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ASTM C90-05a

(Specification)

Standard Specification for Loadbearing Concrete Masonry Units

Standard Specification for Loadbearing Concrete Masonry Units

SCOPE
1.1 This specification covers hollow and solid (see 5.3 and 5.4) concrete masonry units made from hydraulic cement, water, and mineral aggregates with or without the inclusion of other materials. There are three classes of concrete masonry units: (1) normal weight, (2) medium weight, and (3) lightweight. These units are suitable for both loadbearing and nonloadbearing applications.
1.2 Concrete masonry units covered by this specification are made from lightweight or normal weight aggregates, or both.
1.3 The text of this standard references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard.
1.4 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.
Note 1—When particular features are desired such as surface textures for appearance or bond, finish, color, or particular properties such as weight classification, higher compressive strength, fire resistance, thermal performance or acoustical performance, these features should be specified separately by the purchaser. Local suppliers should be consulted as to the availability of units having the desired features.

General Information

Status
Historical
Publication Date
14-May-2005
ICS
91.100.30 - Concrete and concrete products
Technical Committee
C15 - Manufactured Masonry Units
Drafting Committee
C15.03 - Concrete Masonry Units and Related Units
Current Stage
Ref Project

Relations

Replaces
ASTM C90-05 - Standard Specification for Loadbearing Concrete Masonry Units
Effective Date
15-May-2005
Replaced By
ASTM C90-06 - Standard Specification for Loadbearing Concrete Masonry Units
Effective Date
01-Feb-2006
Referred By
ASTM C1780-23a - Standard Practice for Installation Methods for Cement-based Adhered Masonry Veneer
Effective Date
15-May-2005
Referred By
ASTM C129-22 - Standard Specification for Nonloadbearing Concrete Masonry Units
Effective Date
15-May-2005
Referred By
ASTM C744-21 - Standard Specification for Prefaced Concrete and Calcium Silicate Masonry Units
Effective Date
15-May-2005
Referred By
ASTM C1232-21a - Standard Terminology for Masonry
Effective Date
15-May-2005
Referred By
ASTM C140/C140M-23 - Standard Test Methods for Sampling and Testing Concrete Masonry Units and Related Units
Effective Date
15-May-2005
Referred By
ASTM C946-23 - Standard Practice for Construction of Dry-Stacked, Surface-Bonded Walls
Effective Date
15-May-2005
Referred By
ASTM E2266-22 - Standard Guide for Design and Construction of Low-Rise Frame Building Wall Systems to Resist Water Intrusion
Effective Date
15-May-2005
Referred By
ASTM F2956-22 - Standard Test Methods for Anchor Systems Used for Detention Hollow Metal Systems
Effective Date
15-May-2005
Referred By
ASTM C1283-15(2021) - Standard Practice for Installing Clay Flue Lining
Effective Date
15-May-2005
Referred By
ASTM D7147-21 - Standard Specification for Testing and Establishing Allowable Loads of Joist Hangers
Effective Date
15-May-2005
Referred By
ASTM C1492-22 - Standard Specification for Concrete Roof Tile
Effective Date
15-May-2005

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ASTM C90-05a - Standard Specification for Loadbearing Concrete Masonry UnitsASTM C90-05a - Standard Specification for Loadbearing Concrete Masonry Units
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ASTM C90-05a - Standard Specification for Loadbearing Concrete Masonry Units
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Standards Content (Sample)

