Chemical–mineralogical characterization of C&amp;D waste recycled aggregates from São Paulo, Brazil

Angulo, Sérgio Cirelli; Ulsen, Carina; John, Vanderley M.; Kahn, Henrique; Cincotto, Maria Alba

doi:10.1016/j.wasman.2008.07.009

Cited by 111 publications

(76 citation statements)

References 21 publications

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“…These silicates are mainly calcium and aluminium silicates. RA contain higher percentage of these two elements: 10.10% (Al 2 0 3 ) and 15.70% (CaO), values which are within the ranges faund by Angulo et al (2009). The most unfavourable value of S0 3 of 3.12% is presented by ceramic RA, what is equal to the amount of Sulphur (S) of 1.248.…”

Section: Recycled Aggregates Characterizationmentioning

confidence: 90%

Comparative study of three types of fine recycled aggregates from construction and demolition waste (CDW), and their use in masonry mortar fabrication

Saíz

Cortina

Martínez

et al. 2016

Journal of Cleaner Production

158

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This research aims to study feasibility of incorporation of fine fraction of recycled aggregates coming from construction and demolition waste in cement-based masonry mortar fabrication. Initially, three types of recycled aggregates: concrete, mixed and ceramic recycled aggregates, were characterized in terms of physical, mechanical and chemical properties. There were used 1 :3 and 1 :4 cement-toaggregate proportions and replacement percentages of 50%, 75% and 100% respectfully far three types of studied recycled aggregates.Physical characterization of recycled aggregates shows a continuous size distribution curve, lower density and higher absorption, what makes the usage of additive necessary to obtain appropriate consistency. Main crystalline phases shown in the X-ray diffraction analysis were: calcite, quartz and gypsum. According to the results of the dosages study, recycled mortars present poorer behaviour than mortars fabricated using natural stand, however, complying with the limits established by the standards and manufacturers. Therefore, the results of this study suggest the possibility to replace 100% of natural sand with analyzed recycled aggregates.

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Section: Recycled Aggregates Characterizationmentioning

confidence: 90%

Comparative study of three types of fine recycled aggregates from construction and demolition waste (CDW), and their use in masonry mortar fabrication

Saíz

Cortina

Martínez

et al. 2016

Journal of Cleaner Production

158

View full text Add to dashboard Cite

show abstract

“…In addition to carbonation, the composition can include a minor portion of CaCO 3 from the limestone filler used as a partial cement replacement [22]. Limestone fillers are generally added directly at the cement production plant [23].…”

Section: Minerals Of the Adhered Cement Pastementioning

confidence: 99%

Chemical and Mineralogical Characterization of Recycled Aggregates from Construction and Demolition Waste from Mexico City

et al. 2018

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Abstract:In this study, four samples of recycled aggregates from the construction and demolition waste of Mexico City were characterized in order to find innovative uses for these types of materials. Gravel and sand from a recycling plant were analyzed, as well as aggregates produced in the laboratory from demolished concrete collected from landfills. The characterization was carried out by means of XRD (X-ray Diffraction), chemical microanalysis (EDS), X-ray fluorescence (XRF), pH measurement, and sieve analysis. The minerals present in the analyzed materials were feldspars, cristobalite and pyroxene, which corresponded to the natural aggregates, as well as variable amounts of calcite, a product of the carbonation of the cement paste adhered to these aggregates, and in a smaller proportion, calcium hemicarboaluminate, rosenhanite, and tobermorite. The quality (amount of cement) of the original concrete has a great influence on the granulometry and the chemical-mineralogical composition of the aggregates, since there will be different quantities and qualities of the cement paste adhered to the aggregates depending on their size. Finally, the pH values measured in all samples fluctuated between 10.15 and 12.08, suggesting that these materials can be used in soil stabilization or in agricultural applications.

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“…A study by Brito Filho (in Junior et al (2009) observed that the average waste material on construction site in Brazil composed of; 33% concrete and mortar, 32% soil, 30% ceramics and 5% others. Similarly, (Angulo et al 2003;Angulo et al 2009) further confirmed that almost all C&D waste in Brazil come from masonry and concrete material. Gihan, Ahmed, and Andel's (2010) study in Egypt focused on minimising and controlling the incidence of material waste from its source.…”

Section: Previous Studies On Materials Wastagementioning

confidence: 78%

“…Although at the general level, Brazil has not established the quantity of construction and demolition waste that goes to landfill annually, information exist for the amount of C&D waste from major locations of the country (Angulo et al 2009;Junior et al 2009). Brazil construction industry consumes 75% of its natural resources, 44% of total energy in use and accounts for 40% of the total waste generated in the country (Saraiva et al 2012).…”

Section: Previous Studies On Materials Wastagementioning

confidence: 99%

Professionals’ views of material wastage on construction sites and cost overruns

John¹,

Itodo²

2013

OTMCJ

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It is believed that building material wastage on construction sites account for cost overruns and any improvement in building materials management on construction sites has the potential to enhance the construction industry's performance with cost-saving benefits. The purpose of this study is to identify the most wasteful building material during construction operation. It also sets out to assess the level of material wastage with various subcontracting options, the percentage contribution of material wastage to project cost overrun, identify factors contributing to material waste on building sites and to examine the relationship between subcontracting options, project cost overrun and the level of waste generated from building material. A survey research design was employed. Responses from 56 site based professionals representing 70% of the respondents were analysed using both descriptive and inferential statistics. Results indicate that the most wasteful building material during construction operation is mortar from plastering/rendering; labour-only subcontracting options have high contribution to material wastage. Furthermore, the study revealed that the average percentage contribution of building material wastage to project cost overrun is between 21-30%; Poor supervision, re-work, and poor material handling were identified as dominant factors that have high contribution to material wastage on sites. Finally, the result also shows that there is a relationship between subcontracting options, cost overrun and waste generated from building material during construction. Measures to reduce material wastage on construction sites were proposed.Improvement in building materials management on construction sites has the potential to enhance the construction industry's performance with cost-saving benefits.

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Chemical–mineralogical characterization of C&D waste recycled aggregates from São Paulo, Brazil

Cited by 111 publications

References 21 publications

Comparative study of three types of fine recycled aggregates from construction and demolition waste (CDW), and their use in masonry mortar fabrication

Comparative study of three types of fine recycled aggregates from construction and demolition waste (CDW), and their use in masonry mortar fabrication

Chemical and Mineralogical Characterization of Recycled Aggregates from Construction and Demolition Waste from Mexico City

Professionals’ views of material wastage on construction sites and cost overruns

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