Abstract

CARDONA-MONCADA, Victor Hugo; LOPEZ-LARA, Teresa; HORTA-RANGEL, Jaime Moisés  and  HERNANDEZ-ZARAGOZA, Juan Bosco. Stability and flow in an asphalt mix with partial substitution in the stone aggregate by volcanic tuff waste. Ing. invest. y tecnol. [online]. 2023, vol.24, n.1, e1977.  Epub May 25, 2023. ISSN 2594-0732.  https://doi.org/10.22201/fi.25940732e.2023.24.1.003.

Volcanic tuff wastes are stone aggregates generated by cutting and carving processes in the material banks, which, when partially replaced in the granulometry of an asphalt mixture become sustainable aggregates, so the present research aims to reduce the use of basaltic stone aggregate in an asphalt mixture maintaining the limit values of stability and flow. A Marshall design was carried out to evaluate the volumetry, stability and flow, making 36 samples (pill) by substituting 0, 10 and 20 % of basaltic stone aggregate for volcanic tuff waste. The results showed that the content of air voids (VA) increased as more volcanic tuff waste was added, and the flow decreased because the volcanic tuff had a greater capacity to absorb asphalt in the granulometry with 10 and 20 % waste of volcanic tuff. The foregoing caused the surface layer of asphalt that covers the aggregate particles to become thinner and the contact between them to be greater, therefore, when the partial substitution was 10 %, the stability increased in comparison to the control sample (0 % substitution), on the other hand, with 20 % it began to decrease because the abrasion resistance of the tuff was 28.26 %. Finally, it was obtained that the optimum asphalt content for 0 % substitution was 4.55 %, for 10 % substitution 4.63 % and for 20 % substitution 4.83 %, this reflected that a higher asphalt content is required when adds the partial substitution of volcanic tuff waste, however, the asphalt increase of 0.08 and 0.28 % was minimal with respect to the optimal asphalt content of the control mix. Therefore, the partial substitution with volcanic tuff waste with better results was 10 %, this substitution generated greater stability and less flow with respect to the control sample, these being more favorable results than just keeping them the same as the control sample as mentioned by the objective.

Keywords : Volcanic tuff; waste; partial substitution; stability; flow; asphalt mixture; Marshall design.

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