the 58 refers to the probable high pavement temperature 58 u00b0 c 136 u00b0 f expected for the life of the construction project the u2212 28 refers to the probable low pavement temperature u2212 28 u00b0 c u2212 18 u00b0 f expected for the life of the construction project the asphalt specifications required for a given construction project are typically stated as listed below dsr 1 min rtfot loss 1 00 max rtfot dsr 64 2 20 min pav dsr 22 5000 max bbr s 18 300 max bbr m 18 0 300 min in the above specification dsr means dynamic shear rheometer and represents a measurement or indication of viscosity rtfot means rolling thin film oven test and is a measurement of the ability of asphalt to resist rut formation pav means pressure aging vessel bbr means bending beam rheometer and is a measure of the ability of asphalt to resist deformation the method used to ascertain the advantages of using the lpp asphalt additives of this invention measuring the properties of an unmodified i e no lpp additive base asphalt especially one that did not meet the above specifications then some of the lpp additive of this invention was mixed with the base asphalt so as to comprise 2 weight percent of the final asphalt binder formulation finally the properties of the modified asphalt were measured if the properties of the.