Modification of hydration of a vernacular
ettringite binder

Abstract

In this bachelor thesis the effect of modifying the hydration process of a vernacular ettringite binder on the setting time, the dimension changes and the compressive strength after 28 days is examined. The examined binder is a ternary binder consisting of trass, lime and a varying sulfate source. The modification of the hydration was executed by changing the lime content and the sulfate source of the binder as well as by admixing different dosages of sugar. In the lab, setting time measurements, compressive strength tests after 28 days, continuous dimension measurements as well as XRD-analyses were carried out in order to provide data and find correlations between the varying parameter in the binder compositions and the change in performance of stabilized earth-binder samples. The results of this thesis display trends that can be taken account of for future investigations on similar binder compositions.