干冰清洗对混凝土表面损伤影响分析

发布时间：2018-06-12 14:09

本文选题：混凝土 + 干冰清洗　；参考：《重庆大学学报》2014年08期

【摘要】：采用KBQX-30DG单管干冰清洗机进行混凝土干冰清洗试验,结果表明清洗效果好,但试块表面会产生孔隙。基于正交试验,研究了清洗过程中的4个因素(干冰流量、清洗距离、清洗时间及喷射角度)对混凝土表面孔隙的影响。运用极差分析法对数据进行处理,结果表明干冰流量对表面孔隙率增长量影响明显,随着干冰流量的增加,表面孔隙率增长量增加,当干冰流量大于1.54kg/min时,表面孔隙率增长量剧增;喷射角度对表面孔隙率增长量的影响较明显,喷射角度在55°~60°及85°~90°范围内,对表面孔隙率增长量多于喷射角度在65°~70°及75°~80°范围内;清洗距离与清洗时间对表面孔隙率增长量影响不明显。运用线性回归分析及层次分析法得到各因素的权值,通过权值计算得到的各因素对表面孔隙率增长量影响的主次顺序与极差分析相一致。各因素对表面孔隙率增长量的影响为隧道干冰清洗提供了一定的理论基础。
[Abstract]:KBQX-30DG single pipe dry ice cleaning machine was used to clean concrete dry ice. The results show that the cleaning effect is good, but the surface of the sample will produce pores. Based on orthogonal test, the effects of four factors (dry ice flow, cleaning distance, cleaning time and spray angle) on the surface porosity of concrete were studied. The data were processed by the range analysis method. The results show that the dry ice flow rate has an obvious effect on the surface porosity growth. With the increase of the dry ice flow rate, the surface porosity increases, and when the dry ice flow rate is greater than 1.54kg/min, the surface porosity increases with the increase of the dry ice flow rate. The effect of jet angle on the increase of surface porosity is obvious. The increase of surface porosity in the range of 55 掳~ 60 掳and 85 掳~ 90 掳is more than that of jet angle in the range of 65 掳~ 70 掳and 75 掳~ 80 掳. The effect of cleaning distance and cleaning time on the increase of surface porosity is not obvious. The weight of each factor is obtained by linear regression analysis and analytic hierarchy process. The primary and secondary order of the influence of each factor on the increase of surface porosity is consistent with the range analysis. The influence of various factors on the increase of surface porosity provides a theoretical basis for tunnel dry ice cleaning.
【作者单位】：重庆大学煤矿灾害动力学与控制国家重点试验室;
【基金】：国家重点基础研究发展计划(973计划)资助项目(2009CB724606;2009CB724603) 国家自然科学基金资助项目(51074198) 中央高校基本科研业务费资助项目(CDJZR10240017) 重庆市科委自然科学基金计划资助项目(2010BB6044)
【分类号】：TU528

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