骨料粒形粒径对骨架特性及透水混凝土性能影响研究  

Study on influence of aggregate morphology and size on skeleton characteristics and performance of pervious concrete

作　　者：单景松 代光伟[1,2] 王芳 彭伟 郭世腾[1,2] SHAN Jingsong;DAI Guangwei;WANG Fang;PENG Wei;GUO Shiteng(College of Civil Engineering and Architecture,Shandong University of Science and Technology,Qingdao 266590,China;Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation,Shandong University of Science and Technology,Qingdao 266590,China)

机构地区：[1]山东科技大学土木工程与建筑学院,山东青岛266590 [2]山东科技大学山东省土木工程防灾减灾重点实验室,山东青岛266590

出　　处：《山东科技大学学报(自然科学版)》2025年第1期90-99,共10页Journal of Shandong University of Science and Technology(Natural Science)

基　　金：山东省自然科学基金项目(ZR2021ME004);住房和城乡建设部科技项目(2020-K-063)。

摘　　要：骨料形态对透水混凝土骨料骨架、强度及渗透性等方面产生影响。基于骨料颗粒粒形分级,研究了骨料形状及粒径对透水混凝土渗透性能、抗压强度、破坏状态的影响,同时借助计算机断层扫描技术研究了骨料形状及粒径对透水混凝土内部空隙率、空隙尺寸等空间分布特性的影响。研究结果表明:以粒径为4.75~9.5 mm的棱角鲜明型骨料为基准,加入不同粒径的棱角鲜明型骨料形成的骨架嵌锁能力和抗压强度较单一粒径更好,空隙分布更均匀,破坏形态为单个骨料散落,颗粒破碎较少;加入2.36~4.75 mm针片状细骨料或9.5~13.2 mm圆滑型粗骨料均导致骨架贯入强度大大降低,降幅分别为60.1%和34.4%;加入2.36~4.75 mm细骨料使透水混凝土透水能力降低,而加入9.5~13.2 mm针片状粗骨料后等效孔径集中在1.5~3.0 mm,连通空隙比重增加,透水系数增加了10.2%,但抗压强度降低了10.4%,破坏时针片状骨料发生破碎;加入9.5~13.2 mm较圆滑型粗骨料后试件中部的空隙率较低,空隙空间分布不均匀,透水能力最差,破坏时骨料散落量较大。The aggregate morphology can affect the skeleton,strength and permeability of pervious concrete.Based on the grading of aggregate particles,this paper studies the influence of aggregate shape and size on the permeability,compressive strength and failure state of permeable concrete.With the help of computed temography(CT),it also studies the influence of aggregate shape and particle size on the spatial distribution characteristics of void ratio and void size in permeable concrete.The results show that based on sharp angular aggregate with the particle size of 4.75~9.5 mm,the interlocking ability and compressive strength of the aggregate skeleton formed by adding sharp angular aggregate of different particle sizes are better than that of the single particle size,the void distribution is more uniform,the destruction form is a single aggregate scattering,and the particle fragmentation is less.The addition of 2.36~4.75 mm needle sheet-like fine aggregate or 9.5~13.2 mm smooth coarse aggregate results in the reduction of skeleton penetration strength,with the decline reaching 60.1%and 34.4%.The addition of 2.36~4.75 mm fine aggregate reduces the water seepage capacity of permeable concrete,while the addition of 9.5~13.2 mm needle sheet-like coarse aggregate results in the concentration of equivalent aperture at 1.5~3.0 mm,the increase of the proportion of the connecting space,the increase of the water seepage coefficient by 10.2%,the reduction of the compressive strength by 10.4%,and the break of the needle sheet aggregate when it is destroyed.The addition of 9.5~13.2 mm smooth coarse aggregate results in low void rate in the middle of the specimen,the uneven void space distribution,the worst water permeability,and the larger scattering amount of aggregate when it is destroyed.

关 键 词：透水混凝土 骨料 骨架嵌锁能力 计算机断层扫描 空隙分布 

分 类 号：TU528[建筑科学—建筑技术科学]