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From Part 1, the experimental data of chloride threshold level (CTL) are obtained. With the experimental data, the mechanism of influence of temperature, pitting potential, w/c ratio and air-entraining agent on CTL are discussed in this paper. Lower temperature causes higher CTL by reduce the rate of chemistry reaction. As pitting potential increasing, the CTL will decrease approximately linearly. W/c ratio and air-entraining can lead to higher porosity and weaken the alkaline environment, so as to reduce the CTL. Introduction Chloride threshold level(CTL) is one of the key parameters needed for service life prediction of concrete structures[1]. CTL depends on numerous factors[2], on which there are many research papers have been studied[3-7]. However, there are still some limitations of these researches. Most measurements of CTL were performed using a synthetic concrete solution[2], while only a few measurements were performed in mortar specimens[8-10]. Meanwhile, CTL at room temperature was more popular in research than at low temperature. However, assessment of the CTL at low temperature is a key element in predicting the service life of structures in cold regions exposed to chlorides. From Part 1, the experimental data of CTL at room and low temperature are obtained. With the results, the influence factors of CTL are discussed in this paper. Also, with the combination of other scholars' research, the relationship between CTL and temperature (from -20°C to 50 °C ) is researched. Results and discussion Influence of temperature on CTL. Fig. 1 shows the free chloride threshold level for different concrete and different pitting potential. From the figures, it's apparent that CTL at -20°C is higer than CTL at room temperature under the same condition. When the pitting potential is low, the CTL at -20°C is approximately 30% higher than at room temperature..

Experimental research on chloride threshold level at low temperature: Part2 discussion