1、ACI 548.4M-11Specification for Latex-Modified Concrete OverlaysAn ACI StandardReported by ACI Committee 548(metric)First PrintingJune 2012Specification for Latex-Modified Concrete OverlaysCopyright by the American Concrete Institute, Farmington Hills, MI. All rights reserved. This material may not b
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11、(MCP).American Concrete Institute38800 Country Club DriveFarmington Hills, MI 48331U.S.A.Phone: 248-848-3700Fax: 248-848-3701www.concrete.orgISBN 978-0-87031-772-9American Concrete InstituteAdvancing concrete knowledgeAn in.-pound version of this document (ACI 548.4-11) is available at www.concrete.
12、org.This Reference Specification covers styrene-butadiene latex-modi-fied concrete (LMC) as an 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,
13、 handling, surface preparation, mixing, application, and limitations.Keywords: bridge decks; latex-modified concrete; mixing; resurfacing.CONTENTS(mandatory portion follows)Part 1General, p. 21.1Scope1.2Units1.3Definitions1.4Referenced standards1.5Submittals1.6Quality assurance1.7Storage and handlin
14、gSpecification for Latex-Modified Concrete Overlays An ACI StandardReported by ACI Committee 548Michael S. Stenko, ChairHerschel H. Allen IIIMilton D. AndersonJohn J. BartholomewConstantin BodeaJames T. DikeouGarth J. FallisDavid W. FowlerRobert W. GaulAlbert O. KaedingJohn R. MillironBradley Nemuna
15、itisRichard C. PrusinskiMahmoud M. Reda TahaJohn R. RobinsonDonald A. SchmidtQizhong ShengJoe SolomonMichael M. SprinkelDonald P. TragianeseCumaraswamy VipulanandanWafeek S. WahbyHarold H. Weber Jr.David WhiteDavid P. WhitneySpecial acknowledgment to Ahmed Ashraf, Mohammad A. Alhassan, Jacques A. Be
16、rtrand, Quentin L. Hibben, Myles A. Murray, Joseph Nuciforo, Michael L. Schmidt, and Richard E. Wollmershauser for their contributions to this specification.Consulting membersLu AnqiZhi-Yuan ChenInz Lech CzarneckiHarold (Dan) R. EdwardsLarry J. FarrellJack J. FontanaDeon KrugerWilliam LeeHenry N. Ma
17、rsh Jr.Peter MendisYoshihiko OhamaJerzy PietrzykowskiMeyer SteinbergACI 548.4M-11(metric)1ACI Committee 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 t
18、o evaluate the significance and limitations of its content and recommendations and who will accept responsibility 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
19、 loss or damage arising therefrom.Reference to this document shall not be made in contract documents. If 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
20、.ACI 548.4M-11 supersedes ACI 548.4-93, was adopted December 13, 2011, and published June 2012.Copyright 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 o
21、r mechanical device, printed, written, or oral, or recording for sound or visual repro-duction or for use 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 3Exe
22、cution, p. 33.1Equipment3.2Construction procedure3.3Very-early-strength latex-modified concrete overlays (LMC-VEs)(nonmandatory portion follows)Notes to specifier, p. 5General notesForeword to checklists, p. 6Mandatory Requirements Checklist, p. 8Optional Requirements Checklist, p. 8Submittals Check
23、list, p. 8(mandatory portion follows)PART 1GENERAL1.1Scope1.1.1 This Specification covers the materials 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
24、.1.1.2 The provisions of this Specification shall govern unless otherwise specified in the Contract Documents. In case of conflicting requirements, the Contract Documents shall govern.1.2UnitsValues in this Specification are stated in SI units. A companion specification in in.-pound units is also av
25、ailable.1.3DefinitionsACI provides a comprehensive list of definitions through an online resource, “ACI 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.
26、hydrodemolition equipmentequipment that removes concrete from a surface by impacting the surface with 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 remo
27、ves concrete from a surface by impacting the surface with rotating heads.mobile mixerequipment that batches 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 fr
28、om a surface by impacting or grinding the surface with rotating blades.very-early-strength latex-modified concrete (LMC-VE)LMC that has a minimum compressive strength of 17 MPa at 3 hours of age when tested in accordance with ASTM C39/C39M.1.4Referenced standardsStandards referenced in this Specific
29、ation are listed with their designation and title, including the year of adoption or revision, and are part of this Specification unless otherwise specified.1.4.1 American Concrete Institute305.1-06Specification for Hot Weather Concreting306.1-90Standard Specification for Cold Weather Concreting1.4.
