ASTM C1660-10(2018)
(Specification)Standard Specification for Thin-bed Mortar for Autoclaved Aerated Concrete (AAC) Masonry
Standard Specification for Thin-bed Mortar for Autoclaved Aerated Concrete (AAC) Masonry
ABSTRACT
This specification addresses the material and performance requirements of thin-bed mortar used in the construction of autoclaved aerated concrete (AAC) masonry. Materials used in the preparation of the thin-bed mortar shall conform to the requirements specified in referenced ASTM documents itemized herein. These materials include masonry cement, fine aggregates, Portland cement, hydrated lime, blended hydraulic cement, hydraulic cement, mortar cement, rapid hardening hydraulic cement, and adhesives. Properly sampled test specimens shall adhere to the minimum splitting tensile strength requirements specified for its class.
SCOPE
1.1 This specification applies to thin-bed mortar for autoclaved aerated concrete (AAC) masonry.
1.2 The testing laboratory performing these test methods shall be evaluated in accordance with Practice C1093.
1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
1.4 This standard may involve hazardous materials, operations, and equipment. 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.
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.
General Information
- Status
- Published
- Publication Date
- 31-Dec-2017
- Technical Committee
- C12 - Mortars and Grouts for Unit Masonry
- Drafting Committee
- C12.03 - Specifications for Mortars
Relations
- Effective Date
- 01-Jan-2018
- Effective Date
- 15-Dec-2023
- Effective Date
- 01-Dec-2023
- Effective Date
- 15-Dec-2018
- Effective Date
- 01-Dec-2018
- Effective Date
- 01-Jun-2018
- Effective Date
- 01-Jun-2018
- Effective Date
- 15-Dec-2017
- Effective Date
- 01-Dec-2017
- Effective Date
- 01-Jun-2017
- Effective Date
- 01-May-2017
- Effective Date
- 15-Dec-2015
- Effective Date
- 15-Dec-2015
- Effective Date
- 01-Sep-2015
- Effective Date
- 01-Jun-2015
Overview
ASTM C1660-10(2018): Standard Specification for Thin-bed Mortar for Autoclaved Aerated Concrete (AAC) Masonry provides the latest requirements for the materials and performance of thin-bed mortar used in AAC masonry construction. Developed by ASTM International, this standard supports consistency in the selection and application of thin-bed mortars, ensuring their compatibility with AAC units. The specification defines the scope, referenced materials, performance criteria, and testing methods, making it a vital reference for professionals in the masonry and construction industries focused on autoclaved aerated concrete systems.
Key Topics
- Scope of Application: This standard is specifically designed for thin-bed mortar intended for AAC masonry, ensuring mortars are correctly matched with AAC blocks and structural systems.
- Material Requirements: All constituent materials-including masonry cement, Portland cement, hydrated lime, aggregate, mortar cement, blended and hydraulic cements, adhesives, and other additives-must comply with applicable ASTM specifications.
- Performance and Testing: To ensure durability and structural integrity, the thin-bed mortar must meet minimum splitting tensile strength requirements appropriate to the class of AAC being installed. Testing must be performed by accredited laboratories following a standardized methodology.
- Safety and Best Practices: The standard highlights the need for users to observe all safety, health, and environmental regulations when employing thin-bed mortar products and during construction operations.
Applications
ASTM C1660 is essential for the following practical applications:
- Construction of AAC Masonry: The standard guides engineers, architects, and contractors in selecting and using thin-bed mortars that optimize the joint performance in autoclaved aerated concrete walls and partitions. Thin-bed mortars are specifically engineered to create strong, minimal thickness joints (typically 2-3 mm) between AAC units.
- Quality Control and Compliance: Manufacturers and testing laboratories use the requirements in ASTM C1660 to ensure their products meet the necessary performance benchmarks, particularly regarding tensile strength and durability.
- Project Specification: Project documents and procurement processes frequently reference this standard to enforce material quality and testing procedures, reducing issues related to in-field performance or regulatory compliance.
- International Trade: Because this specification aligns with globally recognized principles and the World Trade Organization’s TBT Committee references, it supports cross-border procurement and comparability of AAC construction materials.
