Crumb Rubber Chip Seal East of Punkin Center

1 Report no. COOH-lJTP-R-86-3 Crumb Rubber chip seal east of Punkin Center Robert F. Laforce Cnlorado Department of Hig!Jways Division of Transportation Planning 4201 east Arkansas Avenue Denver. Cnlorado 80222 Final Report Marcil 1985 Prepared in cooperation with the U. S. Department of Transportation Federal Hig!Jway Administration , ~ ~-=-~-. -,. ' The contents of this report reflect the views of the authors who are responsible for the facts and the accuracy of the data presented herein. The contents do not necessarily reflect the official views of the Colorado Department of Highways or the Federal Highway Administration. This report does not constitute a standard, specification, or regulation.

2 I Technical Report Documentation Page I. RcrporJ No. 2. GovernmenT AceO'ss;on No. 3. RO'cq:"ent's Catalog No. CDOH-DTP-R-86-3 -4. Titl. and Sublitl. S. RoporT OcU. March, 1986 Crumb Rubber chip seal east of Punkin Center 6. Porforming O,ganlzotlon Coao . B. P orlorming Orgoni ZOIl on R crport No. 7. Autnor's) Robert F. LaForce CDOH-DTP-R-86-3 9. Porforming Organization Nomo end Adduus 10. Work Unit No. (TRAIS) Colorado Department of Highways Transportation Planning Division II. Conlfact or Grant No. 4201 E. Arkansas Avenue Denver, Colorado 80222 I l. Type 01 Roport ond Cov~red 1:2. Sponsoring Nome end Add,eu Final Colorado Department of Highways 4201 E. Arkansas Avenue 14.

3 Sponsoring Agency Code Denver, Colorado B0222 15. Supplementary NOIII'S prepared in cooperation with the U. S. Department of Transportation, Federal Highway Administration. 16. Ab.'ract This report documents the perfor'lllance of t:"Ubber asphalt binders as chip seal materials. The test sections consisted of two t:"Ubber-asphalt binders, a t:"Ubberized cutback (RC-800, the standard chip seal at the time of constt:"Uction) , and a plain AC-10 chip seal . At the end of the evaluation period, the t:"Ubber asphalt binders had perfor'llled as well as the t:"Ubberized RC-800; however, from an economic standpoint the t:"Ubberized RC-BOO is recommended for use as a chip seal binder on low-volume highway.

4 ImplementatIon Since constt:"Uction of this proj ect, other CDOH studies have shown emulsified polymerized asphalt binders perfor'llled as well or better than the RC-800 t:"Ubberized material at an additional savings.. 17. K oy Words lB. OJ .tt; bution S'otemant chip seal material, t:"Ubber No restrictions: This document is asphalt binder, t:"Ubbet"ized available to the public through cutback, Crumb t:"Ubber the National Infor'lllation Service springfield, Virginia 22161 19. Sec:urity Clouif. (01 'his report) 20. Sac:urity Clolllif. (01 tn,s poge) :21. No. 01 P egos 22. Pric:o Unclassified Unclassified 26 Form DOT F CB-721 Reproduction of completed Cluthori:od ii TABLE OF CONTENTS Page Intt"oduction.

5 1 Constt"Uction Expet"iences .. 3 Post Constt"Uction Evaluation .. 4 Conclusion and Recommendations .. 9 Implementations .. 10 Photogt"aph Sec Hon .. 11 Appendix A .. 18 iii Introduc Hon Crumb Rubber chip seal east of Punkin Center This project was initiated in March, 1978 to evaluate the performance of Rubber -asphalt binders as chip seal materials in eastern Colorado. The chip seal was constructed under Project RS 0094(7), east of Punkin Center , and incorporated test sections using two Rubber -asphalt binders, a rubberized cutback, and a plain AC-10 chip seal . The project is located on State Highway 94, approximately 65 miles east of Colorado Springs, Colorado.

6 The roadway is located at an elevation of approxi-mately 5,000 feet above sea level with an annual precipitation of 14 inches. Most of the land adjacent to the project is grassland, with some dry-land wheat farming. This 28-foot highway is a farm to market road with an average daily traffic volume of 450 vehicles. Figure 1 shows the location of the project area. The majority of the project was to be sealed with a Rubber -asphalt binder manufactured by Sahuaro Petroleum. This material contains 25% scrap Rubber and 75% asphalt cement, by weight. This product uses 100% vulcanized Rubber . In addition to the Sahuaro Crumb Rubber , comparison sections were to be con-structed using another scrap Rubber product manufactured by Arizona Refineries.

7 This material contains approximately 20%'scrap Rubber and 80% asphalt cement. Arizona Refineries uses 40% vulcanized--60% devulcanized Rubber and a finer gradation than Sahuaro's product. Additional sections were constructed using plain AC-IO and Re-800 rub-berized, which was the Department's standard chip seal binder in 1978. The contract specifications for all of the binder materials appear in Appendix A. Approval for the research was obtained from FHWA, and the construction contract was advertised and awarded in April of 1978. 1 FIGURE 1 Crumb Rubber chip seal Project RS 0094(7) east of Punkin Center 2 '--:iT--d=------~,..J I .1 ./' I .. , .. ~) ! ~-: " r--'~-:l I 1---, Arflba 1'1 LINCOLN Project Location SH 94 - east of Punkin Center I , l\ o.

8 ,,~; .. flll!lIt'~' / S.,be'l 7 " 287 C * ~a ~--''''''''''i : Construction Experiences During May of 1978, the area of the test sections was chosen and a precon-struction evaluation of the pavement was performed. Two sets of fQur test sections were chosen approximately three miles apart. Figure 2 shows the layout of the test sections, and the preconstruction evaluation data is included with the post-construction evaluations in Tables Band C. The preconstruction survey data showed that the roadway was in good condition with minimal cracking and rutting and had a fair skid resistance. The major problem noted in the preliminary survey was surface raveling which is shown in Photographs and 2.

9 Construction began on July 5, 1978. The Sahuaro and Arizona Refineries materials were applied using large, specially made, distributor trucks with internal agitators and heaters to handle the Rubber -asphalt material. Both of the Crumb Rubber materials were added to the asphalt cement and then heated to 350-400 degrees F and held at that temperature for approximately one hour. Under these conditions, a reaction takes place between the Crumb Rubber and asphalt cement. The Sahuaro Rubber asphalt was mixed on the job site, while the Arizona Refineries material was mixed at a plant in Flagstaff, Arizona and carried to the job site in a distributor truck. One truck carried enough for the two 500-foot test sections.

10 The rubberized RC-800 and AC-10 test sections were applied using conventional distributor trucks. For this project, the Type II chips were coated with l~ AC-IO and because of scale problems were transported in haul trucks from Colorado Springs, approxi-mately 65 miles west of the project. The chip specification also appears in Appendix A. Additionally, a CSS-1H tack coat was applied to the roadway surface prior to the chip seal . Chips were applied using a Flaherty spreader and rolling was done with two Rubber tired rollers immediately behind the chip spreader. Except for delays caused by the long haul distance for aggregate few problems were encountered Table A lists the application rates for the various binders and aggregate on each of the test 3 sections and the photograph section contains pictures of the chip seal operation and equipment.