混合腐蚀环境下改性混凝土的力学性能

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混合腐蚀环境下改性混凝土的力学性能
郭进军，韩菊红，卢燕
(郑州大学水利与环境学院，河南郑州450000)
摘要：分别配制包含SOi一，Cr，NH 和Mg抖，C1一，NH 的两组高浓度混合腐蚀溶液，对普通混
凝土、掺粉煤灰混凝土、掺聚丙烯纤维混凝土和双掺(聚丙烯纤维和粉煤灰)混凝土试件进行快速
腐蚀试验，得到了30，60，9O，150 d下各类混凝土的抗压强度、劈拉强度与弹性模量的变化规律．结
果表明：硫酸根混合溶液中腐蚀离子之间呈现相互削弱的关系，延缓了混凝土的损伤过程；而铗离
子混合溶液中腐蚀介质则表现出相互叠加的效应，加速了混凝土的侵蚀进程．在混凝土中掺入粉
煤灰和聚丙烯纤维进行改性能够显著提高混凝土的抗腐蚀性能，其腐蚀后劈拉强度可以提高
25 ～57％．改性混凝土成功应用于城市污水处理厂改造工程中，防腐性能优良，经济效益显著．
关键词：混凝土；混合腐蚀溶液；抗压强度；劈拉强度；弹性模量
中图分类号：TU528．01 文献标志码：A doi：10．3969／j．issn．1007—9629．2013．02．027
M echanical Properties of M odified Concrete Exposed to
Composite Corrosive Environment
GUOJin-jUn，
(School of Water Conservancy& Environment
HAN Ju—hong． LUYan
Engineering，Zhengzhou University，Zhengzhou 450000，China)
Abstract：Accelerated corroding experiments of ordinary concrete and modified concrete(fly ash concrete，
polypropylene fibre concrete and concrete mixed with fly ash and polypropylene fibre)immersed in two
group of high concentrated mixed corrosive solutions were carried out．The two mixed corrosive solutions
consist of So 一，C1一，NH and Mg。，C1一，NH respectively．Change tendency of compressive strength，
splitting tensile strength and elastic modulus of modified concrete varying with corrosive age(30，60，90
and 1 5 O d) were obtained． The results show that corrosive effects of ions weaken each other in sulfate
mixed solution and alleviate the damage process of concrete．On the contrary，they will aggravate in mag—
nesium mixed solution and accelerate the erosion process．Resisting corrosion property of concrete is im—
proved markedly by means of mixed in fly ash and polypropylene fibre，which results in 25 一57％ in—
crease of corroded splitting tensile strength compared to ordinary concrete．The modified concrete was SUC—
cessfully applied in renovation proj ect of municipal sewage plant with excellent anti—corrosion performance
and significant economic benefit． ’
Key words：concrete；composite corrosive solution；compressive strength；splitting tensile strength；elas—
tic modutuS
混凝土结构由于各种腐蚀介质所导致的损伤劣
化已成为结构耐久性问题中非常重要的课题．腐蚀
环境主要分布在市政工程、海岸结构工程、水利港口
工程、交通工程及广阔的盐碱地带等．如青海盐湖平
均硫酸根离子(Soi一)质量浓度为22．3 g／L，氯离子
(C1一)质量浓度为204 g／L，镁离子(Mg )质量浓