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The main compounds in ordinary portland cement (OPC) are tricalcium silicates, dicalcium silicates, tricalcium aluminate, and tetracalcium aluminoferrite. These compounds hydrate and form calcium silicate hydrates and calcium hydroxide, contributing to the strength of concrete. The strength of concrete increases rapidly initially as hydration occurs, then more slowly over time, typically reaching about 90% of ultimate strength at 28 days. Lower water-cement ratios and smaller aggregate sizes produce higher

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syed

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