Walther, Clemens

Diploma Thesis:
2075

Topic:
Spectral analysis of the hardening behaviour of different concrete compositions

Editor:
Clemens Walther

University Professor Responsible:
Univ.-Prof. Dr.-Ing. Dipl.-Wirt.-Ing. Jens Otto

Supervisor:
University Supervisor: Dipl.-Ing. (BA) Robert Jahn, M.Sc.

Editing Period:
02.12.2025 until 07.04.2026

Abstract: 
This thesis investigates the non-destructive monitoring of the early hydration stages of concrete using an innovative camera-based spectral measurement system. The aim of the thesis is to record temporal changes in the intensity of diffusely reflected light in the visible spectral range and to correlate these with the development of mechanical strength, which was determined in parallel by penetration tests. The experimental investigations on LC3 and CFM binder systems show that the optical signals reflect characteristic microstructural processes. Whilst no direct quantitative relationship between light intensity and yield strength was demonstrated, the method nevertheless allows for the detection of hydration phase transitions on a system-specific basis. This results in high application potential for real-time process monitoring in 3D concrete printing, to reliably ensure the buildability and dimensional stability of layer-by-layer applied structures.