Properties and Durability Performance of Lightweight Fly Ash Based Geopolymer Composites Incorporating Expanded Polystyrene and Expanded Perlite

In this study, the use of expanded polystyrene and perlite as lightweight aggregates for preparation geopolymers is tested. The geopolymers’ performance was evaluated through physical, mechanical thermal testing. Polypropylene fibers were used reinforcement agents, while long-term durability assessed though repeated wet–dry freeze–thaw cycles sorptivity tests. results showed that introduction in geopolymer mixes decreased compressive flexural strength specimens by 77% 35%, respectively. However, density conductivity substantially improved because addition low-density aggregates. fiber samples led to a drastic increase 65%, leaving unaffected specimens. tests also after both fibers. Lightweight composites exhibiting range 1.0–1.6 g/cm3, 10–33 MPa, 1.8–6.3 0.29–0.42 W/mK, 0.031–0.056 mm/min0.5 prepared.