相变材料在桥梁系梁工程中的应用研究

Research on Application of Phase Change Material in Bridge Tie Beam Engineering

该文介绍了相变材料的工作原理及特点,并针对某大桥系梁工程部位的大体积混凝土抗裂问题,提出了利用高导热复合相变材料替代冷却水管对系梁大体积混凝土进行温控,并进行了工程应用。结果表明,掺入3 kg/m3高导热复合相变材料的系梁大体积混凝土在降低混凝土温峰、升降温速率、里表温差、应力应变等方面的效果均优于布设冷却水管的混凝土。相较于布设冷却水管的系梁,掺入3 kg/m3高导热复合相变材料后的系梁温峰降低0.5℃~1.9℃,最大里表温差降低2.1℃~5.8℃,最大应力值降低0.3~1.5 MPa,具有更好的控温防裂效果。同时,掺入3 kg/m3高导热复合相变材料对混凝土的工作性能和力学性能影响较小。

This article introduced the working principle and characteristics of phase change materials.Aiming at the crack resistance problem of mass concrete in a bridge tie beam engineering part,it was proposed to use high thermal conductivity composite phase change materials to replace the cooling water pipes to tie beam mass concrete to carry out temperature control and engineering application.The results show that the tie beam mass concrete mixed with high thermal conductivity composite phase change material is better than concrete with cooling water pipes in reducing concrete temperature peak,temperature rise and fall rate,internal and external temperature difference,stress and strain.Compared with the tie beam which with the cooling water pipe,the temperature peak of the tie beam which mixed with 3 kg/m3 phase change material was reduced 0.5℃-1.9℃,the maximum temperature difference between the inside and the surface was reduced by 2.1℃-5.8℃,and the maximum stress was reduced by 0.3-1.5 MPa.,with better temperature control and crack prevention effect.At the same time,the mixing of 3 kg/m3 high thermal conductivity composite phase change material has little effect on the working performance and mechanical properties of concrete.