Life cycle assessment of hemp cultivation and use of hemp-based thermal insulator materials in buildings.

The aim of this research is to assess the sustainability of a natural fiber, such as hemp (Cannabis sativa), and its use as thermal insulator for building applications. The sustainability of hemp was quantified by life cycle assessment (LCA) and particular attention was given to the amount of CO2eq of the whole process, and the indicator greenhouse gas protocol (GGP) was selected to quantify CO2eq emissions. In this study also CO2 uptake of hemp was considered. Two different allocation procedures (i.e., mass and economic) were adopted. Other indicators, such as Cumulative Energy Demand (CED) and EcoIndicator99 H were calculated. The production of 1 ha yielded 15 ton of hemp, whose global warming potential (GWP100) was equal to about -26.01 ton CO2eq: the amount allocated to the technical fiber (20% of the total amount of hemp biomass) was -5.52 ton CO2eq when mass allocation was used, and -5.54 ton CO2eq when economic allocation was applied. The sustainability for building applications was quantified by considering an insulation panel made by hemp fiber (85%) and polyester fiber (15%) in 1 m(2) of wall having a thermal transmittance (U) equal to 0.2 W/m(2)_K. The environmental performances of the hemp-based panel were compared to those of a rockwool-based one.

[1]  Florence Collet,et al.  Water vapor properties of two hemp wools manufactured with different treatments , 2011 .

[2]  H. Sixta,et al.  Acoustical properties of Lyocell, hemp, and flax composites , 2010 .

[3]  P. Krausz,et al.  Properties of cellulosic fibre reinforced plaster: influence of hemp or flax fibres on the properties of set gypsum , 2010, Journal of Materials Science.

[4]  W. Hall,et al.  A review of bast fibres and their composites. Part 2 - Composites , 2010 .

[5]  Laurent Arnaud,et al.  Acoustical properties of materials made of vegetable particles with several scales of porosity , 2011 .

[6]  A. Shahzad.  Hemp fiber and its composites – a review , 2012 .

[7]  H. V. D. Werf,et al.  The environmental impacts of the production of hemp and flax textile yarn , 2008 .

[8]  P. Glouannec,et al.  Influence of the setting process and the formulation on the drying of hemp concrete , 2012 .

[9]  T. Chotard,et al.  Mechanical properties of hemp-lime reinforced mortars: influence of the chemical treatment of fibers , 2011 .

[10]  Tiago Domingos,et al.  Industrial hemp or eucalyptus paper? , 2010 .

[11]  Laurent Serres,et al.  Porous structure and water vapour sorption of hemp-based materials , 2008 .

[12]  Jeroen B. Guinee,et al.  Handbook on life cycle assessment operational guide to the ISO standards , 2002 .

[13]  Cinzia Buratti,et al.  Life cycle assessment of biomass production: Development of a methodology to improve the environmental indicators and testing with fiber sorghum energy crop , 2010 .

[14]  S. Amziane,et al.  Design of green concrete made of plant-derived aggregates and a pumice-lime binder , 2012 .

[15]  Azra Korjenic,et al.  Development and performance evaluation of natural thermal-insulation materials composed of renewable resources , 2011 .

[16]  M. Huijbregts,et al.  Handbook on Life Cycle Assessment: Operational Guide to the ISO Standards , 2002 .

[17]  S. Pfister,et al.  Life Cycle Inventory and Carbon and Water FoodPrint of Fruits and Vegetables: Application to a Swiss Retailer , 2012, Environmental Science and Technology.

[18]  Wesley K. Whitten,et al.  Composites , 1977, Science.

[19]  Y. Scudeller,et al.  Mechanical and thermal properties of lime and hemp concrete (“hempcrete”) manufactured by a projection process , 2008 .

[20]  M. R. Sanjay,et al.  Study on Mechanical Properties of Natural - Glass Fibre Reinforced Polymer Hybrid Composites: A Review , 2015 .

[21]  Sara González-García,et al.  Comparative environmental performance of lignocellulosic ethanol from different feedstocks , 2010 .

[22]  Etienne Wurtz,et al.  Transient hygrothermal behaviour of a hemp concrete building envelope , 2010 .

[23]  Christophe Baley,et al.  Influence of compactness and hemp hurd characteristics on the mechanical properties of lime and hemp concrete , 2009 .

[24]  G. Escadeillas,et al.  Use of plant aggregates in building ecomaterials , 2012 .

[25]  Elena Fuente,et al.  Use of cellulose fibers from hemp core in fiber-cement production. Effect on flocculation, retention, drainage and product properties , 2012 .

[26]  Niels H. Batjes,et al.  Emissions of N2O and NO from fertilized fields: Summary of available measurement data , 2002 .

[27]  Colin MacDougall,et al.  Natural Building Materials in Mainstream Construction: Lessons from the U. K. , 2008 .

[28]  Julio Tijero,et al.  Characterisation of agricultural residues used as a source of fibres for fibre-cement production , 2012 .

[29]  Azra Korjenic,et al.  Performance evaluation and research of alternative thermal insulations based on sheep wool , 2012 .

[30]  Gianpietro Venturi,et al.  Hemp as a raw material for industrial applications , 2004, Euphytica.

[31]  Muhammad Pervaiz,et al.  Carbon storage potential in natural fiber composites , 2003 .

[32]  H. M. G. Werf.  Life Cycle Analysis of field production of fibre hemp, the effect of production practices on environmental impacts , 2004, Euphytica.

[33]  Maurizio Cellura,et al.  Building energy performance : A LCA case study of kenaf-fibres insulation board , 2008 .

[34]  C. Pagnoux,et al.  Mechanical properties of hemp fibre reinforced cement: Influence of the fibre/matrix interaction , 2008 .

[35]  W. Hall,et al.  A review of bast fibres and their composites. Part 1 – Fibres as reinforcements , 2010 .

[36]  Sara González-García,et al.  Life cycle assessment of raw materials for non-wood pulp mills: Hemp and flax , 2010 .

[37]  Knut-Håkan Jeppsson,et al.  Mechanical properties of lime-hemp concrete containing shives and fibres , 2009 .

[38]  A. Sjöberg,et al.  Flax and hemp fibres as raw materials for thermal insulations , 2008 .

[39]  E. Gourlay,et al.  Experimental study of parameters influencing mechanical properties of hemp concretes , 2012 .

[40]  M. Jawaid,et al.  Cellulosic/synthetic fibre reinforced polymer hybrid composites: A review , 2011 .

[41]  S. Amziane,et al.  Effect of compaction on mechanical and thermal properties of hemp concrete , 2010 .

[42]  Sara González-García,et al.  Environmental impact assessment of non-wood based pulp production by soda-anthraquinone pulping process , 2010 .