ETC 1250 Lesson 07c - Lesson 7c mortar F t f rt 1...

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Unformatted text preview: Lesson 7c mortar . . - F t' f rt 1 ' Propertles Of Materlals 3131:1223: Ifher'tlrfrDitsat; one anotherto bondthem to a monolithic structural unit ° Chapter # 7 Seals between the units to Keep water, wind: and pests from entering ' PQS - Cushion the masonry units, giving them full bearing against one another despite their surface irregularities cause metal ties and reinforcing and masonry units to act together in a structural system, Provrde aesthetic qualities to the structurethrough the use of color and type ofjoint Mortar Mortar - Characteristics The ingredients of mortar Plastic — Good Workability means: One or more cementitious materials. Eg. Portland — Mix does not segregate easily cement Easily spread _ Bonding agent Supports the weight of units Makes alignment easy Slaked or hydrated lime Clings to vertical faces of masonry units _ Increases “flow” ofthe mortar Easily forced from mortarrornts Without excessive smearing crean‘ we"_graded aggregate (sand) No tests measure a mortar mix's workability; however. _ Adds strength an experienced mason Wlll be able to tell Water — Hydrates — Enough waterto produce a plastic mix Mortar - Characteristics Mortar - Characteristics Flow is determined by a laboratory - a Bond strength test ' — Most important property A tone 0f mortar is termed OH atable With _ '. — Affected by mortar properties, type and condition of masonry a base dlametel’ 0f 4 In. unit, workmanship, and curing Table is raised and dropped 25 times in — Increase in flow causing an increase in bond strength 15 seconds Diameter of the mortar mass is measured - lfthe original 4—in. diameter expands to 8 ‘- compresswe Strength in__ the mortarwould have a flow Of100% Bond strength. workability: and water retentivity are more Flow values that range from 130 to 150 lmPOHant percent required for construction projects Most masonry construction work is performed utilizing moderate— _ strength mortars Flow after SUCtlon teSt Depends largely upon the quantity of portland cement in the mix - measure water femmiVltY - Increases with an increase in cement content — The ratio offlow after suction to initial - Decreases with an increase in water content flow: expressed as a percentage value — Flow test is repeated afterthe mortar sample has been subjected to a vacuum for one minute Mortar - Characteristics - Reternp-ering — Tho addIt-on ol' wetter to mortar mines that have lost water — Reduces compressive stre:hgthsI but compensated for tn; the increase of the bond strength Usual time lirrst for mortar use is around 21-‘2 hours from lime of Initial minng — Marti,- spcsilwatroiis lIrrIIt 1hr: |1|.|rr|L".':1' UT Ictcrripoiiiigs |.||:r|'-lll.|.’~':-'d as well as set a specified time limit for the use of a mortar mix Types of Mortar - Portland cement. lime. sand. and water — Gonsistcnt hardening rates — High compressive strengths with good durability.I — Good bond strength. Lime produces increased workabilith elastic its and water reten1witv v Proprietary masonry cement hlascnrv cement. sand_ and water — Prelalendecl for convenience _ Normally includes. IIme. an air—mmrning agent. and other II'IQI'EIZIIB'P'ILS II'li'l'llliil'l UFOULIEE dESII’N DI'IZIFI-Eme-S In ITIIZIHBI’S Mortar Production Mortars are tIstIaItt- mixed at the ioosrle Prdchction systems range from: — Altos and 'ahcfitzlarrow crn'odar cotton a mat protect To mechanical paddle mates cepahle at producing r cu 1 per hatch on legs prcq'octs Typically mortar mites are run for 31a 5 minutes — Mrfiscs 'I'l mlxtno 1imes reducc'n'rorltablllh. uniformltv. and u's1cr rctcntion and rpm! "1 IEI'I'II'IZT1I'IEI1 rcqutrcd air contents — Longer misting times may adversely reduce icontatt. m I-sll as loner the strength otthe monais. Trowc‘l-rcadtr mortar systems — Mcrttar Is dctitercd tothc'jdhsitc' In tubs. or by tILillI dctnicn' In a roachI I'I’IIK loci: — The rioders [:IZIME'I‘I SE1 omtrollcrs. with“ We'll: settiogtime ' 253“:th '4: to T2 nous Li'l'y'. crept-ended mortars — Jdcsee staagesild ' if? CIT BAN-En 10-1} DBHB GT D'EDt-EHHEG UP} WHEE- UZI larger 10-bit St [IE - Matt also in Lue- dielrleuded column Basil-I Types of Mortar - Straight lime mortars — Lirric'I sand. and water — Hardened at a slow. Hallstatt: