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ASTM C1798-16

(Specification)

Standard Specification for Returned Fresh Concrete for Use in a New Batch of Ready-Mixed Concrete

Standard Specification for Returned Fresh Concrete for Use in a New Batch of Ready-Mixed Concrete

SCOPE
1.1 This specification covers returned fresh concrete for use in a new batch of ready-mixed concrete. Requirements for returned fresh concrete shall be either as hereinafter specified or as specified by the purchaser. In any case where the requirements of the purchaser differ from those in this specification, the purchaser’s requirements shall govern. This specification does not cover the placement, consolidation, curing, or protection of the concrete after delivery to the purchaser.  
1.2 This specification by itself shall not grant permission to the manufacturer to use returned fresh concrete in a new batch of concrete.
Note 1: The permission to use returned fresh concrete may be addressed in purchase documents, which may reference this specification.  
1.3 Returned fresh concrete in a quantity of less than 450 kg [1000 lb] or 0.2 m3 [0.25 yd3] shall not be subject to this specification.  
1.4 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 nonconformance with the standard.  
1.5 The text of this standard references notes and footnotes, which provide explanatory information. These notes and footnotes shall not be considered as requirements of the standard.  
1.6 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 use.2)

General Information

Status
Historical
Publication Date
14-Mar-2016
ICS
91.100.30 - Concrete and concrete products
Technical Committee
C09 - Concrete and Concrete Aggregates
Drafting Committee
C09.40 - Ready-Mixed Concrete
Current Stage
Ref Project

Relations

Replaced By
ASTM C1798/C1798M-16e1 - Standard Specification for Returned Fresh Concrete for Use in a New Batch of Ready-Mixed Concrete
Effective Date
15-Mar-2016

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ASTM C1798-16 - Standard Specification for Returned Fresh Concrete for Use in a New Batch of Ready-Mixed ConcreteASTM C1798-16 - Standard Specification for Returned Fresh Concrete for Use in a New Batch of Ready-Mixed Concrete
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ASTM C1798-16 - Standard Specification for Returned Fresh Concrete for Use in a New Batch of Ready-Mixed Concrete
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:C1798 −16
StandardSpecification for
Returned Fresh Concrete for Use in a New Batch of Ready-
1
Mixed Concrete
This standard is issued under the fixed designation C1798; 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 2. Referenced Documents
3
1.1 This specification covers returned fresh concrete for use 2.1 ASTM Standards:
in a new batch of ready-mixed concrete. Requirements for C94/C94M Specification for Ready-Mixed Concrete
returned fresh concrete shall be either as hereinafter specified C125 Terminology Relating to Concrete and Concrete Ag-
or as specified by the purchaser. In any case where the gregates
requirements of the purchaser differ from those in this C494/C494M Specification for Chemical Admixtures for
specification, the purchaser’s requirements shall govern. This Concrete
specification does not cover the placement, consolidation, C1064/C1064M Test Method for Temperature of Freshly
curing, or protection of the concrete after delivery to the Mixed Hydraulic-Cement Concrete
purchaser.
3. Terminology
1.2 This specification by itself shall not grant permission to
the manufacturer to use returned fresh concrete in a new batch 3.1 Definitions—The terms used in this specification are
of concrete. defined in Terminology C125.
NOTE 1—The permission to use returned fresh concrete may be
3.2 Definitions of Terms Specific to This Standard:
addressed in purchase documents, which may reference this specification.
3.2.1 admixture, hydration stabilizing, n—set-retarding
1.3 Returned fresh concrete in a quantity of less than 450 kg
admixture, conforming to Specification C494/C494M Type B
3 3
[1000 lb] or 0.2 m [0.25 yd ] shall not be subject to this
or D, that can predictably reduce the hydration rate of cement
specification.
for applications requiring the management of time of setting of
1.4 The values stated in either SI units or inch-pound units returned concrete, reducing the hydration rate of cement fines
are to be regarded separately as standard. The values stated in inwaterfromconcreteproduction,orforapplicationsrequiring
each system may not be exact equivalents; therefore, each
extended delivery time of ready-mixed concrete.
system shall be used independently of the other. Combining
3.2.2 concrete, returned fresh, n—fresh concrete not yet
values from the two systems may result in nonconformance
discharged from a ready-mixed concrete transportation unit
with the standard.
when it is returned to the manufacturer.
1.5 The text of this standard references notes and footnotes,
4. Ordering Information
which provide explanatory information. These notes and foot-
notes shall not be considered as requirements of the standard.
4.1 The new batch of concrete containing returned fresh
1.6 This standard does not purport to address all of the concrete shall meet all requirements of the purchaser.
safety concerns, if any, associated with its use. It is the NOTE 2—The requirements of this specification are in addition to those
of the purchaser and the specification of the new batch of concrete
responsibility of the user of this standard to establish appro-
containing returned fresh concrete.
priate safety and health practices and determine the applica-
NOTE 3—If using Specification C94/C94M for concrete potentially
bility of regulatory limitations prior to use. (Warning—Fresh
incorporating returned fresh concrete, it is recommended the purchaser
hydraulic cementitious mixtures are caustic and may cause
select Option A. In this option, the manufacturer has responsibility for
2
making necessary adjustments to mixture proportions to ensure the new
chemical burns to skin and tissue upon prolonged use. )
concrete batch containing returned fresh concrete will meet the require-
ments of the purchaser.
1
This specification is under the jurisdiction of ASTM Committee C09 on
Concrete and ConcreteAggregates and is the direct responsibility of Subcommittee
C09.40 on Ready-Mixed Concrete.
3
Current edition approved March 15, 2016. Published April 2016. DOI: 10.1520/ For referenced ASTM standards, visit the ASTM website, www.astm.org, or
C1798–16. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
2
See Section on Safety Precautions, Manual ofAggregate and Concrete Testing, Standards volume information, refer to the standard’s Document Summary page on
Annual Book of ASTM Standards, Vol 04.02. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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C1798−16
4.2 At the
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ABSTRACT
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.
SIGNIFICANCE AND USE
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SIGNIFICANCE AND USE
5.1 Tests performed at the same location across a span of years may be used to detect a reduction of infiltration rate of the pervious concrete, thereby identifying the need for remediation.  
5.2 The infiltration rate obtained by this method is valid only for the localized area of the pavement where the test is conducted. To determine the infiltration rate of the entire pervious pavement multiple locations must be tested and the results averaged.  
5.3 The field infiltration rate is typically established by the design engineer of record and is a function of the design precipitation event.  
5.4 This test method does not measure the influence on in-place infiltration rate due to sealing of voids near the bottom of the pervious concrete slab. Visual inspection of concrete cores is the best approach for determining sealing of voids near the bottom of the pervious concrete slab.
SCOPE
1.1 This test method covers the determination of the field water infiltration rate of in place pervious concrete.
Note 1: For permeable unit pavement systems, Test Method C1781/C1781M should be used. Test Method C1781/C1781M is functionally identical to this test method but includes added provisions for positioning and securing the test ring to a discontinuous surface. Both tests methods give comparable results  
1.2 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.  
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Standard Test Method for Air Content of Freshly Mixed Concrete by the Volumetric Method

