【摘要】 为研究冻融循环和硫酸盐侵蚀作用下混凝土的碳化性能，分别通过单一碳化试验、碳化冻融交替循环试验以及碳化、冻融和硫酸盐侵蚀试验，分析其对混凝土碳化性能的影响机理和演变规律，建立碳化、冻融循环和硫酸盐侵蚀共同作用下碳化深度预测模型，并采用粒子群优化算法实现参数优化。结果表明：混凝土碳化深度与水胶比、粉煤灰掺量、聚丙烯纤维掺量、硫酸盐溶液质量分数及交替循环次数有关，在冻融先发生的情况下对混凝土的碳化性能影响更为严重，可为考虑碳化、冻融循环和硫酸盐侵蚀共同作用下混凝土工程的设计提供参考。更多还原

【Abstract】 To investigate the carbonation performance of concrete under freeze-thaw cycles and sulfate attack,tests of the single carbonation,carbonation freeze-thaw alternating cycle,and the combined tests of carbonation,freeze-thaw,and sulfate attack are conducted to analyze the impact mechanism and evolution law for the concrete carbonation performance.A carbonation depth prediction model for the combined action of carbonation,freeze-thaw,and sulfate attack is established,and the parameters are optimized by the particle swarm optimization algorithm.The research result shows that the carbonation depth of concrete is related to the water cement ratio,fly ash content,polypropylene fiber content,sulfate solution mass fraction,and number of alternating cycles.Moreover,it is more serious for the carbonation performance of concrete when freeze-thaw occurs first,which can provide reference for the design of concrete engineering considering the combined action of carbonation,freeze-thaw,and sulfate attack.更多还原