Mechanical Evaluation of New Geopolymeric Formulations from Metakaolin (MK)/Ignimbrite (IG) Binder Mixtures for Possible Use in the Construction Industry

Huamán-Mamani F.A.; Grande-Ccalla J.C.; Morais A.I.S.; Palomino-Ñaupa C.K. · Lecture Notes in Civil Engineering (2025) · DOI: 10.1007/978-981-96-7687-3_13

Resumen

This research collects the results on the manufacture and mechanical response of new formulations for geopolymeric mortars using two types of binders (Ignimbrite and Metakaolin). This study focused on analyzing the effect on the mechanical response when Metakaolin was replaced by Ignimbrite in equivalent volumes within a mortar mixture with a binder: sand ratio of 1:3, where the binder was the mixture of Metakaolin and Ignimbrite. In parallel and, with comparative fines, conventional Portland cement mortars were manufactured and mechanically evaluated, with a binder: fine sand volumetric ratio also of 1:3. For the manufacture of geopolymeric mortars, the liquid phase was shown to be the sodium hydroxide solution with a molarity of 12. While for the conventional Portland cement mortar, water was used. In all cases, the liquid phase: binder ratio was 0.6. From the mechanical results, a systematic increase in the maximum strength and Young's modulus was found with the increase in the amount of Ignimbrite replacing Metakaolin. The highest maximum strength values were found when Ignimbrite completely replaced Metakaolin, reaching compressive strengths of up to 70 MPa (in mortars with 25 vol.% Ignimbrite and 75 vol.% fine sand) and the lowest values were found in mortars with only 5% Ignimbrite replaced with Metakaolin. Mortars with 100% Ignimbrite (70 MPa) or 100% Metakaolin (51.7 MPa) as the binder phase, presented maximum mechanical strength values higher than Portland cement mortars (47.2 MPa). © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

Instituciones: Universidad Católica San Pablo