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What is the ratio of a 4000psi concrete mix

What is the concrete mixing ratio in m25 concrete? The mixes of grades M5 M10, M15, M20 and M25 correspond approximately to the mix proportions (1:4:8), (1:3:6), (1:2:4), (1:1.5:3) and (1:1:2) respectively. What is the concrete mixing ratio in m30 concret...

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