Study on Pavement Performance of High-toughness Fiber Cement Stabilized Gravel
Reflective crack is a common problem in semi-rigid base of asphalt pavement.It is proposed to incorporate the self-developed special high-toughness fiber into the cement stabilized gravel to improve its crack resistance.By measuring the unconfined compressive strength,splitting strength,uniaxial compressive modulus and shrinkage coefficient of cement stabilized gravel with various fiber contents,the variation influence law of this fiber on the performance of cement stabilized gravel is analyzed.The test results show that with the increase of fiber content,the unconfined compressive strength and splitting strength of cement stabilized gravel at 7 d,28 d and 90 d increase first and then decrease,and the strength of each index is the largest when the fiber content is 1 ‰,and the uniaxial compression modulus has a maximum value at 2 ‰.The unconfined compressive strength and splitting strength of 90 d are increased by 14.1％and 9％respectively after adding 1 ‰ fiber.The shrinkage performance of cement stabilized gravel can be improved by adding the special high-toughness fiber.When the fiber content is 1 ‰,the temperature shrinkage coefficient and the dry shrinkage coefficient are increased by 14.1％and 12.8％respectively compared with those without fiber.
cement stabilized gravelhigh-toughness special fibershrinkage performancemechanical properties
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