堆石混凝土抗冻抗渗性能的试验研究

Experimental Research on Freeze-thaw Resistence Property and Impermeability for Rock-filled Concrete

堆石混凝土抗冻、抗渗性能的好坏直接影响结构的安全性和可靠性.对堆石混凝土切割试样的抗冻性能和抗渗透性能的试验研究表明:堆石混凝土的渗水主要发生在施工冷缝处的粘结面上,该粘结面是渗水的主要通道,其渗透性大于施工热缝处的渗透性;冻融循环作用下,冷缝粘结面的劈裂抗拉强度和抗压强度均低于热缝粘结面处的相应强度,且强度损失率也较热缝处大.

The freeze -thaw resistance property and impermeability of RFC affect directly the safety and reliability of its structure. The author had conducted experimental research to the samples after testing the mechanical properties of the RFC exposed to freeze - and - thaw cycles and the impermeability under water pressure. The test results indicated that the bonding interface of the construction ＂cold＂ joints was the main path of seepage, and the permeability of the ＂cold＂ joints was greater than that of the＂hot＇joints;the splitting tensile strength and the compressive strength of the ＂cold＂joints were less than the splitting tensile strength of the ＂hot＂ joints, and the loss rate of strength was greater.