ACI 549.2R-2004 Report on Thin Reinforced Cementitious Products《细增强胶凝产品的报告》.pdf

1、ACI 549.2R-04Report on Thin Reinforced Cementitious ProductsReported by ACI Committee 549(Reapproved 2013)First PrintingMay 2004Report on Thin Reinforced Cementitious ProductsCopyright by the American Concrete Institute, Farmington Hills, MI. All rights reserved. This material may not be reproduced

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11、n Concrete Institute38800 Country Club DriveFarmington Hills, MI 48331U.S.A.Phone: 248-848-3700Fax: 248-848-3701www.concrete.orgISBN 978-0-87031-156-7American Concrete InstituteAdvancing concrete knowledgeACI 549.2R-04 became effective May 19, 2004.Copyright 2004, American Concrete Institute.All rig

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15、any loss or damage arising therefrom.Reference to this document shall not be made in contractdocuments. If items found in this document are desired by theArchitect/Engineer to be a part of the contract documents, theyshall be restated in mandatory language for incorporation bythe Architect/Engineer.

16、549.2R-1It is the responsibility of th e user of this document toestablish health and safety practices appropriate to the specificcircumstances involved with its use. ACI does not make anyrepresentations with regard to health and safety issues and theuse of this document. The user must determine the

17、applicability of all regulatory limitations before applying thedocument and must comply w ith all applicable laws andregulations, including but not limited to, United StatesOccupational Safety and Health Administration (OSHA)health and safety standards.Report on Thin ReinforcedCementitious ProductsA

18、CI 549.2R-04Thin reinforced cementitious products offer a useful balance of propertiessuch as strength, toughness, environmental durability, moisture resistance,dimensional stability, fire resistance, esthetics, and ease of handling andinstallation. The growing emphasis on environmental durability a

19、nd fireresistance of cementitious products has led to their increased use worldwide.This report summarizes the current knowledge of reinforcements, manufac-turing methods, engineering properties, and applications of thin reinforcedcementitious products.Keywords: cement-based composites; cement board

20、s; cement panels;composite materials; concrete panels; ductility; durability; engineeringproperties; ferrocement; f iber-reinforced cement-based materials; f ibers;flexural strength; manufacturing methods; mesh reinforcement; reinforcingmaterials; toughness.CONTENTS Chapter 1Introduction, p. 549.2R-

21、2Chapter 2 Reinforcement types and reinforcing mechanisms, p. 549.2R-22.1Discontinuous or discrete reinforcing fibers2.2Continuous reinforcing fibers2.3Reinforcing meshes and mats2.4Reinforcing mechanismsChapter 3Manufacturing methods of thin reinforced cementitious products, p. 549.2R-83.1Hatschek

22、process3.2Simultaneous spray process3.3Premix process3.4Extrusion process3.5Filament winding process3.6Filter-press process3.7Compression molding process3.8Processes with continuous reinforcementReported by ACI Committee 549M. ArockiasamyJohn JonesD. V. ReddyP. N. BalaguruJames R. McConaghySurendra

23、P. ShahHiram P. BallBarzin MobasherYixin ShaoNemkumar BanthiaHenry J. Molloy Anil K. SharmaGordon B. Batson John L. MulderParviz SoroushianJames I. Daniel Antoine E. NaamanNarayan SwamyDavid M. Gale Antonio Nanni George J. VentaGraham T. GilbertNandakumar NatarajanRobert C. ZellersAntonio J. Guerra

24、P. Paramasivam Ronald F. ZolloNeeraj J. BuchChairAshish Dubey*Secretary*Chair of the subcommittee responsible for preparing this report.Co-chair of the subcommittee responsible for preparing this report.Members of the subcommittee responsible for preparing this report.(Reapproved 2013)549.2R-2 ACI C

25、OMMITTEE REPORTChapter 4Engineering properties of thin reinforced cementitious products, p. 549.2R-114.1Natural/cellulose fiber-reinforced products4.2Glass fiber-reinforced products4.3Polymer fiber-reinforced products4.4Carbon fiber-reinforced products4.5Hybrid fiber-reinforced products4.6Mesh/mat-r

26、einforced productsChapter 5Applications of thin reinforced cementitious products, p. 549.2R-185.1Claddings5.2Roofing panels and tiles5.3Substrate panels5.4Ducts, channels, and conduits5.5Linings5.6Pipes and poles5.7Acoustical wall panels and noise barriers5.8Permanent formwork5.9Parapets5.10Landscap

27、ing productsChapter 6Summary, p. 549.2R-24Chapter 7References, p. 549.2R-247.1Referenced standards and reports7.2Cited references7.3Other referencesCHAPTER 1INTRODUCTIONThin reinforced cementitious products are used widelytoday in a variety of applications worldwide. Thin reinforcedcementitious prod

28、ucts are strong, possess superior deform-ability characteristics and enhanced impact and fatigueresistanceproperties that are of great value in many practicalapplications. The aforementioned performance characteristicsresult primarily due to the inclusion of reinforcement in thecementitious matrixes

29、 of these products. In the past, asbestosfibers were the popular form of reinforcement in manufac-turing thin cementitious products because asbestos fibers werewidely available, inexpensive, possessed favorableprocessing characteristics, and provided significantimprovements in strength and toughness

30、 characteristics ofcements and mortars (Table 1.1). The use of asbestos fibers,however, continues to decline rapidly due to the serious healthhazard risk to people involved in handling asbestos fibers andproducts. Consequently, other reinforcement materials havebeen developed to replace asbestos fib

