关键词: 道路工程, 多孔玄武岩, 玄武岩纤维, 水泥稳定碎石, 力学性能, 基层

Abstract: Through splitting strength tests, unconfined compressive strength tests and flexural-tensile strength tests, the enhancement effect of basalt chopped fiber on mechanical properties of cement stabilized porous basalt macadam was studied. The splitting test of mixture with age of 7 d shows that the basalt chopped fiber significantly improves the splitting strength of cement stabilized porous basalt macadam, and the enhancement effect of fiber with the length of 18 mm is better than the fiber with the length of 12 mm and 24 mm on splitting strength of mixture. As for cement stabilized porous basalt macadam with 18 mm basalt fiber, the splitting strength, unconfined compressive strength and flexural-tensile strength increase first and then decrease with the increase of the fiber content. When the fiber content is 0.10% (mass fraction), the fiber has the best enhancement effect on the mechanical properties of mixture. Adding the basalt chopped fiber increases the 7 d unconfined compressive strength, splitting strength and flexural-tensile strength of mixture by 0.7% to 5.4%, 11.4% to 34.3% and 6.9% to 20.4%, respectively. With the increase of curing age, the mechanical properties of mixture are continuously improved. The 90 d unconfined compressive strength, splitting strength and flexural-tensile strength of mixture are 8.32 MPa, 1.03 MPa and 3.72 MPa, respectively. The results show that the road performance ofcement stabilized porous basalt macadam is improved by adding basalt chopped fiber.

Key words: road engineering, porous basalt, basalt fiber, cement stabilized macadam, mechanical property, road base