Influence of Concrete Sludge Addition in the Properties of Alkali-Activated and Non-Alkali-Activated Fly Ash-Based Mortars
This study investigated the use of concrete sludge, a by-product of the ready-mix concrete industry, in combination with high-calcium fly ash in binary cementless binders. Concrete sludge was used in substitution rates ranging from 0% to 60% in test fly ash-based mortars to determine potential syner...
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| Format: | Article |
| Language: | English |
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Wiley
2021-01-01
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| Series: | Advances in Civil Engineering |
| Online Access: | http://dx.doi.org/10.1155/2021/5534002 |
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| author | Fotini Kesikidou Stavroula Konopisi Eleftherios K. Anastasiou |
| author_facet | Fotini Kesikidou Stavroula Konopisi Eleftherios K. Anastasiou |
| author_sort | Fotini Kesikidou |
| collection | DOAJ |
| description | This study investigated the use of concrete sludge, a by-product of the ready-mix concrete industry, in combination with high-calcium fly ash in binary cementless binders. Concrete sludge was used in substitution rates ranging from 0% to 60% in test fly ash-based mortars to determine potential synergy. The mortars were tested for fresh and hardened properties; workability, viscosity, strength development, open porosity, early-age shrinkage, and analytical tests were carried out. A mortar with 50% fly ash and 50% limestone filler as binders was used for comparison purposes. Furthermore, a series of mortars with fly ash and concrete sludge were alkali-activated in order to determine potential strength gain. In the activated mortars, two fractions of concrete sludge were used, under 75 μm and 200 μm, due to different silicon oxide contents, while one mortar was cured at 40°C to investigate the effect of heating on alkali activation. Results show that sludge contributes to the formation of C-S-H and strength development when used in combination with high-calcium fly ash even at high replacement rates. The alkali activation of fly ash-concrete sludge system contributed to early-age strength development and to early-age shrinkage reduction. |
| format | Article |
| id | doaj-art-60431bbbaacd478e934aa05307c9fccf |
| institution | Kabale University |
| issn | 1687-8086 1687-8094 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Civil Engineering |
| spelling | doaj-art-60431bbbaacd478e934aa05307c9fccf2025-02-03T01:29:22ZengWileyAdvances in Civil Engineering1687-80861687-80942021-01-01202110.1155/2021/55340025534002Influence of Concrete Sludge Addition in the Properties of Alkali-Activated and Non-Alkali-Activated Fly Ash-Based MortarsFotini Kesikidou0Stavroula Konopisi1Eleftherios K. Anastasiou2Laboratory of Building Materials, School of Civil Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, GreeceLaboratory of Building Materials, School of Civil Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, GreeceLaboratory of Building Materials, School of Civil Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, GreeceThis study investigated the use of concrete sludge, a by-product of the ready-mix concrete industry, in combination with high-calcium fly ash in binary cementless binders. Concrete sludge was used in substitution rates ranging from 0% to 60% in test fly ash-based mortars to determine potential synergy. The mortars were tested for fresh and hardened properties; workability, viscosity, strength development, open porosity, early-age shrinkage, and analytical tests were carried out. A mortar with 50% fly ash and 50% limestone filler as binders was used for comparison purposes. Furthermore, a series of mortars with fly ash and concrete sludge were alkali-activated in order to determine potential strength gain. In the activated mortars, two fractions of concrete sludge were used, under 75 μm and 200 μm, due to different silicon oxide contents, while one mortar was cured at 40°C to investigate the effect of heating on alkali activation. Results show that sludge contributes to the formation of C-S-H and strength development when used in combination with high-calcium fly ash even at high replacement rates. The alkali activation of fly ash-concrete sludge system contributed to early-age strength development and to early-age shrinkage reduction.http://dx.doi.org/10.1155/2021/5534002 |
| spellingShingle | Fotini Kesikidou Stavroula Konopisi Eleftherios K. Anastasiou Influence of Concrete Sludge Addition in the Properties of Alkali-Activated and Non-Alkali-Activated Fly Ash-Based Mortars Advances in Civil Engineering |
| title | Influence of Concrete Sludge Addition in the Properties of Alkali-Activated and Non-Alkali-Activated Fly Ash-Based Mortars |
| title_full | Influence of Concrete Sludge Addition in the Properties of Alkali-Activated and Non-Alkali-Activated Fly Ash-Based Mortars |
| title_fullStr | Influence of Concrete Sludge Addition in the Properties of Alkali-Activated and Non-Alkali-Activated Fly Ash-Based Mortars |
| title_full_unstemmed | Influence of Concrete Sludge Addition in the Properties of Alkali-Activated and Non-Alkali-Activated Fly Ash-Based Mortars |
| title_short | Influence of Concrete Sludge Addition in the Properties of Alkali-Activated and Non-Alkali-Activated Fly Ash-Based Mortars |
| title_sort | influence of concrete sludge addition in the properties of alkali activated and non alkali activated fly ash based mortars |
| url | http://dx.doi.org/10.1155/2021/5534002 |
| work_keys_str_mv | AT fotinikesikidou influenceofconcretesludgeadditioninthepropertiesofalkaliactivatedandnonalkaliactivatedflyashbasedmortars AT stavroulakonopisi influenceofconcretesludgeadditioninthepropertiesofalkaliactivatedandnonalkaliactivatedflyashbasedmortars AT eleftherioskanastasiou influenceofconcretesludgeadditioninthepropertiesofalkaliactivatedandnonalkaliactivatedflyashbasedmortars |