Comparative Study of the Physical Properties of Traffic Paints

Traffic or zone paints have become a major item of expenditure for highway departments with their increasing mileages and with the increase in traffic using the highways. Extending the mileage requiring marking and increasing the traffic wear on the marking has necessitated successively larger purchases of paint and associated equipment. As this market became larger increasing numbers of manufacturers have entered the field with a great diversity of formulations having differing properties. In order to bring some order out of this situation the Research Laboratory in cooperation with the Division of Traffic undertook a study of the paints as offered by some of the principal producers. Toward this end one-gallon samples of such paints as the producers deemed worthy of consideration were procured - some were purchased and some were donated. The choice was left to the discretion of the manufacturer in order to assure procurement of paints which are currently in production and which the maker would like to sell. Previous experience with samples obtained from brokers and distributers has indicated that they are not reliable sources of either fresh samples or the latest formulations. This procedure, of course, leads to the possibility of obtaining hand-picked or laboratory made paints which are better than production runs of the same formula. Any apprehension on this point can be relieved by further testing of any paints purchased in quantity to assure their compliance with specifications and performance of the original specimen

Evaluation of Traffic Paint in 1952

Following the program of in-service transverse stripe evaluation coupled with laboratory study of traffic paint samples submitted by various manufacturers who propose to bid on the Departments paint requirements, field stripes were placed August 19, 1952. For this test stripes were placed in the same general location as that used the two previous years (U.S. 27 south of Lexington at the junction of the concrete and bituminous pavements). Gradings contained herein were made December 27, 1952, and thus represent a somewhat premature five-month evaluation. However, the set of stripes placed in 1951 were scrutinized since they had sixteen months of service, and those paints which appeared in good condition in both groups have been selected as the most desirable and are recommended. In the case of paints which were placed this year but were not previously tested, no discrimination was made except to note the evaluation as tentative and subject to change as more data became available

Prefabricated Neoprene Joint Sealer

On November 18, 1948, the assembly of joints with prefabricated neoprene sealers was demonstrated by representative of the Lastite Joint Company, 105 W. Madison Street, Chicago 2, Illinois, on the construction project on U.S. 27, about 5 miles south of Alexandria. Installation was not possible at that time due to the fact that the contract was temporarily without cement. Installation was made on November 30, 1948, under the supervision of a representative of the company. This installation was not completely satisfactory due to the inexperience of the paving crew with this type of joint. The joint at Station 622÷22 was knocked askew by the finishing machine and makes an angle of about 20° with the vertical at one end (See Fig. 1). Another of the joints has an offset at the center of the joint, the cause of which is not known (See Fig. 2). The third joint resulted in a placement where the depth of the rubber with respect to the pavement surface varies, probably due to finishing difficulties and setting of the joint

Atomic Energy Commission Report AECD-4205

Abstract: "A monel metal rod mill has been designed, built, and tested for grinding five hundred gram batches of anhydrous tuballoy tetrafluoride to a fineness such that one hundred per cent will pass an eighty mesh screen; the grinding being accomplished without loss of material, and with the addition of less than two hundred parts per million of contaminating metals. The grinding time per batch is not more than fifty minutes.