西藏高寒地区混凝土的耐久性问题及对策

Durability problem of concrete in alpine region of Tibet and its countermeasures

在西藏特殊环境条件下混凝土工程往往在耐久性方面比内地弱[1],这是一个难度较大,值得研究和探讨的课题。西藏混凝土的耐久性问题主要表现在:抗冻融循环性能、抗渗性能、耐腐蚀性能、抗Cl-渗透性能、抗碱———骨料反应性能、抗风蚀性能、护筋性能、抗裂性能等无法适应当地环境,导致一些工程的结构在工程完工不久之后遭到损伤或破坏。为此,本文提出解决这些问题的主要措施应为:加强高原新型混凝土原材料的研究和应用,优化混凝土配合比和研究新型混凝土,创新混凝土施工过程管控技术。

Under the particular environment of Tibet, the durability of the concrete works is usually poorer than that of the concrete works in the interior of China , which is a valuable subject with larger difficulty to be studied and researched. The durability problem of concrete in Tibet mainly exhibits that its performances such as frost thawing resistance, anti-seepage characteristics, anti-corrosion, chloride-permeation resistance, alkali-aggregate reaction, wind erosion-resistance, reinforcement protection, anti- cracking, etc. cannot adapt to the local environment, and then the structures of some concrete works are usually damaged or failed soon after the completions of them. Therefore, it is put forward herein that the main measures to solve these problems are to be strengthening the research and application of the relevant raw materials of concrete for alpine region, optimizing the concrete mixing ratio and researching new type of concrete and innovating management and control technologies for concrete construction process.