山东大学学报 (工学版) ›› 2024, Vol. 54 ›› Issue (4): 115-121.doi: 10.6040/j.issn.1672-3961.0.2023.117
董伟1,2,朱相茹1*,王雪松1,周梦虎1
DONG Wei1,2, ZHU Xiangru1*, WANG Xuesong1, ZHOU Menghu1
摘要： 为探究干湿循环作用下风积沙混凝土内部微观结构的演变规律,试验采用河砂质量的0、25%、50%、75%及100%的风积沙替代河砂制备混凝土,在NaCl质量分数为3.5%的溶液中进行干湿循环试验。利用扫描电镜、核磁共振等技术对氯盐干湿循环作用下风积沙混凝土(aeolian sand concrete, ASC)的微观结构及氯离子侵蚀机理进行分析。结果表明:随风积沙质量分数增大,ASC内部自由氯离子质量分数先减小后增大;随侵蚀深度的增加,自由氯离子质量分数逐渐减小;氯盐干湿循环使ASC内部产生了大量盐结晶,结晶压力造成ASC内部孔结构劣化,核磁共振T2图谱不断右移,其中采用河砂质量的100%的风积沙替代河砂的混凝土(A100)在氯盐干湿循环过程中损伤最严重。
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