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: C 90 – 05a
Standard Specification for
1
Loadbearing Concrete Masonry Units
ThisstandardisissuedunderthefixeddesignationC 90;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscript
epsilon (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope* C 426 Test Method for Linear Drying Shrinkage of Con-
crete Masonry Units
1.1 This specification covers hollow and solid (see 5.3 and
C 595 Specification for Blended Hydraulic Cements
5.4) concrete masonry units made from hydraulic cement,
C 618 Specification for Coal Fly Ash and Raw or Calcined
water, and mineral aggregates with or without the inclusion of
Natural Pozzolan for Use as a Mineral Admixture in
other materials. There are three classes of concrete masonry
Concrete
units: (1) normal weight, (2) medium weight, and (3) light-
C 989 Specification for Ground Granulated Blast-Furnace
weight. These units are suitable for both loadbearing and
Slag for Use in Concrete and Mortars
nonloadbearing applications.
C 1157 Performance Specification for Hydraulic Cement
1.2 Concretemasonryunitscoveredbythisspecificationare
C 1209 Terminology of Concrete Masonry Units and Re-
made from lightweight or normal weight aggregates, or both.
lated Units
1.3 The text of this standard references notes and footnotes
C 1232 Terminology of Masonry
which provide explanatory material. These notes and footnotes
C 1314 Test Method for Compressive Strength of Masonry
(excluding those in tables and figures) shall not be considered
Prisms
as requirements of the standard.
E 519 Test Method for Diagonal Tension (Shear) in Ma-
1.4 The values stated in inch-pound units are to be regarded
sonry Assemblages
as the standard. The values given in parentheses are for
E72 Methods for Conducting Strength Tests of Panels for
information only.
Building Construction
NOTE 1—When particular features are desired such as surface textures
for appearance or bond, finish, color, or particular properties such as
3. Terminology
weight classification, higher compressive strength, fire resistance, thermal
3.1 Terminology defined in Terminology C 1209 and Ter-
performance or acoustical performance, these features should be specified
minology C 1232 shall apply for this specification.
separately by the purchaser. Local suppliers should be consulted as to the
availability of units having the desired features.
4. Materials
2. Referenced Documents
4.1 Cementitious Materials—Materials shall conform to the
2
2.1 ASTM Standards: following applicable specifications:
4.1.1 Portland Cement—Specification C 150.
C33 Specification for Concrete Aggregates
C 140 Test Methods for Sampling and Testing Concrete 4.1.2 Modified Portland Cement—Portland cement con-
forming to Specification C 150, modified as follows:
Masonry Units and Related Units
C 150 Specification for Portland Cement (1) Limestone—If calcium carbonate is added to the
cement, the CaCO content shall not be less than 85 %.
C 331 Specification for Lightweight Aggregates for Con-
3
crete Masonry Units (2) Limitation on Insoluble Residue—1.5 %.
(3) Limitation on Air Content of Mortar—Volume percent,
22 % max.
(4) Limitation on Loss on Ignition—7 %.
1
This specification is under the jurisdiction of ASTM Committee C15 on
4.1.3 Blended Hydraulic Cements—Specification C 595.
Manufactured Masonry Units and is the direct responsibility of Subcommittee
4.1.4 Hydraulic Cement—Specification C 1157.
C15.03 on Concrete Masonry Units and Related Units.
4.1.5 Pozzolans—Specification C 618.
Current edition approved May 15, 2005. Published June 2005. Originally
approved in 1931. Last previous edition approved in 2005as C 90–05.
4.1.6 Blast Furnace Slag Cement—Specification C 989.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
4.2 Aggregates—Aggregates shall conform to the following
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
specifications, except that grading requirements shall not
Standards volume information, refer to the standard’s Document Summary page on
necessarily apply:
the ASTM website.
*ASummary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
C90–05a
applicable provisions of Test Methods E72, C 1314, E 519, or other
4.2.1 Normal Weight Aggregates—SpecificationC33.
applicable tests and the appropriate design criteria developed is in
4.2.2 Lightweight Aggregates—Specification C 331.
accordance with applicable building codes.
4.3 Other Constituen
...

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4.1 This test method is intended to evaluate the drying shrinkage characteristics of a given unit. The results of this laboratory method are considered in determining concrete masonry crack control provisions.  
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4.1 This practice provides for using an unbonded capping system in testing hardened concrete cylinders made in accordance with Practices C31/C31M or C192/C192M, or cores obtained in accordance with Test Method C42/C42M in lieu of the capping systems described in Practice C617/C617M.  
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1.4 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 are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined. Combining values from the two systems may result in non-conformance with the standard.  
1.5 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—Concrete specimens tested with unbonded caps rupture more violently than comparable specimens tested with bonded caps. The safety precautions given in the Manual of Aggregate and Concrete Testing are recommended.2)  
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ASTM C873/C873M-23(Test Method)
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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
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  
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.
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 mm to 300 mm [5 in. to 12 in.].  
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