The feasibility of using natural rice husk ash in structural concrete. Part I: mechanical properties and microstructure
Rice husk needs to be burnt at controlled temperatures and be ground to increase its pozzolanic reactivity, in order to be used in structural concrete. This article examines the use of natural and residual rice husk ash (RHA) burnt without temperature control and without grinding, aiming to simplify...
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ANTAC - Associação Nacional de Tecnologia do Ambiente Construído
2010
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| Sarrera elektronikoa: | https://seer.ufrgs.br/ambienteconstruido/article/view/9473 |
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ojs-article-94732010-06-09T12:14:48Z The feasibility of using natural rice husk ash in structural concrete. Part I: mechanical properties and microstructure Viabilidade do emprego de cinza de casca de arroz natural em concreto estrutural. Parte I: propriedades mecânicas e microestrutura Isaia, Geraldo Cechella Guerra Gastaldini, Antonio Luiz Meira, Leticia Duart, Marcelo Zerbino, Raul Ash; Rice husk; Mechanical propertie; Microstructure Cinza. Casca de arroz. Propriedades mecânicas. Microestrutura. Rice husk needs to be burnt at controlled temperatures and be ground to increase its pozzolanic reactivity, in order to be used in structural concrete. This article examines the use of natural and residual rice husk ash (RHA) burnt without temperature control and without grinding, aiming to simplify the processing of rice husk ash and increase its use in conventional concretes, closed to the location where RHA is produced. This study investigated the order in which materials are added to the mixture and at mixing times so as to obtain better self-grinding performance inside of the drum. Reference concrete mixtures with Portland cement and with 15% and 25% cement mass replacement by natural and ground RHA were tested. The following tests were performed: axial compression strength, tensile strength by diametral compression, elasticity modulus determination, total shrinkage, mercury intrusion porosimetry, chemically combined water and SEM. The analysis of the results indicates the feasibility of replacing 15% cement by natural RHA, without significant loss of tensile strength and elasticity modulus at 28 days, with total recovery at 91 days for concretes with compression strength between 25 and 40 MPa. A casca de arroz, para ser utilizada em concreto estrutural, necessita de queima com temperatura controlada e de moagem prévia para lhe conferir maior reatividade pozolânica. Este trabalho discute o emprego da cinza de casca de arroz (CCA) natural e residual, queimada sem controle de temperatura e sem moagem, de forma a simplificar o processamento da CCA e ampliar seu uso em concretos convencionais, em locais próximos onde é produzido, Estudou-se a sequência de colocação e o tempo de mistura dos materiais na betoneira, para obtenção do melhor desempenho da automoagem no tambor. Foram testadas misturas de concreto de referência com cimento Portland e com 15% e 25% de substituição de cimento, em massa, por CCA natural e moída. Foram realizados ensaios de resistência à compressão axial, tração por compressão diametral, módulo de elasticidade, retração total, porosimetria por intrusão de mercúrio, água quimicamente combinada e MEV. A análise dos resultados revela a viabilidade da substituição de 15% de cimento por CCA natural, com perda não significativa de resistência à tração e módulo de elasticidade a 28 dias, com recuperação total a 91 dias, para concretos com resistências à compressão entre 25 MPa e 40 MPa. ANTAC - Associação Nacional de Tecnologia do Ambiente Construído CNPq, CAPES, FAPERGS, UFSM 2010-01-25 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://seer.ufrgs.br/ambienteconstruido/article/view/9473 Ambiente Construído; v. 10, n. 1 (2010); 121-137 Ambiente Construído; v. 10, n. 1 (2010); 121-137 Ambiente Construído; v. 10, n. 1 (2010); 121-137 1678-8621 1415-8876 por https://seer.ufrgs.br/ambienteconstruido/article/view/9473/7439 Direitos autorais 2016 Ambiente Construído https://creativecommons.org/licenses/by/4.0 |
| institution |
Universidade Federal do Rio Grande do Sul |
| collection |
OJS |
| language |
por |
| format |
Online |
| author |
Isaia, Geraldo Cechella Guerra Gastaldini, Antonio Luiz Meira, Leticia Duart, Marcelo Zerbino, Raul |
| spellingShingle |
Isaia, Geraldo Cechella Guerra Gastaldini, Antonio Luiz Meira, Leticia Duart, Marcelo Zerbino, Raul The feasibility of using natural rice husk ash in structural concrete. Part I: mechanical properties and microstructure |
| author_facet |
Isaia, Geraldo Cechella Guerra Gastaldini, Antonio Luiz Meira, Leticia Duart, Marcelo Zerbino, Raul |
| author_sort |
Isaia, Geraldo Cechella |
| title |
The feasibility of using natural rice husk ash in structural concrete. Part I: mechanical properties and microstructure |
| title_short |
The feasibility of using natural rice husk ash in structural concrete. Part I: mechanical properties and microstructure |
| title_full |
The feasibility of using natural rice husk ash in structural concrete. Part I: mechanical properties and microstructure |
| title_fullStr |
The feasibility of using natural rice husk ash in structural concrete. Part I: mechanical properties and microstructure |
| title_full_unstemmed |
The feasibility of using natural rice husk ash in structural concrete. Part I: mechanical properties and microstructure |
| title_sort |
feasibility of using natural rice husk ash in structural concrete. part i: mechanical properties and microstructure |
| description |
Rice husk needs to be burnt at controlled temperatures and be ground to increase its pozzolanic reactivity, in order to be used in structural concrete. This article examines the use of natural and residual rice husk ash (RHA) burnt without temperature control and without grinding, aiming to simplify the processing of rice husk ash and increase its use in conventional concretes, closed to the location where RHA is produced. This study investigated the order in which materials are added to the mixture and at mixing times so as to obtain better self-grinding performance inside of the drum. Reference concrete mixtures with Portland cement and with 15% and 25% cement mass replacement by natural and ground RHA were tested. The following tests were performed: axial compression strength, tensile strength by diametral compression, elasticity modulus determination, total shrinkage, mercury intrusion porosimetry, chemically combined water and SEM. The analysis of the results indicates the feasibility of replacing 15% cement by natural RHA, without significant loss of tensile strength and elasticity modulus at 28 days, with total recovery at 91 days for concretes with compression strength between 25 and 40 MPa. |
| publisher |
ANTAC - Associação Nacional de Tecnologia do Ambiente Construído |
| publishDate |
2010 |
| url |
https://seer.ufrgs.br/ambienteconstruido/article/view/9473 |
| work_keys_str_mv |
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| _version_ |
1709370559125520384 |