Plastic Concrete for Cut-Off Walls: a review on material behaviourÂ-PPT Presentation

PPT Presentation

Pdf Summary

The presentation reviews the material behaviour of plastic concrete used in cut-off walls. Plastic concrete combines elements of conventional concrete mix design with the high water-to-cement (w/c) ratio and bentonite content associated with single-phase diaphragm-wall compounds.<br /><br />After 28 days, compressive strength generally decreases as the w/c ratio increases. However, this relationship may not fully represent plastic concrete because it does not account for water absorbed by bentonite. Elastic modulus tends to rise with compressive strength, but reported values become more scattered at higher strengths, likely because studies use different test methods and standards.<br /><br />Under unloaded conditions, hydraulic conductivity tends to increase with the w/c ratio. The presentation highlights important gaps in current knowledge: changes in hydraulic conductivity over time have been little studied, and no quantifiable relationship between permeability and bentonite content has been established.<br /><br />Overall, the review emphasizes that plastic concrete’s mechanical and hydraulic properties depend on its mix composition, while inconsistent testing and limited research make some relationships difficult to quantify.

Keywords

plastic concrete

cut-off walls

compressive strength

water-cement ratio

bentonite content

elastic modulus

hydraulic conductivity

permeability

diaphragm wall

mix composition