Related Standards
ASTM C1660 references several closely related ASTM standards to define material and testing requirements:
- ASTM C91: Specification for Masonry Cement
- ASTM C144: Specification for Aggregate for Masonry Mortar
- ASTM C150: Specification for Portland Cement
- ASTM C207: Specification for Hydrated Lime for Masonry Purposes
- ASTM C595: Specification for Blended Hydraulic Cements
- ASTM C1157: Performance Specification for Hydraulic Cement
- ASTM C1329: Specification for Mortar Cement
- ASTM C1384: Specification for Admixtures for Masonry Mortars
- ASTM C1386: Specification for Precast AAC Wall Construction Units (withdrawn)
- ASTM C1452: Specification for Reinforced AAC Elements (withdrawn)
- ASTM C1600/C1600M: Specification for Rapid Hardening Hydraulic Cement
- ASTM C1006: Test Method for Splitting Tensile Strength of Masonry Units
- ASTM C1093: Practice for Accreditation of Testing Agencies for Masonry
By adhering to ASTM C1660 and its referenced documents, construction professionals ensure that AAC masonry systems are built for lasting performance, safety, and compliance with both national and international standards. This improves project outcomes, structural reliability, and overall quality in AAC construction.
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Frequently Asked Questions
ASTM C1660-10(2018) is a technical specification published by ASTM International. Its full title is "Standard Specification for Thin-bed Mortar for Autoclaved Aerated Concrete (AAC) Masonry". This standard covers: ABSTRACT This specification addresses the material and performance requirements of thin-bed mortar used in the construction of autoclaved aerated concrete (AAC) masonry. Materials used in the preparation of the thin-bed mortar shall conform to the requirements specified in referenced ASTM documents itemized herein. These materials include masonry cement, fine aggregates, Portland cement, hydrated lime, blended hydraulic cement, hydraulic cement, mortar cement, rapid hardening hydraulic cement, and adhesives. Properly sampled test specimens shall adhere to the minimum splitting tensile strength requirements specified for its class. SCOPE 1.1 This specification applies to thin-bed mortar for autoclaved aerated concrete (AAC) masonry. 1.2 The testing laboratory performing these test methods shall be evaluated in accordance with Practice C1093. 1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.4 This standard may involve hazardous materials, operations, and equipment. 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. 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.
ABSTRACT This specification addresses the material and performance requirements of thin-bed mortar used in the construction of autoclaved aerated concrete (AAC) masonry. Materials used in the preparation of the thin-bed mortar shall conform to the requirements specified in referenced ASTM documents itemized herein. These materials include masonry cement, fine aggregates, Portland cement, hydrated lime, blended hydraulic cement, hydraulic cement, mortar cement, rapid hardening hydraulic cement, and adhesives. Properly sampled test specimens shall adhere to the minimum splitting tensile strength requirements specified for its class. SCOPE 1.1 This specification applies to thin-bed mortar for autoclaved aerated concrete (AAC) masonry. 1.2 The testing laboratory performing these test methods shall be evaluated in accordance with Practice C1093. 1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.4 This standard may involve hazardous materials, operations, and equipment. 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. 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.
ASTM C1660-10(2018) is classified under the following ICS (International Classification for Standards) categories: 91.100.10 - Cement. Gypsum. Lime. Mortar. The ICS classification helps identify the subject area and facilitates finding related standards.
ASTM C1660-10(2018) has the following relationships with other standards: It is inter standard links to ASTM C1660-10, ASTM C1232-23, ASTM C1384-23, ASTM C1600/C1600M-18, ASTM C1180-18, ASTM C1384-18, ASTM C1384-18e1, ASTM C144-17, ASTM C1384-17, ASTM C1232-17, ASTM C1600/C1600M-17, ASTM C1093-15a, ASTM C1093-15ae1, ASTM C1232-15a, ASTM C1093-15. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ASTM C1660-10(2018) is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
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.
Designation: C1660 −10 (Reapproved 2018)
Standard Specification for
Thin-bed Mortar for Autoclaved Aerated Concrete (AAC)
Masonry
This standard is issued under the fixed designation C1660; 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 C1006 Test Method for Splitting Tensile Strength of Ma-
sonry Units
1.1 This specification applies to thin-bed mortar for auto-
C1093 Practice for Accreditation of Testing Agencies for
claved aerated concrete (AAC) masonry.
