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1.为什么水泥混凝土面层要设置纵横缝? 当温度变化或地基变形时,水泥混凝土会发生收缩或膨胀,由于混凝土一经面层和垫层(或底层)之间有摩擦和粘结现象,会阻止混凝土胀缩移动,因而引起附加应力。所以可能使混凝土面层产生裂缝。同时,温度的变化也会使水泥混凝土版的上面和底面发生不平衡的伸缩。不同地区、不同季节会使上面和底面的温度有很大差别(甚至大到10℃至20℃);版越厚,温差越大,这就会使附加应力增大。至于地基变形产生不均匀的上升或下沉,都会使混凝土版内产生应
1. Why cement concrete surface to set the vertical and horizontal joints? When the temperature changes or foundation deformation, shrinkage or expansion of concrete will occur, due to the concrete surface layer and cushion (or the bottom) between the friction and bonding phenomenon, will Prevent the concrete from expanding and contracting, thus causing additional stress. So may make the concrete surface layer cracks. At the same time, changes in temperature also cause unbalanced expansion and contraction of the top and bottom of the cement concrete panel. Different regions, different seasons will make the top and bottom of the temperature is very different (even as large as 10 ℃ to 20 ℃); plate thicker, the greater the temperature difference, which will make the additional stress increases. As for the uneven deformation of the foundation rise or sink, will produce concrete version should be