Engineering and Technology
| Open Access |
DOI: High-Strength Lightweight Fiber-Reinforced Concrete Based on Expanded Perlite, Ceramic Brick Waste and Hybrid Fibers for Hot-Dry Climatic Conditions
Ilyasov Allanazar , Karakalpak State University, Uzbekistan Rajabov Umid , Karakalpak State University, Uzbekistan Begjanov Timur , Karakalpak State University, UzbekistanAbstract
The paper presents an experimental and analytical study of high-strength lightweight fiber-reinforced concrete designed for hot-dry climatic conditions and for the use of locally available mineral resources. The proposed composite combines CEM I 42.5N Portland cement, silica fume MK-85, limestone powder, ceramic brick waste powder, quartz sand, expanded perlite and dispersed basalt and polypropylene fibers. Expanded perlite was considered not only as a lightweight aggregate but also as a component supporting internal curing through controlled pre-wetting. Four mix variants were compared: a non-fibrous reference mixture, a basalt-fiber mixture, a polypropylene-fiber mixture and a hybrid fiber mixture. The experimental program included tests for fresh concrete workability, hardened density, compressive and flexural strength, water absorption, water tightness, frost resistance, drying shrinkage and thermal conductivity. The hybrid fiber mixture provided the most balanced result: a 28-day compressive strength of 67.9 MPa, flexural strength of 7.97 MPa, hardened density of 1512 kg/m³, shrinkage of 441 µε and thermal conductivity of 0.45 W/(m·K). Regression models confirmed a positive interaction between basalt and polypropylene fibers in strength development and an additional beneficial reduction of shrinkage and thermal conductivity. The scientific novelty consists in the combined use of local expanded perlite, ceramic brick waste and hybrid fiber reinforcement to obtain a lightweight composite with high specific strength, improved crack resistance and enhanced thermal efficiency.
Keywords
Lightweight concrete, expanded perlite, ceramic brick waste
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Copyright (c) 2026 Ilyasov Allanazar, Rajabov Umid, Begjanov Timur
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