30、2 ASTM StandardsC31/C31M-10Standard Practice for Making and Curing Concrete Test Specimens in the 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
31、Hydraulic Cement ConcreteC150/C150M-11Standard Specification for Portland CementC172-10Standard 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 Freshl
32、y Mixed Hydraulic-Cement ConcreteC1438-11aStandard Specification for Latex and Powder Polymer Modifiers 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 Mat
33、erials by Direct Tension (Pull off Method)C1602/C1602M-06Standard Specification for Mixing Water 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
34、 (ICRI)ICRI-R310.2-1997Selecting and Specifying Concrete Surface Preparation for Sealers, Coatings, 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 C
35、opyrighted Materialwww.concrete.org2 SPECIFICATION FOR LATEX-MODIFIED CONCRETE OVERLAYS (ACI 548.4M-11)ASTM International100 Barr Harbor Dr.West Conshohocken, PA 19428-2959www.astm.orgFederal Highway AdministrationOffices of Research and DevelopmentMaterials Division HRS-20Washington, DC 20590www.fh
36、wa.dot.gov1.5Submittals1.5.1 Submit documentation verifying compliance with specified requirements. 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
37、accordance with 2.2;1.5.1.3 Compressive strength test results of new concrete substrate or bond 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: Na
38、me of manufacturer; Manufacturers product identification; and Expiration date.1.7Storage and handling1.7.1 Storage of materialsStore latex at temperatures between 4 and 29C. Do not allow latex to freeze.1.7.2 Handling of materialsHandle materials to prevent spills and contamination of the environmen
39、t.PART 2PRODUCTS2.1Materials2.1.1 LatexLatex admixture conforming to the prequali-fication requirements specified in FHWA-RD-78-35 and ASTM C1438, unless otherwise specified.2.1.2 AggregateASTM C33/C33M.2.1.3 CementASTM C150/C150M, Types I, II, or III.2.1.4 WaterASTM C1602/C1602M.2.2Mixture proporti
40、on2.2.1 The mixture proportion shall be designed within the limits shown in Table 2.2.1, unless otherwise specified.2.2.2 The mixture proportion shall be designed for a minimum LMC overlay compressive strength of 21 MPa for opening LMC overlay to traffic, unless otherwise specified.2.3Thickness2.3.1
41、 This Specification covers LMC overlays with thick-ness limits of 30 mm (minimum) and 100 mm (maximum), unless otherwise specified.PART 3EXECUTION3.1Equipment3.1.1 Surface preparationUse surface preparation equipment capable of removing deleterious material that would inhibit bond of the overlay. Th
42、is equipment includes:3.1.1.1 Scarifiers, milling or hydrodemolition equipment capable of removing 13 mm 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
43、of partially loosened concrete and extensive micro-cracked concrete;3.1.1.3 Jackhammers (13.5 kg or less) and chipping hammers (7 kg 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/C685M, with the modifi
44、cations by section in accordance with Table 3.1.2.3, unless otherwise specified. The mobile mixer shall include the following:3.1.2.1 A delivery capacity of at least 4.5 m3/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 conc
45、rete surface before placing overlay.3.1.3 PlacementUse street brooms for brushing mortar fraction of the LMC onto 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 65 mm and conc
46、rete that cannot be reached by the finishing machine.3.1.4 FinishingUse the following finishing equipment:3.1.4.1 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 auto
47、matically and continuously spread, consolidate, and finish the fresh concrete;Table 2.2.1Mixture proportion limits for LMC overlayMaterial LimitCement content, minimum 390 kg/m3Latex solids-cement ratio, minimum0.07 kg/kgWater*-cement ratio (w/c), maximum0.2 kg/kgAir content, range 3 to 7 percentSlu
48、mp, range 102 to 153 mmCoarse aggregate, maximum ASTM C33/C33M No. 7Fine aggregate, range by weight of total aggregate55 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 s
49、hall be measured between 4 and 5 minutes after discharge.Aggregate size shall be increased to maximum 1/3 of the minimum overlay thick-ness and mixture proportions adjusted to reduce shrinkage of overlays thicker than 65 mm.American Concrete Institute Copyrighted Materialwww.concrete.orgSPECIFICATION FOR LATEX-MODIFIED CONCRETE OVERLAYS (ACI 548.4M-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
