Cenizas de biosólido de PTAR como llenante mineral en la elaboración de mezclas asfálticas tipo MDC-19.

Abstract

Residuals water treatment plants (PTAR) and its different processes of purification generate a great quantity of residual material known as mud, which in some cases is submitted to a secondary process of treatment, modifying its properties and turning it in to biosolids. This investigation evaluates an alternative valuation for the biosolid using it as partial or total substitute of the filler in the elaboration of asphalt mixtures type HDM 19. To accomplish the purpose of the project it develops 4 phases inside the process of investigation: Compilation and characterization of the raw materials; Design of mixture for HDM 19; (Determination of the ideal content of asphalt) and the filler substitution for the biosolid ash in percent of (0%, 25%, 50%, 75%, 100%). For the characterization of the attachés, laboratory test programs were realized as granulometry, specific gravity, absorption, resistance to the wear, equivalent of sand and index of stretching and levelling; in order to determine if they were fulfilling with the minimal values demanded by the norm INVIAS. An ideal content of asphalt was defined in the mixture elaborating 3 briquettes for 5 different asphalt percentages (4.5, 5.0, 5.5, 6.0, and 6.5 %), 15 in total. The percentage was selected in base of the results obtained in properties as: flow and stability, specific weight and emptinesses percentage. The realized tests results proofs as ideal percentage of asphalt 4.6 % given the criteria for the design of asphalt mixtures from the INV. Art.450 – 13 norm, for a level of traffic 2 in cap of tread. Once defined the ideal content of asphalt, manometers were elaborated by 5 proposed replacement percentages (filler - biosolid); which determined flow and stability, specific weight and the emptinesses percentage. The project developed to laboratory level in order to determine the best relation (filler - biosólid).