水泥稳定碎石早期损伤自愈合疲劳特性试验研究

发布时间：2018-04-04 05:12

本文选题：道路工程　切入点：水泥稳定碎石　出处：《硅酸盐通报》2017年08期

【摘要】：为了使水泥稳定碎石基层微裂技术在实际工程应用中的理论依据得到进一步完善,对水泥稳定碎石早期损伤自愈合疲劳性能进行全面和深入的研究。使用振动压实仪成型水泥稳定碎石梁式试件,并在不同微裂时间对梁式试件进行不同程度的微裂;在龄期为90 d时,通过弯拉强度试验和疲劳试验测定微裂前后水泥稳定碎石材料的弯拉强度和疲劳寿命次数,并对试验结果进行分析。研究微裂后水泥稳定碎石材料早期损伤自愈合疲劳寿命的变化规律,并且应用Weibull分布建立了水泥稳定碎石微裂疲劳方程。研究结果表明:微裂前后的水泥稳定碎石材料疲劳寿命随应力水平增加均呈现出线性递减的规律;微裂程度为20%和30%时,水泥稳定碎石材料的疲劳寿命与未微裂时水平基本一致,微裂程度为40%的水泥稳定碎石材料的疲劳寿命相对降低,但仍在使用要求范围内;微裂时间对疲劳试验结果无显著性影响。
[Abstract]:In order to further improve the theoretical basis for the application of micro-crack technology of cement stabilized macadam base in practical engineering, the fatigue properties of early damage self-healing of cement stabilized macadam are studied comprehensively and deeply.Using vibratory compaction apparatus to form cement stabilized gravel beam specimen and to crack the beam specimen at different microcrack time, when the age is 90 days,The flexural strength and fatigue life of cement-stabilized macadam before and after micro-crack were measured by flexural strength test and fatigue test, and the test results were analyzed.The variation of fatigue life of cement stabilized macadam after microcrack was studied, and the fatigue equation of micro-crack was established by using Weibull distribution.The results show that the fatigue life of cement stabilized macadam before and after microcrack decreases linearly with the increase of stress level, and the fatigue life of cement stabilized macadam before and after microcrack is 20% and 30% respectively.The fatigue life of cement-stabilized macadam is basically the same as that of non-micro-crack. The fatigue life of cement-stabilized macadam with 40% microcrack is relatively lower, but it is still within the range of application requirement.The microcrack time has no significant effect on the fatigue test results.
【作者单位】：河北工业大学土木与交通学院;
【基金】：河北省高等学校科学技术研究项目(ZD2014099)
【分类号】：U414

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