Large-volume ultra-high-performance concrete thermal curing system and thermal curing process

Abstract

The invention discloses a large-volume ultra-high performance concrete thermal curing system and a thermal curing process, and belongs to the technical field of bridges and related civil engineering, a thermal insulation shed is arranged on large-volume UHPC concrete and encloses the periphery, and a steam heating device is arranged on the ground around the large-volume UHPC concrete in the thermal insulation shed; a temperature adjusting device is arranged at the bottom of the large-volume UHPC concrete; the system provides a solution for uniformly heating and cooling the large-volume UHPC concrete in a front-back, up-down, left-right all-dimensional controllable temperature difference manner, and the temperature difference between a core part and a surface can be intelligently stabilized between 5 DEG C and 15 DEG C in the curing heating and cooling stages, so that the cracking risk of the large-volume UHPC concrete structure is greatly reduced, and the engineering quality is improved; meanwhile, due to the fact that the absolute temperature rise of the UHPC concrete structure is large generally and the traditional cooling time is long, the system can achieve rapid cooling through gradient constant-temperature water, and it can be ensured that the temperature difference between the inner surface and the outer surface is within a controllable set value. The construction period is shortened, and the project comprehensive cost is effectively reduced.

Description

technical field [0001] The invention relates to the technical field of bridges and related civil engineering, in particular to a large-volume ultra-high-performance concrete thermal curing system and a thermal curing process. Background technique [0002] Ultra-High Performance Concrete, referred to as UHPC (Ultra-High Performance Concrete), UHPC can be regarded as the engineering material with the best durability. The mechanical properties of UHPC with proper reinforcement are close to that of steel structure, and UHPC has excellent wear resistance and anti-knock performance. Therefore, UHPC is particularly suitable for long-span bridges, anti-explosion structures (military engineering, bank vaults, etc.) and thin-walled structures, as well as in highly abrasive and corrosive environments. At present, UHPC has been applied in some practical projects, such as long-span pedestrian bridges, highway and railway bridges, thin-walled silos, nuclear waste tanks, steel cable anchor...

AI Technical Summary

Problems solved by technology

This cooling method cannot achieve simultaneous heating and cooling. There are not many practical engineering cases of large-volume ultra-high performance concrete at present, and the traditional large-volume ordinary concrete curing process is basically adopted. The absolute temperature rise is twice that of ordinary concrete. When the absolute temperature of large-volume ultra-high performance concrete is high, there will inevitably be a huge internal and external temperature difference, which will increase the risk of structural cracking. At the same time, the cooling will be slower, the construction period will be longer, and the efficiency will be low.

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