The effects of the strength of natural and recycled aggregate,practical water-to-cement ratio and nominal water-to-cement ratio on the compressive strength of concrete are studied in a quantitative manner.Experimental results show that the compressive strength of concrete is closely related not only to the water-to-cement ratio,but also to the crushing value of aggregate.Through further analysis,it is found that a good linear correlation between the compressive strength of concrete and the cement-to-water ratio and the crushing value of aggregate exists and a unified Bolomey's formula is established for concrete made with both natural and recycled aggregate.
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