Trait du chanvre par M Marcandier

  • Auteur: Marcandier
  • ISBN:
  • Date de sortie: 1795
  • Collection:
  • Total Download: 2626
  • Total Read: 5083

Télécharger Lire


Contribution Au D veloppement de B ton de Chanvre Pr fabriqu Utilisant Un Liant Pouzzolanique Innovant

  • Auteur: The Manh Dinh
  • ISBN:
  • Date de sortie: 2014
  • Collection:
  • Total Download: 5556
  • Total Read: 3253

Télécharger Lire


This study is part of a project aiming to develop biosourced material that satisfies sustainable development in the construction area. The object of the study is to develop a new pozzolanic binder and to characterize the hempcrete fabricated from this binder and plant aggregates (hemp shives). Hemp shives are the ligneous particles extracted from hemp stem as a co-product of the process of hemp fiber extraction. The physical properties of the hemp shives, such as particle size distribution, water absorption, bulk density and thermal conductivity are assessed. The formulations of the new pozzolanic binder are based on a mix of hydraulic or slaked lime, flash metakaolin and some admixtures. The mechanical and thermal properties of the hempcrete composite are then tested. The study concludes that the new pozzolanic binder not only presents high mechanical performance from an early age but can also be considered as an eco-material. The hempcrete made of hemp shives and pozzolanic matrix will also have considerable potential as an eco-material with the new properties achieved such as a reduction of water absorption, an improvement of mechanical performance and a good capacity of thermal insulation.

Trait du chanvre

  • Auteur: M. Marcandier
  • ISBN:
  • Date de sortie: 1758
  • Collection:
  • Total Download: 3736
  • Total Read: 5884

Télécharger Lire


Nouveau trait complet de la filature m canique du lin et du chanvre Avec planches par M P Decoster

  • Auteur: Charles COQUELIN
  • ISBN:
  • Date de sortie: 1846
  • Collection:
  • Total Download: 7483
  • Total Read: 5939

Télécharger Lire


L Usage du chanvre et du khat mayirungi Kigali

  • Auteur:
  • ISBN:
  • Date de sortie: 1987*
  • Collection:
  • Total Download: 1653
  • Total Read: 6132

Télécharger Lire


Cours l mentaire de teinture sur laine soie lin chanvre et coton

  • Auteur: Jean Baptiste Vitalis
  • ISBN:
  • Date de sortie: 1827
  • Collection:
  • Total Download: 9708
  • Total Read: 1768

Télécharger Lire


Solvants pari taux et aptitude la transformation des fibres de chanvre

  • Auteur: Rahime Bag
  • ISBN:
  • Date de sortie: 2010
  • Collection:
  • Total Download: 2191
  • Total Read: 8221

Télécharger Lire


Polymer processing and characterization depend heavily on conditions in which they are handled. In plants, which are natural composite materials, the characterization of each type of compound is necessary and critical for the understanding of their physical and mechanical properties. These are usually described by the state of each polymer in the composite. This research is to study a model of natural material, woody hemp core or chenevotte that comes from a transformation process of the hemp stem and represents 70% of the plant. Currently, production in France is 18 000 t/year and is still insufficiently valued in spite of interesting features. This wood is mainly composed of cellulose (42%), lignin (20%) and hemicelluloses (25%), but also about 5% of compounds known as extractives. In the emerging field of building, promising and concrete composite application with cement matrix exist but there are still limitations arising out of a lack of mastery on woody hemp core. The contribution of fundamental knowledge on the substrate enables to remove some and to consider new applications such as in composite materials based on synthetic polymers. Studies on poplar stressed the importance of pretreatment plant that involved a plasticizing role held by extracting steps in downstream processing of wood. This thesis has aspired to verify this hypothesis on woody hemp core. To clarify the role of extractives in the cell wall, we have partially characterized and quantified after selective solvent and affinity extraction based on thermal energy. The impact of these treatments on the relaxation properties of amorphous cell wall polymers was then performed by thermal analysis (DMA-lignin and DEA-hemicelluloses). The consequences of the failure mode of substrates were then studied. And based on the characteristics of micro-and macromechanical, we have found correlations between treatment (solvent) and associated responses (extractives biochemistry, viscoelastic and mechanical behaviors). A final focus of the thesis is dedicated to the mild impregnation with hydrochloric acid at room temperature and pH 2. The removal of entities with simple extractions affects the mobility of the amorphous phase of the plant cell wall but this change does not alter significantly the failure mode of sticks of wood. However, when the ultra-structure of the organized phase (cellulose) is amended by acid (hydrolysis), the material becomes more fragile and brittle. The existence of neo-chemical defect in the material seems to mask the impact of extractives on the failure mode. In addition, a statistically established link appears between the extracted lignin, the fracture energy and the mobility of their chains when lignin is removed in sufficient quantity
DMCA - Contact