1、Designation: C 1142 95 (Reapproved 2007)Standard Specification forExtended Life Mortar for Unit Masonry1This standard is issued under the fixed designation C 1142; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last re
2、vision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers extended life mortar as deliv-ered for use in construction of non-reinforced or reinforced unitmas
3、onry.1.2 This specification is a property standard.1.3 Four types of mortar are covered: RM, RS, RN, and RO.These types of mortar can be manufactured by using one of thefour mortar formulations with masonry aggregate: portlandcement, portland cement-lime, masonry cement, or masonrycement with portla
4、nd cements. The materials are listed inSection 5.1.4 Appendix X1 provides a rationale statement and com-mentary.2. Referenced Documents2.1 ASTM Standards:2C91 Specification for Masonry CementC 144 Specification for Aggregate for Masonry MortarC 150 Specification for Portland CementC 207 Specificatio
5、n for Hydrated Lime for Masonry Pur-posesC 270 Specification for Mortar for Unit MasonryC 780 Test Method for Preconstruction and ConstructionEvaluation of Mortars for Plain and Reinforced UnitMasonryC 1072 Test Method for Measurement of Masonry FlexuralBond StrengthE 447 Test Methods for Compressiv
6、e Strength of Labora-tory Constructed Masonry Prisms3E 518 Test Methods for Flexural Bond Strength of Masonry2.2 Other Document:National Institute of Standards and Technology, Handbook44, Specifications, Tolerances, and Other Technical Re-quirements for Commercial Weighing and MeasuringDevices43. Te
7、rminology3.1 Definitions of Terms Specific to This Standard:3.1.1 All terms in this specification have their conventionalmeaning, except as follows:3.1.2 extended life mortarsmortar consisting of cementi-tious materials, aggregate, water and set-control admixtureswhich are measured and mixed at a ce
8、ntral location, usingweight-or-volume-control equipment. This mortar, as deliveredto a construction site, shall be usable for a period in excess of212 h.4. Ordering Information4.1 The purchaser shall specify the following:4.1.1 The mortar type in Table 1,4.1.2 Length of workability time for the mort
9、ar, and4.1.3 Desired consistency satisfactory for the masons usewhen tested by the manufacturer in accordance with 10.2.4.2 At the request of the purchaser, the producer shall, priorto delivery, furnish laboratory and field performance datasatisfactory to the purchaser that the materials to be used
10、willproduce mortar of the type specified.NOTE 1The purchase order or contract may list the mortar ingredientsdesired and may state a list of optional data, which are in addition to theperformance requirements in Section 7. Examples of such tests are: TestMethod C 1072, Test Methods E 518, Test Metho
11、ds E 447, and test datafor mortar that has been retempered.5. Materials5.1 Materials used as ingredients in extended life mortarshall conform to the requirements specified in 5.1.1 through5.1.4.2.5.1.1 Cementitious MaterialsCementitious materials shallconform to the following ASTM specifications.5.1
12、.1.1 Portland CementTypes I, II or III of SpecificationC 150.5.1.1.2 Masonry CementTypes M, S, or N of Specifica-tion C91.1This specification is under the jurisdiction of ASTM Committee C12 onMortars and Grouts for Unit Masonry and is the direct responsibility of Subcom-mittee C12.03 on Specificatio
13、ns for Mortars.Current edition approved June 1, 2007. Published July 2007. Originally approvedin 1990. Last previous edition approved in 2001 as C 1142 95 (2001).2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book
14、of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Withdrawn.4Available from Superintendent of Documents, U.S. Government PrintingOffice, Washington, DC 20402.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 1
15、9428-2959, United States.5.1.1.3 Hydrated LimeSpecification C 207, Type S.NOTE 2Type N limes may be permitted if shown by test or perfor-mance record to be not detrimental by the autoclave expansion.5.1.2 AggregatesThe aggregate shall comply with Speci-fication C 144.5.1.3 WaterWater shall be clean
16、and free of oils, acids,alkalies, salts, organic materials or other substances that maybe deleterious to mortar or corrosive to metals in the masonry.5.1.4 AdmixturesAdmixtures are permitted for use only atthe production plant.5.1.4.1 Evidence satisfactory to the purchaser shall beprovided to show t
17、hat the admixtures do not cause noraccelerate corrosion of metal which will be in contact withmortar.5.1.4.2 Any admixture to be used shall be subject to writtencertification from the manufacturer, supported by evidence thatthe admixture will have no adverse effect on the long-termstrength, durabili
