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ASTM-C1679:2008 Edition

ASTM-C1679:2008 Edition

$44.96

C1679-08 Standard Practice for Measuring Hydration Kinetics of Hydraulic Cementitious Mixtures Using Isothermal Calorimetry

Published By Publication Date Number of Pages
ASTM 2008 14
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1.1 This practice describes the apparatus and procedure for measuring relative differences in hydration kinetics of hydraulic cementitious mixtures, either in paste or mortar (See Note 1), including those containing admixtures, various supplementary cementitious materials (SCM), and other fine materials by measuring the thermal power using an isothermal calorimeter.

Note 1Paste specimens are often preferred for mechanistic research when details of individual reaction peaks are important or for particular calorimetry configurations. Mortar specimens may give results that have better correlation with concrete setting and early strength development and are often preferred to evaluate different mixture proportions for concrete. Both paste and mortar studies have been found to be effective in evaluating concrete field problems due to incompatibility of materials used in concrete mixtures.

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. ( Warning Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to skin and tissue upon prolonged exposure. )

PDF Catalog

PDF Pages PDF Title
1 Scope
Referenced Documents
Terminology
2 FIG. 1
3 Summary of Practice
Significance and Use
Apparatus
FIG. 2
4 Materials
Temperature and Humidity
Test Specimens
5 Composition of Paste or Mortar Mixtures
Preparation of Apparatus
Procedure
6 Calculation of Results
Evaluation of Test Results
Report
FIG. 3
7 Keywords
X1. DEFINITIONS OF TERMS USED IN APPENDIX
X1.1 delay time, n
X1.2 delayed addition of admixture, n
X1.3 heat of hydration, n
X1.4 tail end addition of admixture, n
X1.5 upfront addition of admixture, n
FIG. 4
8 X2. TYPICAL USES, EXPERIMENTAL DESIGNS AND EVALUATION
X2.1 General
X3. SULFATE BALANCE
X3.1
X3.2
X3.3
9 X4. MIXING METHODS
X4.1
X4.2
X4.3
X4.4 Preparation of Paste Using a Hand-Held Kitchen Mixer or Similar Mixer
X4.5 Preparation of Paste Using a High Speed Blender
X4.6 Preparation of Mortar (modified Practice C 305 pro-cedure)
FIG. X3.1
10 X4.7 Obtaining Sample of Mortar from Concrete
X5. GRAPHICAL EVALUATION OF RESULTS
X5.1
FIG. X5.1
11 X6. EXAMPLES
X6.1 Study of Effect of Admixture Dosage and SCM Content on Thermal Indicator of Setting Time at Constant Temperature
X6.2 Study of Effect of Curing Temperature on Hydration Kinetics
X6.3 Study of Effect of Admixture Dosage and Sequence of Addition on Setting Time
TABLE X6.1
12 FIG. X6.1
FIG. X6.2
TABLE X6.2
13 TABLE X6.3
FIG. X6.3
FIG. X6.4

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