C:Documents and SettingsMMy DocumentsPrint …

1 Custom Specification-GradeMasonry MortarsSPEC- joint 46 Mortars for Compliance with Engineering Performance & Proportion SpecificationsOver million sq. ft. of repointing were completed at the State University of New York at buffalo usingSpec joint 46 Type N, Custom Color#963. Consistent results were achieved, even though work was performed over a three year period, by two different masonry Mortar ReplicationRepointing of the Historic Union Station in St. Louis was performed using a customformulated spec joint 46 to match appearance and composition of the original 1896 Coatings, Repointing MortarsCustom matched mortars were produced to meet exacting project specifications for repointingof the Washington Monument in : spec joint 46is aseries of custommatched, prepackaged,cement-lime and limemortars for use in newconstruction andrestoration.

2 Five of theavailable types (M, S,N, O, K) are formulatedin accordance withASTM C-270specifications toprovide consistent,reliable results in bothperformance andappearance. The sixthtype (Type L) is anall-lime mortarformulated to complywith the guidelines inNational Park ServicePreservation Briefs #2on Repointing AT 28 DAYS, PSI (MPa)M2500 ( )S1800 ( )N750 ( )O350 ( )K, LHigh Lime MortarsSPEC joint 46is simplymixed with water prior touse, and is applied inaccordance with standardpractices for use ofmasonry USE LIME INMORTAR?

3 Lime-based mortars are designedfor long-term durability andcompatibilitywithmasonrybuildings and structures. Theyprovide benefits not equaled bymasonry cement or plasticizedcement designed lime mortars:rBondtenaciouslytomasonrywithout addedplasticizers or bonding agentsrMaintain high moisturevapor permeability, allowingmasonry to breathe rRelieve the stresses ofexpanding and contractingmasonry unitsHYDRATED LIME ORLIME PUTTY? spec - joint 46mortars utilizehydrated dolomitic lime meetingthe requirements of ASTM C207 Type S, assuring that propermortar performance is SA air-entraining lime or high calcium limesare also available when the pre-industrial era, the machinery to producehydrated lime was not readily available.

4 Thoughhydrated lime was known to provide lowershrinkage and higher strength than lime putty,excess water was added as a convenience. Limeputty is hydrated lime with excess lime does not require aging in puttyform to develop plasticity and water lime putty masonry mortarsare also available from Edison Coatings. They areparticularlyprizedfortheirexceptional workability in decorative plaster lime can be used as the solitary binder inhistoric mortar, or can be blended with natural orportland cements to achieve mortars of differentstrengths for different uses.

5 19th Century mortarscommonly incorporated natural cement rather thanportland, and are available as EdisonRosendale12 Mmasonry SELECTION:The following is a general guide for selection ofmortar for various applications. It is recommendedthat specifiers also consider building codes,engineering requirements, skill of the installer andtype of masonry units to be used. See ASTMC-270,Standard Specification for Mortar for UnitMasonry, for further ,abovegradeLoad-bearingwallNS or MNon-loadbearing wallO*NorSParapet wallNN or SExterior, ator belowgradeFoundationwall, retainingwall,manholes,sewers,pavements, walks, patiosS**M or NInteriorLoad bearingwallNS or MExterior,SpecialUseHistoric**N, O, K, orL**N, O, K, LSPEC- joint 46 Today hydrated lime is efficiently andeconomically produced without the need forexcess water.

6 And ASTM C207 Type S limedoes not require aging in putty Lime CycleLIMESTONE, CaCO3/MgCO3,used in production of lime, isblasted from quarry ,added in a calciner,raises rock temperature to10000C (18000F), driving offcarbon dioxide ,CO2+=QUICKLIME,CaO/MgO,ASTM C5 COVERAGE:Each 50 pound bag ofSPECJOINT46produces approximately cubic foot of repointing work, thiswill fill approximately250 lin. ft. of 3/8" widejoints at ,CaO/MgO,ASTM C5+WATER, H2O,is added ina hydrator under is LIME,Ca(OH)2/Mg(OH)2 ASTM C207(Stoichiometric Water)orLIME PUTTYASTM C1489 HYDRATED LIME orLIME PUTTYCa(OH)2/Mg(OH)2,Component in MasonryMortar, ASTM C270+=CARBON DIOXIDE,CO2,from theatmosphere, generallydissolved in waterCarbonated Lime,CaCO3/MgCO3,inMasonry MortarAPPLICATIONM asonry Repointing Guidelines1.

7 joint PreparationA. Remove old mortar to a depth of 2 to 2 timesthe width of the joint - typically to 1 Remove additional mortar below this depth if loose or Avoid damage to masonry units through use of proper tools and use ofexperienced, skilled Rinse joints with clean water to remove dust and debris. Joints shouldbe damp but free of standing water when filled. Pre-dampen extremelyporous substrates for up to several hours, if necessary, to avoid Mortar PreparationA. Use onlySPEC joint 46and water, unless otherwise with clean water, free of oils.

8 Acids, alkali, salts, organic materials,or any other substance that may be deleterious to mortar or metal in themasonry assembly. Admixtures such as coloring pigments, air entrainingagents, accelerators, retarders, water repellents, anti-freeze compoundsand other admixtures should not be added to mortar unless specified andapproved by Edison Coatings, Inc. Do not add cement, bonding agents,plasticizers or other materials unless specifically Add approximately half the volume of mixing water required to amechanical mortar mixer, and mix for 5 minutes.

9 Add the remainingwater, a little at a time, until the desired working consistency is water may vary slightly from batch to batch, depending on weatherconditions. Use only the amount of water required to produce the desiredworkability, in order to minimize shrinkage and facilitate Use all mixes within 30 minutes of final mixing, and discard unusedportion at that time. Do not re-temper (Do not add more water).3. Filling & Tooling JointsA. Fill in 1/4 inch lifts . Start by filling deeper sections, compactingeach layer, packing it into the rear and corners of the joint .

10 Mechanicalauger-type pointing guns can also be used without addition of specialadmixtures. Filling should still be performed in lifts, As soon as the mortar reaches thumbprint hardness, apply the nextlayer at " thickness. Several layers may be Allow each layer time to harden before proceeding to the next. Most ofthe shrinkage in mortar occurs during this hardening stage, and propertiming will minimize overall shrinkage and When the final lift is thumbprint hard, tool to specified profile. Forlocalized repointing, match to adjacent, existing profile, or as Proper tooling and timing is important for uniform color.