Construction characteristics and stability of polyurethane mixture under environmental factors
Taking the splitting tensile strength as the key index,the influence of technology,material composition and other factors on the construction characteristics of polyurethane mixture were analyzed in this paper.By monitoring the performance of polyurethane mixture in high temperature water area and long-term freeze-thaw condition,the stability of polyurethane mixture under environmental factors was analyzed.The results showed that adding chain extender can accelerate the formation of early strength and increase the volume expansion height of polyurethane mixture.It was recommended that 6%chain extender should be used in external admixture construction and 3%chain extender should be used in internal admixture construction.The damage of splitting tensile strength of polyurethane mixture at high temperature is small,and the splitting tensile strength of polyurethane mixture decreases obviously under long-term freeze-thaw cycles,however,the splitting tensile strength after freezing and thawing for five times is still more than three times of asphalt mixture.The polyurethane mixture can meet the demand of pavement.
NETL
NSTL
万方数据
