Study on Simulation Test of Mass Machine-Made Sand Concrete Pouring

The mass concrete structure is relatively thick, and the concrete pouring volume is large. During the pouring process, the cement will produce large hydration heat when it is hydrated and hardened, causing a large temperature difference between the inside and outside of the structure, leading to structural cracking, which seriously affects the late strength, working performance and service life of the concrete structure. In this paper, the temperature field during the pouring process of machine-made sand concrete is numerically simulated, and the variation law of the temperature field with different pouring processes is analyzed. The following conclusions are drawn: (1) Under the secondary pouring condition, the maximum temperature of the first pouring is in the concrete stratum and presents the law of temperature decreasing from the bottom layer core to the surrounding, and the maximum temperature reaches 60°; At the beginning of the second layer of concrete pouring, the maximum temperature is 48° at the bottom of the whole. With the overall temperature rising, the maximum temperature at the middle of the second layer reaches 72°. (2) For mass concrete poured in one time as a whole, in the early stage of concrete pouring, the temperature gradually rises from the casting temperature to the maximum temperature, and the temperature distribution is like an open cover pool. As time goes on, the maximum temperature range gradually shrinks to the center, and the maximum temperature increases first and then decreases with time. The maximum temperature of one-time overall pouring reaches 72°.