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// CODE SNIPPET

Section 21.403 — Materials

Los Angeles Existing Building Code > Standards Referenced Standards > 21-4 Hollow and Solid Load-Bearing Concrete Masonry Units > 21.403 — Materials
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21.403.1 Cementitious Materials

Materials shall conform to the following applicable standards:

  1. Portland Cement—ASTM C 150 modified as follows:

    Limitation on insoluble residue—1.5 percent maximum.

    Limitation on air content of mortar, Volume percent—22 percent maximum.

    Limitation on loss on ignition—7 percent maximum.

    Limestone with a minimum 85 percent calcium carbonate (CaCO3) content may be added to the cement, provided the requirements of ASTM C 150 as modified above are met.

  2. Blended Cements—ASTM C 595.
  3. Hydrated Lime, Type S—UBC Standard 21-13.

21.403.2 Other Constituents and Aggregates

Air-entraining agents, coloring pigments, integral water repellents, finely ground silica, aggregates, and other constituents, shall be previously established as suitable for use in concrete or shall be shown by test or experience to not be detrimental to the durability of the concrete.

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