This paper analysed causes of concrete strength not enough.

分析了导致混凝土强度不足的原因。

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Refer to Architect's General Specification for concrete strength and mortar mix.

混凝土强度及灰浆混合比例须参照建筑师之基本规范。

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The proper evaluation of concrete strength is the principal part of the acceptance of concrete work.

混凝土强度的正确评定是混凝土分项工程质量验收与评定的主要组成部分。

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Another study, published back in 1995, showed that although the compressive strength of concrete was enhanced only slightly by the addition of polymer fibres, its impact resistance improved sevenfold.

ECONOMIST: Bunker-busting

And even though steel and concrete are still the most cost-effective materials, new combinations of these substances provide greater strength and fire retardance, says W. Gene Corley, senior vice president at Construction Technology Laboratories in Skokie, Ill.

FORBES: They Will Rise Again