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Shrinkage and shrinkage compensation in binders containing calcium aluminate cement
Mortars for special applications, such as grouting mortars, self-levelling underlayments or even tile adhesives will show an improved performance if their shrinkage can be kept at a low level. Therefore there exists a clear need for shrinkage compensation. This shrinkage compensation can be achieved through an expansion mechanism occurring at an early stage of hydration in the mortar. The expansion will at be overcome later ages by drying shrinkage. The mechanism of early expansion is in many cases caused by a targeted and controlled ettringite formation. This paper discusses first methods to measure shrinkage and expansion at very early ages of the mortar. The German classical method of 'Schwindrinne' or 'shrinkage channel' serves as the basic test. Improvements to this basic test are shown and discussed. Parameters such as repeatability, sample size and environment are investigated. The influence of different binder systems upon the shrinkage behaviour is demonstrated. The measurements were started as early as 5 minutes after gauging and continued as a classical drying shrinkage measurement until 28 days and for some, measurements continued up to 150 days. The results are discussed with respect to binder composition, water-cement-ratio, influence of admixtures, etc.
Shrinkage and shrinkage compensation in binders containing calcium aluminate cement
Mortars for special applications, such as grouting mortars, self-levelling underlayments or even tile adhesives will show an improved performance if their shrinkage can be kept at a low level. Therefore there exists a clear need for shrinkage compensation. This shrinkage compensation can be achieved through an expansion mechanism occurring at an early stage of hydration in the mortar. The expansion will at be overcome later ages by drying shrinkage. The mechanism of early expansion is in many cases caused by a targeted and controlled ettringite formation. This paper discusses first methods to measure shrinkage and expansion at very early ages of the mortar. The German classical method of 'Schwindrinne' or 'shrinkage channel' serves as the basic test. Improvements to this basic test are shown and discussed. Parameters such as repeatability, sample size and environment are investigated. The influence of different binder systems upon the shrinkage behaviour is demonstrated. The measurements were started as early as 5 minutes after gauging and continued as a classical drying shrinkage measurement until 28 days and for some, measurements continued up to 150 days. The results are discussed with respect to binder composition, water-cement-ratio, influence of admixtures, etc.
Shrinkage and shrinkage compensation in binders containing calcium aluminate cement
Bier, T.A. (author) / Estienne, F. (author) / Amathieu, L. (author)
2001
12 Seiten, 13 Bilder, 4 Quellen
Conference paper
English
Schrumpfung , Kompensation , flüssiger Mörtel , Unterlage , Calciumaluminatbinder , Calciumaluminatzement , Expansion , Wasserabbinden von Zement , Erhärten (Zementabbinden) , Trockenschwindung , Schrumpfprüfung , Prüfverfahren , Reproduzierbarkeit , Probenaufbereitung , Umwelteinfluss , Prüfkörper , Längenmessung , Prüflänge (Testzeit)
Shrinkage and Shrinkage Compensation in Binders Containing Calcium Aluminate Cement
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