现场运行近50年水工混凝土性能的试验研究

Experimental research on characteristics of approximate fifty years hydraulic concrete

试验研究了龄期近50年混凝土的材料性能。混凝土的抗压强度增长趋势符合对数曲线的关系;劈拉强度与抗压强度存在良好的内在关系,且泊松比的数值与普通混凝土的基本一致;过水水工混凝土的碳化层强度要低于未碳化混凝土的强度,这与碳化混凝土的孔径、总孔隙率及最可几孔径变大,孔结构状况变差有关;长龄期未碳化混凝土的抗渗能力与混凝土的设计强度比较匹配,并没有随着强度的增长而提高,孔结构压汞测试及电镜观察结果揭示了其中的原因。

Material characteristics of approximate fifty years concrete have been tested in this research.The results indicate that increasing of compressive strength of long age concrete accords with logarithm curve, splitting tensile strength and compressive strength have good internal relationship ,and Poisson＇s ratio value corresponds with common concrete.It is also discovered that carbonated zone strength is lower than uncarbonated zone strength for the water-carrying hydraulic concrete,which results from the enlargement of pore diameter,total pore volume and most probable pore size of carbonated zone of the concrete ,and the deterioration of pore structure.The impermeability of the long-age uncarbonated concrete almost accords with design strength of the concrete, and does not elevate with the increasing of concrete strength,which is revealed by mercury intrusion pores method （MIP） and scanning electron microscope （SEM）.