄健 

机构地区：[1]东南大学材料科学与工程学院江苏省土木工程材料重点实验室,江苏南京211189 [2]江苏省交通科学研究院,江苏南京211112 [3]江苏省崇启大桥建设现场指挥部,江苏南通226600

出　　处：《混凝土》2011年第11期14-17,共4页Concrete

基　　金：江苏省崇启大桥建设现场指挥部项目(CQHT-ZG-09002);973项目(2009CB623200)

摘　　要：通过3.5%NaCl溶液、5%Na2SO4溶液、3.5%NaCl+5%Na2SO4复合溶液以及模拟海水进行干湿循环腐蚀试验,研究干湿循环条件下,不同腐蚀溶液中混凝土超声波传播速度的变化规律,通过XRD、CT分析混凝土在不同腐蚀环境下的损伤劣化机理。结果表明:干湿循环显著加速了混凝土的劣化过程;对于不配筋混凝土,氯盐的腐蚀较弱,只有干湿循环作用下F0组发生明显劣化;在氯盐和硫酸盐共存环境下,硫酸根的存在加速了氯离子对混凝土的腐蚀;模拟海水的腐蚀速度最快;F30S30组混凝土在腐蚀环境下生成物主要有钙矾石、F盐和石膏等,在氯盐和硫酸盐共同腐蚀条件下,没有发现F盐的存在。Based on taking corrosion test of concrete immersed or wetting-drying cycle in 3.5% NaCl solution,5%Na2SO4 solution,3.5% NaCl＋5%Na2SO4 compound solution and simulation of natural marine environment solution,research the ultrasonic wave velocity of concrete immersed or wetting-drying cycle in different corrosion solutions,analyze deterioration mechanism of concrete under different corrosion environment with XRD and CT.The results showed that：wet and dry cycle significantly accelerated the deterioration process of concrete;for plain concrete,chloride corrosion is weak,control specimens deteriorated only under wet and dry cycle;the sulfate accelerated the chloride corrosion of the concrete;corrosion rate of simulated sea water is fastest;the corrosion products of F30S30 are ettringite,friedel＇s salt and gypsum,in the chloride and sulfate corrosion condition,Friedel＇s salt cannot be fund.

关 键 词：混凝土 干湿循环 氯盐 复合盐 超声声速 XRD X-CT 

分 类 号：TU528.01[建筑科学—建筑技术科学]