Research Article

Crack Risk Evaluation of Early Age Concrete Based on the Distributed Optical Fiber Temperature Sensing

Table 1

Crack risk evaluation level under different anticrack safety factor.

Crack risk levelEvaluation resultsAnalysis and possible solutions

I2.0Quite safe(i) Due to the strict temperature controlling measures, the minimum stress ratio is quite high, which means the low level of crack risk.
(ii) The high value of the minimum stress ratio may increase the cost of temperature controlling.

II1.5–2.0Acceptable(i) The minimum stress value means the crack risk is under control according to the code of arch dam.
(ii) No additional temperature controlling measures are needed and the proposed temperature controlling is highly recommended.

III1.0~1.5Unacceptable(i) Since this project is classified into the first level structures, this stress ratio may lead to possible potential risk of the dam block.
(ii) The preliminary temperature measures are acceptable, but additional measures are needed.

IV1.0High risk(i) The value of minimum stress ratio is quite low compared with that of Code of Arch Dam, which may lead to potential failure of the dam.
(ii) The proposed temperature controlling measures are totally unacceptable, and the restudy is needed.