31、ers in thin cementitiouscomposites. These reinforcements are available in differentgeometric configurations such as discrete fibers, continuousfibers, and meshes. The former can be classified as adiscontinuous reinforcement and the latter two as continuousreinforcement. The choice of reinforcement i

32、n terms of materialtype and geometric configuration has a significant influence onthe engineering properties of the resulting thin cementitiousproducts. Thin cementitious products that incorporate metalmeshes as reinforcement are commonly referred to asferrocement. A detailed description of metal ma

33、ts andmeshes and products made thereof is covered in ACI 549Rand not covered in this report. Readers are referred to thatdocument for further information. Thin cementitiousproducts may contain both discontinuous and continuousreinforcements to produce products possessing tailoredperformance characte

34、ristics.Typical applications of thin reinforced cementitious productsinclude exterior faade claddings, architectural elements,roofing panels and tiles, substrate panels for installation oftiles and other finishes, tunnel and sewer linings, cable ducts,permanent formwork, and pipes. Thin reinforced c

35、ementitiousproducts have the ability to satisfy diverse requirements inthese applications, such as strength, deformability, environ-mental durability, moisture resistance, dimensional stability,fire resistance, and rapid and economic construction.As diverse are the reinforcement and the applications

36、 ofthin reinforced cementitious products, so are the manufacturingmethods to produce these products. A variety of cost-effectiveand rapid manufacturing methods have been developed toproduce thin reinforced cementitious products havingdiverse performance characteristics and a range of geometricand ae

37、sthetic features. Popular manufacturing methods of thinreinforced cementitious products are described in this report.Chapter 2 describes different types of reinforcements usedto produce thin reinforced cementitious products. Knownand popular manufacturing methods of thin reinforcedcementitious produ

38、cts are described in Chapter 3. Chapter 4describes the engineering properties of thin reinforcedcementitious products. Finally, different applications of thinreinforced cementitious products are highlighted in Chapter 5.CHAPTER 2REINFORCEMENT TYPESAND REINFORCING MECHANISMSA variety of reinforcement

39、 types are used to manufacturethin reinforced cementitious products today. These reinforce-ments can be broadly classified into three categories:Discontinuous or discrete reinforcing fibers;Continuous reinforcing fibers; andReinforcing meshes.Discrete (discontinuous) fibers are the most popular form

40、of reinforcement used in thin cementitious products.Discrete fibers are made from a variety of materials and areavailable in different lengths and diameters. Examples ofdiscrete fiber reinforcements include natural/cellulosefibers, glass fibers, polymer (polyvinyl alcohol and polypro-pylene) fibers,

41、 and carbon fibers. Continuous reinforcing fibersmade from materials such as glass and polymers have alsobeen used to manufacture thin cementitious products.Table 1.1Mechanical properties of cement paste, cement mortar, and asbestos cement (Studinka 1989; Hannant 1978)Material typePropertyFlexural s

42、trength, MPaTensile strength, MPaElasticmodulus, GPaTensile strain at failure, %Cement paste 7 to 8 3 to 6 15 0.01 to 0.05Cement mortar 2 to 4 25 to 35 0.005 to 0.015Asbestos cement30 to 40 17 to 20 28 to 35 0.40 to 0.50THIN REINFORCED CEMENTITIOUS PRODUCTS 549.2R-3Meshes are yet another form of rei

43、nforcement that arebecoming increasingly popular in thin cementitious products.The performance characteristics of thin reinforced cementitiousproducts depend significantly on the type of reinforcement used.2.1Discontinuous or discrete reinforcing fibers2.1.1 Natural/cellulose fibersFigure 2.1 illust

44、rates thestructure of wood. A piece of lumber may have defects, suchas knots or cracks, that adversely affect its strength. A pieceof clear wood (nearly defect-free at a macroscopic level)would have a tensile strength of approximately 70 MPa. Asingle wood fiber (natural/cellulose fiber), which const

45、itutesthe reinforcing unit of bulk wood, however, can have tensilestrength greater than 700 MPa (Coutts 1983).The major chemical components of wood are cellulose,hemicellulose, lignin, and a small fraction of extractives.Natural/cellulose fibers, in their natural arrangement in soft-woods and in har

46、dwoods, are bonded together by a layer ofamorphous cementing material. In the cellulose fiberproduction (pulping) process, this cementing material isbroken by either chemical or mechanical means to obtain theindividual cellulose fibers.Pulping processes are classified as chemical, semichemical,or me

47、chanical, based on how the original fibrous structure isbroken down. This classification refers to the nature of theprocess used to separate the fibers. In the mechanical pulpingprocess, frictional forces, often aided by steam pressure,separate the fibers. In the chemical process, the fibers aresepa

48、rated from one another primarily by dissolving andremoving the natural bonding agent. Semichemicalprocesses use a combination of chemical reactions andmechanical power to achieve the same objective (Kocurekand Stevens 1983; Suchsland and Woodson 1986). Chemicalpulp, also called kraft pulp, is common

49、ly used in the productionof book paper and writing paper, whereas mechanical pulp isused regularly for the manufacture of newsprint.Among commercial trees, softwoods are the source ofso-called long fibers. The length of unbroken cellulose fibersin important softwoods ranges between 2.5 to 7 mm, but thevast majority of fibers are between 3 to 5 mm in length. Evenwithin the same tree species, fiber lengths can vary considerably.The diameter of softwood cellulose fibers ranges between 15and 80 microns, but the majority of fibers ar