比色法检测受火后混凝土损伤程度  

Colorimetry method in assessing fire-damaged concrete

作　　者：魏亚[1] 孔维康 万成 左勇志 鲁巧稚 WEI Ya;KONG Wei-kang;WAN Cheng;ZUO Yong-zhi;LU Qiao-zhi(Department of Civil Engineering,Tsinghua University,Beijing 100084,China;Shanxi Provincial Major Laboratory for Highway Bridge and Tunnel,Chang′an University,Xi′an 710064,China;Beijing Building Construction Research Institute,Beijing 100039,China)

机构地区：[1]清华大学土木工程系,北京100084 [2]长安大学陕西省公路桥梁与隧道重点实验室,西安710064 [3]北京市建筑研究院,北京100039

出　　处：《吉林大学学报（工学版）》2021年第1期233-244,共12页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目(51578316)。

摘　　要：传统的火灾灾后混凝土的损伤程度评估方法需要大量的实验工作,而其他一些新技术成本较高,适用性仍需进一步研究。针对这一问题,提出了一种基于光学分析的比色法,通过色度图中颜色坐标的移动来评价混凝土的热损伤。对C30混凝土立方体进行了火灾破坏实验,然后在日光与荧光、手动与自动白平衡条件下拍摄混凝土表面照片。建立了混凝土颜色坐标与其所受最高温度之间的关系的色度图,可以根据混凝土颜色确定混凝土所经历的最高温度,并建议在日光和手动白平衡条件下拍摄照片。研究结果将有助于提高混凝土火灾损伤评估的技术水平。The traditional methods for assessing the fire damaged concrete structures require large amount of experimental efforts,and some other new technologies are expensive and their applicability still needs further investigation. In view of this,a colorimetric method based on the optical analysis is proposed to evaluate the heating damage of the concrete in terms of the translation of the color coordinates in the chromaticity diagram. Fire damage experiment was first conducted on the C30 concrete cubes. And then photos were taken under the conditions of daylight vs. fluorescent and manual white balance vs. auto white balance. The chromaticity diagram is constructed to represent the relationship between the coordinates of the concrete colors and the maximum temperature that the concrete was subject to. The maximum temperature that the concrete experienced can thus be determined based on concrete color. The conditions under the daylight and the manual white balance are recommended to take photos for constructing chromaticity diagram. The results of this study will advance the technology for assessing fire-damaged concrete.

关 键 词：混凝土颜色 色度图 比色法 受火损伤 RGB值 

分 类 号：TB321[一般工业技术—材料科学与工程]