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Showing 1-5 of 12 Abstracts search results

Document: 

SP169-02

Date: 

May 1, 1997

Author(s):

Donald F. Meinheit and Wilfried H. Riesterer

Publication:

Symposium Papers

Volume:

169

Abstract:

Methyl-methacrylate (MMA) based polymer concretes have been used for thin overlays, patching repairs, and bearing pad applications since the late 1970’s. These polymer concretes are moisture and wear resistive and have been used to protect embedded reinforcing steel from corrosion attack. This paper reports on the condition of a post-tensioned parking garage that was repaired in 1983 using a thin mma polymer concrete overlay. An earlier paper reported on the garage condition, repair methods and materials (1). Comments will be made on the overlay wear, cracking, bonding to the substrate, continued corrosion of embedded reinforcing steel, and surface delaminations after 13 years of service. Comparisons of conditions in 1981 and 1995 are also made. Comments on the success of the application with respect to structural integrity and material durability are made at the end of the paper.

DOI:

10.14359/5929


Document: 

SP169-10

Date: 

May 1, 1997

Author(s):

James E. Maass

Publication:

Symposium Papers

Volume:

169

Abstract:

The I-80 Donner Pass job was a watershed in the history of polyester-styrene polymer concrete highway overlay; the culmination of approximately ten year’s research and test jobs by Cal-Trans. Completed in 1986, the lo-lane-mile job was highly successful. This paper reviews criteria used to select the overlay chemistry, procedures, equipment and suppliers used in the job; as well as the 1988 review by the senior materials and research engineer. The paper includes nine-year wear data by Cal-Trans and a look forward by individuals currently involved in on-going overlay projects being specified by Cal-Trans. Based on the success of this l-80 job, Cal-Trans continues to specify polyester-styrene polymer concrete for bridge decks and highway overlays.

DOI:

10.14359/5937


Document: 

SP169-03

Date: 

May 1, 1997

Author(s):

Michael Sprinkel

Publication:

Symposium Papers

Volume:

169

Abstract:

The performance of polymer concrete bridge deck overlays ranging in age from 6 to 19 years is presented. The performance is based on tests for tensile bond strength, permeability to chloride ion, thickness and skid number. The physical and mechanical properties of the concretes used, the types of uses, the application methods, and the economics, are also described. It is shown that multiple-layer epoxy, multiple-layer epoxy urethane, and premixed polyester styrene polymer concrete overlays can provide skid resistance and protection against intrusion by chloride ions for 20 years or more and are an economical technique for extending the life of concrete decks reinforced with black steel, particularly when overlays must be constructed during off-peak traffic periods to minimize inconvenience to motorists. Also, multiple-layer polyester overlays have a life of ten years.

DOI:

10.14359/5930


Document: 

SP169-08

Date: 

May 1, 1997

Author(s):

Jamal-Aldin H. Zalatimo and David W. Fowler

Publication:

Symposium Papers

Volume:

169

Abstract:

Several overlay test sections were placed on two bridge decks and a section of a concrete approach pavement in Fort Worth, Texas, about five years ago. Different monomers, primers, mix designs, and construction methods were used. The same materials were investigated extensively in the laboratory. The test sections were open to regular traffic and tested several times over the past five years. The results and conclusions of this experimental program are presented here.

DOI:

10.14359/5935


Document: 

SP169-07

Date: 

May 1, 1997

Author(s):

P. D. Carter

Publication:

Symposium Papers

Volume:

169

Abstract:

This paper reports on the overall field performance and some of the lessons learned from more than 100 thin polymer overlays in the province of Alberta, Canada. These overlays were applied between 1985 and 1995 as maintenance work to existing concrete decks, where it was thought that protection against moisture and chloride absorption was needed to reduce the rate of bridge deck deterioration. The paper is intended to answer the basic question what has been learned from ten years of thin overlay experience? Two measures of field performance are presented on overlays in service for up to ten years with special attention to overlays aged from eight to ten years. Various types of polymer overlay failures are discussed. The reported field performance suggests that different proprietary polymer overlay materials have varying degrees of resistance to degradation by ultraviolet radiation. The physical properties of the proprietary overlay materials change with time and exposure conditions. The materials appear to lose flexibility and compatibility with concrete at diiering rates. Field performance indicates that the type of aggregate used in the thin overlay systems also affects the overlay performance and compatibility with concrete. The aggregates contribute significantly to the durability of the overlays. Workmanship, as reflected by contractor experience, is shown to be a significant service life factor. Field experience shows that polymer overlays have been effective in increasing the durability of non-air-entrained concrete exposed to aggressive environments, but the effectiveness was reduced when reflective cracks propagate from the deck through the polymer overlay. Most bridge deck cracks have not reflected through the overlays after eight to ten years in service and remain sealed by the polymer overlays. Reflective cracks are different from most bridge deck cracks in that they require special repairs to prevent propagation through the overlay within a period of several years.

DOI:

10.14359/5934


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