大体积承台混凝土浇筑温控技术研究

Study on Temperature Control Technology of Mass Concrete Pouring of Base Slab

摘要:

嘉松公路越江新建工程主墩承台厚度5 m，由于产生的水化热较大，其内部温度较高。为了保证大体积混凝土的施工质量，对其施工的温控技术进行研究。着重对有冷却水管和无冷却水管的大体积混凝土的入模温度、最高温升、降温速率等数值进行对比和分析，明确温控的测位测点布置、冷却水管的布置及循环水的加水位置。结果表明：设置冷却水管能有效降低混凝土的最大拉应力，减少大体积混凝土应力超限部位，确保混凝土满足抗裂要求，提高工程质量。

Abstract:

The thickness of the main pier base slab of the Jiasong Highway Cross-river Project is 5 m. Due to the relatively large generation of hydration heat, its internal temperature is higher. To ensure the quality of mass concrete construction, the temperature control technology of mass concrete construction is studied. The focus is on the comparison and analysis of the pouring temperature, the peak temperature rise, the cooling rate and the other numerical values of mass concrete with and without cooling pipes so as to clarify the layout of temperature measurement points, the arrangement of cooling pipes and the addition of circulating water. The results demonstrate that the setting up of cooling pipes can effectively reduce the maximum tensile stress of concrete, reduce the areas where the stress of mass concrete exceeds the limit, ensure the concrete meeting the requirements of crack resistance, and improve the engineering quality.