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前言应用冷混凝土的关键是选择适宜的防冻剂和确定合理的掺量。通常我们都是以气温作为确定冷混凝土防冻剂掺量的标准,并以此决定其使用温度范围,或者通过不同防冻剂和不同掺量的冷混凝土试件在各种负温下进行物理、力学性能试验来确定防冻剂的掺量。但是,有些体积较大的混凝土结构,如大体积的混凝土基础,水工混凝土结构等,由于体积较大,混凝土中的热量不易散失,加之水化热释出,使冷混凝土在硬化初期的温度比周围气温高很多。此外,为了防止混凝土内外温差过大而产生裂缝,以及为了减
Introduction The key to the application of cold concrete is to select suitable antifreeze and determine a reasonable amount. Usually, we use air temperature as the standard for determining the amount of antifreeze in cold concrete, and determine the temperature range of the antifreeze, or use different antifreeze and different amount of cold concrete to perform physics and mechanics at various negative temperatures. Performance tests to determine the amount of antifreeze. However, some of the larger concrete structures, such as large concrete foundations, hydraulic concrete structures, etc., due to the large volume, the heat in the concrete is not easy to lose, coupled with the release of hydration heat, so that the cold concrete in the early hardening temperature It is much higher than the surrounding temperature. In addition, cracks are generated to prevent the temperature difference between the inside and outside of the concrete from being excessive, and to reduce