Mechanical Properties and Service Life Prediction of Modified Concrete Attacked by Sulfate Corrosion
Mechanical Properties and Service Life Prediction of Modified Concrete Attacked by Sulfate Corrosion
复制标题
硫酸盐腐蚀改性混凝土的力学性能及使用寿命预测
DOI：
10.1155/2018/8907363
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发表时间：
2018-01-01
影响因子：
1.8
通讯作者：
Chen, Hong-li
中科院分区：
文献类型：
--
作者：
Zhang, Min;Yang, Li-min;Chen, Hong-li
在干湿循环条件下，在Na2SO4和(NH4)2SO4溶液中，对普通混凝土、掺入粉煤灰的改性混凝土和掺入粉煤灰和聚丙烯纤维的双掺混凝土进行腐蚀试验。试验设计的硫酸盐浓度为1000 g/L，测试了不同次数(0、2、4、6、8、10次)的混凝土的抗压强度和劈裂抗拉强度。结果表明，混凝土的强度在腐蚀初期增加，以后逐渐降低。外加剂显著提高了改性混凝土的抗硫酸盐侵蚀性能，而聚丙烯纤维对混凝土的防腐性能影响较小。经过10次干湿循环后，改性混凝土的抗压强度和劈裂抗拉强度分别提高了28%和19%。根据试验结果，对硫酸盐侵蚀改性混凝土的使用寿命进行了预测。
Under the condition of drying and wetting circulation, ordinary concrete, modified concrete containing fly ash, and double-admixture concrete containing fly ash and polypropylene fiber were corroded in the solution of Na2SO4 and (NH4)2SO4. The sulfate concentration of the solution was designed to be 1000 g/L. The compressive strength and splitting tensile strength of the concrete were tested after different number of drying and wetting cycles (0, 2, 4, 6, 8, and 10). The results indicate that the strength of concrete increases in the early stages of corrosion and decreases gradually later. The admixture significantly improves the resistance to sulfate erosion of the modified concrete, while polypropylene fiber plays a less important role on anticorrosion properties. When suffered 10 times of drying and wetting cycle, the compressive strength and splitting tensile strength of modified concrete increase by 28% and 19%, respectively. Based on the test results, the service life of the modified concrete corroded by sulfate was predicted.