摘要
为了研究憎水化处理对水工混凝土抗盐冻性能的影响,选择有机硅和硅烷两种憎水剂,制作水工混凝土试件并对其进行憎水化处理,进而测试其接触角和吸水率及随盐冻循环的质量损失率和相对动弹性模量。研究结果表明:憎水化处理能够显著提升水工混凝土的憎水性,大幅度降低其吸水率,平均改善幅度达70%,同时,能够在一定程度上改善水工混凝土的抗盐冻剥蚀质量损失率和相对动弹性模量损失,起到延缓和减轻水工混凝土盐冻破坏的作用。对应200次盐冻循环,憎水化处理混凝土的质量损失和相对动弹性模量损失分别平均降低了64.4%和51.2%。但是,值得注意的是憎水化处理在水工混凝土表层所形成的憎水层会随着盐冻循环逐渐破坏,导致憎水化处理对水工混凝土抗盐冻性能的改善作用逐渐丧失。
In order to study the salt⁃frost resistance of hydrophobic treatment on hydraulic concrete,specimens were fabricated and treated with two repellent agents of organosilicon and silane.Then,concrete contact angles and water absorption rates were measured.In addition,mass loss ratios and relative dynamic modulus of elasticity(RDME)of concrete during saline freeze⁃thaw cycle were tested periodically.The results show that the hydrophobic treatment can substantially improve the hydrophobicity of hydraulic concrete,greatly reduce its water ab⁃sorption with an average improvement ratio of 70%,and simultaneously improve the resistance of hydraulic concrete against salt scaling and RDME losses to a certain degree,which can delay and alleviate the salt⁃frost on hydraulic concrete.Corresponding 200 cycles of freezing and thawing in salt solution,the hydrophobic treatments averagely reduce the mass loss and RDME loss of concrete by 64.4%and 51.2%,re⁃spectively.However,it should be noted that the hydrophobic layer formed by repellent agents on the superficial concrete will be destroyed gradually with saline freezing⁃thawing cycle.As a result it will cause the improvement effects of hydrophobic treatment on hydraulic concrete salt⁃frost resistance gradually lost.
作者
张四化
郭东芹
李果
王俊伟
吕亚军
ZHANG Sihua;GUO Dongqin;LI Guo;WANG Junwei;LYU Yajun(Zhengzhou University Comprehensive Design Institute Co.,Ltd.,Zhengzhou 450002,China;China Second Metallurgical Group Co.,Ltd.,Baotao 014030,China;Jiangsu Architectural Vocational and Technical College,Xuzhou 221008,China;Henan D.R.Construction Group Co.,Ltd.,Zhengzhou 451464,China;College of Architecture,North China University of Water Resources and Hydropower,Zhengzhou 450046,China)
出处
《人民黄河》
CAS
北大核心
2021年第1期120-124,共5页
Yellow River
基金
国家自然科学基金面上项目(51779096)
河南省高校科技创新团队支持计划项目(20IRTSTHN010)。
关键词
憎水化
水工混凝土
盐冻
剥蚀
接触角
hydrophobic treatment
hydraulic concrete
salt frost
scaling
contact angle
