ASTM C305-13
(Practice)Standard Practice for Mechanical Mixing of Hydraulic Cement Pastes and Mortars of Plastic Consistency
Standard Practice for Mechanical Mixing of Hydraulic Cement Pastes and Mortars of Plastic Consistency
SIGNIFICANCE AND USE
3.1 This practice is intended for use in the mechanical mixing of pastes and mortars for the testing of hydraulic cements.
SCOPE
1.1 This practice covers the mechanical mixing of hydraulic cement pastes and mortars of plastic consistency.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this 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 establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: C305 − 13 AmericanAssociation State
Highway and Transportation Officials Standard
AASHTO No.: T162
Standard Practice for
Mechanical Mixing of Hydraulic Cement Pastes and Mortars
1
of Plastic Consistency
This standard is issued under the fixed designation C305; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope* a planetary motion of approximately 62 r/min. The second
speed shall revolve the paddle at a rate of 285 6 10 r/min, with
1.1 This practice covers the mechanical mixing of hydraulic
a planetary motion of approximately 125 r/min. The electric
cement pastes and mortars of plastic consistency.
1
motor shall be at least 124 W ( ⁄6 hp). The mixer shall be
1.2 The values stated in SI units are to be regarded as
equipped with either an adjustment screw which is an integral
standard. No other units of measurement are included in this
part of the mixer or a clearance adjustment bracket such as the
standard.
one shown in Fig. 1 (Note 1) to provide clearance between the
1.3 This standard does not purport to address all of the
lower end of the paddle and the bottom of the bowl that is not
safety concerns, if any, associated with its use. It is the
greater than 2.5 mm but not less than 0.8 mm (Note 2) when
responsibility of the user of this standard to establish appro-
the bowl is in the mixing position.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
NOTE 1—When the bracket is in the proper position beneath the motor
housing, the lugs are to the front and facing upward and the heads of the
2. Referenced Documents 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
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2.1 ASTM Standards:
fastened at the front housing connection by inserting replacement screws
C511 Specification for Mixing Rooms, Moist Cabinets,
onanappropriatesizeupwardthroughtheopeningineachlugandintothe
Moist Rooms, and Water Storage Tanks Used in 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
Testing of Hydraulic Cements and Concretes
from coming in contact with the adjustment screws.
C778 Specification for Sand
NOTE 2—This is the approximate diameter of a grain of 20 to 30 sand
as described in Specification C778.
3. Significance and Use
3.1 This practice is intended for use in the mechanical 4.2 Paddle—The paddle shall be readily removable, made
mixing of pastes and mortars for the testing of hydraulic
of stainless steel, and shall conform to the basic design shown
cements.
in Fig. 2.The dimensions of the paddle shall be such that when
in the mixing position the paddle outline conforms to the
4. Apparatus
contour of the bowl used with the mixer, and the clearance
4.1 Mixer—The mixer shall be an electrically driven me- betweencorrespondingpointsontheedgeofthepaddleandthe
chanical mixer of the epicyclic type, which imparts both a
side of the bowl in the position of closest approach shall be
planetary and a revolving motion to the mixer paddle. The
approximately 4.0 mm but not less than 0.8 mm.
mixer shall have a minimum of two controlled speeds. (Rheo-
4.3 Mixing Bowl—The removable mixing bowl shall have a
stat adjustment of speed is not acceptable.) The first, or slow
nominal capacity of 4.73 L, shall be of the general shape and
speed shall revolve the paddle at a rate of 140 6 5 r/min, with
comply with the limiting dimensions shown in Fig. 3, and shall
be made of stainless steel. The bowl shall be so equipped that
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This practice is under the jurisdiction ofASTM Committee C01 on Cement and
it will be positively held in the mixing apparatus in a fixed
is the direct responsibility of Subcommittee C01.22 on Workability.
position during the mixing procedure. Provide an enclosure
CurrenteditionapprovedJune1,2013.PublishedJuly2013.Originallyapproved
around the mixing bowl or a lid to minimize evaporation of
in1953.Lastpreviouseditionapprovedin2012asC305-12.DOI:10.1520/C0305-
13.
waterduringperiodsofrestofthemixture.Theenclosureorlid
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
shall be made of non-absorbing material that is resistant to
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
deterioration from the alkaline environment of cement pastes
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. and mortars.
*A Summary of Changes section appears at the end of this standard
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This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: C305 − 12 C305 − 13 American Association State
Highway and Transportation Officials Standard
AASHTO No.: T162
Standard Practice for
Mechanical Mixing of Hydraulic Cement Pastes and Mortars
1
of Plastic Consistency
This standard is issued under the fixed designation C305; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope*
1.1 This practice covers the mechanical mixing of hydraulic cement pastes and mortars of plastic consistency.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this 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 establish appropriate safety and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
C511 Specification for Mixing Rooms, Moist Cabinets, Moist Rooms, and Water Storage Tanks Used in the Testing of Hydraulic
Cements and Concretes
C778 Specification for Sand
3. Significance and Use
3.1 This practice is intended for use in the mechanical mixing of pastes and mortars for the testing of hydraulic cements.
4. Apparatus
4.1 Mixer—The mixer shall be an electrically driven mechanical mixer of the epicyclic 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. controlled speeds. (Rheostat adjustment of speed willis not be acceptable.) The first, or slow speed shall revolve the paddle
at a rate of 140 6 5 r/min, with a planetary motion of approximately 62 r/min. The second speed shall revolve the paddle at a rate
1
of 285 6 10 r/min, with a planetary motion of approximately 125 r/min. The electric motor shall be at least 124 W ( ⁄6 hp). The
mixer shall be equipped with either an adjustment screw which is an integral part of the mixer or a clearance adjustment bracket
such as the one shown in Fig. 1 (Note 1) to provide clearance between the lower end of the paddle and the bottom of the bowl
that is not greater than 2.5 mm but not less than 0.8 mm (Note 2) when the bowl is in the mixing position.
NOTE 1—When the bracket is in the proper position beneath the motor housing, the lugs are to the front and facing 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 on an appropriate size upward through the opening in 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 2—This is the approximate diameter of a grain of 20-30 20 to 30 sand as described in Specification C778.
4.2 Paddle—The paddle shall be readily removable, made of stainless steel, and shall conform to the basic design shown in Fig.
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 mixer, 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.
1
This practice is under the jurisdiction of ASTM Committee C01 on Cement and is the direct responsibility of Subcommittee C01.22 on Workability.
Current edition approved July 1, 2012June 1, 2013. Published July 2012July 2013. Originally approved in 1953. Last previous edition approved in 20112012 as C305 -
11.12. DOI: 10.1520/C0305-12.10.1520/C0305-13.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
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C305 −
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