白溪水库二期面板工作条件比较严酷 ,为了提高面板的质量和耐久性 ,进行了二期面板聚丙烯纤维混凝土的试验研究。研究表明 ,混凝土加入 0 9kg/m3的聚丙烯纤维后 ,可以明显改善混凝土的变形性能 ,表现为减少混凝土干缩和抑制裂缝发生 ,增加极限拉伸率 ,降低弹性模量 ,大大提高了弯曲韧性 ,混凝土的耐久性显著提高 ,抗冻标号从F1 0 0提高到F2 0 0。加速老化试验证明 ,紫外线照射对混凝土内部的纤维影响仅发生在浅表层 3～ 4mm内 ,对混凝土整体性能没有影响。聚丙烯纤维混凝土施工工艺与普通混凝土基本相同。采用适当的拌和方法、控制适宜的坍落度、加强振捣和收面工序 ,可以保证面板的施工质量。混凝土造价仅增加约 5 0元 /m3。与取得的效益相比 ,是十分经济的 The working conditions of the second phase of Baixi Reservoir are rather harsh. In order to improve the quality and durability of the panel, the second phase of the test of polypropylene fiber concrete is carried out. The results show that the addition of 0 9 kg / m3 polypropylene fiber can obviously improve the deformation performance of concrete, which is manifested in reducing concrete shrinkage and cracking, increasing the ultimate tensile ratio, decreasing the elastic modulus, and greatly improving the flexural toughness , The durability of concrete significantly increased, antifreeze label increased from F1 0 0 to F2 0 0. Accelerated aging tests show that the influence of ultraviolet radiation on the fibers inside the concrete occurs only in the shallow 3 ~ 4mm, has no effect on the overall performance of concrete. Polypropylene fiber concrete construction process is basically the same with ordinary concrete. Adopt the appropriate mixing method, control the appropriate slump, strengthen the vibrating and closing process, which can ensure the construction quality of the panel. Concrete cost increased only about 50 yuan / m3. Compared with the benefits obtained, it is very economical