重复加载对不同龄期压浆材料使用寿命影响研究

为研究板底脱空修补处压浆材料的使用寿命,分别选取有机类和无机类压浆材料,应力比控制为0.7、0.8、0.9,养生龄期为1d、3d、7d、14d、28d.研究了不同龄期不同环境下不同压浆材料使用寿命的变化规律.试验结果表明:经过盐损害后,无机材料劈裂强度降幅最大为40％,而有机材料劈裂强度降幅可控制在30％以内,这表明在盐损地区有机材料的劈裂强度降幅较无机材料更为稳定.无论在正常环境还是盐损环境下,无机材料的寿命总体上均高于有机材料,其中压浆材料的使用寿命与龄期的关系十分紧密,随着龄期的增长,两种材料的寿命均不断的增加.当应力比增大时,两种环境下的有机材料使用寿命均较为稳定.

Impact of Repeated Loading on Service Life of Grouting Material at Different Ages

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 .