Title: Impact of the Type of Binder on the Properties of Deep Soil Mixing Materials

Author(s): Clément Bideux, Javad Eslami, Anne-Lise Beaucour, Albert Noumowe, Fabrice Mathieu, and Philippe Gotteland

Publication: Symposium Paper

Volume: 362

Issue:

Appears on pages(s): 794-812

Keywords: clayey soil, deep soil mixing, GGBS, low-carbon binders, mechanical properties, microstructure, soilmix materials

DOI: 10.14359/51742010

Date: 6/17/2024

Abstract:
Deep soil mixing involves mixing the soil in place with a binder to form columns or panels. Despite their importance, our knowledge of soil/binder interactions and the various hydration products remains relatively poor. Here, a multi-scale approach has been used to identify the impact of a binder's composition on its interactions with the soil. On one hand, the physical (porosity, density) and mechanical properties (compressive strength, dynamic elastic modulus) are assessed from soil mix material made with five different binders. On the other hand, the microstructure with MIP (mercury intrusion porosimetry) of soil mix material was analyzed and coupled with a mineralogical and chemical approach. This study revealed a partial incompatibility between clinker-rich binders and the clay present in the soil. Binders with latent hydraulicity exhibit better performance, as indicated by their mechanical properties. Electron microscopy also revealed microstructures with different pore size distributions, and the results of XPS and FTIR (X-ray Photoelectron Spectroscopy and Fourier-Transform InfraRed spectroscopy) analysis showed changes in the nature of the bonds.