In order to study the relationship between the traffic load and roughness is stiff, in 1949 in Maryland USA has built Test Roads or Road Test with the direction of the Highway Research Board, namely to study and look for relationships between diverse load axis vehicles against performance rigid roughness.Roughness of the concrete on the road test was built as thick horizontal pieces 9 – 7 – 9 inch, the distance between broadcast shrink 40 feet, while the distance between the moving both broadcast 120 feet. For connection use dowel lengthwise 3/4 inch in diameter and a 15 inch in the middle section. Roughness of the concrete test it is reinforced with wire mesh.The purpose of the program is the way this test is to determine the effect of load voltage and configuration on the relative roughness is stiff. The load used is 18,000 lbs and 22,400 pounds for single axis and 32,000 and 44,000 pounds on a double axis. The most important results of this test program is that the development of cracks in concrete plates is due to the occurrence of symptoms of pumping. Lendutan voltage and measured on the road test is the result of pumping.
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