On-site temperature control standard for mass concrete

1. The layout of monitoring points in the mass concrete pouring body should be based on the principle that it can truly reflect the maximum temperature rise in the concrete pouring body, the temperature difference between the core and the surface layer, the cooling rate and the ambient temperature.

2. The layout range of monitoring points is based on the half axis of the symmetry axis of the selected concrete pouring body plan as the test area, and the layout of monitoring points in the test area should consider its representative layered layout; on the symmetry axis of the foundation plane, The number of monitoring points should not be less than 4, and the layout should fully consider the geometric size of the structure.

3. Along the thickness direction of the concrete pouring body, the surface, bottom surface and central temperature measuring points should be arranged, and the spacing of other measuring points should not be greater than 600mm.

4. The measurement of the temperature difference between the core and the surface of the large-volume concrete pouring body, the cooling rate, the ambient temperature and the strain should be measured no less than 4 times a day and night after the concrete is poured; the measurement of the mold entry temperature should be no less than 2 times per shift Second-rate.

5. The surface temperature of the concrete pouring body should be based on the temperature within 50mm of the concrete surface.

6. When measuring the temperature of concrete, the thermometer should not be affected by the outside air temperature, and should be left at least 3mm in the temperature measuring hole. According to the conditions of the construction site, the temperature of the concrete can be detected by using embedded thermometers such as thermocouples and thermistors.

7. During the temperature measurement process, the temperature change curve of each point and the temperature distribution curve of the section should be drawn in time.