山东大学学报 (工学版) ›› 2024, Vol. 54 ›› Issue (1): 123-130.doi: 10.6040/j.issn.1672-3961.0.2022.249
• 土木工程 • 上一篇
董伟1,2,周梦虎1*,王雪松1,薛刚1,王栋1
DONG Wei1,2, ZHOU Menghu1*, WANG Xuesong1, XUE Gang1, WANG Dong1
摘要： 为研究碳化-冻融循环作用对风积沙混凝土氯离子传输的影响,进行全风积沙混凝土经历碳化(0、14、28 d)后的冻融循环(50、100、150、200次)试验研究,根据碳化时间分为C0组、C1组、C2组。通过化学滴定法检测不同深度处混凝土中的氯离子质量分数,进而分析氯离子质量分数、分布、氯离子扩散系数以及碳化深度与时间依赖性的关系,并通过扫描电镜观察混凝土内部结构。结果表明:碳化生成的碳化产物使混凝土更加密实,能够有效抵抗氯离子的侵蚀,且碳化时间越长,抵抗氯离子侵蚀效果越明显;冻融循环增大混凝土裂缝的产生,为氯离子向内部传输提供通道;随着冻融循环次数增多,氯离子侵蚀也越严重,当冻融循环100次时,C0组氯离子侵入深度为30 mm,冻融循环150次时,所有混凝土氯离子侵入深度为30 mm;200次冻融循环条件下,C1组时间依赖性系数较C0组增加42.22%,C2组较C0组增加57.78%,较C1组增加10.94%。风积沙混凝土内部氯离子质量分数随冻融循环次数增加逐步增加,随碳化深度的增加逐步降低。
中图分类号:
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