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roman cement vs modern cement

CHARACTERISTICS Natural Cements are relatively fast-setting, compared withmodernPortland cements, but their strength develops more slowly.Typical set times range from just 2-3 minutes for European Natural (Roman) Cements, to 10-30 minutes for Quick-Setting Natural Cements, to 30-60 minutes for regular NaturalCement(the latter is usually achieved by incorporating set regulating additions).

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