Problem Statement

When concrete is poured into a high formwork, the lateral pressure in the formwork can become too high, depending on factors such as the concrete mix used and the concrete temperature. This can lead to damage to the formwork and the structure and may create safety risks for personnel on the construction site. To prevent this, the pressure of the concrete in the formwork is measured. Important parameters in this context are the “beginning and end of setting time.” To date, there is no practically applicable method to determine these moments quickly and accurately on the construction site.

The central problem statement is therefore: how can the moment of “beginning and end of setting” be determined easily and accurately on the construction site?

Research Objective

The objective of this study is to demonstrate that, using temperature and electrical conductivity measurements via the ConSensor, the “beginning and end of setting time” can be determined accurately and practically on the construction site.

Literature shows that electrical conductivity, and in particular its derivative (dG/dt), provides an accurate indication of, among other things, the times of initial and final

setting. In these studies, conductivity measurements and their derivatives were compared with measurements of the stiffening of cement paste using a Vicat apparatus.

Thesis Project Description (PDF-Datei) (wird in neuem Tab geöffnet)

Published Work on the Topic

Kerndaten