Patent ID: 8728365
Filing Date: 2014-05-20
Classification: B33Y,C04B

Abstract:
1. A method for producing construction material comprising: at least partially filling a formwork with loose pieces of aggregate wherein gaps are formed between at least some of the pieces; preparing a first solution which includes urease which is formed by an enzyme producing bacteria; adding an amount of the first solution to the loose aggregate; adding an amount of urea and an amount of calcium ions to the loose aggregate; the first solution, the urea and the calcium ions being added to the loose aggregate simultaneously or at different times or in a different order; the calcium ions contributing to the formation of calcium carbonate; the calcium carbonate fills at least some of the gaps between the loose pieces of aggregate, bonding to the aggregate and thereby forming a solid material; rotating the formwork; adding an additional amount of first solution to the loose aggregate; adding an additional amount of the urea and calcium ions to the loose aggregate; the additional amounts of the first solution and the urea and calcium ions being added to the loose aggregate simultaneously or at different times or in a different order; and removing the solid construction material from the formwork.