盐侵冻融循环下聚乙烯醇纤维混凝土孔结构分形特征

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国家科技期刊平台
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中文摘要：为研究聚乙烯醇(PVA)纤维对混凝土孔结构的影响及其与抗冻性能的联系,本文通过核磁共振技术对冻融循环作用下PVA纤维混凝土的微观孔结构进行了测试,分析了核磁共振T2谱和孔隙分布变化规律,并基于分形理论探究了其孔隙分形特征,揭示了冻融循环作用下PVA纤维混凝土孔结构与分形维数之间的关系.结果表明,PVA纤维混凝土在冻融循环前期表现出较好的抗冻性能;中孔(100 nm＜r≤1 000 nm)和大孔(r＞1 000 nm)的数量及占比增加,削弱了 PVA纤维混凝土的抗冻性能;PVA纤维混凝土具有一定的分形特征,分形维数Dmax在5次冻融循环前增大,而后随着冻融循环次数增加不断减小.

外文标题：Pore Structure Fractal Characteristics of PVA Fiber Concrete under Salt Erosion and Freeze-Thaw Cycle

外文摘要：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.

外文关键词：

freeze-thaw cyclePVA fiber concretepore structurenuclear magnetic resonancefractal dimensionfrost resistance

作者：

吴浩、薛维培、王中建

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作者单位：

安徽理工大学土木建筑学院,淮南 232001

安徽理工大学深部煤矿采动响应与灾害防控国家重点实验室,淮南 232001

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

基金：

国家自然科学基金青年科学基金安徽省自然科学基金面上项目教育部"春晖计划"合作科研项目深部煤矿采动响应与灾害防控国家重点实验室自主课题

项目编号：

523082282208085ME146HZKY20220204SKLMRDPC20ZZ05

出版年：

2024

硅酸盐通报

中国硅酸盐学会中材人工晶体研究院

硅酸盐通报

CSTPCD北大核心

影响因子：0.698

ISSN：1001-1625

年,卷(期)：2024.43(5)