低强度等级水工混凝土耐久性提高措施  

Measures of Improving Durability of Low-strength Hydraulic Concrete

作　　者：韩仕宾 江敏[2] 刘培科[3] 刘红霞[3] 

机构地区：[1]南水北调东线江苏水源有限责任公司,南京210029 [2]江苏省骆运水利工程管理处,江苏宿迁223800 [3]河海大学水利水电学院,南京210098

出　　处：《南水北调与水利科技》2013年第2期147-150,共4页South-to-North Water Transfers and Water Science & Technology

基　　金：江苏省自然科学基金(BK2010517);南水北调工程科技创新项目(NSBD-SNEZ(F)/KY-01-20-2012);江苏省水利科技重点项目"混凝土表层致密化技术研究与推广应用"(2009021)

摘　　要：由于水工混凝土自身胶凝物质含量少,强度等级较低,因此混凝土成型后表观质量普遍较差,成为影响其致密性和渗透性的关键因素。为了有效地提高混凝土的耐久性,根据南水北调东线睢宁二站泵站混凝土工程高质量成型需求,探讨了普通模板和透水模板浇筑养护条件下低强度等级水工混凝土成型性能差异。泵站底板混凝土现场工艺试验及相关耐久性试验结果显示,对于不同配比的混凝土试样,采用透水模板布后,成型致密光滑,表面无缺陷或孔洞气泡,密实度得到不同程度的改善,回弹强度显著增长,冻融、碳化及冲磨等耐久性指标也有所提高。Hydraulic concrete contains low cementitious materials and has low strength grade. The surface quality of hydraulic concrete after forming is a key factor that affects the density and low-perraeability of hydraulic concrete,and it is also an impor- tant factor to improve the durability of hydraulic concrete. Based on the high quality requirements of hydraulic concrete in the Suining 2nd Pumping Station of the Eastern Route of the South-to-North Water Diversion Project, the different qualities of low- strength hydraulic concrete with the moulds pasted controlled permeability framework liner （CPFL） and common moulds were investigated. The results based on the in-situ engineering tests and durability tests of hydraulic concrete at the bottom plane of pumping station showed that the surface of concrete with different proportions using CPFL is dense and smooth without any de- fects such as holes and bubbles, and the compactness has been improved and rebound strength has been increased greatly. More- over, the durability indexes such as freeze-thaw, carbonation, and abrasion have also been improved. Consequently, using CPFL is an effective measure to strengthen the durability of low-strength concrete.

关 键 词：低等级水工混凝土 透水模板布 表观质量 耐久性 

分 类 号：TV431[水利工程—水工结构工程] TU755.2[建筑科学—建筑技术科学]