Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Determination of grinding aids in Portland cement by pyrolysis gas chromatography-mass spectrometry
The pyrolysis of Portland cement followed by gas chromatography/mass spectrometry is described for the determination of chemical additives inter-ground with cement clinkers known as grinding aids. This technique, coupled with in situ derivatization using BSTFA-TMCS reagent, has been found to be readily applicable for detecting phenol, along with five glycol and alkanolamine-type compounds in cement. The recovery rate was found to be highly dependent upon the grinding process and the binding capacity of the various additives. Using a relatively short grinding process conducted at ambient temperature, most of the additives tested can be recovered at greater than 85% of their originally added concentration. However, in the case of a longer, more intense grinding procedure conducted at 105 degree C, only phenol had recovery rates greater than 50%. The formation of salts or stable complexes between the grindings aids and cations at the freshly fractured cement surfaces, is proposed as the major cause of the variable recovery rates for the various grinding aid compounds.
Determination of grinding aids in Portland cement by pyrolysis gas chromatography-mass spectrometry
The pyrolysis of Portland cement followed by gas chromatography/mass spectrometry is described for the determination of chemical additives inter-ground with cement clinkers known as grinding aids. This technique, coupled with in situ derivatization using BSTFA-TMCS reagent, has been found to be readily applicable for detecting phenol, along with five glycol and alkanolamine-type compounds in cement. The recovery rate was found to be highly dependent upon the grinding process and the binding capacity of the various additives. Using a relatively short grinding process conducted at ambient temperature, most of the additives tested can be recovered at greater than 85% of their originally added concentration. However, in the case of a longer, more intense grinding procedure conducted at 105 degree C, only phenol had recovery rates greater than 50%. The formation of salts or stable complexes between the grindings aids and cations at the freshly fractured cement surfaces, is proposed as the major cause of the variable recovery rates for the various grinding aid compounds.
Determination of grinding aids in Portland cement by pyrolysis gas chromatography-mass spectrometry
Jeknavorian, A.A. (Autor:in) / Barry, E.F. (Autor:in) / Serafin, F. (Autor:in)
Cement and Concrete Research ; 28 ; 1335-1345
1998
11 Seiten, 20 Quellen
Aufsatz (Zeitschrift)
Englisch
Determination of Grinding Aids in Portland Cement by Pyrolysis Gas Chromatography-Mass Spectrometry
| British Library Online Contents | 1998
Determination of Grinding Aids in Portland Cement by Pyrolysis Gas Chromatography-Mass Spectrometry
| Online Contents | 1998
Use of Grinding Aids for Grinding Ternary Blends Portland Cement-Calcined Clay-Limestone
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