Method for controlling maximum temperature of large-volume normal-temperature concrete

Abstract

The invention provides a method for controlling the maximum temperature of large-volume normal-temperature concrete. The method comprises the following steps that 1, a to-be-poured bin surface material supply plan is formulated, and a batching plan is started; 2, an aggregate is transferred to an aggregate temporary storage bin for temporary storage, when the environment temperature T0 is continuously lower than or equal to a set temperature, the aggregate is conveyed to a mixing system through an ascending sealing-tape machine, and when the environment temperature T0 is continuously higher than the set temperature, the aggregate is conveyed to an aggregate temperature control system through the ascending sealing-tape machine to be cooled; 3, mixing water, fly ash, cement, an additive and the aggregate are mixed; 4, transporting to a pouring bin surface is achieved by adopting a transportation system; 5, before a pouring bin is opened, the environment temperature T4 outside the bin and the environment temperature T3 inside the bin are monitored and controlled; and 6, after warehousing is achieved, flattening, vibrating and covering are completed. According to the method for controlling the maximum temperature of the large-volume normal-temperature concrete, the temperature of the aggregate storage bin in concrete raw materials is properly adjusted by using low-temperature river water, and low-heat cement concrete and normal-temperature water are mixed, so that the concrete mixing efficiency is greatly improved.

Description

technical field [0001] The invention relates to the technical field of hydropower project dam concrete construction, in particular to a method for controlling the maximum temperature of large-volume normal-temperature concrete. Background technique [0002] The quality of dam concrete construction in hydropower projects is directly related to the operation safety of the entire life cycle of the entire hub project. The construction quality of dam concrete is directly controlled by the pouring efficiency and the level of temperature control and anti-cracking construction. The temperature control and anti-cracking of dam concrete often leads to a decrease in pouring efficiency, which in turn affects the construction progress. The most important thing in dam temperature control and crack prevention is to control the maximum temperature inside the concrete, which is the most effective means to reduce concrete cracks. In the existing arch dam concrete construction technology, mos...

AI Technical Summary

Problems solved by technology

Although this construction method can control the maximum temperature of concrete to a certain extent, liquid ammonia is often used as a coolant for pre-cooling concrete aggregates, which not only wastes energy, but also has great safety hazards. At the same time, ice water is used for mixing It will prolong the concrete mixing time, affect the "one-stop" concrete pouring efficiency and mixing quality, and restrict the construction progress

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