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Colombian NTC 321: Portland Cement Specs by ScribdTranslations is a document available to read on EtoBox.

This document presents the Colombian Technical Standard 321, which establishes the chemical requirements that Portland cement must meet in Colombia. It defines six types of Portland cement and specifies the maximum and minimum allowed limits for each of the oxides and chemical compounds that compose it. It also describes the procedures for sampling, testing, and acceptance or rejection of the cement based on whether it meets the established requirements.

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