Steam-curing constant-temperature thermal insulation system for large-area inclined concrete pavement

Abstract

The invention discloses a steam-curing constant-temperature thermal insulation system for a large-area inclined concrete pavement. The steam-curing constant-temperature thermal insulation system comprises a steam-curing frame and a thermal insulation layer, wherein the steam-curing frame is mounted on cast-in-place concrete, the thermal insulation layer covers the surface of the steam-curing frameto form a steam-curing space, the steam-curing frame is formed by splicing multiple standard partitioning net frames, the steam-curing space is formed by multiple steam-curing sub-bins, and a sub-bingap is formed between the standard partitioning net frames of every two adjacent steam-curing sub-bins; and the thermal insulation layer comprises a bottom sealing layer, a middle thermal insulationlayer and a top sealing layer, the thermal insulation layer around the cast-in-place concrete is covered with a sealing compaction material, the bottom sealing layer is compacted to get close to the surface of the concrete at the sub-bin gap by virtue of a compaction rod so as to form relatively independent steam-curing sub-bins, and each steam-curing sub-bin is provided with a steam inlet pipe and a temperature sensor. By arranging the steam-curing sub-bins with reasonable sizes, steam in each steam-curing sub-bin can be uniformly distributed, so that the integral concrete is uniformly heated; and meanwhile, the steam-curing constant-temperature thermal insulation system is strong in assembling property and applicability and easy to mount and dismount.

Description

technical field [0001] The invention relates to the field of concrete high-temperature steam curing equipment, in particular to a large-area cast-in-place active powder concrete steam curing and heat preservation system. Background technique [0002] The steam curing of concrete has a great influence on the development of its elastic modulus and strength, including the generation and development of cracks; during the construction process, due to curing defects, the strength and elastic modulus of concrete are insufficient, and cracks occur from time to time. In particular, for reactive powder concrete (RPC), its water-binder ratio is very low (generally less than 0.25), and the autogenous shrinkage and drying shrinkage are likely to cause dangerous cracks; therefore, steam curing is often required to complete the shrinkage reaction quickly And reduce the occurrence of cracks; at the same time, steam curing can effectively enhance the elastic modulus, strength and durability ...

AI Technical Summary

Problems solved by technology

The existing steam curing devices are usually relatively simple, that is, panels or insulation materials are used to enclose the surrounding and top, and the middle is supported by brackets with exhaust ports and cooling ports. The thermal insulation performance is poor, which not only affects production efficiency, but also Increase the consumption of fuel and power, especially there is currently no equipment suitable for large-area, long-span concrete steam curing needs

When the cast-in-place pavement concrete is steamed, the width is at least 8m or more, and the length is generally more than 200mm; and there are high longitudinal and transverse slopes on the pavement, and the density of high-temperature steam is lower than that of air, so it is easy to concentrate and circulate to the higher places of the pavement concrete. As a result, the steam is not evenly distributed in the shed during large-scale steam curing, so that the steam curing conditions of the concrete in various places are different, and cracks due to temperature differences are prone to appear.

In addition, the concrete surface of the pavement is generally uneven, and if steel pipes are used for compaction, the surroundings cannot be continuously compacted, which will easily cause heat loss. Therefore, the sealing performance of the steam-cured thermal insulation structure is also the main problem to be solved

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