Masonry
1.2 The testing laboratory performing these test methods
C1157 Performance Specification for Hydraulic Cement
shall be evaluated in accordance with Practice C1093.
C1180 Terminology of Mortar and Grout for Unit Masonry
1.3 The values stated in inch-pound units are to be regarded C1232 Terminology for Masonry
C1329 Specification for Mortar Cement
as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only C1384 Specification for Admixtures for Masonry Mortars
C1386 Specification for Precast Autoclaved Aerated Con-
and are not considered standard.
crete (AAC) Wall Construction Units (Withdrawn 2013)
1.4 This standard may involve hazardous materials,
C1452 Specification for Reinforced Autoclaved Aerated
operations, and equipment. This standard does not purport to
Concrete Elements (Withdrawn 2013)
address all of the safety concerns, if any, associated with its
C1555 Practice for Autoclaved Aerated Concrete Masonry
use. It is the responsibility of the user of this standard to
(Withdrawn 2009)
establish appropriate safety, health, and environmental prac-
C1600/C1600M Specification for Rapid Hardening Hydrau-
tices and determine the applicability of regulatory limitations
lic Cement
prior to use.
1.5 This international standard was developed in accor-
3. Terminology
dance with internationally recognized principles on standard-
3.1 Definitions—For definitions of terms used in this
ization established in the Decision on Principles for the
specification, refer to Terminologies C1180 and C1232, and
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical Specification C1386.
Barriers to Trade (TBT) Committee.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 thin-bed mortar, n—preblended mortar for use in
2. Referenced Documents
construction of AAC unit masonry whose joints are approxi-
1 1
2.1 ASTM Standards: mately ⁄16 to ⁄8-in. (2 to 3-mm) thick.
C91 Specification for Masonry Cement
4. Significance and Use
C144 Specification for Aggregate for Masonry Mortar
C150 Specification for Portland Cement
4.1 This specification applies to the thin-bed mortar mate-
C207 Specification for Hydrated Lime for Masonry Pur-
rials used in the construction of AAC masonry. It references
poses
directly the AAC materials standards under the jurisdiction of
C595 Specification for Blended Hydraulic Cements
ASTM Committees C15 and C27 including Specifications
C1386, C1452, and C1555.
5. Materials
This specification is under the jurisdiction of ASTM Committee C12 on
Mortars and Grouts for Unit Masonry and is the direct responsibility of Subcom-
5.1 Materials used in the preparation of thin-bed mortar for
mittee C12.03 on Specifications for Mortars.
AAC masonry shall conform to the requirements specified.
Current edition approved Jan. 1, 2018. Published February 2018. Originally
approved in 2009. Last previous edition approved in 2010 as C1660 – 10. DOI:
5.1.1 Masonry cement shall conform to Specification C91.
10.1520/C1660-10R18.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standardsvolume information, refer to the standard’s Document Summary page on The last approved version of this historical standard is referenced on
the ASTM website. www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C1660 − 10 (2018)
5.1.2 Fine aggregates shall conform to Specification C144 in. (100 by 100 by 100-mm), 6 ⁄4-in. (66-mm). Clean cutting
with the exception of the gradation requirements, which shall dust from the cubes with dry air.
not apply. The maximum aggregate size shall be that passing a
6.1.1.3 Sample Preparation—Mix the mortar according to
#6 standard sieve.
instructions of the mortar manufacturer.
5.1.3 Portland cement shall conform to Specification C150.
(1) Orient the pairs so that the surface to be mortared is the
5.1.4 Hydrated lime shall conform to Specification C207.
manufactured face of the unit and not the cut face. Apply
Type N lime is permitted if shown by test or performance
mortar, in an amount recommended by the mortar
record not to be detrimental to soundness of mortar.
manufacturer,tothejointareaofthespecimentoproduceafull
5.1.5 Blended hydraulic cement shall conform to Specifica-
1 1
bedded joint, approximately
⁄16-in. (2-mm) to ⁄8-in. (3-mm)
tion C595.
thick. Place the other specimen pair on top of the mortar so that
5.1.6 Hydraulic cement shall conform to Specification
the manufactured surfaces of the pair are now both in contact
C1157.
withthemortar.Pressfirmlybyhandtoensureintimatecontact
5.1.7 Mortar ce
...
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