ACI 548 4-2011 Specification for Latex-Modified Concrete Overlays.pdf

1、ACI 548.4-11Specification for Latex-Modified Concrete OverlaysAn ACI StandardReported by ACI Committee 548First PrintingApril 2012Specification for Latex-Modified Concrete OverlaysCopyright by the American Concrete Institute, Farmington Hills, MI. All rights reserved. This material may not be reprod

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10、 develops.Order information: ACI documents are available in print, by download, on CD-ROM, through electronic subscription, or reprint and may be obtained by contacting ACI.Most ACI standards and committee reports are gathered together in the annually revised ACI Manual of Concrete Practice (MCP).Am

11、erican Concrete Institute38800 Country Club DriveFarmington Hills, MI 48331U.S.A.Phone: 248-848-3700Fax: 248-848-3701www.concrete.orgISBN 978-0-87031-764-4American Concrete InstituteAdvancing concrete knowledgeThis Reference Specification covers styrene-butadiene latex-modi-fied concrete (LMC) as an

12、 overlay on concrete bridge decks and other structures. It applies to both new construction and rehabilita-tion of existing structures. It includes certification requirements of the latex products, storage, handling, surface preparation, mixing, application, and limitations.Keywords: bridge decks; l

13、atex-modified concrete; mixing; resurfacing.CONTENTS(mandatory portion follows)Part 1General, p. 21.1Scope1.2Units1.3Definitions1.4Referenced standards1.5Submittals1.6Quality assurance1.7Storage and handlingSpecification for Latex-Modified Concrete Overlays An ACI StandardReported by ACI Committee 5

14、48Michael S. Stenko, ChairHerschel H. Allen IIIMilton D. AndersonJohn J. BartholomewConstantin BodeaJames T. DikeouGarth J. FallisDavid W. FowlerRobert W. GaulAlbert O. KaedingJohn R. MillironBradley NemunaitisRichard C. PrusinskiMahmoud M. Reda TahaJohn R. RobinsonDonald A. SchmidtQizhong ShengJoe

15、SolomonMichael M. SprinkelDonald P. TragianeseCumaraswamy VipulanandanWafeek S. WahbyHarold H. Weber Jr.David WhiteDavid P. WhitneySpecial acknowledgment to Ahmed Ashraf, Mohammad A. Alhassan, Jacques A. Bertrand, Quentin L. Hibben, Myles A. Murray, Joseph Nuciforo, Michael L. Schmidt, and Richard E

16、. Wollmershauser for their contributions to this specification.Consulting membersLu AnqiZhi-Yuan ChenInz Lech CzarneckiHarold (Dan) R. EdwardsLarry J. FarrellJack J. FontanaDeon KrugerWilliam LeeHenry N. Marsh Jr.Peter MendisYoshihiko OhamaJerzy PietrzykowskiMeyer SteinbergACI 548.4-111ACI Committee

17、 Reports, Guides, and Commentaries are intended for guidance in planning, designing, executing, and inspecting construction. This document is intended for the use of individuals who are competent to evaluate the significance and limitations of its content and recommendations and who will accept resp

18、onsibility for the application of the material it contains. The American Concrete Institute disclaims any and all responsibility for the stated principles. The Institute shall not be liable for any loss or damage arising therefrom.Reference to this document shall not be made in contract documents. I

19、f items found in this document are desired by the Architect/Engineer to be a part of the contract documents, they shall be restated in mandatory language for incorporation by the Architect/Engineer.ACI 548.4-11 supersedes ACI 548.4-93, was adopted December 13, 2011, and published April 2012.Copyrigh

20、t 2012, American Concrete Institute.All rights reserved including rights of reproduction and use in any form or by any means, including the making of copies by any photo process, or by electronic or mechanical device, printed, written, or oral, or recording for sound or visual reproduc-tion or for u

21、se in any knowledge or retrieval system or device, unless permission in writing is obtained from the copyright proprietors.Part 2Products, p. 32.1Materials2.2Mixture proportion2.3ThicknessPart 3Execution, p. 33.1Equipment3.2Construction procedure3.3Very-early-strength latex-modified concrete over-la

22、ys (LMC-VEs)(nonmandatory portion follows)Notes to specifier, p. 5General notesForeword to checklists, p. 6Mandatory Requirements Checklist, p. 8Optional Requirements Checklist, p. 8Submittals Checklist, p. 8(mandatory portion follows)PART 1GENERAL1.1Scope1.1.1 This Specification covers the material

