分级时效处理，低温下先让合金内部的宏观应力松弛，再在较高温度下时效，可有效地避免棒材纵向开裂。

However, stepped aging, which relaxes internal macro-stress under lower temperature then ages under higher temperature, can avoid longitudinal cracks effectively.

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结合监理工作中的实践，对高填方路段路面纵向开裂的成因进行了分析，提出了预防措施。

Combining with the experience of supervising, the paper analyses the reasons of the longitudinal craze of surface with high filling and puts forward the precautionary measures.

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本文从设计、施工、材料等方面论述了预制楼板板缝纵向开裂产生原因及防治措施。

This paper states the causes and prevention measure of longitudinal crazing of joints of pre - cast floor slab from the aspects of design, construction and material.

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