Influence of Binder Materials on the Mechanical Properties of Plastic Concrete

Abstract

This research aims to investigate the mechanical properties of plastic concrete used in the construction of cut-off walls for the Sirikit Dam stability improvement project, specifically at Earth Dam Dike 4. The study emphasizes material properties, mechanical properties, and workability of plastic concrete, such as aggregate gradation, setting time, slump, elastic modulus, and compressive strength of concrete. The mix proportions were modified by increasing the binder content to evaluate performance and minimize construction-related impacts during ongoing works. The study found that the controlled plastic concrete mix (used in the early construction phase according to the project’s Terms of Reference - TOR) exhibited properties that were below the contractual requirements in terms of workability, compressive strength, and flexibility compared. Furthermore, improved plastic concrete mixes demonstrated enhanced properties, suggesting better overall performance. The study also proposes prototype guidelines for developing plastic concrete using alternative materials in cut-off wall construction to mitigate potential impacts on the structure in the future. This research aspires to contribute new knowledge that can be applied to the sustainable development of dam structures and water retention systems in other related projects.