ASTM_C_946_-_10.pdf

Designation:C94610Standard Practice forConstruction of Dry-Stacked,Surface-Bonded Walls1This standard is issued under the fixed designation C946;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice covers material,workmanship,and con-struction procedures for applying surface bonded mortar toboth sides of dry stacked concrete masonry units.It does notinclude grout,reinforcing,anchorage,or control joints sincetheir use is essentially the same as conventional concretemasonry construction,unless specifically mentioned in thispractice.NOTE1Design and construction procedures for conventional concretemasonry construction are found in Building Code Requirements forMasonry Structures(TMS 402-08/ACI 530-08/ASCE 5-08)and Specifi-cation for Masonry Structures(TMS 602-08/ACI 530.1-08/ASCE 6-08).1.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2C55 Specification for Concrete Building BrickC90 Specification for Loadbearing Concrete Masonry UnitsC129 Specification for Nonloadbearing Concrete MasonryUnitsC270 Specification for Mortar for Unit MasonryC887 Specification for Packaged,Dry,Combined Materialsfor Surface Bonding Mortar2.2 Other Documents:TMS 402-08/ACI 530-08/ASCE 5-08 The Masonry Society,Building Code Requirements for Masonry Structures3TMS 602-08/ACI 530.1-08/ASCE 6-08 The Masonry Soci-ety,Specification for Masonry Structures3TEK 10-2A National Concrete Masonry Association,Con-trol Joints for Concrete Masonry Walls4Standard Practice for Bracing Masonry Walls Under Con-struction,Masonry Contractors Association of America53.Storage3.1 Deliver and store surface bonding mortar in originalcontainers off the ground to prevent contact with water.Protectfrom rain with suitable covering.3.2 Store concrete masonry units off the ground to preventcontamination by mud,dust,and materials likely to causestaining or other defects,and protect from rain.4.Materials and Manufacture4.1 Concrete masonry units shall be clean and shall meet therequirements of either Specifications C55,C90,or C129.Thesurface to receive surface bonding mortar shall be free of paint,oil,efflorescence,or foreign materials that interfere withbonding.4.2 Surface bonding mortar shall meet the requirements ofSpecification C887.If the dry mix contains hard lumps,it shallnot be used.4.3 Leveling course shall be bedded with a mortar meetingeither Specification C270 or Specification C887.4.4 Shims shall be corrosion-resistant metal or plastic witha minimum compressive strength of 2000 psi(13.8 MPa),orsteel protected from corrosion by a coating of zinc at least 0.8oz/ft2(2.4 gm/mm2),or by a coating of cadmium or zinc ofequivalent corrosion resistance.1This practice is under the jurisdiction ofASTM Committee C12 on Mortars andGrouts for Unit Masonry and is the direct responsibility of Subcommittee C12.06 onSurface Bonding.Current edition approved Jan.1,2010.Published February 2010.Originallyapproved in 1981.Last previous edition approved in 2001 as C946 91(2001).DOI:10.1520/C0946-10.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from The Masonry Society,www.masonrysociety.org;AmericanConcrete Institute,www.aci-int.org;and American Society of Civil Engineers,www.asce.org.4Available from the National Concrete Masonry Assn.(NCMA),P.O.Box 781,Herndon,VA 22070,http:/www.ncma.org.5Available from Masonry Contractors Association of America(MCAA),33South Roselle Rd.,Schaumberg,IL 60193,http:/www.masoncontractors.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.Leveling Courses5.1 Leveling courses,when needed,are to provide a smoothsurface level within14in.(6.35 mm)in 20 ft(6.1 m),for drystacking concrete masonry units.Leveling courses shall belocated whenever a vertical difference greater than12in.(12.7mm)in 10 ft(3.0 m)occurs within one course.Levelingcourses are usually located on the first course above thefoundation,because footings are not normally placed in a levelcondition,and at each floor level.5.2 When Specification C270 mortar or surface bondingmortar is used a leve