Utilization of Para Rubber Latex and Geopolymer-Stabilized Laterite as Bases and Subbases

This study explores the enhancement of laterite for road construction through the use of para rubber latex (PRL) and geopolymers, aiming to develop sustainable and efficient stabilization methods. The results highlight that incorporating fly ash (FA) up to an optimal content of 30% significantly improved the mechanical properties, achieving a peak unconfined compressive strength (qu) of 4.48 MPa. Although adding PRL decreases qu from 4.48 to 1.83 MPa after 7 days of curing, it enhances ductility by forming a film on particle surfaces, transforming the material from brittle to semiductile. The mixture with 30% FA and 10% PRL meets Thailand’s Department of Highways standards for road base layers, achieving an optimal balance of strength and flexibility. Microstructural analysis revealed the formation of sodium aluminosilicate hydrate, which contributed to strength enhancement by densifying the geopolymer matrix. These findings underscore the potential of optimizing FA and PRL proportions to create road materials that are both cost effective and environmentally friendly. The study’s approach aligns with engineering requirements while advancing sustainability in road construction practices.