高原环境引气混凝土研究现状及抗冻耐久性提升措施分析  

Research Status of Air-entrained Concrete in Plateau Environment and Analysis of Measures to Improve Freeze-Thaw Durability

作　　者：蔡伟泰 欧阳幼玲[1] 钱文勋 江朝华[2] Cai Weitai;Ouyang Youling;Qian Wenxun;Jiang Chaohua(Nanjing Hydraulic Research Institute,Nanjing 210029,China;Hohai University,Nanjing 210098,China)

机构地区：[1]南京水利科学研究院,南京210029 [2]河海大学,南京210098

出　　处：《青海科技》2024年第4期110-116,共7页Qinghai Science and Technology

基　　金：中央级公益性科研院所基本科研业务费重点专项“西藏地区水工混凝土冻融损伤特性及抗冻耐久性提升技术研究”(Y422001)。

摘　　要：青藏高原平均海拔4 000多米,海拔高、气压低、正负温交替天数多,冻融破坏是导致高原地区混凝土结构物性能劣化的最主要因素之一。文章对高原环境下引气混凝土的研究现状进行了分析,论述了低气压对引气剂溶液引气性能、混凝土含气量、孔结构与气孔结构的影响规律,提出了高原环境下提高混凝土抗冻耐久性的相关措施。The Qinghai-Tibet Plateau,with an average altitude exceeding 4,000 meters,is characterized by its high elevation,low atmospheric pressure,and frequent freeze-thaw cycles.Freeze-thaw damage is one of the primary factors leading to the deterioration of concrete structures in this high-altitude region.This paper reviews the current research on air-entrained concrete in plateau environments,examining the impact of low atmospheric pressure on the performance of air-entraining agents,air content,pore structure,air-void structure in concrete.It also proposes measures to enhance the freeze-thaw durability of concrete under plateau conditions.

关 键 词：高原环境 引气混凝土 引气剂性能 含气量 气孔结构 孔结构 抗冻耐久性 

分 类 号：TU528[建筑科学—建筑技术科学]