机制砂掺量对混凝土孔结构及耐久性能的影响
Influence of manufactured sand content on the pore structure and durability of concrete
关键词：
机制砂；混凝土；水胶比；孔径分布；抗氯离子渗透性能；抗硫酸盐侵蚀性能；抗冻性能
Key words：
Manufactured sand; Concrete; Water-binder ratio; Pore size distribution; Resistance to chloride ion penetration performance; Resistance to sulfate corrosion; Frost resistance
刊期：
2025年第10期
DOI：
10.19761/j.1000-4637.2025.10.001.08
文章编号：
基金项目：
国家自然科学基金项目（U22A20229）。
作者：
赵迁乔，李伟超，王鹏刚*，付 华，董升圆
单位：
青岛理工大学 土木工程学院，山东 青岛 266525
摘要
摘 要：研究了机制砂掺量（等质量取代河砂0、25%、50%、75%、100%）和水胶比（0.53、0.46、0.40、0.36、0.33）对混凝土孔结构、抗氯离子渗透性能、抗硫酸盐侵蚀及抗冻性能的影响。结果表明：随着水胶比的增加，混凝土的抗氯离子渗透性能、抗硫酸盐侵蚀性能和抗冻性能均降低；机制砂的掺入会影响混凝土的孔结构，进而影响混凝土的耐久性能；随着机制砂掺量的增加，试件的孔隙率先降低后增加，抗氯离子渗透性能、抗硫酸盐侵蚀性能以及抗冻性能均先增加后降低。
Abstract: The effects of the content of manufactured sand (replacing river sand with equal mass of 0, 25%, 50%, 75%, 100%) and water-binder ratio (0.53, 0.46, 0.40, 0.36, 0.33) on the pore structure, resistance to chloride ion penetration performance, resistance to sulfate corrosion, and frost resistance of concrete were studied. The results show that with the increase of water-binder ratio, the resistance to chloride ion penetration performance, resistance to sulfate corrosion, and frost resistance of concrete decrease. The addition of manufactured sand can affect the pore structure of concrete, thereby affecting its durability. As the content of manufactured sand increases, the porosity of the specimen first decreases and then increases, and the resistance to chloride ion penetration performance, resistance to sulfate corrosion, and frost resistance all first increase and then decrease.
结论
（1）随着机制砂掺量的增加，试件的孔隙率先降低后增加，大孔与毛细孔占比变化趋势与孔隙率一致，但凝胶孔占比则呈先增加后降低的趋势。适当掺量的机制砂可以优化试件的孔结构。
（2）各组试件的氯离子迁移系数均随着龄期的增加而降低。随着水胶比的增加，试件的氯离子迁移系数增加，随着机制砂掺量的增加，试件的氯离子迁移系数先降低后增加。
（3）随着干湿循环次数的增加，试件的质量损失率先降后增，抗压强度耐蚀系数、相对动弹性模量先增后降。随着机制砂掺量的增加，试件的抗硫酸盐侵蚀性能先增加后降低；随着水胶比的增加，试件的抗硫酸盐侵蚀性能降低。
（4）冻融循环下，随着机制砂掺量的增加，试件的质量损失率先降后增，相对动弹性模量先增后降，抗冻性能先增加后降低。随着水胶比的降低，试件的质量损失率不断降低，抗冻性能提高。
（5）整体上，随着机制砂掺量的增加，试件的孔隙率先降低后增加，抗氯离子渗透性能、抗硫酸盐侵蚀性能以及抗冻性能均先增加后降低。因此，适量掺入机制砂可以提高混凝土的耐久性能，但过量的机制砂会增大混凝土内部孔隙，降低耐久性能，工程上需根据需求选取合适的机制砂取代河砂比例。
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引用本文
赵迁乔,李伟超,王鹏刚,等.机制砂掺量对混凝土孔结构及耐久性能的影响[J].混凝土与水泥制品,2025(10):1-8
ZHAO Q Q,LI W C,WANG P G,et al.Influence of manufactured sand content on the pore structure and durability of concrete[J].China Concrete and Cement Products,2025(10):1-8.
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