The purpose of this study was to evaluate thermoplastic as a pavement marking material on portland cement concrete and asphaltic concrete pavements. This report summarizes the data collected under Investigation 186 and Special Study 276 and presents guidelines for using thermoplastic on both concrete and bituminous pavements.
The purpose of this study was to evaluate the effect of formed polystyrene concrete cylinder molds on concrete strength. This report describes the various treatments given to cylinders, which were cast in steel, fiber, and polystyrene molds and the statistical analysis which was made on the 28 day compressive strength results. A recommendation is made concerning the use of polystyrene concrete cylinder molds.
This study was initiated to evaluate the performance of a continuously reinforced concrete pavement under the influence of concrete shrinkage, temperature change and traffic. During September and October, 1963, the Minnesota Department of Highways, in co-operation with the Bureau of Public Roads, paved its first continuously reinforced concrete pavement on S.P. 6680-29 (T.H. 35 between the north junction of T.H. 65 at Faribault and 0.2 mile north of junction T.H. 19). The entire project was 10.7 miles in length, with a section of standard jointed pavement adjoining each end of the 5.8 miles of continuously reinforced pavement.
This study was initiated to develop and evaluate a rating system which would be used to help determine the need for resurfacing pavements. In 1965, the Minnesota Highway Department began an accelerated program of highway resurfacing. Because the amount of money available wasn't sufficient to include in the program all the roads which were deemed to be in need of resurfacing, it became necessary to chose the roads which needed resurfacing the most.
The rating system described in this report was originally developed by the Research Section in the spring of 1966. At first it only included concrete pavements but since has been expanded to include both bituminous and bituminous overlaid concrete pavements also. Although some revisions
in the original rating system have been made, the rating system has been used to rate roads in Minnesota every year since 1966.
This investigation was initiated to determine the practicality of using preformed neoprene in lieu of the presently used hot rubber asphalt for resealing transverse joints in old concrete pavements. The transverse joints on two short sections of pavement in the Twin City area were resealed with neoprene to determine the most effective methods for removing the old seal from the joint, repairing spalls where required, and placing the neoprene joint sealer.
On the basis of other studies it was assumed that preformed neoprene would perform better than hot rubber asphalt as a joint sealer. Therefore, the only basis for evaluation in this study is a comparison of the cost of resealing with the new materials. As a result of this cost comparison it is concluded that it is not economically practical to reseal joints in concrete pavements with pre- formed neoprene.
Preformed neoprene has been used almost exclusively during the past. two years to seal transverse joints on new concrete pavement, construction. This use of neoprene in new construction is also being studied and it is anticipated that a progress report on its performance will be completed during 1968
This study was initiated to evaluate Tri-Kote 18 Crect as a concrete treatment. Tri-Kote is a blend of chlorinated rubber, epoxies, and several other materials, which serves as a treatment for both new and old concrete surfaces. According to the manufacturer (T K Products Inc., Minneapolis, Minnesota), Tri-Kote performs as a membrane curing compound and protective treatment against salt scaling for new concrete and as a protective treatment for old concrete. The study of Tri-Kote as a protective treatment for old concrete was assumed not to be essential since the treatment now used (see MHD Specification 3917) is less expensive than Tri-Kote and is considered quite satisfactory from a performance standpoint.
The use of Tri-Kote as a membrane curing compound and protective treatment on new concrete was, however, thought to possibly be more economical than the presently used combination of a polyethylene cure and protective treatment, and was therefore subjected to an evaluation study. Since it was found that Tri-Kote, when applied at a rate somewhat greater than that suggested by the manufacturer, did meet Minnesota Highway Department Specification 3754 for concrete membrane curing compounds, only an evaluation of Tri-Kote as a protective treatment on new concrete was made. This study then consists of a comparison of Tri-Kote treated and non-treated concrete with regards to durability.
This study was initiated to evaluate the effect of foamed polystyrene concrete cylinder molds on concrete strength. The objective of the research was to determine if polystyrene molds: 1) significantly protect concrete cylinders against extremes in temperatures during casting and the initial 24 hour cure period, and 2) eliminate the possible effects of rough handling of specimens which is sometimes encountered in stripping and shipping.
