湖南大学学报（自然科学版）2025，Vol.52Issue(5)：162-171,10.DOI:10.16339/j.cnki.hdxbzkb.2025057
纳米碳酸钙对聚乙烯醇纤维混凝土静动态劈裂抗拉性能的影响
Effect of Nano Calcium Carbonate on Static and Dynamic Splitting Tensile Properties of Polyvinyl Alcohol Fiber Reinforced Concrete
摘要
Abstract
Polyvinyl alcohol(PVA)fiber can inhibit the crack propagation of concrete,but the inhibition effect is limited to the micro-cracks inside the matrix and has few effects on nano-scale cracks.The impact of nano-CaCO3 on the static and dynamic splitting tensile properties of PVA fiber reinforced concrete was studied in this paper,and the strengthening mechanism was analyzed by scanning electron microscope(SEM)test.The results show that the static and dynamic splitting tensile properties of PVA fiber reinforced concrete are significantly improved when the content of nano-CaCO3 is 1.5%.When the curing time is 28 d,the content of nano-CaCO3 is 1.5%and the content of PVA fiber is 0.6%,compared with the same content of PVA fiber reinforced concrete without nano-CaCO3,the static splitting tensile strength is increased by 8.6%,and the dynamic splitting tensile strength and dissipation energy at 2.25～3.08 s-1 strain rate are increased by 11.2%and 12.4%,respectively.SEM image analysis shows that the addition of nano-CaCO3 can promote the formation of hydration products to fill the bonding interface between PVA fiber and matrix and the pores and micro-cracks inside the cement matrix,enhance the bonding degree between fiber and matrix and the crack resistance of PVA fiber,thus improving the static and dynamic splitting tensile properties of concrete materials.关键词
纳米碳酸钙/聚乙烯醇纤维/动态测试/纤维混凝土/微观结构Key words
nano calcium carbonate/polyvinyl alcohol fiber/dynamic testing/fiber reinforced concrete/microstructure分类
建筑与水利引用本文复制引用
康玉梅,李月兰,高雪,黄蔚..纳米碳酸钙对聚乙烯醇纤维混凝土静动态劈裂抗拉性能的影响[J].湖南大学学报（自然科学版）,2025,52(5):162-171,10.基金项目
国家自然科学基金资助项目(U1602232),National Natural Science Foundation of China(U1602232) （U1602232）
