论文部分内容阅读
21世纪90年代后,随着桥梁技术的突飞猛进,大体积混凝土在桥梁结构中应用的越来越多且体积逐渐增大,由几百立方米到几万立方米。因此,对于大体积混凝土施工提出了更高的要求。现代桥梁中时常涉及到的大体积混凝土施工,它主要的特点是体积大,一般实体最小尺寸≥1m。由于其体积大,表面小,水泥水化热释放比较集中,内部温升比较快,当混凝土内外温差较大时,会使混凝土产生温度裂缝,影响结构安全和正常使用,所以必须从根本上分析它,来保证施工的质量。
After the 1990s, as bridge technology advances by leaps and bounds, mass concrete is used more and more in the bridge structure and its volume gradually increases from several hundred cubic meters to tens of thousands of cubic meters. Therefore, for the mass concrete construction put forward higher requirements. Massive concrete often involved in modern bridges construction, its main feature is bulky, the general entity minimum size ≥ 1m. Because of its large size and small surface, cement hydration heat is concentrated, the internal temperature rise faster, when the temperature difference between inside and outside the concrete will make the concrete temperature cracks, affecting the structural safety and normal use, it must be fundamentally analyzed It, to ensure the quality of construction.