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渗漏及由此而引起的大坝混凝土的溶出性侵蚀,是我国水工混凝土建筑物中常见的病害。本文通过对不同配比的水泥净浆试样进行溶蚀试验,研究和分析了水泥品种、水灰比、粉煤灰、硅粉及外加剂等因素对水泥石抗溶蚀性能的影响。并运用高压水银测孔仪、差热分析仪及扫描电镜等设备,通过比较分析溶蚀前后水泥石亚微观结构的测试结果,研究了水泥石中CaO溶出量对水泥石孔结构、微观结构和化学组成的影响,并从亚微观和微观方面对掺用粉煤灰、硅粉提高水泥石抗溶蚀性能的机理进行了探讨,对今后的大坝工程加固、选取优质防渗灌浆材料及提高工程耐久性提供了科学依据。
Leakage and the consequent erosion of dam concrete is a common disease in China’s hydraulic concrete structures. In this paper, different proportions of cement paste samples were tested for corrosion resistance. The effects of cement type, water-cement ratio, fly ash, silica fume and additives on the corrosion resistance of cement were studied and analyzed. By means of high pressure mercury porosimeter, differential thermal analyzer and scanning electron microscope, the microstructure and chemical properties of cement stone were studied by comparatively analyzing the test results of submicroscopic structure of cement stone before and after dissolution. The mechanism of improving the corrosion resistance of cement stone with fly ash and silica fume from submicroscopic and microscopic aspects was discussed. For the future dam reinforcement, the selection of high-quality seepage-proof grouting material and the improvement of durability Sex provides a scientific basis.