Patent ID: 6913644
Filing Date: 2005-07-05
Classification: C04B,Y02P,Y02W

Abstract:
1. A formulation for concretes and mortars, comprising (a) a hydrophilic component selected from the group consisting of hemp, flax and straw; (b) a binder comprising lime which sets in air through absorption of carbon dioxide after reduction in an aqueous phase, (c) at least one additive which results in the formation of a microcapillary system array which comprises open and/or closed tubular capillaries, closed microspaces, closed microcavities and/or closed tubes suitable in arrangement and in proportion and distribution for ensuring that any matrix water can be evacuated to a surface on setting and then drying, while, after drying, water cannot penetrate said microcapillary system array, wherein said additive is selected from the group consisting of one or more plant colloids, mineral colloids, etherified galactomannan, and etherified derivatives of guars, and (d) at least one matrix water repellency additive which prevents said hydrophilic component from reabsorbing water after drying.