Influence of ion erosion on RHPB strength in brine environment

Abstract

In order to study the change of dynamic elastic modulus, compressive strength and flexural strength of recycled coarse aggregate high performance concrete (RHPB) specimens during one-year corrosion period in Salt Lake brine, and to explore the failure mechanism of its physical and mechanical behavior, the dynamic elastic modulus and strength of concrete specimens and beam members under the corrosion age of RHPB were studied. Research on the influence of degree and so on. The experimental results show that the longer the corrosion time of RHPB specimens is, the higher the chloride ion content is, the stronger the corrosion strength will become; the coexistence of ions can also affect the corrosion rate; the loss of dynamic elastic modulus will increase with the extension of the corrosion time under 0a-1.0a erosion; and under the same replacement rate of recycled coarse aggregate (RG), R. When the corrosion time of HPB is 0-1.0a, the flexural strength increases continuously with the extension of service time. The compressive strength of specimens with different RG replacement rates decreases as a whole under corrosion. At 1.0a, the compressive strength decreases most obviously with the increase of RG replacement rate, and the strength decreases the most, RG substitution rate of 40% is the best.