Abstract
This study is focused on the experimental investigation of compressive strength and durability properties of lightweight concrete mixtures with fine expanded glass and expanded clay aggregates using different microfillers. The paper proposes the relationships between the compressive strength and density of concrete mixtures with different proportions of the lightweight aggregates mentioned above. The performed experimental studies have revealed the tendencies of possible usage of different amounts of fine lightweight aggregates and their combinations in the production of concrete mixtures depending on the demands of practical application. Following the requirements for structural concrete subjected to environmental effects, durability properties (alkaline corrosion and freeze–thaw resistance) of the selected concrete mixtures with expanded glass aggregate were studied. The results of the experimental investigations have shown that durability of tested concrete specimens was sufficient. The study has concluded that the mixtures under consideration can be applied for the production of structural elements to which durability requirements are significant.
Highlights
Over the past few decades, the increased use of lightweight concrete for the structural elements of tall or long-span buildings has become a more and more important aspect in the modern construction industry
When concrete is used for a structural application that demands a higher compressive strength rather than a lower density, mixtures of EGA5, EGA10, and EGA20 may be used for the production of such concrete replacing expanded clay aggregate (ECA) with expanded glass aggregate (EGA) by 5, 10, and 20%, respectively
In the matrix (Figure 4b,c) reduces the number of interrelations between the ECA surfaces and the smaller-fraction EGA can affect the concrete mix in several ways: a) the reduction of friction between the larger ECA improves the flow of the mixture; b) water is distributed more uniformly in the concrete mix during the internal curing process
Summary
Over the past few decades, the increased use of lightweight concrete for the structural elements of tall or long-span buildings has become a more and more important aspect in the modern construction industry. It should be emphasized that the application of the expanded glass aggregate (EGA) in concrete is only at its initial stage Initial studies in this field have shown that the density and compressive strength of concrete after 28 days of hardening can be in the range of 1280–1490 kg/m3 and 23.3–30.2 MPa [13], respectively. The ASR problem exists in products with EGA and Portland cement, and may occur differently in concrete of different composition or density Another aspect related to the durability of LWAC is the freeze–thaw resistance. The investigation of lightweight concrete mixtures with fine expanded glass and expanded clay aggregates, as well as different microfillers such as silica fume and ground quartz sand, was carried out. The performed research is an additional step toward the development of lightweight concrete mixtures in order to increase their sustainable application in the construction industry
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