Improvement of mechanical properties of green concrete by treatment of the vegetals fibers

Characterization of flax lime and hemp lime concretes: Hygric properties and moisture buffer capacity

“…However, beside of the hemp lime concrete which has been extensively studied, various aggregates derived from plant such as straw-clay [15], flax shives [16], diss [17], a fibrous plant which grows in wild state around the Mediterranean, can be used. This study will concentrate on a sustainable and green concrete called "flax lime concrete" by combining the flax shives (which are considered as waste products) with a lime-based binder.…”

Effect of flax fibers treatments on the rheological and the mechanical behavior of a cement composite

“…Indeed, on account of their hydrophilic character [1,2], plant fibers absorb large quantities of the mixing water and consequently the consistency of the cementitious mixture is greatly reduced [3]. Moreover, the dissolution of extractables from the fiber's surface in the cement mixture disturbs the hydration of the cement and delays the initial setting time of the composite [4,5]. Several studies have discussed the incompatibility issues between plant fibers and cement matrix and have suggested different treatments to overcome these problems.…”

Effect of Straw Fiber Modification Methods on Compatibility between Straw Fibers and Cement‐Based Materials

“…is is mainly because hemicellulose and a small amount of cellulose extracts in straw fibers affected the cement setting, for pentosan in hemicellulose is hydrolyzed into glucose and other monosaccharides in water or alkaline solution. ese monosaccharides in the alkaline medium of cement are converted into glycic acid, which, together with the calcium ion of cement hydrates, produce calcium gluconate, which in turn, wraps around the cement particles, forming a shell, thus hindering the cement hydration [37,38]. e setting time of several SFCC paste with modified straw fibers is shorter than that mixed with unmodified straw fibers, among which DN2 sets the fastest, being 12.5 h. Advances in Civil Engineering is is because after the modification of Na 2 O·nSiO 2 , the amorphous silica gel generated on the surface of straw fibers can plug the pores on the fiber surface and form a hard shell on the fiber surface (see the response equation (2)), which reduces water absorption of the fibers and greatly reduces the overflow of anticoagulant components in straw fibers in the hydration process of the cement.…”