18、ty, or appearance of the mortar nor on anymaterial or component in contact with the mortar, nor anyassemblage of which the mortar forms a part.6. Manufacture and Delivery6.1 Storage of MaterialsCementitious materials and ag-gregates shall be stored in such a manner as to preventdeterioration and con
19、tamination.6.2 Measurement of MaterialsMeasure materials in ac-cordance with 6.2.1 through 6.2.4.6.2.1 Cementitious materials and the aggregate shall bemeasured by weight or by volume. Volumetric measurementshall be calibrated by weight.6.2.2 Scales for batching mortar ingredients shall conformto th
20、e applicable sections of the current edition of the NationalInstitute of Standards and Technology, Handbook 44.6.2.3 Measure water by weight or by volume.6.2.4 Measure admixtures by weight or by volume.6.3 MixingMix extended life mortar ingredients at acentral location using either truck mixers or s
21、tationary mixers.6.3.1 Agitation, not mixing, is allowed during transport.6.4 DeliveryUnless otherwise specified, a delivery of themortar shall conform to 6.4.1 and 6.4.2.6.4.1 Thoroughly mix and deliver to the construction sitemortar with a satisfactory degree of workability and withoutsegregation
22、of ingredients.6.4.2 Temperature of the mortar at time of delivery shall be40 to 120F (4 to 49C).7. Property Requirements7.1 When sampled and tested in accordance with Sections 9and 10 respectively, the mortar shall comply with the appro-priate sections of Table 1.7.2 A test for compressive strength
23、 is the average of at leastthree specimens from one batch.7.3 Mortar of known higher strength shall not be indiscrimi-nately substituted when a mortar type of anticipated lowerstrength is specified.7.4 Do not change the established proportions for extendedlife mortar designed for a particular job, n
24、or utilize materialswith different physical characteristics in the mix unless com-pliance with the requirements of this specification are reestab-lished.7.4.1 Alter the dosage of the admixture which controls thesetting time when needed to maintain a similar time of setduring seasonal temperature cha
25、nges.NOTE 3Consistency of the mortar should be correlated with theparticular masonry unit to be used because certain mortars are morecompatible with certain masonry units. The specifier should consult theadmixture manufacturer to evaluate the interaction of the mortar type andmasonry unit specified.
26、 Masonry units having a high initial rate ofabsorption will have greater compatibility with mortar of high-waterretentivity. Refer to the Related Items That Have an Effect on Propertiessection in Appendix X1 of Specification C 270.8. Field Practice8.1 Tempering MortarsMortars that have stiffened due
27、 toloss of water by evaporation shall be re-tempered not morethan one time during the working life of the mortar by addingwater to restore the required consistency.8.1.1 Do not use mortar beyond the period of time estab-lished by the manufacturer. This time period shall be docu-mented with test data
28、.NOTE 4Extended life mortar is usually designed to have a workabilityperiod between 24 to 36 h.8.2 Storage at the SiteThe mortar shall be protected fromfreezing and evaporation.9. Sampling9.1 Sampling MaterialsThe mortar materials for labora-tory tests shall be sampled at the plant where the mortar
29、ismanufactured. Water, aggregate and cementitious materialshall be sampled in accordance with Test Method C 780.9.2 Sampling Plastic Mortar at the PlantDischarge fromthe mixer a thoroughly mixed sample of mortar not less than 4gal (15 L) into a nonabsorptive container, from which thequantity of mort
30、ar required for a specific quality control testcan be taken.9.3 Sampling Plastic Mortar at the SiteObtain a compos-ite sample by combining at least three equal portions fromseparate mortar containers, producing a quantity not less than4 gal (15 L) in a nonabsorptive container, from which thequantity
31、 of mortar required for a specific test can be taken.9.4 Record sampling procedures to include the date, time,place, method of sampling, and weather conditions.TABLE 1 Property Specification RequirementsMortar TypeAvgACompressiveStrengthat 28 days,min psi, (MPa)WaterRetentionmin, %AirContent,Bmax, %
32、CubesRM 2500 (17.2) 75 18RS 1800 (12.4) 75 18RN 750 (5.2) 75 18RO 350 (2.4) 75 18ATwenty-eight days old from date of casting. Refer to 10.3.1. The strengthvalues as shown are the standard values. Intermediate values may be specified inaccordance with project requirements.BWhen structural reinforceme
33、nt is incorporated in mortar, the maximum aircontent shall be 12 %, or bond strength test data shall be provided to justify higherair content.C 1142 95 (2007)210. Testing10.1 Test field and laboratory prepared trial mixtures ofplastic mortar in accordance with 10.2 through 10.6.1.10.2 ConsistencyDet
34、ermine the consistency of the mortarby the cone penetration method, according to Test MethodC 780.10.2.1 Specimens for compressive strength testing shallhave a cone penetration of 55 6 5 mm (unless the purchaserspecifies otherwise).10.3 Compressive StrengthFabricate specimens for com-pressive streng
