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Home My WebLink AboutHARMONY CENTER JFK PKWY IMPROVEMENTS - Filed PD-PAVEMENT DESIGN REPORT -REPORT OF PAVEMENT DESIGN HARMONY CENTRE COLLEGE AVENUE, HARMONY ROAD AND JFK PARKWAY IMPROVEMENTS AT HARMONY CENTRE FORT COLLINS, COLORADO PROJECT NO. 20985048 May 6, 1998 I erracon REPORT OF PAVEMENT DESIGN HARMONY CENTRE COLLEGE AVENUE, HARMONY ROAD AND JFK PARKWAY IMPROVEMENTS AT HARMONY CENTRE FORT COLLINS, COLORADO PROJECT NO. 20985048 May 6, 1998 Prepared for. SAUNDERS CONSTRUCTION INC. 6950 SOUTH JORDAN ROAD P. O. BOX 3908 ENGLEWOOD, COLORADO 80155 ATTN: MR. MIKE KARLSON PROJECT MANAGER Prepared by: Terracon 301 North Howes Street Fort Collins, Colorado 80521 Irerracon May 6, 1998 Saunders Construction P. O. Box 3908 Englewood, Colorado 80155 Irerracon 301 N. Howes • P.O. Box 503 Foil Collins, Colorado 80521-0503 970) 484-0359 Fax: (970) 484-0454 Attn: Mr. Mike Karlson, Project Manager Re: Report of Pavement Design Harmony Centre - College Avenue, Harmony Road and JFK Parkway Improvements at Harmony Centre Fort Collins, Colorado Project No. 20985048 Terracon has completed a pavement design for the proposed off -site street improvements for Harmony Centre located at the intersection of College Avenue and Harmony Road, Fort Collins, Colorado. This study was performed in general accordance with our proposal number D2098070 dated March 19, 1998. The results of our pavement design including design criteria and the pavement recommendations are attached. A preliminary geotechnical report containing subsurface data was prepared for the site by Terracon April 16, 1998. We appreciate the opportunity to be of service to you on this phase of your project. If you have any questions concerning this report, or if we may be of further service to you, please do not hesitate to contact us. t_ Sincerely, Of PROFfgs TERRACON °.`E;ATE;y y Prepared by: e . eviewe by' AIMPG eil 0/• Y• SHEP O°illiam J. Attwoolh, R. h rrod p90FESSIONa' Senior Engineering Geologist Office Manager Copies to: Addressee (2) City of Fort Collins Engineering - Mr. Rick Richter (1) City of Fort Collins Engineering - Mr. Keith Meyers (1) Arizona Arkansas Colorado Idaho Illinois Iowa Kansas Minnesota Missouri Montana Nebraska Nevada New Mexico North Dakota Oklahoma Tennessee Texas Utah Wisconsin Wyoming Quality Engineering Since 1965 Terracon TABLE OF CONTENTS Page No. Letterof Transmittal.............................................................................................................ii INTRODUCTION.................................................................................................................1 PROPOSEDCONSTRUCTION..........................................................................................1 PAVEMENT RECOMMENDATIONS...................................................................................1 Pavement Design and Construction........................................................................ 2 GENERALCOMMENTS..................................................................................................... 5 APPENDIX A Pavement Analysis Terracon REPORT OF PAVEMENT DESIGN HARMONY CENTRE COLLEGE AVENUE HARMONY ROAD AND JFK PARKWAY IMPROVEMENTS AT HARMONY CENTRE FORT COLLINS, COLORADO Project No. 20985048 May 6, 1998 INTRODUCTION This report contains the results of our pavement design for the proposed off-street improvement for the Harmony Centre located at the northeast corner of College Avenue and Harmony Road, Fort Collins, Colorado. The site is located in the Southwest 1/4 of Section 36, Township 7 North, Range 69 West of the 6th Principal Meridian. The purpose of these services is to provide pavement sections for the proposed off -site improvements adjacent to the Harmony Centre, Fort Collins, Colorado. The conclusions and recommendations contained in this report are based upon the results of field and laboratory testing, engineering analyses, our experience with similar soil conditions and our understanding of the proposed project. A preliminary geotechnical engineering report was prepared for the site by Terracon dated April 16, 1998. PROPOSED CONSTRUCTION The project as we understand it is based on plans prepared by Drexel Barrell & Company dated February 24, 1997. The proposed improvements are to consist of a deceleration lane along northbound College Avenue into the Harmony Centre. Acceleration and deceleration lanes are to be constructed along Harmony Road at the intersection of JFK Parkway, the entrance to the Harmony Centre and at College Avenue and Pavilion Lane. JFK