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Investigation of the mechanical and hygrothermal behavior of coffee ground wastes valorized as a building material: analysis of mix designs performance and sorption curve linearization effect

Hamdaoui Mohamed Ali, Benzaama Mohammed-Hichem, El Mendili Yassine, Chateigner Daniel, Gascoin Stéphanie

Archives of Civil and Mechanical Engineering

2023

Vol. 23, no. 1

art. no. e57, 2023

Coffee ground wastes (CGW) are by-products from the coffee-making processes. In this study, we propose to valorize them in construction materials at large scale. In particular, we investigate the mechanical and hygrothermal performances of earthen cob construction with incorporation of various amounts of CGW. Our results indicate that adding coffee grounds to cob enhances its hygrothermal performances as well as its compressive strength. An interesting enhancement of the lightened earth thermal characteristics as well as a good control of the hydric load in the air while maintaining acceptable mechanical properties is observed. Numerical analysis is used to evaluate the hygrothermal behavior of cob specimens to better understand their energy performances. A simplification of the simulation methods using a linearization of the sorption curve is incorporated to reduce calculation times and optimize outputs. The method is validated using experimental data, which shows a promising improvement compared to previous approaches. The proposed method can be faithfully applied to the study of hygrothermal behavior of biomaterials, which is strongly related to the building energy performance and the investigation of their durability in a fast and effcient way.

Biobased building materials – directions and development prospects

Wilk Katarzyna, Burawska Izabela

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

2022

No. 119

71--77

Biobased building materials – directions and development prospects. Market of building biomaterials is a dynamically developing branch of the construction sector. The design of buildings and the use of building biomaterials should take into account all factors influencing biomaterials throughout the life cycle of an engineering facility, so that the building can be characterized by high strength and durability. Many political organizations and others promote ecological houses made of building biomaterials as future-proof solutions in construction sector. Building biomaterials are a basic element of green construction, they enable safe disposal, reuse and they are a storehouse of carbon dioxide, which is emitted in the production of conventional materials. Diversified directions of development of ecological and new building materials create potential prospects for their application. The main factor that limits this development is the conservativeness of the construction industry.