Evaluate the influence of starch on earth/hemp or flax straws mixtures properties in presence of superplasticizer. (20th October 2018)

• Record Type: Journal Article
• Authors: Alhaik, Ghaith; Dubois, Vincent; Wirquin, Eric; Leblanc, Alexandre; Aouad, Georges
• Is Part Of: Construction & building materials. Volume 186(2018)
• Page Start: 762
• Page End: 772
• Publication Date: 2018-10-20
• Subjects: Starch -- Earth/straw blocks -- Mechanical performances; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2018.07.209
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: This work present the influence of starch on Earth/plante mixture in its fresh and hardened state. The added starch increase the water demand and increases mechanical strengths in present of superplasticizer. The studied earth/plante blocks is designed for the production of non-bearing blocks. Several studied blocks give mechanical characteristics satisfying the EN 12859 standard. Abstract: In this paper, we study the influence of two types of starch on earth hemp or flax straw mixtures at fresh and hardened states. The main goal is to propose new non-load bearing earthen for indoor. The mass percentage of starch/binder (S/B) in mixtures was fixed at 1% of mass. The VEBE consistometer test has been used to fix a similar consistency between mixtures. The targeted workability has to allow an easy introduction of materials in the moulds. Adding both of starch has shown a positive effect on mixtures workability at the fresh state and mechanical resistances at the hardened state. At hardened state, mechanical and thermal-acoustic performances have been measured on laboratory samples and blocks at real scale. Results have shown a significant effect of starch on mechanical strengths.