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Incorporation of AlCl3 and As2O3 in composite cement systems
As part of an investigation into the consequences of adding inorganic metal salts to composite cements, based an blast furnace slag (BFS) and pulverized fuel ash (PFA), the effect an the hydration behavior of adding AlCl3 or As2O3 to the mix water of a number of cementitious systems was investigated using isothermal conduction calorimetry (ICC) and x-ray diffraction (XRD). Four cement systems were investigated; ordinary Portland cement (OPC), 3:1 BFS: OPC, 9:1 BFS:OPC and 3:1 PFA:OPC. AlCl3.7H2O and As2O3 were added to the mix water at 0.1 % and 1 % concentrations. Results from ICC indicated that the addition of As2O3 had very little effect on the setting and early hydration of any of the cements. AlCl3 however, inhibited the setting of the composite cements at the 1% addition level but accelerated the OPC at 0.1%. The expected hydration products were observed, with the additional observation of Friedel's salt in the presence of aluminium chloride additions and vaterite in both the aluminium and arsenic-containing systems after 180 days hydration.
Incorporation of AlCl3 and As2O3 in composite cement systems
As part of an investigation into the consequences of adding inorganic metal salts to composite cements, based an blast furnace slag (BFS) and pulverized fuel ash (PFA), the effect an the hydration behavior of adding AlCl3 or As2O3 to the mix water of a number of cementitious systems was investigated using isothermal conduction calorimetry (ICC) and x-ray diffraction (XRD). Four cement systems were investigated; ordinary Portland cement (OPC), 3:1 BFS: OPC, 9:1 BFS:OPC and 3:1 PFA:OPC. AlCl3.7H2O and As2O3 were added to the mix water at 0.1 % and 1 % concentrations. Results from ICC indicated that the addition of As2O3 had very little effect on the setting and early hydration of any of the cements. AlCl3 however, inhibited the setting of the composite cements at the 1% addition level but accelerated the OPC at 0.1%. The expected hydration products were observed, with the additional observation of Friedel's salt in the presence of aluminium chloride additions and vaterite in both the aluminium and arsenic-containing systems after 180 days hydration.
Incorporation of AlCl3 and As2O3 in composite cement systems
Hill, J. Sharp J.H. (author)
2004
6 Seiten, 8 Bilder, 2 Tabellen, 9 Quellen
Conference paper
English
Aluminiumchlorid , Arsenoxid , Zement , Hochofenschlacke , Einflussgröße , Flugasche , Flugaschenzement , Wasserabbinden von Zement , Kalorimetrie , adiabatische Bedingung , Röntgenbeugung , Portlandzement , Abbindung , Inhibitor (Hemmstoff) , Beschleuniger (Katalysator) , Langzeitversuch , Additiv , Atommülllagerung , radioaktiver Abfall
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