Synergistic effect of RHA and FCW in alkali-aggregate reaction mitigation
Pozzolans rich in silica, such as Rice Husk Ash (RHA), contribute to compressive strength gain but at the same time might increase alkali-aggregate reaction (AAR) in mortar mixtures. Pozzolans that have aluminates, such as Fired Clay Brick Waste (FCW), can be efficient to mitigate AAR but tend to le...
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ANTAC - Associação Nacional de Tecnologia do Ambiente Construído
2019
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| Online Erişim: | https://seer.ufrgs.br/ambienteconstruido/article/view/78869 |
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ojs-article-788692019-03-12T22:02:51Z Synergistic effect of RHA and FCW in alkali-aggregate reaction mitigation Guillante, Patrícia Abreu, Aguida Gomes de Kulakowski, Marlova Piva Mancio, Maurício Kazmierczak, Claudio de Souza Rice Husk Ash; Fired Clay Brick Waste; Alkali-Aggregate Reaction Pozzolans rich in silica, such as Rice Husk Ash (RHA), contribute to compressive strength gain but at the same time might increase alkali-aggregate reaction (AAR) in mortar mixtures. Pozzolans that have aluminates, such as Fired Clay Brick Waste (FCW), can be efficient to mitigate AAR but tend to lead to a slower compressive strength development. The association of different types of pozzolans, however, may result in a synergistic effect, compensating individual deficiencies. This paper presents a study of mixtures containing RHA, FCW and these two materials combined, aiming to obtain benefits in the mechanical behavior and in the durability regarding AAR. A substitution rate of 20% Portland cement by pozzolanic material was used. Through accelerated AAR tests and compressive strength measurements, it was found that while RHA is considered harmful to AAR – even when using an innocuous aggregate – FCW presents benefits, also avoiding this deleterious effect when combined with RHA. The same occurs in the compressive strength development, where RHA compensates a small loss of compressive strength associated with the use of FWC alone. ANTAC - Associação Nacional de Tecnologia do Ambiente Construído CAPES FAPERGS 2019-03-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion https://seer.ufrgs.br/ambienteconstruido/article/view/78869 Ambiente Construído; v. 19, n. 2 (2019): Edição Especial sobre Resíduos como Materiais de Construção; 7-20 Ambiente Construído; v. 19, n. 2 (2019): Edição Especial sobre Resíduos como Materiais de Construção; 7-20 Ambiente Construído; v. 19, n. 2 (2019): Edição Especial sobre Resíduos como Materiais de Construção; 7-20 1678-8621 1415-8876 eng https://seer.ufrgs.br/ambienteconstruido/article/view/78869/52271 Direitos autorais 2019 Ambiente Construído https://creativecommons.org/licenses/by/4.0 |
| institution |
Universidade Federal do Rio Grande do Sul |
| collection |
OJS |
| language |
eng |
| format |
Online |
| author |
Guillante, Patrícia Abreu, Aguida Gomes de Kulakowski, Marlova Piva Mancio, Maurício Kazmierczak, Claudio de Souza |
| spellingShingle |
Guillante, Patrícia Abreu, Aguida Gomes de Kulakowski, Marlova Piva Mancio, Maurício Kazmierczak, Claudio de Souza Synergistic effect of RHA and FCW in alkali-aggregate reaction mitigation |
| author_facet |
Guillante, Patrícia Abreu, Aguida Gomes de Kulakowski, Marlova Piva Mancio, Maurício Kazmierczak, Claudio de Souza |
| author_sort |
Guillante, Patrícia |
| title |
Synergistic effect of RHA and FCW in alkali-aggregate reaction mitigation |
| title_short |
Synergistic effect of RHA and FCW in alkali-aggregate reaction mitigation |
| title_full |
Synergistic effect of RHA and FCW in alkali-aggregate reaction mitigation |
| title_fullStr |
Synergistic effect of RHA and FCW in alkali-aggregate reaction mitigation |
| title_full_unstemmed |
Synergistic effect of RHA and FCW in alkali-aggregate reaction mitigation |
| title_sort |
synergistic effect of rha and fcw in alkali-aggregate reaction mitigation |
| description |
Pozzolans rich in silica, such as Rice Husk Ash (RHA), contribute to compressive strength gain but at the same time might increase alkali-aggregate reaction (AAR) in mortar mixtures. Pozzolans that have aluminates, such as Fired Clay Brick Waste (FCW), can be efficient to mitigate AAR but tend to lead to a slower compressive strength development. The association of different types of pozzolans, however, may result in a synergistic effect, compensating individual deficiencies. This paper presents a study of mixtures containing RHA, FCW and these two materials combined, aiming to obtain benefits in the mechanical behavior and in the durability regarding AAR. A substitution rate of 20% Portland cement by pozzolanic material was used. Through accelerated AAR tests and compressive strength measurements, it was found that while RHA is considered harmful to AAR – even when using an innocuous aggregate – FCW presents benefits, also avoiding this deleterious effect when combined with RHA. The same occurs in the compressive strength development, where RHA compensates a small loss of compressive strength associated with the use of FWC alone. |
| publisher |
ANTAC - Associação Nacional de Tecnologia do Ambiente Construído |
| publishDate |
2019 |
| url |
https://seer.ufrgs.br/ambienteconstruido/article/view/78869 |
| work_keys_str_mv |
AT guillantepatricia synergisticeffectofrhaandfcwinalkaliaggregatereactionmitigation AT abreuaguidagomesde synergisticeffectofrhaandfcwinalkaliaggregatereactionmitigation AT kulakowskimarlovapiva synergisticeffectofrhaandfcwinalkaliaggregatereactionmitigation AT manciomauricio synergisticeffectofrhaandfcwinalkaliaggregatereactionmitigation AT kazmierczakclaudiodesouza synergisticeffectofrhaandfcwinalkaliaggregatereactionmitigation |
| _version_ |
1709370532367958016 |