海洋环境混凝土结构高性能水泥基包裹材料与防护技术研究

项目名称： 海洋环境混凝土结构高性能水泥基包裹材料与防护技术研究

项目编号： No.50878109

项目类型： 面上项目

立项/批准年度： 2009

项目学科： 生物科学

项目作者： 田砾

作者单位： 青岛理工大学

项目金额： 36万元

中文摘要： 海洋环境下重大工程设计使用寿命长，而混凝土性脆易裂，腐蚀条件下耐久性难以保证。使用期内的合理维护与修复对于大型海洋工程的寿命与安全意义重大。本项目首次利用高模量聚乙烯醇纤维与硅烷防水剂复合增强，并利用粉煤灰等超细掺料优化配制具有高韧性和高抗渗性的海洋混凝土结构包裹防护材料。通过实验室和海洋暴露试验，借助微观及中子放射成像技术等手段，研究了包裹防护材料的力学性能、碳化、抗Cl-渗透、孔结构、裂隙分布与水分迁移规律等。结果表明：经过合理的骨料级配，砂子最大粒径可由110μ增至1.18mm，粉煤灰掺量占胶凝材料总量的50%-60%，根据裂缝宽度与直拉应变的函数关系、基于抗渗性能的防水剂适宜掺量等要求，可以制备高性能水泥基防护材料，并满足海洋环境下修复结构的抗腐蚀寿命要求。通过叠合构件、Z型试件等研究了修复结构界面的抗弯、抗剪性能，修复构件及结构体系在荷载及不同海洋环境作用耦合下的性能演变规律，探求了界面强化机理。发明专利-便携式直拉应力腐蚀仪和逆向分析软件有助于该材料及防护技术的实际应用。除海洋环境外，该材料及修复技术可用于其他侵蚀环境下的结构防护或快速修复，有利于节能减排与可持续发展。

中文关键词： 聚乙烯醇(PVA)纤维；水泥基复合材料；海洋环境；硅烷防水处理；多因素耦合

英文摘要： Concrete is prone to crack, therefore the durability and service life of the important concrete structures under marine environment are hard to ensure. High modulus polyvinyl alcohol (PVA) fiber, silane waterproof agent, fly ash and other superfine admixtures were used to optimize strain hardening cement-based composites(SHCC) with high ductility and anti-permeability that can be adopted in maintenance and repair of the Concrete structures under marine environment. Researches on mechanical properties, carbonation, pore structure, moisture migration rule of SHCC have be done through laboratory and marine exposure test, with the aid of microcosmic and neutron radiation imaging technology and other means. Results show that, after reasonable aggregate gradation, maximum diameter of sand is less than 1.18 mm, the fly ash content is 50%-60% relate to the total amount of binder, the high performance cement-based protective materials which meet the marine environment requirement can be manufactured according to the anti-permeability requirement and the function relation between crack width and tensile strain. By means of the study on the bending, shear, cohesion and anti-permeability property of SHCC-Concrete composite components, Z-type specimens, the interface strengthen mechanism was proclaimd, that is, the bridging connection effect of PVA fiber and the inside waterproof results in high tensile strain, high energy consuming ability and corrosion resistance with repellency fine pores. Performance deterioration pattern of the repair member under carbonation, chlorid ion capillary suction and tensile or compressive load coupling were also discussed by means of experiments and numerical simulation. Invention patent"portable tensile stress corrosion instrument"and inverse analysis software CONHARD(CONSOFT) conduce to practical application of the material and the protection technology. In addition to the Marine environment, the results can also be used in protection or fast repair of the concrete structures under the other erosion environment even in the joint of the anti-seismic structures. It's helpful for energy conservation, emission reduction and sustainable development.

英文关键词： Polyvinyl alcohol（PVA）fiber; cement-based composites;marine environment;silane water repellent;Multifactor coupling