Chemical-mineralogical characterization of C and D waste recycled aggregates from Sao Paulo, Brazil

Journal Article · Sun Feb 15 00:00:00 EST 2009 · Waste Management

DOI:https://doi.org/10.1016/j.wasman.2008.07.009· OSTI ID:21217137

Angulo, S.C. ^[1]; Ulsen, C. ^[2]; John, V.M. ^[3]; Kahn, H. ^[4]; Cincotto, M.A. ^[5]

---

1. Institute of Technological Research, Av. Prof. Almeida Prado No. 532, 05508-901 Sao Paulo-SP (Brazil), E-mail: [e-mail]
2. Department of Mining and Petroleum Engineering, Escola Politecnica, University of Sao Paulo (Brazil), E-mail: [e-mail]
3. Department of Construction Engineering, Escola Politecnica, University of Sao Paulo Av. Prof. Almeida Prado No. 83, 05508-900 Sao Paulo-SP (Brazil), E-mail: [e-mail]
4. Department of Mining and Petroleum Engineering, Escola Politecnica, University of Sao Paulo (Brazil), E-mail: [e-mail]
5. Department of Construction Engineering, Escola Politecnica, University of Sao Paulo Av. Prof. Almeida Prado No. 83, 05508-900 Sao Paulo-SP (Brazil), E-mail: [e-mail]

This study presents a methodology for the characterization of construction and demolition (C and D) waste recycled aggregates based on a combination of analytical techniques (X-ray fluorescence (XRF), soluble ions, semi-quantitative X-ray diffraction (XRD), thermogravimetric analysis (TGA-DTG) and hydrochloric acid (HCl) selective dissolution). These combined analytical techniques allow for the estimation of the amount of cement paste, its most important hydrated and carbonated phases, as well as the amount of clay and micas. Details of the methodology are presented here and the results of three representative C and D samples taken from the Sao Paulo region in Brazil are discussed. Chemical compositions of mixed C and D aggregate samples have mostly been influenced by particle size rather than the visual classification of C and D into red or grey and geographical origin. The amount of measured soluble salts in C and D aggregates (0.15-25.4 mm) is lower than the usual limits for mortar and concrete production. The content of porous cement paste in the C and D aggregates is around 19.3% (w/w). However, this content is significantly lower than the 43% detected for the C and D powders (<0.15 mm). The clay content of the powders was also high, potentially resulting from soil intermixed with the C and D waste, as well as poorly burnt red ceramic. Since only about 50% of the measured CaO is combined with CO{sub 2}, the powders have potential use as raw materials for the cement industry.

• OSTI ID: 21217137
• Journal Information: Waste Management, Vol. 29, Issue 2; Other Information: DOI: 10.1016/j.wasman.2008.07.009; PII: S0956-053X(08)00233-X; Copyright (c) 2008 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0956-053X
• Country of Publication: United States
• Language: English

Related Subjects

12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
BRAZIL
CARBON DIOXIDE
CEMENT INDUSTRY
CEMENTS
CERAMICS
CHEMICAL COMPOSITION
CLASSIFICATION
CLAYS
CONCRETES
DEMOLITION
FLUORESCENCE
HYDROCHLORIC ACID
MORTARS
POROUS MATERIALS
RAW MATERIALS
THERMAL GRAVIMETRIC ANALYSIS
WASTES
X-RAY DIFFRACTION
X-RAY FLUORESCENCE ANALYSIS