AASHTO T 162-2016 Standard Method of Test for Mechanical Mixing of Hydraulic Cement Pastes and Mortars of Plastic Consistency.pdf

1、Standard Method of Test for Mechanical Mixing of Hydraulic Cement Pastes and Mortars of Plastic Consistency AASHTO Designation: T 162-16 Release: Group 1 (April 2016) ASTM Designation: C305-14 American Association of State Highway and Transportation Officials 444 North Capitol Street N.W., Suite 249

2、 Washington, D.C. 20001 TS-3a T 162-1 AASHTO Standard Method of Test for Mechanical Mixing of Hydraulic Cement Pastes and Mortars of Plastic Consistency AASHTO Designation: T 162-16 Release: Group 1 (April 2016) ASTM Designation: C305-14 1. SCOPE 1.1. This method covers the mechanical mixing of hydr

3、aulic cement pastes and mortars of plastic consistency. 1.2. The values stated in SI units are to be regarded as the standard. 1.3. 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 establis

4、h appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 2. REFERENCED DOCUMENTS 2.1. AASHTO Standard: M 201, Mixing Rooms, Moist Cabinets, Moist Rooms, and Water Storage Tanks Used in the Testing of Hydraulic Cements and Concretes 2.2. ASTM S

5、tandard: C778, Standard Specification for Standard Sand 3. SIGNIFICANCE AND USE 3.1. This method is intended for use in the mechanical mixing of pastes and mortars for the testing of hydraulic cements. 4. APPARATUS 4.1. MixerThe mixer shall be an electrically driven mechanical mixer of the epicyclic

6、 type, which imparts both a planetary and a revolving motion to the mixer paddle. The mixer shall have a minimum of two speeds, controlled by definite mechanical means. (Rheostat adjustment of speed will not be acceptable.) The first, or slow, speed shall revolve the paddle at a rate of 140 5 r/min,

7、 with a planetary motion of approximately 62 r/min. The second speed shall revolve the paddle at a rate of 285 10 r/min, with a planetary motion of approximately 125 r/min. The electric motor shall be at least 124 W (1/6hp). The mixer shall be equipped with a screw that is an integral part of the mi

8、xer or a clearance adjustment bracket as shown in Figure 1 (see Note 1), which shall be used to maintain the clearance between the lower end of the paddle and the bottom of the bowl not 2016 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is

9、 a violation of applicable law.TS-3a T 162-2 AASHTO greater than 2.5 mm, but not less than 0.8 mm (see Note 2) when the bowl is in the mixing position. Figure 1Clearance Adjustment Bracket Note 1When the bracket is in the proper position beneath the motor housing, the lugs are to the front and facin

10、g upward, and the heads of the adjustment screws are to the rear and facing downward in the path of the sliding frame that holds the bowl. It is intended that the bracket be fastened at the front housing connection by inserting replacement screws of an appropriate size upward through the opening in

11、each lug and into the existing threaded holes in the bottom of the motor housing. The original stops for the sliding frame are to be filed down if they prevent the frame from coming in contact with the adjustment screws. Note 2This is the approximate diameter of a grain of 2030 sand as described in

12、ASTM C778. 4.2. PaddleThe paddle shall be readily removable, shall be made of stainless steel, and shall conform to the basic design shown in Figure 2. The dimensions of the paddle shall be such that when in the mixing position, the paddle outline conforms to the contour of the bowl used with the mi

13、xer, and the clearance between corresponding points on the edge of the paddle and the side of the bowl in the position of closest approach shall be approximately 4.0 mm, but not less than 0.8 mm. 103.077.812.7 12.710.322.238.014.312.7 Radius6-mm SI Thread,Tap through,2 holes40.5 40.592.011.05.58-mm

14、Dia, 2 holes6.4 Radius6-mm SI ThreadHex Nut, 2 Reqd(1 shown)3.2 Radius (Typ.)13.06.516.0Silver Solder,2 Bushings3Drill mixing; pastes; plastic consistency. 2016 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.