大体积混凝土承台水化热分析与控制——以某产业园工程为例  

Analysis and control of hydration heat of the massive concrete pile cap——Based on the project of a industrial park

作　　者：胡佳鑫 王江营 李世雄 HU Jiaxin;WANG Jiangying;LI ShiXiong(Hunan No.6 Engineering Co.,Ltd.,Changsha 410015,Hunan,China)

机构地区：[1]湖南省第六工程有限公司,湖南长沙410015

出　　处：《工程建设》2024年第9期24-29,共6页Engineering Construction

基　　金：湖南建工集团科技攻关项目(JGJTK2022-52)。

摘　　要：为研究混凝土内部水化热分布情况,以某产业园工程大体积混凝土承台为研究对象,介绍了相关施工工艺和措施,并采用有限元软件建立三维仿真模型,研究了冷凝管的降温效果。结果表明:1)混凝土表面达到最高温度时的龄期约为2 d,之后降温较快,而混凝土中心区域在龄期范围为3~4 d时才达到峰值温度;2)在管内径为30 mm的管道中通入0.8 m/s的冷凝水时,冷凝管降温效果较好,混凝土内表温差均能控制在25℃以内,混凝土表面产生的拉应力小于混凝土的抗拉强度;3)混凝土龄期2 d后宜在其表面加盖毛毡,延缓表面混凝土的降温速度,控制内外温差。In order to study the hydration heat of concrete,focusing on a massive concrete pile cap of an industrial park project,this paper introduced relevant construction techniques and control measures,and built a three⁃dimensional model by finite element analysis to study the effect of cooling pipe.The results showed that the concrete surface takes about 2 days to reach the highest temperature but then cools quickly,while the core of concrete takes 3~4 days.Moreover,injecting 0.8 m/s water into a pipe with an inner diameter of 30 mm has a better cooling effect.The temperature difference between the surface and the interior of concrete can be controlled within 25℃,making the tensile stress on the concrete surface lower than the tensile strength.It is advisable to cover the concrete surface with felt after the age of 2 days,to delay the cooling of surface concrete and control the temperature difference between the surface and the interior.

关 键 词：大体积混凝土承台 水化热 管冷效果 有限元分析 

分 类 号：TU755.6[建筑科学—建筑技术科学]