Parkway will be extended northward from Harmony Road to where the existing pavement ends north of the Harmony Centre project. PAVEMENT RECOMMENDATIONS Based on the subsurface conditions encountered at the site, it is our opinion the proposed pavement construction is feasible at the site from a geotechnical engineering point of view. Asphaltic concrete underlain by crushed aggregate base course, full -depth asphalt pavement and nonreinforced concrete pavement are feasible alternatives for the proposed 1 Geotechnical Engineering Exploration Terracon Saunders Construction Project No. 20985048 pavement sections. Based on the subsurface conditions encountered at the site, it is recommended that all street improvements except for the portion of JFK Parkway north of Harmony Town Centre be designed using an "R" value of 12. The portion of JFK Parkway north of Harmony Town Centre may be designed using an "R" value to 25. The equivalent daily axle loads (EDLAs) were provided by the City of Fort Collins. Pavement Design and Construction Design of pavements for the project have been based on the procedures outlined in the 1986 Guideline for Design of Pavement Structures by the American Association of State Highway and Transportation Officials (AASHTO) and City of Fort Collins criteria and the following data. For flexible pavement design, a terminal serviceability index of 2.5 was utilized and a design life of 20 years. Using the correlated design R-values, appropriate ESAL/day, environmental criteria and other factors, the structural numbers (SN) of the pavement sections were determined on the basis of the 1986 AASHTO design equation. Street Name/Street Type 18 kip EDLA ESALs Reliability R Value Structural No. College Avenue/Major Arterial 450 3,285,000 90 12 3.99 Harmony Road/Major Arterial 400 2,292,000 90 12 3.78 JFK Parkway through Harmony Centre/Minor Arterial 120 876,000 90 12 3.27 JFK Parkway North of Harmony Centre/Minor Arterial 120 87,600 90 25 2.56 Pavilion - Collector 42 306,600 85 12 2.66 Local drainage characteristics of proposed pavement areas are considered to vary from fair to good depending upon location on the site. For purposes of this design analysis, fair drainage characteristics are considered to control the design. These characteristics, coupled with the approximate duration of saturated subgrade conditions, results in a design drainage coefficient of 1.0 when applying the AASHTO criteria for design. In addition to the flexible pavement design analyses, a rigid pavement design analysis was completed, based upon AASHTO design procedures. Rigid pavement design is based on an evaluation of the Modulus of Subgrade Reaction of the soils (K-value), the Modulus of Rupture of the concrete, and other factors previously outlined. The design K-value of 100 and 140 pounds per cubic inch (pci) for the subgrade soil was determined by correlation to the laboratory tests results. A modulus of rupture of 600 psi (working stress 450 psi) was used for pavement concrete. The rigid pavement thicknesses for each traffic category were determined on the basis of the AASHTO design equation. 2 Geotechnical Engineering Exploration Terracon Saunders Construction Project No. 20985048 Recommended alternatives for flexible and rigid pavements, summarized for each street, are as follows: Street Alternative Recommended Pavement Thicknesses (Inches) Asphalt Concrete Surface Aggregate Base Course Plant -Mixed Bituminous Base Portland Cement Concrete Total College Avenue A 6 12 18 B 4 7 11 C 9 9 Harmony Road A 6 10 16 B 4 6 10 C 8'/2 8'/z JFK Parkway Through the Site A 5 10 15 B 4 4Yz 8'/2 C 7'/2 7'/2 JFK Parkway A 4 8 12 North of Site B 3 4 7 C 7 7 Pavilion Lane A 4 8 12 B 3 4 7 C 6 6 Each alternative should be investigated with respect to current material availability and economic conditions. Aggregate base course (if used on the site) should consist of a blend of sand and gravel which meets strict specifications for quality and gradation. Use of materials meeting Colorado Department of Transportation (CDOT) Class 5 or 6 specifications is recommended for base course. Aggregate base course should be placed in lifts not exceeding six inches and should be compacted to a minimum of 95% Standard Proctor Density (ASTM D698). Asphalt concrete and/or plant -mixed bituminous base course should be composed of a mixture of aggregate, filler and additives, if required, and approved bituminous material. 