Influence of binder characteristics on the setting and hardening of hemp lightweight concrete

Hemp concrete is an alternative building material used for insulation in low energy constructions. Experiments conducted with pure cement have generally led to poor binding properties, hence, commercial binders are often composed of a mix of hydraulic binder with lime. However, empirical observations in laboratories or onsite indicate that setting problems still may occur. This paper attempts to identify the phenomena that can explain the properties of mixed binders. With regard to hydration and mechanical performances, the results show that the addition of lime, especially fine lime, can reduce detrimental effects of hemp, but does not fully suppress them.