高盐度海域混凝土耐久性研究

Study on Durability of Concrete in High-salinity Sea Areas

通过试验研究了纤维复合材料网格、大掺量活性掺和料、高性能混凝土流变改性材料对混凝土劈裂强度、工作性、流变性及抗裂性能的影响。试验结果表明,粉煤灰能够提高氯离子扩散率,进而提高混凝土的耐久性;流变改性材料不仅可以有效地降低新拌混凝土的塑性粘度,提高混凝土的泵送性能,也可以提高混凝土的抗压强度和劈裂强度;纤维复合材料网格对混凝土的抗裂性能提高有限。上述结果可对高盐度海域混凝土配合比提供建议。

The influences of fiber composite mesh,high-volume reactive admixtures,and high-performance concrete rheology modifiers on concrete splitting strength,workability,rheology and crack resistance were experimentally studied.The test results showed that fly ash can improve the diffusion rate of chloride ions,thereby improving the durability of concrete,the rheology modifier can not only effectively reduce the plastic viscosity of fresh concrete and improve its pumping performance,but also increase its compressive strength and splitting strength.The fiber composite mesh had limited improvement in the crack resistance of concrete.The above results can provide suggestions for concrete mix design in high-salinity seas.