3 Geotechnical Engineering Exploration Terracon Saunders Construction Project No. 20985048 The bituminous base and/or asphalt concrete should conform to approved mix designs stating the Hveem properties, optimum asphalt content, job mix formula and recommended mixing and placing temperatures. Aggregate used in plant -mixed bituminous base course and/or asphalt concrete should meet particular gradations. Material meeting Colorado Department of Transportation Grading C or CX specification is recommended for asphalt concrete. Aggregate meeting Colorado Department of Transportation Grading G or C specifications is recommended for plant -mixed bituminous base course. Mix designs should be submitted prior to construction to verify their adequacy. Asphalt material should be placed in maximum 3-inch lifts and should be compacted to a minimum of 95% Hveem density (ASTM D1560) (ASTM D1561). Where rigid pavements are used, the concrete should be obtained from an approved mix design with the following minimum properties: Modulus of Rupture @ 28 days .................................................. 600 psi minimum Strength Requirements.........................................................................ASTM C94 Minimum Cement Content............................................................6.5 sacks/cu. yd. Cement Type................................................................................. Type I Portland Entrained Air Content................................................................................. 4 to 8% Concrete Aggregate ........................................ ASTM C33 and CDOT Section 703 Aggregate Size............................................................................ 1 inch maximum Maximum Water Content........................................................ 0.49 lb/lb of cement Maximum Allowable Slump.......................................................................4 inches Concrete should be deposited by truck mixers or agitators and placed a maximum of 90 minutes from the time the water is added to the mix. Other specifications outlined by the Colorado Department of Transportation should be followed. Longitudinal and transverse joints should be provided as needed in concrete pavements for expansion/contraction and isolation. The location and extent of joints should be based upon the final pavement geometry and should be placed (in feet) at roughly twice the slab thickness (in inches) on center in either direction. Sawed joints should be cut within 24- hours of concrete placement, and should be a minimum of 25% of slab thickness plus 1/4 inch. All joints should be sealed to prevent entry of foreign material and dowelled where necessary for load transfer. 4 Geotechnical Engineering Exploration Terracon Saunders Construction Project No. 20985048 GENERAL COMMENTS Terracon should be retained to review the final design plans and specifications so comments can be made regarding interpretation and implementation of our geotechnical recommendations in the design and specifications. Terracon also should be retained to provide testing and observation during excavation, grading, and pavement construction phases of the project. In the event that any changes of the proposed project are planned, the conclusions and recommendations contained in this report should be reviewed and the report modified or supplemented as necessary. The analyses and recommendations in this report are based in part upon data obtained from the borings performed at the indicated locations and from other information discussed in this report. This report does not reflect variations which may occur between borings or across the site. The nature and extent of such variations may not become evident until construction. If variations appear, it will be necessary to reevaluate the recommendations of this report. The scope of services for this project does not include either specifically or by implication any environmental assessment of the site or identification of contaminated or hazardous materials or conditions. If the owner is concerned about the potential for such contamination, other studies should be undertaken. This report has been prepared for the exclusive use of our client for specific application to the project discussed and has been prepared in accordance with generally accepted geotechnical engineering practices. No warranties, either express or implied, are intended or made. In the event that changes in the nature, design, or location of the project as outlined in this report, are planned, the conclusions and recommendations contained in this report shall not be considered valid unless Terracon reviews the changes, and either verifies or modifies the conclusions of this report in writing. 5