Thomas Modise, Geonano Technologies
PAPER
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Abstract
Slurries are used in South Africa as overlays, thin texture treatments, for rut filling, and within the structure of Cape seals and slurry bound macadam seals. It is considered a low-risk application and ideal for labour intensive projects. However low binder film thickness, resulting in a poor ability to retard crack reflection, and initial permeability often result in slurries not being selected as surface treatments.
The use of anionic organofunctional New-age Modified Emulsions (NME), without the addition of cement, to improve marginal road building material is considered highly successful. Treatment with properly formulated and scientifically designed modified emulsions results in significant Unconfined Compressive Strength (UCS) and Indirect Tensile Strength (ITS) being obtained and improves compact ability (ease of densification) and water proofing.
Following a successful field trial with an anionic organofunctional silane modified emulsion slurry (with no cement filler), a project was initiated to compare the properties with conventional slurry. The introduction of ITS and permeability testing in the slurry design process proved to be a significant advancement.
This paper discusses the process followed and results obtained comparing the properties of conventional and modified emulsion slurries, as well as a recommended protocol for future slurry designs.
