硅酸盐通报2024，Vol.43Issue(5)：1859-1866,8.
盐侵冻融循环下聚乙烯醇纤维混凝土孔结构分形特征
Pore Structure Fractal Characteristics of PVA Fiber Concrete under Salt Erosion and Freeze-Thaw Cycle
摘要
Abstract
To study the effect of polyvinyl alcohol(PVA)fibers on pore structure of concrete and its connection with frost resistance performance,the microscopic pore structure of PVA fiber concrete under the action of freeze-thaw cycle was tested by nuclear magnetic resonance(NMR)technology,the NMR T2 spectrum and the change rule of pore distribution were analysized,and the pore fractal characteristics were explored based on fractal theory to reveal the relationship between the pore structure of PVA fiber concrete under the action of freeze-thaw cycle and fractal dimension.The relationship between pore structure and fractal dimension of PVA fiber concrete under the freeze-thaw cycle was revealed.The results show that PVA fiber concrete shows better frost resistance in the pre-freeze-thaw cycle period.The number and percentage of medium pores(100＜r≤1 000 nm)and large pores(r＞1 000 nm)increase,which weaken the frost resistance of PVA fiber concrete.The PVA fiber concrete has a certain fractal characteristic,and the fractal dimension Dmax increases before five times freeze-thaw cycles and decreases with the increase of freeze-thaw cycles times.关键词
冻融循环/聚乙烯醇纤维混凝土/孔结构/核磁共振/分形维数/抗冻性能Key words
freeze-thaw cycle/PVA fiber concrete/pore structure/nuclear magnetic resonance/fractal dimension/frost resistance分类
通用工业技术引用本文复制引用
吴浩,薛维培,王中建..盐侵冻融循环下聚乙烯醇纤维混凝土孔结构分形特征[J].硅酸盐通报,2024,43(5):1859-1866,8.基金项目
国家自然科学基金青年科学基金(52308228) （52308228）
安徽省自然科学基金面上项目(2208085ME146) （2208085ME146）
教育部"春晖计划"合作科研项目(HZKY20220204) （HZKY20220204）
深部煤矿采动响应与灾害防控国家重点实验室自主课题(SKLMRDPC20ZZ05) （SKLMRDPC20ZZ05）