35、th tests according to Test Method C 780. Use2-in. (50.8-mm) cubes, 2 by 4-in. (50.8 by 101.6-mm) cylin-ders or 3 by 6-in. (76.2 by 152.4 mm) cylinders conforming toTest Method C 780.10.3.1 When converting from cylinder strength to cubestrength, the relationship shall be documented by the producerwit
36、h test data.10.3.2 Storing, Curing and TestingStore, cure and testspecimens according to Test Method C 780, with the exceptionthat the test specimens shall be at least 4 days old, and haveattained final set when transported from the field to thelaboratory. Store specimens in a laboratory moist room
37、ormoist closet for not less than 20 h prior to demolding.NOTE 5Final set may be determined by preparing at least one extraspecimen for compressive strength. Demold the extra specimen in the fieldin order to establish that final set has occurred by visually inspecting thestate of hardness after demol
38、ding.NOTE 6Plastic mortar may be transported from the field to thelaboratory in order to establish conformance.10.3.3 Test the specimens in a moist condition for compres-sive strength at 28 days from the date of casting.10.3.4 The compressive strength of mortar will be consid-ered satisfactory if th
39、e average of all specimens, at least threespecimens from each batch, is equal to or exceeds the mini-mum specified strength in Table 1, when tested in accordancewith requirements of Section 10.10.3.5 Faulty specimens and those with individual strengthsdiffering by more than 10 % from the average sha
40、ll not beincluded in the reported average compressive strength madefrom the same sample and tested at the same period.10.3.6 After discarding faulty specimens or strength values,a minimum of two specimens or strength values must remainfor determining the compressive strength at any given period.10.4
41、 Air ContentDetermine air content of the mortar byeither the pressure method or the volumetric method accordingto Test Method C 780.10.5 Water RetentionConduct the water retention test inaccordance with Specification C91with the following excep-tions:10.5.1 Manufacture mortar according to Section 6,
42、 andsample mortar according to Section 9.10.5.2 Drop the flow table 15 times in 9 s both before andafter suction.10.6 RecordsUpon completion of the testing, furnish tothe purchaser complete records of sampling and test results.10.6.1 Report specific evidence of the appearance of faultyspecimens.11.
43、Inspection11.1 The purchaser shall afford the manufacturer all reason-able access for the procurement of samples of fresh mortar atthe job site to determine conformance to this specification.12. Rejection and Rehearing12.1 The purchaser may reject mortar that fails to conformto the requirements of t
44、his specification. Rejection should bereported to the manufacturer promptly and in writing. In caseof dissatisfaction with the results of the test, the manufacturermay make claim for a rehearing.13. Batch Ticket Information13.1 The manufacturer of the mortar shall furnish to thepurchaser a delivery
45、ticket which shows the following infor-mation for each batch:13.1.1 Name of extended life mortar manufacturer andbatch plant and trade names of admixtures used,13.1.2 Serial number of ticket,13.1.3 Date and time the mortar was produced,13.1.4 Truck or vehicle delivery number,13.1.5 Name of purchaser
46、,13.1.6 Specific designation of job (name and location),13.1.7 Specific type of mortar ordered and delivered,13.1.8 Amount of mortar delivered in cubic yards (or cubicmeters), and13.1.9 A location for the signature or initials of purchasersrepresentative.14. Certification14.1 When specified in the p
47、urchase order or contract, theproducers certification shall be furnished to the purchaserstating that the materials used and the mortar delivered havebeen manufactured and tested in accordance with this specifi-cation and the requirements have been met. This statementshall be included with the test
48、reports upon completion of thework.14.2 Additional information available, when specified, mayinclude test results related to preconstruction, and constructiontest specimens of masonry assemblages using the mortar withjob units. Refer to Note 1 for examples of such tests.15. Specification Limitations
49、15.1 There is no ASTM standard method for measuring thecomposition or physical properties of hardened mortars from astructure.16. Keywords16.1 air content; compressive strength; masonry; masonrycement; mortar; portland cement-lime; set-retarding admix-ture; water retentionC 1142 95 (2007)3APPENDIX(Nonmandatory Information)X1. RATIONALE STATEMENT AND COMMENTARYX1.1 History of DevelopmentX1.1.1 Extended life mortar with an extended board life wassuccessfully developed in Germany in 1970 to 1973. Since thattime it has been successfully used in Switze
