Section 2. Commentary — As discussed in Section 1. Rather, this guide is intended to capture commonly encountered materials and questions and provide the user with assessment recommendations accordingly. The source of materials, particularly waste and by-product materials, should be well documented to avoid the inadvertent introduction of toxic or hazardous materials into a concrete masonry unit. When the source of a material is unknown, or when the presence of a toxic substance is reasonably suspected, the material should be evaluated using a TCLP test Toxicity Characteristic Leaching Procedure. The TCLP test analyzes the leachate for the presence of hazardous, corrosive, reactive, and similar toxic substances.
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The three weight classifications for concrete masonry units are normal weight, medium weight, and lightweight. The values stated in inch-pound units are to be regarded as the standard. NOTE 1—Concrete masonry units covered by this specification are made from lightweight or normal weight aggregates, or both.
NOTE 2—When particular features are desired, such as weight classification, high compressive strength, surface texture for appearance or bond, finish, color, fire resistance, insulation, acoustical properties, or other special features, such properties should be specified separately by the purchaser.
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Performance Guidelines for Concrete Masonry Units – Last Revised May 2, 2011