Akademik Veri Yönetim Sistemi
Tezin Türü: Yüksek Lisans
Tezin Yürütüldüğü Kurum: Orta Doğu Teknik Üniversitesi, Fen Bilimleri Enstitüsü, Fen Bilimleri Enstitüsü, Türkiye
Tezin Onay Tarihi: 2014
Öğrenci: HASAN ESER
Danışman: LUTFULLAH TURANLI
Özet:Structural Lightweight Concrete is generally made by using artificial lightweight aggregates such as expanded clay, shale and slate. However, rapidly increasing fuel prices in recent decades and corresponding increase in the production costs of these aggregates have renewed the interest in natural lightweight aggregates such as pumice, scoria, rhyolite and perlite. This study investigates the mechanical properties and durability characteristics of high-performance lightweight concretes utilizing natural perlite aggregate and perlite powder in comparison to those of high-strength normal weight concrete of similar specific strength (structural efficiency). For this purpose, three concrete mixtures have been designed, namely high-strength lightweight concrete (HSLWC), self-compacting high strength lightweight concrete (SCLWC) and high-strength normal weight concrete (HSNWC). An extensive testing program was conducted on concrete specimens to determine fresh properties such as slump, slump flow, unit weight, air content and setting time; hardened properties such as compressive strength, splitting and flexural tensile strength, modulus of elasticity and thermal coefficient of expansion; durability characteristics such as rapid chloride-ion penetrability, resistance to aggressive chemical solutions and freezing-thawing resistance. The results have shown that natural perlite aggregate and perlite powder can be satisfactorily utilized in the production of self-compacting lightweight concrete with 28-day compressive strengths up to 50 MPa. It is also shown that perlite aggregate containing high performance lightweight concretes have generally superior or at least similar durability performance to that of high-strength normal weight concrete of similar specific strength.