| Texto completo | |
| Autor(es): |
Damineli, Bruno L.
[1]
;
Quattrone, Marco
[1]
;
Angulo, Sergio C.
[1]
;
Taqueda, Maria Elena S.
[2]
;
John, Vanderley M.
[1]
Número total de Autores: 5
|
| Afiliação do(s) autor(es): | [1] Univ Sao Paulo, Dept Construct Engn, Escola Politecn, BR-05508900 Sao Paulo - Brazil
[2] Univ Sao Paulo, Dept Chem Engn, Escola Politecn, BR-05508900 Sao Paulo - Brazil
Número total de Afiliações: 2
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Materials and Structures; v. 49, n. 10, p. 4069-4084, OCT 2016. |
| Citações Web of Science: | 3 |
| Resumo | |
The quality control of aggregates for concrete involves determining their water absorption and apparent density, indicators of the material's porosity. The standard methods were developed for natural aggregates and are less appropriate for construction and demolition waste recycled aggregates (RAs), which have greater porosity and variability. This paper presents a rapid and accurate method to measure water absorption of RAs, combining 0.5 h vacuum saturation with similar to 2 h microwave oven drying kinetics. The new method anticipates the results by 43.5 h in comparison of standard ASTM C127, making it appealing for quality control operations. Statistical analysis shows new method gives statistically equivalent results for porous recycled aggregates but it over estimates low porosity natural aggregates. Results of the proposed method are different less than 0.5 % of those obtained by standard methods when testing three RAs with absorptions varying between 5 and 19 %. Operator did not influence the results of the new method. Details of the new experimental procedure and equipment developed are given. Suggestions for further improvement of the new method presented. (AU) | |
| Processo FAPESP: | 13/03688-3 - Influência das características físico-químicas de fillers calcários na eficiência de dispersão de suspensões cimentícias |
| Beneficiário: | Bruno Luís Daminelli |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 12/25496-6 - Estratégias para a formulação ecoeficiente de concretos secos com agregados reciclados |
| Beneficiário: | Sérgio Cirelli Angulo |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 12/15195-9 - Melhoria do desempenho de agregados reciclados mistos de RCD por tratamento térmico e superficial |
| Beneficiário: | Marco Quattrone |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |