The present study investigates the synergistic effects of incorporating natural alkali-treated Alfa fibers, lime, and ground granulated blast-furnace slag (GGBS) on the physical and mechanical performance of compressed earth blocks. Laboratory tests were conducted using locally sourced earth material, reinforced with two lengths of alkali-treated Alfa fiber—F1 (3–9 mm) and F2 (20–25 mm)—and stabilized with lime (4, 8%) and GGBS (4, 8, 12%). Tests included wet and dry compressive strength, capillary absorption, linear shrinkage, abrasion resistance and thermal conductivity. Results show that the incorporation of Alfa fibers, particularly when combined with lime and GGBS, significantly enhanced wet compressive strength and abrasion resistance, while the initial reduction in dry compressive strength due to fibers was effectively offset by GGBS. The combination of longer Alfa fibers (F2) with lime and GGBS provided the best overall performance, producing compressed earth blocks with superior mechanical strength, durability, and thermal efficiency.
Bouteldja et al. (2026) studied this question.