关键词: 道路工程;重复加载;养生龄期;压浆材料;使用寿命

Abstract: To study the service life of grouting material at repairing place of empty beneath pavement slab , organic and inorganic grouting materials were selected with the stress ratio be 0.7, 0.8 and 0.9 and the curing age be 1 d, 3 d, 7 d, 14 d and 28 d.It studied the change law of service life of different grouting materials at different ages in different environment .The test result indicates that after salt damage , the maximum decreasing amplitude of splitting strength of inorganic material is 40％ and the decreasing amplitude of splitting strength of organic material can be controlled within 30％.It indicates that the decreasing amplitude of splitting strength of organic material is more stable than that of inorganic material in salt damage area .No matter in normal environment or salt damage environment , the service life of inorganic material is generally higher than that of organic material , of which, the service life of grouting material is closely related to age .With the increasing of age , the service life of these two materials increases constantly .When stress ratio increases , the service life of organic material in these two kinds of environment is stable .

Key words: road engineering;repeated loading;curing age;grouting material;service life