MAKING AND CURING CONCRETE TEST SPECIMENS
TXDOT DESIGNATION: TEX-447-A
Test Procedure for
MAKING AND CURING CONCRETE TEST
SPECIMENS
TxDOT Designation: Tex-447-A
Effective Date: December 2017
1.
SCOPE
1.1
Part I of this test method covers procedures for making and curing cylindrical concrete,
repair material, and grout specimens that can be consolidated by rodding, vibration, or
self-consolidation as described herein.
1.2
Part II of this test method covers procedures for making and curing prismatic concrete
specimens that can be consolidated by rodding or vibration as described herein.
1.3
Part III of this test method gives the standard specification for moist cabinets, moist
rooms, and water storage tanks used in the testing of hydraulic cement and concrete.
1.4
The values given in parentheses (if provided) are not standard and may not be exact
mathematical conversions. Use each system of units separately. Combining values from
the two systems may result in nonconformance with the standard.
PART I—COMPRESSIVE STRENGTH SPECIMENS (CYLINDERS)
2.
PROCEDURE
2.1
For normal field concrete and extended repair material specimens, refer to ASTM C31
for the molding procedure, as supplemented by the following.
2.1.1
Remove aggregate larger than 2 in. by hand or by wet sieve method.
2.2
For self-consolidating concrete, refer to ASTM C1758 for the filling procedure and
ASTM C31 for the finishing and curing procedure.
2.3
For field neat repair material specimens, refer to ASTM C192 for the molding procedure,
as supplemented by the following.
2.3.1
Use only 3 × 6-in. cylindrical molds for neat repair materials.
2.3.2
For materials that do not consolidate well with rodding or vibration, refer to
ASTM C192, Section 7.4.1, Note 16.
CONSTRUCTION DIVISION
1–2
EFFECTIVE DATE: DECEMBER 2017
MAKING AND CURING CONCRETE TEST SPECIMENS
TXDOT DESIGNATION: TEX-447-A
2.3.3
Cap each specimen with a tight fitting lid immediately after finishing.
2.4
For laboratory concrete and all repair material specimens, refer to ASTM C192 for the
molding and curing procedures.
2.5
For field and laboratory grout specimens, use the following molding procedure to cast
3 × 6-in. cylinders.
2.5.1
Fill the mold in one layer, and tap the side of the mold 3 times with a tamping rod to
release any trapped air.
2.5.2
Immediately after casting, strike off excess material with a straight edge trowel, and cap
with a tight fitting lid.
2.6
For all field specimens, refer to ASTM C31 for the curing procedure, as supplemented by
the following.
2.6.1
For curing at remote sites, the temperature shown in Section 10.1.3.1 is modified to read
60–80°F (16–27°C).
PART II—FLEXURAL STRENGTH SPECIMENS (BEAMS)
3.
PROCEDURE
3.1
For field specimens, refer to ASTM C31 for the test procedure, as supplemented by the
following.
3.1.1
Remove aggregate larger than 2 in. by hand instead of by wet sieving.
3.1.2
For curing at remote sites, the temperature shown in Section 10.1.3.2 is modified to read
60–80°F (16–27°C).
3.2
For laboratory specimens, refer to ASTM C192 for the test procedure.
PART III—STANDARD SPECIFICATION FOR MOIST CABINETS, MOIST
ROOMS, AND WATER STORAGE TANKS USED IN THE TESTING OF
HYDRAULIC CEMENT AND CONCRETE
4.
PROCEDURE
4.1
Refer to ASTM C511 for the standard specification.
5.
ARCHIVED VERSIONS
5.1
Archived versions are available.
CONSTRUCTION DIVISION
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EFFECTIVE DATE: DECEMBER 2017