Acoustic absorption of hemp-lime construction. (30th September 2016)

• Record Type: Journal Article
• Authors: Kinnane, Oliver; Reilly, Aidan; Grimes, John; Pavia, Sara; Walker, Rosanne
• Is Part Of: Construction & building materials. Volume 122(2016)
• Page Start: 674
• Page End: 682
• Publication Date: 2016-09-30
• Subjects: Acoustic sound absorption -- Hemp lime pozzolan concrete -- Porous materials -- Sustainability; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2016.06.106
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: Acoustic properties of hemp lime concretes and renders are reported. Multiscale porosity acoustic models applied to hemp lime products are presented. Acoustic properties of hemp concrete products including GGBS and metakolin are documented. Pozzolanic binders exhibit higher absorption coefficients than cementitious binders. Application of renders reduces the sound absorption capability of hemp concrete. Abstract: Hemp-lime concrete is a sustainable alternative to standard wall construction materials. It boasts excellent hygrothermal properties in part deriving from its porous structure. This paper investigates the acoustic properties of hemp-lime concrete, using binders developed from hydrated lime and pozzolans as well as hydraulic and cementicious binders. To assess the acoustic absorption of hemp-lime walls, as they are commonly finished in practical construction, wall sections are rendered and the resulting impact on absorption is evaluated. Hemp-concretes with lime-pozzolan binders display superior acoustic properties relative to more hydraulic binders. These are diminished when rendered, as the open surface porosity is affected, however hemp-lime construction offers the potential to meet standard and guideline targets for spaces requiring acoustic treatment.