Preparing the right mix for solid ...
With a few workers and a decent cement mixer, a surprisingly large amount of concrete can be mixed quickly. Classifying concrete Strength — Premixed concrete will carry a classifiion which refers to the strength of the cured concrete (see Table 1). Normal class concrete ('N') is available in grades of N20, N25, N32, N40 and N50 (the number refers to the strength in megapascals ...
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