23、s and proce-dures for construction of styrene-butadiene latex-modified concrete (LMC) overlays for new construction as well as repair and rehabilitation of existing bridge decks and other structures.1.1.2 The provisions of this Specification shall govern unless otherwise specified in the Contract Do

24、cuments. In case of conflicting requirements, the Contract Documents shall govern.1.2UnitsValues in this Specification are stated in-inch pound units. A companion specification in SI units is also available.1.3DefinitionsACI provides a comprehensive list of definitions through an online resource, “A

25、CI Concrete Terminology” (http:/terminology.concrete.org). Definitions provided herein complement that source.accepted manufacturera manufacturer that produces latex in compliance with FHWA RD-78-35.hydrodemolition equipmentequipment that removes concrete from a surface by impacting the surface with

26、 water.latex-modified concrete (LMC)hydraulic cement and aggregates combined at the time of mixing with organic polymers that are dispersed or redispersed in water.milling machinesequipment that removes concrete from a surface by impacting the surface with rotating heads.mobile mixerequipment that b

27、atches concrete ingredi-ents by volume and mixes ingredients and discharges mixed ingredients in a continuous fashion using a trough with a rotating auger.scarifiersequipment that removes concrete from a surface by impacting or grinding the surface with rotating blades.very-early-strength latex-modi

28、fied concrete (LMC-VE)LMC that has a minimum compressive strength of 2500 psi at 3 hours of age when tested in accordance with ASTM C39.1.4Referenced standardsStandards referenced in this Specification are listed with their designation and title, including the year of adoption or revision, and are p

29、art of this Specification unless otherwise specified.1.4.1 American Concrete InstituteACI 305.1-06Specification for Hot Weather ConcretingACI 306.1-90 Standard Specification for Cold Weather Concreting1.4.2 ASTM standardsC31/C31M-10Standard Practice for Making and Curing Concrete Test Specimens in t

30、he FieldC33/C33M-11aStandard Specification for Concrete AggregatesC39/C39M-11aStandard Test Method for Compressive Strength of Cylindrical Concrete SpecimensC143/C143M-10aStandard Test Method for Slump of Hydraulic Cement ConcreteC150/C150M-11Standard Specification for Portland CementC172-10Standard

31、 Practice for Sampling Freshly Mixed ConcreteC685/C685M-11Standard Specification for Concrete Made by Volumetric Batching and Continuous MixingC1064/C1064M-11Standard Test Method for Tempera-ture of Freshly Mixed Hydraulic-Cement ConcreteC1438-11aStandard Specification for Latex and Powder Polymer M

32、odifiers for Hydraulic Cement Concrete and MortarC1583/C1583M-04e1Standard Test Method for Tensile Strength of Concrete Surfaces and the Bond Strength or Tensile Strength of Concrete Repair and Overlay Materials by Direct Tension (Pull off Method)C1602/C1602M-06Standard Specification for Mixing Wate

33、r Used in the Production of Hydraulic Cement Concrete1.4.3 Federal Highway AdministrationFHWA RD-78-35Styrene-Butadiene Latex-Modifiers for Bridge Deck Overlays1.4.4 International Concrete Repair Institute (ICRI)ICRI-R310.2-1997Selecting and Specifying Concrete Surface Preparation for Sealers, Coati

34、ngs, and Polymer Overlays (formerly No. 03732)1.4.5 Standards-producing organizationsAmerican Concrete Institute38800 Country Club Dr.Farmington Hills, MI 48331www.concrete.orgAmerican Concrete Institute Copyrighted Materialwww.concrete.org2 SPECIFICATION FOR LATEX-MODIFIED CONCRETE OVERLAYS (ACI 54

35、8.4-11)ASTM International100 Barr Harbor Dr.West Conshohocken, PA 19428-2959www.astm.orgFederal Highway AdministrationOffices of Research and DevelopmentMaterials Division HRS-20Washington, DC 20590www.fhwa.dot.gov1.5Submittals1.5.1 Submit documentation verifying compliance with specified requiremen

36、ts. List of submittals shall include:1.5.1.1 Certification of polymer latex compliance with FHWA RD-78-35 and ASTM C1438;1.5.1.2 Mixture proportion and compressive strength test results of LMC overlay in accordance with 2.2;1.5.1.3 Compressive strength test results of new concrete substrate or bond

