透水模板成型混凝土分形维测试与分析

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发布时间：2021-10-22

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通过压汞试验，测试了普通模板与透水模板工艺成型混凝土的孔结构，用体积分形维数揭示
了试样距表面不同深度处各自孔结构的特征．结果表明：试验获取的材料孔隙率 P 和相应孔径 r
的函数关系—一 lg(1一P)～lg(r／R)曲线均有拐点，显示试样存在大孔和微孔 2个无标度区域，可
获取不同的体积分形维数；透水模板试样微孔段体积分形维数提高显著、阈值孔径减小且孔结构改
善效果由表层到内层逐渐减弱．
关键词：透水模板；压汞试验；分形维数；拐点；无标度区域
中图分类号：TU528．01 文献标志码：A doi：i0．3969／i．issn．1007—9629．2010．03．028
Fractal Dim ension Test and Analysis of Concrete Formed with Controlled
Perm eability Form work
丁jAN Zheng—hong ～， WANG Xiao ， WANG Yan—fei。， JIANG Zhao—yan
(1．State Key Lacoratary of Hydrology—Water Resources and Hydraulic Engineering，Hohai University，Nanjing
210098，China；2．College of Water Conservancy and Hydropower Engineering，Hohai University，Nanjing 210098，
China；3．Hangzhou YinBo Traffic Engineering M aterials Co．，Ltd，Hangzhou 31l112，China；4． Hedong District
W ater，Linyi 276034，China)
Abstract：The performance of concrete specimens formed with controlled permeability form work (CPF)
com pared with ordinary plywood form work were studied by means of fractal theory．M ercury intrusion po—
rosimeter test were carried out on samples and volume fractal dim ensions were calculated． It shows that
different volume fractal dimensions of samples are differentiated from the macro—pore zones and micro—pore
zones as a result of inflexion points calculated from curve of lg(1一P)一lg(r／R)．In addition，the inflexion
points divide the curve into two scale—·free region and the volume fractal dimensions of micro——pore zones in——
crease significantly，threshold pore sizes reduce obviously by using CPF．The porous structure is more im—
proved on the surface than the inner part．
Key words：controlled permeability formwork (CPF)；mercury porosimetry；fractal dim ension；inflexion
point；scale—free region
透水模板 (controlled permeability formwork，
CPF)是在传统模板浇注混凝土施工工艺上产生的
一种改善混凝土性能的新型工艺．将透水模板布
黏附或铺贴在普通模板内侧，能够有效降低成型混
凝土表面的水胶比，改善混凝土表观质量，增加混凝
土浅表层密实性，提高混凝土强度和耐久性．国
内外已有 CPF改善混凝土性能的一些宏观、微观性
能试验研究，如 DuPont公司以及 Fibertex A／S公