Porous concrete will shrink, so it is necessary to deal with its shrinkage character firstly when studying the problems of joint location and reflection crack of porous concrete base.

由于多孔混凝土存在收缩现象，为研究多孔混凝土基层路面的接缝设置及反射裂缝问题，必须首先研究多孔混凝土的收缩特性。

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Character: high breaking tenacity, high modulus, low shrinkage, good creep-resistance and dimensional stability, one of the best reinfocement materials for semi-steel radial tire.

产品特点：强力高，模量高，收缩率低，抗蠕变性和尺寸稳定性优异，是生产半钢子午线轮胎最佳骨架材料之一。

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Mutual relation on molding shrinkage between central character and restriction character is studied, and connection formula is established.

研究了塑件“主特征”和“限定特征”对成型收缩的影响关系，建立了考虑塑件结构特征影响的收缩关系表达式。

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