Influence of sunflower aggregates surface treatments on physical properties and adhesion with a mineral binder

A novel pull-out device used to study the influence of pressure during processing of cement-based material reinforced with coir

“…On the other hand, for rope-concrete and steel bar reinforcement, the experimental size is at least one scale higher than for fibre reinforcement. Nozahic and Amziane have developed an interfacial shear strength measurement device on a single sunflower particle during the structural build-up and hardening of a pozzolanic matrix [15]. The device measures the shear strength mobilisation at the particle interface during the hardening of the matrix, as carried out in Amziane et al [38] with a plate.…”

“…To reinforce cement-based materials with plant fibres in place of conventional fibres requires a careful analysis, as vegetal fibres absorb water [9,10] and could release extractive compounds into the fresh mix. These compounds can affect the setting time [11,12], prevent cement hydration [13,14] and therefore modify the interface area between fibre and matrix in the fresh state and during hardening [15]. Problems such as a set-retarding or an even set-inhibiting effect when mixing vegetable particles with mineral binders can create a complex Interfacial Transition Zone (ITZ) between lignocellulosic aggregates or fibres and the binder matrix.…”

Polysaccharidic binders for the conception of an insulating agro-composite

“…This result revealed that this kind of bio-based composite presents competitive mechanical properties compared with other industrial non-biobased composites such as styrofoam composite panels [55] and with other agro-composites such as hemp concrete known as a green insulator composite [15]. Furthermore, Elfordy et al, [10] have measured Young's modulus and compressive strength of hemp concrete blocks with various densities (between 291 to 481 kg.m -3 ).…”

“…However, the binder (matrix) used in the insulating biocomposites is often mainly produced from petroleum-based polymers or from mineral resource (cement) [15][16]. These binders have questionable (or undesirable) environmental impact.…”

“…Studies aimed at the development of bio-based insulating composites report that they have lower thermal conductivity, are cheaper, durable, lightweight and environmental friendly compared to conventional ones [9][10][11][12][13][14][15][16][17]. However, the binder (matrix) used in the insulating biocomposites is often mainly produced from petroleum-based polymers or from mineral resource (cement) [15][16].…”