海水暴露环境下带裂缝混凝土的表面防水处理  

Water Repellent Treatment on Surface of Cracked Concrete under Seawater Exposure Environment

作　　者：张鹏[1] 戴建国[2] 赵铁军[1] Folker H.Wittmann S.Hartmann 

机构地区：[1]青岛理工大学土木工程学院,山东青岛266033 [2]香港理工大学土木及结构工程学系,中国香港 [3]瑞士Paul Scherrer Institute,瑞士

出　　处：《建筑材料学报》2009年第2期214-218,共5页Journal of Building Materials

基　　金：国家自然科学基金重点项目(50739001);山东省自然科学基金重点项目(Z2006F02)

摘　　要：对带裂缝混凝土表面进行了4种不同硅烷防水处理,通过770次海水干湿循环暴露试验,研究了表面防水处理对带裂缝混凝土水分和Cl-渗透的影响.结果表明,对于无裂缝混凝土而言,硅烷防水处理有效抑制了水分和Cl-的渗透;混凝土开裂后及时进行特定的硅烷防水处理,那么即使裂缝宽度达0.2 mm,仍可建立有效的Cl-隔离层;防水处理后混凝土再开裂时,则防水效果对裂缝宽度的敏感性较大.因此,对带裂缝的钢筋混凝土结构进行硅烷防水处理前,必须对其裂缝状态进行正确评估,以保证硅烷防水处理的有效性.Based on 770 seawater wet/dry cyclic exposure test,water repellent treatment（WRT） with use of four different types of silane was applied on the surface of cracked concrete to study the influence of WRT on water and Cl^-penetration.Results show that for the concrete not cracked,WRT restrains penetration of water and Cl^-into concrete effectively.If WRT is properly applied on cracked concrete surface even with the crack width of 0.2 mm,special silane treatment can still establish an effective Cl^-barrier.While for concrete surface treated previously,when crack occurs again,the efficiency of WRT is highly sensitive to the magnitude of crack width.Therefore,it is necessary to evaluate carefully the state of cracks in concrete before applying silane-based surface water repellent treatment on reinforced concrete structures in order to ensure the efficiency of the treatment.

关 键 词：海水干湿循环 裂缝 表面防水处理 吸水量 Cl-渗透 憎水层 

分 类 号：TU528.0[建筑科学—建筑技术科学]