Title:
Study of Optimized Mechanical Properties in Sustainable Geopolymer Mortar with Tire Waste
Author(s):
Rondinele A. R. Ferreira, Cristiane Pires, Leonardo S. Gratao, and Leila A. C. Motta
Publication:
Materials Journal
Volume:
122
Issue:
3
Appears on pages(s):
89-101
Keywords:
central composite design (CCD); ecological composites; geopolymer mortar; metakaolin; tire rubber (TR)
DOI:
10.14359/51746717
Date:
5/1/2025
Abstract:
The rapid growth of population, consumption, and economy stimulates the extraction of natural resources at an accelerated rate,
directly impacting the environment by generating waste and
CO2 emissions, primarily in the civil construction industry. This
research investigates the use of untreated tire waste rubber as a
replacement for fine aggregate (sand) in geopolymer mortar, in
response to environmental concerns from the civil construction
industry. The study uses a central composite design (CCD) and
response surface methodology (RSM) to optimize the modulus of
rupture (MOR), modulus of elasticity (MOE), and toughness. With
a global desirability of 0.73, the optimized values for these variables
were 2.85 MPa, 676.3 MPa, and 0.331 kJ/m2, respectively,
with experimental errors below 10%. The results suggest that tire
waste rubber can effectively replace fine aggregate in geopolymer
mortar, potentially reducing environmental impact.