Automatic monitoring system for concrete temperature and inversion analysis of hydration heat parameters in culvert projects
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Abstract:
To control the temperature and prevent cracks of concrete in culvert projects, we developed a fully automatic digital temperature measurement system. The hardware was composed of digital temperature sensors, an acquisition unit, and GPRS DTU. The software part included the central server and client software. The system has realized unattended operation, multi-point remote measurement, and real-time data sharing within the coverage of GPRS public wireless network. It is small in size, requires no wiring, runs steadily, and has high accuracy. Through several practical applications, it was proved to be stable and reliable. Based on the measured data and the numerical calculation of 3D unsteady temperature field, we retrieved the hydration heat parameters of a specific project. The specifications for P.O 42.5 were: m = 0.69, n = 0.56; and the inverted results were: m = 1.85, n = 0.79. According to these two groups of parameters, we calculated the 3D temperature stress, and obtained completely different results. The former did not exceed the standards, but the latter exceeded several standards and required crack-control measures to ensure the safety of the structure. Therefore, temperature monitoring and parameter inversion are very necessary for practical projects.
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