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  • ASTM C688-08

ASTM C688-08

Standard Specification for Functional Additions for Use in Hydraulic Cements

ASTM International, 12/01/2008

Publisher: ASTM

File Format: PDF

$30.00$60.00


Published:01/12/2008

Pages:5

File Size:1 file , 99 KB

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1.1 This specification covers methods to investigate the effectiveness of a material to beneficially change the properties of hydraulic cements when the material is incorporated during manufacture of the cement.

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 The effect of additions in cement may markedly change properties other than those they are intended to modify. This specification is designed to test for such changes. Table 1 sets forth values for those properties of cement pastes and mortars that would permit a judgment of the changes effected by an addition. Likewise, Table 2 sets forth similar criteria for concrete. Certain additions may be found effective for more than one purpose as indicated in 3.1.4 and 3.1.5.

TABLE 1 Criteria for Evaluating Neat Cement and Mortar Containing Functional Cement Additions

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Tests Type of Addition
Water Reducing Retarding Accelerating Water-Reducing
and Retarding		 Water-Reducing and
Accelerating		 Set-Control
Normal consistency, deviation from control,
percentage pointsA		 −1.0 min +1.0 max +1.0 max −1.0 min −1.0 mm ±1.0 max
Standard consistency (flow) deviation from
control, percentage pointsA		 −4.0 min +2.0 max +2.0 max −4.0 min −4.0 min ±2.0 max
Setting time, (Gillmore) deviation from control,
h:min
Initial
At least ... 1:00 laterB 1:00 laterB ...
Not more than 1:00 earlier 3:30 later 1:30 earlier 3:30 later 1:30 earlier 1:00 earlier
nor nor nor nor
1:30 later 1:30 later 1:30 later 1:30 later
Setting time, Vicat InitialC
At least ... 0:50 laterB ... ... ...
Not more than 0:50 earlier 2:50 later 1:15 earlier 0:50 laterB 1:15 earlier 0:50 earlier
nor nor nor nor
1:15 later 1:15 later 2:50 later 1:15 later 1:15 later
Final
Not more than 1:00 earlier 3:30 later 1:00 earlier 3:30 later 1:00 earlier 1:00 earlier
nor nor nor nor
1:30 later 1:30 later 1:30 later 1:30 later