Enhance the rheological and mechanical properties of clayey materials by adding starches. (15th May 2017)

• Record Type: Journal Article
• Authors: Alhaik, Ghaith; Ferreira, Michel; Dubois, Vincent; Wirquin, Eric; Tilloy, Sébastien; Monflier, Eric; Aouad, Georges
• Is Part Of: Construction & building materials. Volume 139(2017)
• Page Start: 602
• Page End: 610
• Publication Date: 2017-05-15
• Subjects: Clayey material -- Starch -- Rheological properties -- Mechanical behavior; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2016.11.130
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: The performances of clay/starch mixes are shown for their fresh and hardened state. The choice of the optimal paste is based on the flow test. The starch increases both of the water demand and the mechanical strengths. The starch changes the rheological behavior of clayey materials. Abstract: This research work highlights the rheological and mechanical behavior of clayey/starch mixes. Several native and derivate starches have been studied in association with two types of clayey materials: quarry fines and kaolinite. The mixes were manufactured with a constant starch/clayey material ratio of 1%. The optimal water content has been determinate by the flow test. The rheological and mechanical tests have shown a significant effect of starch on the properties of mixes. In the rheological part, most starches have induced an increase up to four times the thixotropic index for quarry fines, while a decrease of this parameter has been observed with the kaolinite. From a mechanical point of view, all starches increase mechanical strengths whatever the clayey material.