tailieunhanh - Designation: C 305 – 99 - Mechanical Mixing of Hydraulic Cement Pastes and Mortars of Plastic Consistency1

This standard is issued under the fixed designation C 305; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon (e) indicates an editorial change since the last revision or reapproval. | Designation C 305 99 AMERICAN SOCIETY FOR TESTING AND MATERIALS 100 Barr Harbor Dr. West Conshohocken PA 19428 Reprinted from the Annual Book of ASTM Standards. Copyright ASTM American Association State Highway and Transportation Officials Standard AASHTO No. T162 Standard Practice for Mechanical Mixing of Hydraulic Cement Pastes and Mortars of Plastic Consistency1 This standard is issued under the fixed d ii r atic n c 305 the number immediately following the designation indicates the year of original adoption or in the case of revision the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. 1. Scope This practice covers the mechanical mixing of hydraulic cement pastes and mortars of plastic consistency. This standard does not purport to address all of the safety concerns if any associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 2. Referenced Documents ASTM Standards C 778 Specification for Standard Sand2 3. Significance and Use This practice is intended for use in the mechanical mixing of pastes and mortars for the testing of hydraulic cements. 4. Apparatus Mixer The mixer shall be an che ttrl aly driven mc-chanical mixer of the epicyclic type ihich imparts both a planetary and a revolving motion to the mixer paddle. The mixer shall have a minimum of tio speeds controlled by defimte mechanical means. Rheossal adjusimcnl of speed wiil not be acceptable. The f rsL or slow speed shad revolve the paddle at a rate of 140 5 r min with a planetary motion of approximately 62 r min. The second speed shall revolve the paddle at a rate of 285 10 r min iith a planetary motion of approximately 125 r min. The electric motor shall be at least 124 W b .hp .3 The mixer shall be .