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

Rheological properties of the raw material used in the Santa Gertrudes Ceramic Cluster proceeding from the Corumbataí Formation located in the Rio Claro, SP area

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Author(s):
Ana Candida de Almeida Prado [1] ; Carolina Del Roveri [2] ; Rogers Raphael Rocha [3] ; Antenor Zanardo [4] ; Maria Margarita Torres Moreno [5] ; José Francisco Marciano Motta [6] ; Ana Paula Margarido Menegazzo [7]
Total Authors: 7
Affiliation:
[1] UNESP. IGCE. Pós-graduandos em Geologia Regional
[2] UNESP. IGCE. Pós-graduandos em Geologia Regional
[3] UNESP. IGCE. Pós-graduandos em Geologia Regional
[4] UNESP. IGCE. DPM
[5] UNESP. IGCE. DPM
[6] IPT
[7] CCB. CITEC
Total Affiliations: 7
Document type: Journal article
Source: Rem: Revista Escola de Minas; v. 60, n. 4, p. 613-620, 2007-12-00.
Abstract

Siltstones and mudstones from the Corumbataí Formation are exploted as raw material for the ceramic industries of Santa Gertrudes' Cluster. Lithotypes from three quarries (Granusso, Tute and Cruzeiro), located in the Rio Claro region - SP - Brazil, were characterized rheologically (deflocculation curve, solid critic content and aging time), representing the entire stratigraphic column of this formation. The results obtained were correlated with the mineralogical composition. The lithotypes in the lower part of the formation deflocculated very well, with small doses of deflocculant, and were generally composed of illite, feldspar, quartz, hematite, chlorite, and interstratified (chlorite together with expansive clay minerals or illite together with expansive clay minerals). The majority of the lithotypes found at the top of the formation deflocculated. However, for this to occur, a greater amount of deflocculant was necessary, in comparison to the amount used for the bottom samples. The lithotypes found at the upper part contained the same minerals as the bottom, but in addition, carbonates were found. One of the samples, collected at the top of Tute quarry showed evidences of weathering and did not deflocculate. The carbonates at the top strata and the supergenic alteration damaged the deflocculation. The maximum amount of solids in the suspension was 66% in weight for the lithotypes from the top. The test samples presented characteristics of suspension aging, however after 120 hours their viscosity was similar to that used in the tile industry. (AU)