老化玄武岩纤维沥青混合料冻融劈裂试验研究

Experimental Study on the Freeze-thaw Splitting Performance of Aged Asphalt Mixture Reinforced by Basalt Fiber

为了研究不同条件下玄武岩纤维沥青混合料的冻融劈裂性能,通过向沥青混合料中掺加玄武岩纤维制备试验试件,并测试分析不同条件处理试件的冻融劈裂性能。结果表明:玄武岩纤维可改善沥青混合料的冻融劈裂性能,同时还可增强紫外老化和冻融循环、热氧老化和冻融循环下沥青混合料的韧性。玄武岩纤维掺量为0.6%时,4次冻融和未老化下,沥青混合料的劈裂强度较未冻融未老化及未掺玄武岩纤维下分别减小0.52%、14.47%、21.45%、31.78%;4次冻融和紫外老化下,0.6%玄武岩纤维掺量沥青混合料的劈裂强度较未冻融老化及未掺玄武岩纤维下分别减小5.94%、19.64%、27.65%、39.28%;紫外老化和未冻融下,0.6%玄武岩纤维掺量沥青混合料的劈裂强度较未老化未冻融及未掺玄武岩纤维时增大3.88%。热氧老化未冻融下,0.6%玄武岩纤维掺量沥青混合料的劈裂强度较未老化未冻融及未掺玄武岩纤维时增大1.29%。紫外老化、热氧老化及未冻融下,0.6%玄武岩纤维掺量沥青混合料的劲度模量较未老化未冻融时分别增大1.01%和10.23%。

In order to study the freeze-thaw splitting performance of basalt fiber asphalt mixture under different conditions,the specimens with basalt fiber were prepared and the freeze-thaw splitting performance of specimens under different conditions were tested and analyzed.Results show that basalt fiber can improve the freeze-thaw splitting performance of asphalt mixture,and can also enhance the toughness of asphalt mixture under ultraviolet aging and freeze-thaw cycles,thermo-oxidative aging and freeze-thaw cycles.When the dosage of basalt fiber is 0.60%,the splitting strength of asphalt mixture decreases by 0.52%,14.47%,21.45%,31.78%respectively under four freeze-thaw cycles compared that without aging condition,freeze-thaw and basalt fiber.Under four freeze-thaw cycles and ultraviolet aging conditions,the splitting strength of asphalt mixture decreases by 5.94%,19.64%,27.65%,39.28%compared that without aging condition,freeze-thaw and basalt fiber,respectively.Under UV aging and non-freezing-thawing conditions,the splitting strength of asphalt mixture with 0.60%basalt fiber content increases by 3.88%compared with that without aging condition,freeze-thaw and basalt fiber.Under thermo-oxidative aging and without freeze-thaw,the splitting strength of asphalt mixture with 0.6%basalt fiber increases by 1.29%compared with that without aging condition,freeze-thaw and basalt fiber,respectively.Under UV aging,thermo-oxidative and without freeze-thaw,the stiffness modulus of asphalt mixture with 0.6%basalt fiber increases by 1.01%and 10.23%compared with that without aging condition and without freeze-thaw.