A variety of factors combine in different pre-set depth and width of cracks or the way of using load to produce cracks, and then test.

结合各种因素预先设置了不同深度和宽度的裂缝或利用加载方式使其产生裂缝，然后进行检测。

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Based on an experimental study on 25 FRC beams, variables that affect the width of cracks in steel fiber reinforced high-strength concrete beams under normal service conditions are studied.

通过25根钢筋钢纤维混凝土梁的试验，研究了影响钢纤维高强混凝土梁在正常使用极限状态下裂缝宽度的各种因素。

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The reason of wall cracks is analyzed, the standard problems of crack width are stated and the preventive methods and measures in the design and construction are presented for reference.

本文分析了墙体裂缝的产生原因，阐述了裂缝宽度的标准问题，并提出了在设计、施工中相应采取的防治方法和措施，供大家参考。

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"In the lab we have been able to show healing of cracks with a width of 0.5mm - two to three times higher than the norms state, " Dr Jonkers explained.

BBC: Key test for re-healable concrete

Her neighbor, a 34-year-old man who wouldn't give his name, pointed to the damage his own house had sustained, including cracks of five to 10 centimeters in width.

WSJ: Rescuers Work to Reach Quake Area

Her neighbor, a 34-year-old man who wouldn't give his name, pointed to the damage his own house had suffered, including cracks of five to 10 centimeters in width.

WSJ: Death Toll From China Quake Rises to 186