Thermal Characteristics Analysis Of Steam Curing Of Concrete Members In Prefabricated Residential Buildings

With the rapid development of fabricated buildings,steam curing was often used in construction to accelerate the solidification of concrete and shorten the curing time of concrete components.As a key link in the production of concrete components,if the system and process of steam curing could be correctly and reasonably and scientifically formulated,it was of great significance for the production of high-quality concrete components.The scientific and reasonable steam curing process could not only ensure the quality of the finished concrete components,but also significantly reduced the initial strength of the components and shortened the construction period of the assembled buildings,thus bringing huge economic and social benefits.In the steam curing process,because the hydration reaction of the cement in the concrete released the hydration heat,if the relevant parameters of the steam curing were not controlled,the concrete member was very prone to temperature stress due to the temperature gradient,and then cracks or deformations occurred,thus preventing and the control of temperature cracks and deformation was the most important task in the maintenance of concrete components.In this paper,the temperature field variation of the wall component with thermal insulation layer under the current steam curing system was simulated,and the temperature field characteristics were analyzed.By comparing the temperature field of the wall component without insulation layer,the process of producing the thermal insulation wall was found.The reason for the occurrence of warpage was to select the temperature difference of the fixed point in a section as a reference factor for judging the uniformity of the temperature distribution,and propose to modify and optimize the current steam curing system.The finite element analysis of the temperature field of the component under the steam curing system formulated in this paper was carried out.The temperature distribution and reference factor of the thermal insulation wall under the two systems were compared to verify the effectiveness of the proposed system in reducing warpage.The 650-type cylindrical members were also selected for simulation under two steam curing systems.The comparative analysis and verification verified the effectiveness of the proposed system in reducing the temperature difference of components and improving the yield.Taking the thermal insulation wall as an example to calculate the calorie consumption under the two systems,the actual steaming system proposed in this paper could save 20% of the energy.At the same time,different heating schemes were selected to compare and calculate the operating costs and gas emissions,which would provide reference for steam curing in the production of concrete components related to assembly houses.