Design verification of surface treatments through test method MoDOT T 72 and section 409 from the state of Missouri and its possible inclusion to argentinian standards

Abstract

This paper verifies the relations among the specifications given by the Construction Materials and Transport Department of the State of Missouri, United States –Test Method MoDOT T 72 Sweep Test of Bituminous Surface Treatment Sample– and Section 409–Seal Coat– with the established specifications in the National Road Department folder from Argentina, considering further adjustments arising in the LEMaC in order to get a higher representation in relation to the field. For that purpose, it was designed a simple surface treatment using the dosage method proposed by Tagle –known as the 9-5-3 Rule– and a seal coat with crushing sand. This surface treatment is submitted to the Sweep Test, and taking into account the values given by the Section 409 from MoDOT, the dosage method efficiency is evaluated. The results were analyzed and a comparison was made between the dosage method and the specifications given in Section 409 –according to the seal coat gradation and the losses from the test. National Specifications have no numerical restrictions of such a loss, excepting the field experience and the test results where the surface treatment is already used to produce absence of roughness on a surface and the friction coefficient, besides the material parameters. Based on the experimentation tested a recommendation is given for a possible inclusion into the specifications referred.