Journal of Jilin University(Engineering and Technology Edition) ›› 2021, Vol. 51 ›› Issue (1): 233-244.doi: 10.13229/j.cnki.jdxbgxb20190937

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Colorimetry method in assessing fire-damaged concrete

Ya WEI1(),Wei-kang KONG2,Cheng WAN1,Yong-zhi ZUO3,Qiao-zhi LU3   

  1. 1.Department of Civil Engineering，Tsinghua University，Beijing 100084，China
    2.Shanxi Provincial Major Laboratory for Highway Bridge and Tunnel，Chang′an University，Xi′an 710064，China
    3.Beijing Building Construction Research Institute，Beijing 100039，China
  • Received:2019-07-26 Online:2021-01-01 Published:2021-01-20

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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

CLC Number: 

  • TB321

Fig.1

Combination ratio of all colors in RGB color space and XYZ color space"

Fig.2

Combination ratio of all colors in XYZ color space"

Fig.3

Photos taken under condition of daylight-auto white balance for C30 concrete after heating for 1 h"

Fig.4

Photos taken under condition of daylight-manual white balance for C30 concrete after heating for 1 h"

Fig.5

Chromaticity diagram of C30 concrete with photos taken under conditions of daylight-auto white balance"

Fig.6

Chromaticity diagram of C30 concrete with photos taken under conditions of daylight-manual white balance and local diagram and trend lines of C30 concrete heated at 200~400 ℃ and 400~800 ℃"

Fig.7

Chromaticity diagram of C30 concrete with photos taken under conditions of fluorescent-manual white balance"

Fig.8

Chromaticity diagram of C30 concrete heated for 1 h and 3 h with photos taken under condition of daylight- manual white balance and local diagram and trend lines of C30 concrete heated at 200~800 ℃"

Table 1

Linear distribution of coordinates of concrete color in chromaticity diagram under condition of daylight and manual white balance, and linear equation y=ax+b"

水泥型号加热时间温度/℃abR2x范围来源
C301 h2000.92580.06070.9700(0.323, 0.335)图6
4000.89240.06870.9747(0.324, 0.334)
6000.90020.06580.9914(0.312, 0.322)
8000.89510.06740.9659(0.308, 0.311)
3 h2000.93480.05880.9674(0.318, 0.334)图8
4000.88750.07080.9912(0.321, 0.332)
6000.88850.06940.9715(0.311, 0.318)
8000.89080.06880.9582(0.308, 0.311)
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