This is especially important on a concrete roof, since concrete is a live material which can dilatate with high temperature and create movements on the roof.
在混凝土屋顶上尤其突出，因为混凝土是一种活性建筑材料，高温时会产生膨胀并导致移动。
3
To observe and analyze the phase transformations characteristics of 35 steel during cooling after continuous heating with dilatate method and metallography microscope.