干冰清洗对混凝土表面损伤影响分析
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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)


Influence analysis of dry ice cleaning to the concrete surface pore
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    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1.54 kg/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:

    The result of concrete dry ice cleaning test with KBQX-30DG,which is a single tube dry ice cleaning machine,shows cleaning effect is good,but can make pore on the concrete surface. Based on the orthogonal experiment design method,study the four factors of dry ice flow,cleaning distance,cleaning time and injection angle in the process of dry ice cleaning how to affect the surface porosity growth. The range analysis results show that the most important factor to the surface porosity growth is dry ice flow. With the dry ice flow increase,the surface porosity growth increased,and the surface porosity growth will leap when the dry ice flow is greater than 1.54 kg/min;the injection angle has obvious influence on the surface porosity growth,when injection angle is in the scope of 55°~60°and 85°~90°,and the amount of pore is more than these in the scope of 65°~70°and 75°~80°;the influence on the surface porosity growth of cleaning distance and cleaning time is not obvious. By linear regression analysis and AHP we can obtain the weights on the surface porosity growth of four factors’ through which we can get the primary and secondary order of each factor,and the result is consistent with the range analysis.

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任松,师燕滑,姜德义,陈结.干冰清洗对混凝土表面损伤影响分析[J].重庆大学学报,2014,37(8):83-90.

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  • 收稿日期:2014-04-08
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  • 在线发布日期: 2014-10-30
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