Producing plant aggregates for preparation of construction material, comprises performing reactive extrusion of raw vegetable material in presence of peroxides, producing reaction mixture, and obtaining extrudate by heating the mixture

The process comprises performing a reactive extrusion of raw vegetable material in the presence of peroxides, producing a reaction mixture comprising a plant material, 0.5-12 wt.% of peroxide solution and 10-60 wt.% of water in an extruder device, obtaining an extrudate by heating the reaction mixture at 120-140[deg] C in the extruder device, and preparing the aggregates. The reaction mixture is cooled at 70-95[deg] C. The first plant material comprises 87-100 wt.% of starch and 0-13 wt.% of oil. The raw ground product is a grain from a cereal plant. The process comprises performing a reactive extrusion of raw vegetable material in the presence of peroxides, producing a reaction mixture comprising a plant material, 0.5-12 wt.% of peroxide solution and 10-60 wt.% of water in an extruder device, obtaining an extrudate by heating the reaction mixture at 120-140[deg] C in the extruder device, and preparing the aggregates. The reaction mixture is cooled at 70-95[deg] C. The first plant material comprises 87-100 wt.% of starch and 0-13 wt.% of oil. The raw ground product is a grain from a cereal plant, non-cereal plant and other aerial parts. The oil includes mineral oil, synthetic oil, vegetable oil and/or animal oil. The final granulates are dried and then coated using a hydrophobic coating material. An independent claim is included for light-weight plant aggregates. L'invention est relative à un procédé de fabrication de granulats légers par un procédé d'extrusion réactive d'une matière première végétale en présence de peroxyde. De manière préférée, la matière première végétale est riche en amidon. Dans certains modes de réalisation selon l'invention, cette matière première végétale est constituée par une matière brute céréalière et une huile. Les granulats d'origine végétale selon l'invention sont utilisables pour la fabrication de matériaux de construction tels que les bétons légers.