Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Suitability of fumed lead blast-furnace slag as a mineral admixture for concrete
A fumed lead blast-furnace slag was evaluated for use as a supplementary cementing material for portland cement concrete. The small quantities of zinc and lead present in the slag were not generally soluble in limewater and are thus not injurious to cement hydration. This was confirmed by determining the setting time of cement/slag combinations. The slag exhibits good pozzolanic properties and complies with the mandatory physical and chemical requirements of CSA A23.5 for natural pozzolans and fly ash. The slag behaved in a similar fashion to fly ash when used in concrete in that it slightly increased the setting time, reduced water demand, reduced early-age strength (e.g. at 3 days) and increased the 28-day and 90-day strength. The slag only produced a minor reduction in the 'chloride permeability' (ASTM C 1202) of concrete when used at a replacement levels up to 30 %. However, the use of 40 % slag affected a reduction of more than 5O % compared to the control. Fly ash was considerably more effective in reducing the 'chloride permeability'.
Suitability of fumed lead blast-furnace slag as a mineral admixture for concrete
A fumed lead blast-furnace slag was evaluated for use as a supplementary cementing material for portland cement concrete. The small quantities of zinc and lead present in the slag were not generally soluble in limewater and are thus not injurious to cement hydration. This was confirmed by determining the setting time of cement/slag combinations. The slag exhibits good pozzolanic properties and complies with the mandatory physical and chemical requirements of CSA A23.5 for natural pozzolans and fly ash. The slag behaved in a similar fashion to fly ash when used in concrete in that it slightly increased the setting time, reduced water demand, reduced early-age strength (e.g. at 3 days) and increased the 28-day and 90-day strength. The slag only produced a minor reduction in the 'chloride permeability' (ASTM C 1202) of concrete when used at a replacement levels up to 30 %. However, the use of 40 % slag affected a reduction of more than 5O % compared to the control. Fly ash was considerably more effective in reducing the 'chloride permeability'.
Suitability of fumed lead blast-furnace slag as a mineral admixture for concrete
Thomas, D.L. (Autor:in) / Thomas, M.D.A. (Autor:in) / Ryell, J. (Autor:in)
1998
16 Seiten, 1 Bild, 4 Tabellen, 5 Quellen
Aufsatz (Konferenz)
Englisch
Blei , Laborversuch , Puzzolanzement , Röntgenbeugung , chemische Analyse , amorpher Stoff , Mahlfeinheit , Granulat , Beton , Erhärten (Zementabbinden) , Wasserabbinden von Zement , hydraulisches Bindemittel , Druckfestigkeit , Dauer , Trockenschwindung , Korrosion , Chlorid , Wasser-Zement-Wert , Additiv , Abfallprodukt , Umweltschutz , Schlacke , Verunreinigung , Ersatzstoff , Entsorgung (Müll)
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