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Abstract
Different structural lightweight concrete mixtures of specific density and strength classes were produced by using various lightweight aggregates (LWAs) such as pumice, perlite, and rice husk ash. Their properties were evaluated in fresh and hardened states with regards to compressive strength and durability parameters such as water absorption (open porosity and capillary absorption), chloride’s penetration resistance, and carbonation depth. According to the results, most LWA concrete mixtures performed satisfactorily in terms of the designed strength and density and they could be used as structural LWA concrete mixtures. As far as the durability of LWA concrete was concerned, open porosity and resistance to the carbonation of LWA concrete were burdened with the porous nature of LWAs, while sorptivity in some mixtures and especially chlorides’ penetration resistance in all mixtures were reported to be significantly improved. The overall strength and durability performance of the designed LWA concrete mixtures could mitigate the concerns stemming from its vulnerability to extreme exposure conditions.
Highlights
Concrete is one of the most important levers of development for contemporary society and often its consumption level constitutes an index of development rate
This paper presents the results of strength and durability tests performed on lightweight concrete incorporating pumice, perlite, expanded perlite, and rice husk ash in different percentages
Most of the designed lightweight concrete (LWC) were successfully classified to the designed density category D1.6, while the strength values for 3 of the 6 mixtures were found to be capable of satisfying both the strength (LC28/30) and density (D1.6) categories
Summary
Concrete is one of the most important levers of development for contemporary society and often its consumption level constitutes an index of development rate. Additional research into the durability of LWC containing pumice as aggregates will provide constructive enrichment on the strength and durability characteristics of pumice concrete [16] Perlite is another natural lightweight aggregate that is widely used in LWC, mainly in its expanded form. This study investigated the potential use of alternative raw materials as aggregates in the production of structural lightweight concrete of specified strength and density classes, such as minimum strength class LC28/30 and maximum density class D1.6, respectively. Their usage is expected to contribute to both the rational usage of raw materials and the exploitation of industrial wastes— endorsing sustainability. They are expected to illustrate the role of LWAs in the strength development and durability of concrete
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