凌国栋,丁平,周斌,张丰,陈波,吕乐乐,胡海明

• 1:扬州市水利局
• 2:扬州市水利工程建设中心
• 3:扬州市瓜洲泵站工程建设处
• 4:水文水资源与水利工程科学国家重点实验室南京水利科学研究院

摘要(Abstract)：

无砂混凝土是一种重要的绿色生态护坡建筑材料，具有良好的透水性和透气性，但强度普遍偏低。无砂混凝土透水系数与抗压强度为负相关关系，同时满足高强度、高透水性有难度。基于某泵站工程现场用原材料，深入研究目标孔隙率P、水灰比W/C、骨料粒径、水泥种类等因素对无砂混凝土性能的影响，在此基础上提出高强度、高透水系数无砂混凝土的制备方案。结果表明：插捣成型条件下，实测连续孔隙率C_(void)均大于设计的目标孔隙率P。P一定时，存在最优W/C,使无砂混凝土透水系数最大；28 d抗压强度则随W/C(0.21～0.33范围内)的增大而提高。推荐采用工地现场所用5～16 mm连续级配骨料、P·O 52.5水泥制备无砂混凝土，P宜取15%,W/C宜取0.27或0.30;制备的无砂混凝土综合性能良好，可同时满足透水系数k_T≥1 mm/s、28 d抗压强度f_(cc)≥25 MPa的要求。

关键词(KeyWords)： 无砂混凝土;配合比设计;孔隙率;透水系数;抗压强度

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划(2018YFC0406702);; 国家自然科学基金项目(51739008);; 中央级公益性科研院所基本科研业务费专项(Y419004)

作者(Author): 凌国栋,丁平,周斌,张丰,陈波,吕乐乐,胡海明

DOI: 10.13928/j.cnki.wrahe.2022.04.018

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