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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Rapid method for measuring the water absorption of recycled aggregates

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Damineli, Bruno L. [1] ; Quattrone, Marco [1] ; Angulo, Sergio C. [1] ; Taqueda, Maria Elena S. [2] ; John, Vanderley M. [1]
Total Authors: 5
[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
Total Affiliations: 2
Document type: Journal article
Source: Materials and Structures; v. 49, n. 10, p. 4069-4084, OCT 2016.
Web of Science Citations: 3

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)

FAPESP's process: 13/03688-3 - Evaluation of the influence of limestone fillers properties on the behavior of dispersed CLINKER-FILLER systems
Grantee:Bruno Luís Damineli
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 12/15195-9 - Improving of recycled mixed CDW aggregates performance by means of thermal and coating treatments
Grantee:Marco Quattrone
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 12/25496-6 - Strategies for eco-efficient dry-concrete formulation with recycled aggregates
Grantee:Sérgio Cirelli Angulo
Support type: Regular Research Grants