Inspection and Assessment of the Defects of Exterior Walls Cement Coating
-
摘要: 开展了不同外界环境条件下红外热像法检测建筑外墙饰面层粘结缺陷的试验，分析了天气状况、检测时段、室外温度等对检测结果的影响，对现行技术规程中红外热像法检测建筑外墙饰面层粘结缺陷的适宜条件进行了改进;结果表明，阴天以及室外温度低于10℃时，红外热像检测易遗漏小尺寸的粘结缺陷。建立了基于图像处理的外墙饰面层粘结缺陷面积评定方法，该方法可有效、定量地提取估算外墙饰面层空鼓区域的面积；基于该方法的图像处理分析结果表明，室外温度越高、空鼓面积越大、空鼓深度位置越浅，红外热像法的检测效果越好,而空鼓厚度对检测效果影响不明显。Abstract: Infrared thermography method was used to inspect the defects of exterior walls cement coating under different environmental conditions. The effects of weather conditions, test time in a day and outdoor temperatures on the test results were analyzed, and the suitable conditions in the current technical specifications for defects inspection of exterior walls cement coating using infrared thermography method were modified. The experimental results showed that, the defects of small size were easily to be omitted by mistake in a cloudy day or when the outdoor temperature was lower than 10℃. The method for evaluating the area of bonding defects was proposed based on the image processing of infrared thermography method. The proposed method was effective and quantitative for extracting the area of exfoliation of cement coating. The image processing analysis results showed that, the inspecting result of infrared thermography method was better when at higher outdoor temperature, with larger area and more shallow depth of exfoliation of cement coating. The effect of the thickness of exfoliation of cement coating was not obvious on the inspecting result of infrared thermography method.
-
-
[1] DATCU S, IBOS L, CANDAU Y, et al. Improvement of building wall surface temperature measurements by infrared thermography［J］. Infrared Physics & Technology, 2005, 46(6): 451-467. [2] MAHABOONPACHAI T, KUROMIYA Y, MATSUMOTO T. Experimental investigation of adhesion failure of the interface between concrete and polymer-cement mortar in an external wall tile structure under a thermal load［J］. Construction and Building Materials, 2008, 22(9): 2001-2006. [3] 张荣成. 红外热像法检测建筑物外墙饰面施工质量的试验研究［J］. 建筑科学, 2002, 18(1): 40-44. [4] 袁昕, 谢慧才, 陈高峰. 建筑物外墙饰面砖粘贴质量的红外热像检测试验研究［J］. 四川建筑科学研究, 2003, 29(2): 43-45. [5] 冯力强, 王欢祥, 晏大玮, 等. 红外热像法检测建筑外墙饰面层内部缺陷试验研究［J］. 土木工程学报, 2014, 47(6): 51-56. [6] EDIS E, FLORES-COLEN I, DE BRITO J. Passive thermographic inspection of adhered ceramic claddings: limitation and conditioning factors［J］. Journal of Performance of Constructed Facilities, 2012, 27(6): 737-747. [7] 张德芳. 红外热像法检测外墙饰面空鼓缺陷时结果的可靠性［J］. 工程质量, 2013, 30(11): 73-75. [8] 李芸, 刘永福, 周宏, 等. 红外热像法检测外墙饰面砖黏结缺陷的应用研究［J］. 住宅科技, 2014, 34(1): 52-54. [9] ABDEL-AZIZ Y I, KARARA H M. Direct linear transformation from comparator coordinates into object space coordinates［C］∥Proceedings of the ASP Symposium on Close-Range Photogrammetry. Falls Church, VA: American Society of Photogrammetry, 1971:1-18. [10] OSTU N. A threshold selection method from gray-level histograms［J］. IEEE Trans, 1979, SMC-9: 62-66.
计量
- 文章访问数: 3
- HTML全文浏览量: 0
- PDF下载量: 2
下载:
