Influence of the activating solution and aggregates in the physical and mechanical properties of volcanic ash based geopolymer mortars

Nataly Calderón, María Vargas, Jonathan Joseph Almiron Baca, Asunción Bautista, Francisco Velasco, Danny Tupayachy-Quispe

Research output: Contribution to journalConference articlepeer-review

Abstract

The physical, mechanical and microstructural properties of volcanic ash based geopolymer mortars by alkaline activation (with NaOH and Na(OH) + Na2SiO3 solutions) using different aggregates (Peruvian sand and standard sand) were studied. For the synthesis of geopolymers, a liquid:solid ratio of 0.1 and an ash:sand ratio of 1:1 were selected, and 25% of sodium silicate was added to the Na(OH) solution. The samples were compacted, toughened and cured at 80°C for 48 h. The dissolution of volcanic ash particles and the formation of the geopolymeric matrix increase with Na(OH)+Na2SiO3 solution and standard sand while the local sand promotes better geopolymerization with NaOH solution. The compression strength of volcanic ash based geopolymer mortar reported values from 18.93 MPa to 23.28 MPa at 6 months of curing, which determines the use of these geopolymers as a construction material.

Original languageEnglish
Article number012003
JournalIOP Conference Series: Materials Science and Engineering
Volume1054
Issue number1
DOIs
StatePublished - 5 Feb 2021
Event4th International Conference on Building Materials and Materials Engineering, ICBMM 2020 - Barcelona, Virtual, Spain
Duration: 24 Sep 202026 Sep 2020

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