AASHTO T 219

Abstract

This test procedure is intended to serve as a reasonably accurate, fairly rapid means of determining the chemical limits of Type I hydrated lime and the particle size requirements of Types I and II hydrated lime on a routine basis. <br><strong>Note 1</strong>&#8212;The chemical limits of Type II lime shall be determined in accordance with ASTM C 25. <br>The entire procedure, as well as the calculations which it involves, is based on certain hypothetical assumptions. Lime products by their very nature contain many ingredients other than those mentioned or considered in the test procedure. For our purposes, only the principal constituents usually present are considered. This aids greatly in the simplification of the test procedure to the obvious loss of some degree of accuracy. All test values to be reported shall be rounded off to the first decimal place. <em>Example</em>: percent Ca(OH)₂ = 95.5 percent (rather than the 95.53 percent shown on the sample calculation sheets). The inherent accuracy obtainable through the use of this procedure is felt to be adequate for the purpose intended. The limitations of this test procedure, along with the object and intent of this same procedure, should be fully realized so that it may be evaluated as merely one approach to the problem of routine quality control on a quality basis. <br>The following applies to all specified limits in this standard: For the purposes of determining conformance with these specifications, an observed value or a calculated value shall be rounded off "to the nearest unit" in the last right-hand place of figures used in expressing the limiting value, in accordance with E 29, Using Significant Digits in Test Data to Determine Conformance with Specifications. <br>The values stated in SI units are to be regarded as the standard. <br>Refer to R 16 for regulatory information for chemicals.