New insight on rheology of self-consolidating earth concrete (SCEC)

Self-consolidating earth concrete (SCEC) is a novel alternative to facilitate the earth-based construction. A new concrete-equivalent mortar (CEM) approach with constant excess-paste (EP) thickness was proposed to evaluate the rheological and thixotropic properties of various SCEC mixtures proportioned with different clay and superplasticizer types. The use of non-esterified polycarboxylate (NE-PC) and sodium polynaphtalene super -plasticizer types in combination with a finer clay type led to a thixotropic behavior. Mixtures made with sodium hexametaphosphate resulted in significantly high yield stress and plastic viscosity values. The rheological properties were mainly controlled by the admixture type, followed by the type and content of clay and water-to -powder ratio (W/P). Empirical models were proposed to predict the rheology of earth-based paste, CEM, and SCEC mixtures using the governing key mixture parameters, including the fineness of the powder constituents (i. e., clay, silt, and cement), water content, EP thickness, paste volume, and packing of the granular skeleton.

Automated summary

Self-consolidating earth concrete (SCEC) is a new alternative for earth-based construction. A concrete-equivalent mortar (CEM) approach with constant excess-paste (EP) thickness was proposed to evaluate the rheological and thixotropic properties of different SCEC mixtures. The use of certain superplasticizer types and clay led to thixotropic behavior, while mixtures with sodium hexametaphosphate had high yield stress and plastic viscosity values. Empirical models were developed to predict the rheology of earth-based paste, CEM, and SCEC mixtures based on key mixture parameters.