Author/Authors :
David Sedan، نويسنده , , Ce´cile Pagnoux، نويسنده , , Thierry Chotard، نويسنده , ,
Agne`s Smith، نويسنده , , Danielle Lejolly، نويسنده , , Vincent Gloaguen، نويسنده , , Pierre Krausz، نويسنده ,
Abstract :
Chemical reactivity of hemp fibres placed into
a cimentitous matrix was studied by using a lime solution
as a simplified cement solution. The hemp fibres contain
56.1 wt.% of cellulose, 20.1 wt.% of pectin, 10.9 wt.% of
hemicellulose and 6 wt.% of lignin. These compounds are
not solubilised in a basic medium rich in calcium but a part
located at the fibre surface should be degraded. This
treatment leads also to the decrease of the cristallinity index
of the cellulose. Calcium ions adsorb in a large
quantity onto the fibre surface due to the high concentration
of pectin. The structure of the homogalacturonic part of
pectin forms with Ca2+ a stable chelate called ‘‘egg-box’’,
supporting cation adsorption. The fibres are then covered
by Ca(OH)2 nodules after immersion in a lime solution
