我国广阔的东北、华北、西北地区,每年都有较长的冬季在这些地区施工的混凝土和钢筋混凝土结构物,很长时期是处于负温度和正负温度交替中使用,冻结和冻融作用对混凝土强度和力学性能影响较大。大家都知道,混凝土在常温条件下,抗压强度与抗拉强度轴心受压强度,受压弹性模量,混凝土和钢筋的粘结强度等指标保持相应的比例系数关系,但在负温条件下,由于负 China’s vast northeastern and northwestern regions and northwestern regions each year have relatively long winter construction of concrete and reinforced concrete structures in these areas. For a long period of time, they are used in negative temperature and alternating positive and negative temperatures, freezing and thawing Concrete strength and mechanical properties have a greater impact. As we all know, concrete at room temperature, the compressive strength and tensile strength of the axial compressive strength, compressive elastic modulus, concrete and steel bond strength and other indicators to maintain the appropriate proportionality coefficient, but in negative temperature conditions Under, due to negative