. Engineering and Contracting . nt to 4 partsmixed aggregate, approximately the proportions used on theElkhart-Osceola Road, but the concrete was tested at an ageof tour months instead of 2S days. A similar series of tests made at the Structural MaterialsResearch Laboratory on the effect of consistency and timeof mixing shows values ranging from to 11/2 in. for 1:4gravel concrete at an age of two months. The results indicate that the resistance to wear and thecompressive strength are unusually high for field concretemade under these conditions, and constitute a distinct recom-mendation fo
. Engineering and Contracting . nt to 4 partsmixed aggregate, approximately the proportions used on theElkhart-Osceola Road, but the concrete was tested at an ageof tour months instead of 2S days. A similar series of tests made at the Structural MaterialsResearch Laboratory on the effect of consistency and timeof mixing shows values ranging from to 11/2 in. for 1:4gravel concrete at an age of two months. The results indicate that the resistance to wear and thecompressive strength are unusually high for field concretemade under these conditions, and constitute a distinct recom-mendation for slag as a concrete highway material whenproperly selected and used. Eliminating Binder Course of Asphalt Pave-ments by Corrugating Concrete Base A specially designed tamper is used by the city of Tren-ton, N. J., for corrugating concrete base for the purpose ofeliminating the binder course in asphalt pavements. This method and tamper has been in use In the city sincethe earlv part of 1912. During the last 7 years over T: Used by City of Trenton
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Keywords: ., bookcentury1900, bookdecade1900, bookpublisherchicago, bookyear19
