The factors influencing the corrosion depth including the porous volume of concrete, thickness of concrete cover, diameter of rebar and the corrosion expansion rate are analyzed.

分析了影响混凝土保护层胀裂时钢筋锈蚀深度的各个因素，包括混凝土水泥石毛细孔的体积、混凝土保护层的厚度、钢筋直径和铁锈膨胀率。

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To improve the volume expansion rate, lower the density of pp foam, gas escaping should be avoided by selecting the appropriate die temperature.

优选适宜的发泡机头温度可以抑制气体逃逸，提高发泡倍率，获得更低密度的聚丙烯发泡材料。

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