ASTM C780-05

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Designation:C780–05
Standard Test Method for
Preconstruction and Construction Evaluation of Mortars for
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Plain and Reinforced Unit Masonry
This standard is issued under the fixed designation C780; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript 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.
INTRODUCTION
This test method provides a standard procedure for sampling and testing mortars for composition
and plastic and hardened properties, either before or during actual construction. The procedures
outlined in the Annexes are considered applicable for evaluating various combinations of portland
cement, lime, and masonry cement for mortars common to plain and reinforced unit masonry
construction.
The test procedures describe methods for the measurement of mortar composition and mortar
properties. No attempt is made to claim or substantiate specific correlations between the measured
properties and mortar performance in the masonry. However, data from these test methods can be
combined with other information to formulate judgments about the quality of the masonry.
Testing using these procedures is limited to the preconstruction evaluation of masonry mortars
withinthelaboratory,totheevaluationofmasonrymortarsattheconstructionsite,andinestablishing
the degree of quality control exercised during mortar production at the construction site.
1. Scope* priate safety and health practices and determine the applica-
bilityofregulatorylimitationspriortouse.Forspecifichazards
1.1 Thistestmethodcoversproceduresforthesamplingand
statements, see Section 8.
testing of mortars for composition and for their plastic and
hardened properties, either before or during their actual use in
2. Referenced Documents
construction.
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2.1 ASTM Standards:
1.2 Preconstruction Evaluation—This test method permits
C39/C39M Test Method for Compressive Strength of Cy-
comparisons of mortars made from different materials under
lindrical Concrete Specimens
simulated field conditions. It is also used to establish baseline
C109/C 109M Test Method for Compressive Strength of
values for comparative evaluation of field mortars.
Hydraulic Cement Mortars (Using 2-in. or 50-mm Cube
1.3 Construction Evaluation—Use of this method in the
Specimens)
field provides a means for quality assurance of field-mixed
C128 Test Method for Density, Relative Density (Specific
mortar. It includes methods for verifying the mortar mix
Gravity) and Absorption of Fine Aggregate
proportions, comparing test results for field mortars to precon-
C173/C173M Test Method for Air Content of Freshly
struction testing, and determining batch-to-batch uniformity of
Mixed Concrete by the Volumetric Method
the mortar.
C187 Test Method for Normal Consistency of Hydraulic
1.4 The test results obtained under this test method are not
Cement
required to meet the minimum compressive values in accor-
C231 Test Method for Air Content of Freshly Mixed
dance with the property specifications in Specification C270.
Concrete by the Pressure Method
1.5 This standard does not purport to address all of the
C270 Specification for Mortar for Unit Masonry
safety concerns, if any, associated with its use. It is the
C470/C470M Specification for Molds for Forming Con-
responsibility of the user of this standard to establish appro-
crete Test Cylinders Vertically
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ThistestmethodisunderthejurisdictionofASTMCommitteeC12onMortars
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for Unit Masonry and is the direct responsibility of Subcommittee C12.02 on For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Research and Methods of Test. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Current edition approved July 15, 2005. Published August 2005. Originally Standards volume information, refer to the standard’s Document Summary page on
approved in 1974. Last previous edition approved in 2002 as C780–02. the ASTM website.
*A Summary 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.
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C780–05
C496/C496M Test Method for Splitting Tensile Strength mixturesareprebatchedbyweight,additionalcharacteristicsof
of Cylindrical Concrete Specimens themortarsmaybecalculatedandusedinananalysisofmortar
C511 Specification for Mixing Rooms, Moist Cabinets, performance.
Moist Rooms, and Water Storage Tanks Used in the 4.2 During actual construction, evaluation of masonry mor-
Testing of Hydraulic Cements and Concretes
tars is possible by sam
...