37、strength test results of existing concrete substrate; and1.5.1.4 Compressive strength test results of LMC in accor-dance with 3.2.6.1.1.6Quality assurance1.6.1 LabelingEnsure the latex containers have: Name of manufacturer; Manufacturers product identification; and Expiration date.1.7Storage and han

38、dling1.7.1 Storage of materialsStore latex at temperatures between 40 and 85F. Do not allow latex to freeze.1.7.2 Handling of materialsHandle materials to prevent spills and contamination of the environment.PART 2PRODUCTS2.1Materials2.1.1 LatexLatex admixture conforming to the prequali-fication requ

39、irements specified in FHWA-RD-78-35 and ASTM C1438, unless otherwise specified.2.1.2 AggregateASTM C33.2.1.3 CementASTM C150, Types I, II, or III.2.1.4 WaterASTM C1602.2.2Mixture proportion2.2.1 The mixture proportion shall be designed within the limits shown in Table 2.2.1, unless otherwise specifi

40、ed.2.2.2 The mixture proportion shall be designed for a minimum LMC overlay compressive strength of 3000 psi for opening LMC overlay to traffic, unless otherwise specified.2.3Thickness2.3.1 This Specification covers LMC overlays with thick-ness limits of 1.25 in. (minimum) and 4.0 in. (maximum), unl

41、ess otherwise specified.PART 3EXECUTION3.1Equipment3.1.1 Surface preparationUse surface preparation equipment capable of removing deleterious material that would inhibit bond of the overlay. This equipment includes:3.1.1.1 Scarifiers, milling or hydrodemolition equipment capable of removing 1/2 in.

42、or more of concrete from the surface without producing extensive microcracking;3.1.1.2 Blasters (sand, water, and shot) capable of removing laitance, rust scale from reinforcing steel, and chips of partially loosened concrete and extensive micro-cracked concrete;3.1.1.3 Jackhammers (30 lb or less) a

43、nd chipping hammers (15 lb or less); and3.1.1.4 Saws capable of sawing concrete to the specified depth.3.1.2 MixingUse a mobile mixer meeting the require-ment of ASTM C685, with the modifications by section in accordance with Table 3.1.2.3, unless otherwise specified. The mobile mixer shall include

44、the following:3.1.2.1 A delivery capacity of at least 6 yd3/h;3.1.2.2 A meter with a printout to measure and record cement dosage; and3.1.2.3 A water hose and nozzle for spraying the concrete surface before placing overlay.3.1.3 PlacementUse street brooms for brushing mortar fraction of the LMC onto

45、 prepared surface, and use shovels and hoes for spreading newly placed concrete in front of finishing machine. Use spud vibrators for consolidation of concrete thicker than 2.5 in. and concrete that cannot be reached by the finishing machine.3.1.4 FinishingUse the following finishing equipment:3.1.4

46、.1 A self-propelled rotating cylinder machine, either single or double roller, capable of forward and reverse move-ment under positive control. Equip the machine with devices that will automatically and continuously spread, consolidate, and finish the fresh concrete;Table 2.2.1Mixture proportion lim

47、its for LMC overlayMaterial LimitCement content, minimum 658 lb/yd3Latex solids-cement ratio, minimum0.15 lb/lbWater*-cement ratio (w/c), maximum0.40 lb/lbAir content, range 3 to 7 percentSlump, range 4 to 6 in.Coarse aggregate, maximum ASTM C33 No. 7Fine aggregate, range by weight of total aggregat

48、e55 to 70 percent*The solids content of the latex is 46 to 53 percent. The water content of the latex shall be included when calculating the total water content of the mixture.Slump shall be measured between 4 and 5 minutes after discharge.Aggregate size shall be increased to maximum 1/3 of the mini

49、mum overlay thick-ness and mixture proportions adjusted to reduce shrinkage of overlays thicker than 2.5 in.American Concrete Institute Copyrighted Materialwww.concrete.orgSPECIFICATION FOR LATEX-MODIFIED CONCRETE OVERLAYS (ACI 548.4-11) 33.1.4.2 Travel rails for the finishing machine shall be capable of providing support to maintain the finished grade of the LMC overlay;3.1.4.3 A work bridge capable of moving continuously with the finishing machine to facilitate final finishing operations;3.1.4.4 Spud vibrators and