ACI-325.5R-1990.pdf
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1、A C 1 325.5R 90 Obb2949 0023898 4 I R. L. Duncan Chairman, AC1 325 R. O. Albright W. Abu-Onk G. E. Bollin J. A. Breite B. Colucci M. I. Darter R. J. Fluhr W. C. Creer, Jr. S. D. Kohn AC1 325.5R-90 Design of Continuously Reinforced Concrete Pavement for Airports Reported by AC1 Committee 325 S. D.Tay
2、abji Secretary, AC1 325 T. J. Larsen R. A. McComb, Sr. B. F. McCullough C. P. Meglan J. I. Mullarky T. J. Pasko, Jr. R. W. Piggott S, A. Ragan R. S. Rollings J. L. Rice* Chairman, CRCP Task Group M, A. Sargious T. W. Sherman* D. C. Staab William V. Wagner, Jr.* C. P. Weh* G. E. Wkson W. A. Yrjanson
3、M. L. Cawley* (Associate Member) A design procedure for continuously reinforced concrete pavement for airports is reported. A method is presented to compute slab thickness and rein forcing requirements. Reinforcement detailing and special treatmenfs for pavement ends are discussed. Keywords: airport
4、s; concrete pavements: concrete slabs: continuously rein- forced pavements; detailing; reinforcing steels; structural design; thickness. CONTENTS Chapter 1 -Introduction, p. 325.5R-1 Chapter 2-Purpose, p. 325.5R.2 Chapter 3-Material specifications, p. 325.5R-2 3.1-Deformed reinforcement 3.2-Concrete
5、 Chapter 4-Pavement thickness design, p. 325.5R-3 Chapter 5-Reinforcement design, p. 325.5R-6 4.1-Example method 5.1-CRCP design equation 5.2-Reinforcement to resist temperature effects 5.3 Strength ratio 5.4-Transverse reinforcement 5.5-Crack width and spacing 5.6-Reinforcement detailing AC1 Commit
6、tee Reports, Guides, Standard Practices, and Commentaries are intended for guidance in designing, pan- ning, executing, or inspecting construction and in preparing specifications, Reference to these documents shall not be made in the Project Documents. If items found in these documents are desired t
7、o be part of the Project Documents they should be phrased in mandatory language and incorporated into the Project Documents. Chapter 6-Pavement jointing, p. 325.5R-9 Chapter 7-Terminal treatments, p. 325.5R-10 Chapter 8- Design example, p. 325.5R-IO 8.1-Slab thickness 8.2-Reinforcement design 8.3-Fi
8、nal design Chapter 9- References, p. 325.5R-12 9.1-Specified and/or recommended references 9.2-Cited and other references CHAPTER 1 -INTRODUCTION A continuously reinforced concrete pavement (CRCP) is a portland cement concrete pavement with continuous longitudinal reinforcement and no interme- diate
9、 transverse expansion or contraction joints. Trans- verse reinforcement may also be included. Transverse reinforcement normally is used in continuously rein- forced concrete pavements for airports since the ap- plied loads are not as directional as highway-type load- ings. Continuously reinforced co
10、ncrete pavements for airports normally contain from 0.5 to 1.0 percent lon- gitudinal reinforcement and about 0.05 to 0.1 percent transverse reinforcement. Members of Task Force. Copyright O 1989, American Concrc stitute. M-righfs reserved including rights of reproduction and use in any form or by a
11、ny means, including the making of copies by any photo process, or by any electronic or mechanical device, printed, written, or oral, or recording for sound or visual reproduction or for use in any knowledge or retrieval system or de- vice, unless permission in writing is obtained from the copyright
12、proprietors. 325.5R-1 Copyright American Concrete Institute Provided by IHS under license with ACI Licensee=IHS Employees/1111111001, User=listmgr, listmgr Not for Resale, 03/05/2007 01:07:26 MSTNo reproduction or networking permitted without license from IHS -,-,- 325.5R-2 A C 1 325.5R 90 W Ob62949
13、 0023899 b W MANUAL OF CONCRETE PRACTICE Although use of CRCP is widespread in highway ap- plications, its use for airports has been relatively lim- ited. The largest airport application of CRCP to date is at an U.S. Air Force facility in Palmdale, Calif. Other airport CRCP applications include OHar
14、e Interna- tional Airport and Midway Airport, Chicago, Ill.; Richmond International Airport in Richmond, Va.; John F. Kennedy International Airport in Jamaica, N.Y .; Wold-Chamberlain International Airport in St. Paul, Minn.; Glenview Naval Air Station, Glenview, 111.; and Patuxent Naval Air Station
15、 in Patuxent, Md. Some of the earlier applications of CRCP on air- ports were not successful. Premature failures occurred due to insufficient slab thickness or keyed joint defi- ciencies. While these failures were the result of inade- quate design, they resulted in relatively slow acceptance of CRCP
16、 for airport applications; however, valuable lessons were learned. The performance of CRCP on airports where ade- quate slab thicknesses and properly designed joints were provided has been good. The main advantage of continuously reinforced concrete pavement is the elim- ination of transverse contra
17、ction joints, which are costly to construct and maintain. CRCP usually pro- vides a very smooth riding surface. A properly de- signed CRCP typically develops regularly spaced, hair- line transverse cracks at 3 to 10 ft (1 to 3 m) intervals. The resultant pavement is composed of a series of short sla
18、bs held tightly together by the longitudinal rein- forcement. A high degree of shear transfer across the cracks is assured because the cracks are held tightly closed. To provide cost-effective CRCP for airports, the cost of providing continuous reinforcement must be less than or equal to the cost of
19、 constructing and maintain- ing joints in conventional jointed concrete pavements, given equal usable lives. CHAPTER 2-PURPOSE The purpose of this report is to present a design pro- cedure for CRCP for airports. The design procedure consists of: (a) determining CRCP thickness, (b) deter- mining long
20、itudinal reinforcement, (c) determining transverse reinforcement, and (d) designing terminal treatment. The thickness design procedure is based on the stipulation that the same slab thickness be used for CRCP as would be determined for plain jointed con- crete pavement. The performance of earlier CR
21、CP designed for airport use indicates that reduced thick- nesses are not adequate. CRCP performance at air- ports has been quite good where the thickness of the CRCP was comparable to the thickness of plain jointed concrete pavement. CHAPTER 3-MATERIAL SPECIFICATIONS Materials used in the constructi
22、on of CRCP should conform to accepted standards as outlined in this chap- ter. 3.1 -Deformed reinforcement Reinforcement should be specified on the basis of yield strength. The recommended minimum yield strength of longitudinal reinforcement is 60,000 psi (414 MPa). The recommended minimum yield str
23、ength of transverse reinforcement is 40,000 psi (276 MPa). All reinforcement should be deformed, and deformed bars should conform to ASTM A 615, A 616, A 617, or A 706. Deformed welded wire fabric should conform to ASTM A 497. The reasons for recommending a lower minimum yield strength for transvers
24、e reinforcement are as fol- lows. First, transverse reinforcement must sometimes be field bent and later straightened during construction of multiple lanes. Lower yield strength reinforcement is less likely to break during field bending. Second, lower yield strength reinforcement usually is less cos
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