透水混凝土抗硫酸盐侵蚀性能研究  

Study on Sulfate Erosion Resistance of Permeable Concrete

作　　者：刘莲馥[1] 尹斌[1] LIU Lianfu;YIN Bin

机构地区：[1]山东交通职业学院,山东潍坊261206

出　　处：《城市道桥与防洪》2020年第8期262-267,M0025,共7页Urban Roads Bridges & Flood Control

基　　金：山东省交通运输科技计划(2019B19);潍坊市科学技术发展计划项目(2018GX076)。

摘　　要：海绵城市建设热潮下,透水混凝土将扮演重要的角色。通过对透水混凝土砂率、水胶比、设计孔隙率以及增强剂掺量等四种因素四种水平进行正交试验,得到最优配比,并在最优配比基础下进行抗硫酸盐侵蚀性能的试验,结果发现:当砂率为6%、水胶比为0.3、设计孔隙率为14%、增强剂掺量为9%时,抗折强度与抗压强度存在共同的最优配合,当砂率为0%、水胶比为0.28、设计孔隙率为20%、增强剂掺量为5%时,透水系数最大,透水性能最好;通过功效系数法,对抗压、抗折强度和透水系数三者进行综合分析,确定出最优配合比:砂率为4%、水胶比为0.31、设计孔隙率为18%、增强剂掺量为7%;透水混凝土试件在硫酸盐溶液中进行干湿循环侵蚀,随着循环次数的增加,试件表面将出现石子脱落及裂缝变大的现象;其强度由于生成的钙矾石和石膏的影响将先增大,后减小。Under the construction boom of sponge cities,the permeable concrete will play an important role.Through the orthogonal tests of four factors and four levels of sand rate,water-binder ratio,design porosity and fortifier dosage of permeable concrete,the optimal proportion is obtained,and the sulfate erosion resistance is tested on the basis of the optimal proportion.The result shows that when the sand rate is 6%,the water-binder ratio is 0.3,the design porosity is 14%,and the fortifier dosage is 9%,there is a common optimal proportion between flexural strength and compressive strength.When the sand rate is 0%,the water-binder ratio is 0.28,the design porosity is 20%and the fortifier dosage is 5%,the permeation coefficient is the maximum and the permeability performance is the best.The compression resistance,breaking strength and permeation coefficient are comprehensively analyzed by the efficiency coefficient method to determine the optimal mix proportion of 4%sand rate,0.31 water-binder ratio,18%design porosity and 7%fortifier dosage.The pervious concrete specimen is subjected to the dry and wet cycle erosion in the sulfate solution.With the increase of the number of cycles,the phenomenon of stone falling and cracks on the surface of the specimen will appear.Its strength will increase first and then decrease due to the influence of the generated ettringite and gypsum.

关 键 词：海绵城市 透水混凝土 力学性能 透水性能 侵蚀性能 

分 类 号：U414[交通运输工程—道路与铁道工程]