Which constraint limited Roman concrete construction with pozzolan?

💡 Explanation

Early large Roman marine structures suffered because inaccurate mixing caused inconsistent HYDRATION EXOTHERM that increased material stresses, therefore increased cracking occurred rather than a consistent monolithic structure, other options not being as significant.

• Which refinement did Islamic astronomers introduce to Ptolemy's epicycle model to enhance predictive accuracy?
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• Which outcome followed the selective breeding of teosinte into early maize?
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