比色法检测受火后混凝土损伤程度

doi:10.13229/j.cnki.jdxbgxb20190937

摘要/Abstract

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。

关键词: 混凝土颜色, 色度图, 比色法, 受火损伤, RGB值

Abstract:

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.

Key words: concrete color, chromaticity diagram, colorimetry method, fire-damage, RBG value

中图分类号:

TB321

魏亚,孔维康,万成,左勇志,鲁巧稚. 比色法检测受火后混凝土损伤程度[J]. 吉林大学学报(工学版), 2021, 51(1): 233-244.

Ya WEI,Wei-kang KONG,Cheng WAN,Yong-zhi ZUO,Qiao-zhi LU. Colorimetry method in assessing fire-damaged concrete[J]. Journal of Jilin University(Engineering and Technology Edition), 2021, 51(1): 233-244.

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水泥型号	加热时间	温度/℃	a	b	R²	x范围	来源
C30	1 h	200	0.9258	0.0607	0.9700	(0.323, 0.335)	图6
		400	0.8924	0.0687	0.9747	(0.324, 0.334)
		600	0.9002	0.0658	0.9914	(0.312, 0.322)
		800	0.8951	0.0674	0.9659	(0.308, 0.311)
	3 h	200	0.9348	0.0588	0.9674	(0.318, 0.334)	图8
		400	0.8875	0.0708	0.9912	(0.321, 0.332)
		600	0.8885	0.0694	0.9715	(0.311, 0.318)
		800	0.8908	0.0688	0.9582	(0.308, 0.311)