late — LEIW compressive strengths and poor durabilttgr Good workability and high water retentit-ity _ Heals or recordents small cracks - Portland cement mortars Fenland cement. sane. and water - Harden quic H5" _ High compressive strengths with grin-cl tiurltittilit',I — Profitability Is poor and low water retentivity Types of Mortar ASTM EEFIIII recognizes four types of mortars +- Ttrpc I'I-t' mortar — l-bgh-cctTpressI'ue strengths — Greater mraolty than carer manartvpes — Used below grade 'rI luuiidatiui we is. retaining wads. stalks. mole. arid ritarihu'cs * Type S mrtar — MediurrI-hIgh-strength rriortaI — LBW ‘I'I'liEt'E TM M is rscenmcndod. hill DDT"! and IBLEI'H Slfel'lfll'l are WE intpocent — USEfl i'l mm“? 'II'I'TIIEtE rt'rtitrirrurr- flaxtlml strengths are required * Tirpc N mortar - Medlum-strenoth I’I'It‘tlTBr — Llsed atiove grade In severe exposure cditdticns — Llsed Itcluaes chimneys. parapet walls. and edenorhulldirig vtalls 4- Time 0 rmrter — millm-ml-Ettrerhjlh rrnitara — General Interior use I'l nmlciad-beamg walls — Never used ‘I'HlEI'E' may vrIE l:Ie exposedtsotreeze-tha'r.l cyn: lltg ' Wetti'eehefineei . .' ' . 'Wer'wee' ;.1.' .‘lfis-etlteeetee - Grout Mortar is not grout and thetwo are not interchangeable A very fluid combination of water, aggregates. portland cement, blended cements. and sometimes fly ash and admixtures Classified as either — Fine (using only fine aggregates) — Coarse (using a combination of both fine and coarse aggregates) Selection is based on the size of the space to be grouted. Grouts are elements of reinforced concrete masonry — In reinforced load—bearing walls, grout is placed in the wall spaces or cores that contain steel reinforcement to bond the reinforcement to the masonry units 7 Grout may also be used in cores that do not contain steel to further increase the load—carrying capabilities of a wall system Quality of Masonry Construction Construction quality is governed by several factors. including but not limited to — "he knowledge and attitudes relative to required quality levels 7 "he assignment of responsibility for quality construction — Familiar criteria to measure and evaluate levels of quality obtained Hot and cold weather construction and protection requirements are given in figures 7-20 and 7-21 Qua-titty Control — Term used to describe a contractor or manufacturer's effort to achieve a specified end result. It involves measuring, testing. and evaluating a product or process at regular intervals to maintain acceptable levels of quality Quatr'ty Assurance — The measuring. testing. and evaluation done by the purchaser to measure quality obtained in a product or sthcture Assignment Page 348 Review Questions 10, & 11 If you do not understand a question. email me at [email protected] or through myPHCCedu Grout The compressive strengths of grouts vary from 600 to 2500 psi Grouts in place generally have strength values in excess of 2500 psi — Surrounding masonry units absorb waterfrom the grout rapidly - Reducing the in-place water-cement ratio - Causing an increase in compressive strength — Moisture trapped in the surrounding masonry unit produces a moist condition - Essential to hydration and strength gain Grouts are highly fluid for pouring or pumping without segregation — Should flow around the steel and into all masonry voids — B—in. Slumps recommended for low-absorption units — 10-in. Stumps for high—absorption units Quality of Masonry Construction Inspectors must have a very good working knowledge of thejob drawings and specifications as well as a familiarity with reference specifications Architect andtor engineer or their authorized project representatives should be available on site during all phases of construction A sample panel may be requested by the architect '0 see how the wall acts as a unit '0 see the workmanship that will go into the project '0 check color combinations of mortar and masonry "0 check bonding. coursing and thickness ...
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This note was uploaded on 01/05/2011 for the course DRAFTING A ETC 1250 taught by Professor Tomlinson during the Spring '10 term at Pasco-Hernando Community College.

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ETC 1250 Lesson 07c - Lesson 7c mortar F t f rt 1...

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