The main causes of bottom flat crack are analyzed, mainly including radial force generated by closure strands stretching in middle span , non-structural elements and construction effects , etc.

分析了导致底板崩裂的主要原因，主要包括跨中合龙束张拉时产生的径向力作用、非预应力钢筋构造因素及施工影响等；

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The paper analyzes the cause of crack and precaution for fly ash and clay flat tile. And specializes the crack cause, such as structure, machine, wind, unsuitable operation and warp, etc.

介绍粉煤灰粘土平瓦在干燥过程中产生结构裂纹、机械性裂纹、风致裂纹、操作裂纹和翘曲变形的原因及消除方法。

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The artificial stone table top has high strength, flat surface, high brightness, engine oil permeation resistance, and no crack and air hole.

该人造石台面的强 度有大幅度提高，而且表面平整度高、光泽好；防机油渗透；无裂纹和气孔。

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