Concrete is strong in compression, but weak in tension its tensile strength varies from 8 to 14 percent of its compressive strength.

具体是在压缩强劲，但在张力弱：其拉伸强度变化从8至14%，其抗压强度。

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The viscosity and surface tension was improved by gel structure of bentonite colloid, so the capillary force is increased and therefore the wet compression strength is improved.

凝胶结构提高了粘结液相的粘度和表面张力，毛细力增大，生球抗压强度提高。

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A kind of method to evaluate and test the tension-compression fatigue strength of gray cast iron was introduced in this paper.

介绍了一种评价与测试灰铸铁铸件的拉压疲劳极限的方法。

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