SIGNIFICANCE AND USE
4.1 This test method covers the determination of the air content of freshly mixed concrete. It measures the air contained in the mortar fraction of the concrete, but is not affected by air that may be present inside porous aggregate particles.  
4.1.1 Therefore, this is the appropriate test to determine the air content of concretes containing lightweight aggregates, air-cooled slag, and highly porous or vesicular natural aggregates.  
4.2 This test method requires the addition of sufficient isopropyl alcohol, when the meter is initially being filled with water, so that after the first or subsequent rollings little or no foam collects in the neck of the top section of the meter. If more foam is present than that equivalent to 2 % air above the water level, the test is declared invalid and must be repeated using a larger quantity of alcohol. Addition of alcohol to dispel foam any time after the initial filling of the meter to the zero mark is not permitted.  
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SCOPE
1.1 This test method covers determination of the air content of freshly mixed concrete containing any type of aggregate, whether it be dense, cellular, or lightweight.  
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ASTM C138/C138M-23(Test Method)
Standard Test Method for Density (Unit Weight), Yield, and Air Content (Gravimetric) of Concrete

ABSTRACT
This test method covers determination of the density of freshly mixed concrete and gives formulas for calculating the unit weight, yield or relative yield, cement content, and air content of the concrete. Yield is defined as the volume of concrete produced from a mixture of known quantities of the component materials. The test method shall use the following apparatuses: balance or scale; tamping rod, which is a round straight steel rod having the tamping end rounded to a hemispherical tip; internal vibrator which may have rigid of flexible shafts, preferably powered by electric motors; measure, which is a cylindrical container made of steel or other suitable metal specified herein; strike-off plate; mallet; and scoop of a size large enough so each amount of concrete obtained from the sampling receptacle is representative and small enough so it is not spilled during placement in the measure.
SCOPE
1.1 This test method covers determination of the density (see Note 1) of freshly mixed concrete and gives formulas for calculating the yield, cement content, and air content of the concrete. Yield is defined as the volume of concrete produced from a mixture of known quantities of the component materials.  
1.2 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.
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1.3 The text of this test method refers to notes and footnotes that provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of this standard.  
1.4 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, health, and environmental 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.2)  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

  • Standard
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  • Standard
    6 pages
    English language
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