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Standard Test Method for Compressive Strength of Concrete Cylinders Cast in Place in Cylindrical Molds
Automaticky přeložený název:
Standardní metoda zkoušky pevnosti betonu válců Cast in place ve válcovitých formách
NORMA vydána dne 1.12.2015
Označení normy: ASTM C873/C873M-15
Datum vydání normy: 1.12.2015
Kód zboží: NS-631921
Počet stran: 4
Přibližná hmotnost: 12 g (0.03 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
This test method covers the determination of strength of cylindrical concrete specimens that have been molded in place using special molds attached to formwork. A concrete cylinder mold assembly consisting of a mold and a tubular support member is fastened within the concrete formwork prior to placement of the concrete. The elevation of the mold upper edge is adjusted to correspond to the plane of the finished slab surface. The mold support prevents direct contact of the slab concrete with the outside of the mold and permits its easy removal from the hardened concrete. Strength of cast-in-place cylinders may be used for various purposes, such as estimating the load-bearing capacity of slabs, determining the time of form and shore removal, and determining the effectiveness of curing and protection. Consolidation of concrete in the mold may be varied to simulate the conditions of placement. Internal vibration of concrete in the mold is prohibited except under special circumstances.
Keywords:
compressive strength, concrete, cylinder molds , in-place strength,, ICS Number Code 91.100.30 (Concrete and concrete products)
Significance and Use | ||||||||||||
4.1 Cast-in-place cylinder strength relates to the strength of concrete in the structure due to the similarity of curing conditions because the cylinder is cured within the slab. However, due to differences in moisture condition, degree of consolidation, specimen size, and length-diameter ratio, there is not a unique relationship between the strength of cast-in-place cylinders and cores of the same age. When cores can be drilled undamaged and tested in the same moisture condition as the cast-in-place cylinders, the strength of the cylinders can be expected to be on average 10 % higher than the cores at ages up to 91 days for specimens of the same size and length-diameter ratio.4.2 Strength of cast-in-place cylinders may be used for various purposes, such as estimating the load-bearing capacity of slabs, determining the time of form and shore removal, and determining the effectiveness of curing and protection. |
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1. Scope | ||||||||||||
1.1 This test method covers the determination of strength of cylindrical concrete specimens that have been molded in place using special molds attached to formwork. This test method is limited to use in slabs where the depth of concrete is from 125 to 300 mm [5 to 12 in.]. 1.2 Units—The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with 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
consult and establish appropriate safety and health practices and
determine the applicability of regulatory limitations prior to use.
Practice for Use of Unbonded Caps in
Determination of Compressive Strength of Hardened Concrete
Cylinders Specification for Molds for Forming
Concrete Test Cylinders Vertically Test Method for Obtaining and Testing
Drilled Cores and Sawed Beams of Concrete Test Method for Compressive Strength of
Cylindrical Concrete Specimens Practice for Preparing Precision and Bias
Statements for Test Methods for Construction Materials Practice for Capping Cylindrical Concrete
Specimens |
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