Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • 2005-2009  (3)
Source
Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Evaluation of the Metakaolin Pozzolanic Reactivity in Cement Pastes (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 591-593 (Aug. 2008), p. 827-832 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The pozzolanic reactivity of a commercial metakaolin (MK) manufactured in Brazil, wasevaluated in pastes prepared with a type II Portland cement, when used in cement substitutiondegrees from 10 to 40 mass % by thermal analysis techniques. The reactivity during the early stagesof hydration was studied in real time from Non-Conventional Differential Thermal Analysiscurves, normalized by the effect of the specific heats of the raw materials. The total pozzolanicreactivity after 28 days of hydration was evaluated by the calcium hydroxide consumption,calculated from thermogravimetric and derivative thermogravimetric curves of the pastes, obtainedon cement oxide calcined basis. This also allows one to a more accurate determination of theuncombined and total combined water in the pastes than usual procedures. The MK pozzolanicreactivity during the early stages and after a month is proportional to the cement substitution degreein the pastes
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.591-593.827.pdf
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    X-Ray Diffraction Study of Particulate Tannery Waste Solidified in Cement (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 530-531 (Nov. 2006), p. 478-484 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The leather industry creates a large quantity of organic and inorganic wastecontaining chromium. This research examines stabilization of particulate tannery waste intype II Portland cement. Several clays, Brazilian polycationic smectite modified in laboratoryand commercial clays were used as additives with the aim of optimizing chromiumadsorption. Tannery waste was added in quantities of 10, 15 and 20% relative to cement mass.The solidification components were analyzed separately and in combination in the solidifiedmixes using X ray diffraction. The analysis showed that reactions between the waste and thecement occurred, and that the tannery waste modified the final compounds of the system.Calcium sulfate present in the waste increased ettringite formation. Chromium also reactedwith cement, since compounds with chromium and calcium were identified. Substitution ofaluminum and silicon by chromium was also observed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.530-531.478.pdf
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Hazardous Wastes Disposal: Stabilization/Solidification of Tannery Residue in the Presence of Chromium (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 498-499 (Nov. 2005), p. 697-703 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Disposal or reuse of hazardous waste is a major consideration in chemical manufacturing and processing. Waste residuals from the tannery industry can contain high levels of chromium. Considered as a hazardous waste by the Brazilian environmental laws, the chromium-containing waste requires treatment before final disposal. This paper proposes a solution for the disposal of tannery wastes, which are rich in chromium by solidification in a Portland cement matrix using combinations of sodium bentonite and organoclay admixtures. This research is part of a series of experimental studies where Brazilian sodium bentonite, and organoclay materials are used to adsorb both inorganic and organic chromium. The solidified matrix is formed by Type II Portland cement, in which the hydration process stabilizes the tannery waste. Wyoming sodium bentonite and a commercial organoclay are analyzed and compared with the Brazilian clays. X-ray Diffraction is used to characterize the samples and leaching tests are performed to analyze the chromium concentration in the extract solution. In terms of leachate tests, the stabilization by solidification with cement is a process that can be used in the treatment of tannery waste
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/11/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.498-499.697.pdf
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...