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Process for the production of building units from afterharding materials

  • US 4,927,573 A
  • Filed: 09/14/1989
  • Issued: 05/22/1990
  • Est. Priority Date: 05/05/1987
  • Status: Expired due to Fees
First Claim
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1. Process for the production of building units from an afterhardening mixture containing cement, additives and water as binding material, the process including the steps of admitting the afterhardening mixture into a die which has an inlet port for insertion of the afterhardening mixture and an outlet port for removal of the afterhardening mixture in compacted form, injecting CO2 gas into the afterhardening mixture and bringing about a carbonation reaction with the afterhardening mixture, pressing the afterhardening mixture continuously in the die while injecting the CO2 gas into the afterhardening mixture under pressure, controlling the injecting of the CO2 gas so as to provide a greater amount of the gas flowing through the afterhardening mixture near the inlet port of the die as compared to the amount of the gas flowing through the afterhardening mixture near the outlet port, mechanically compacting the afterhardening mixture at the inlet port and faces of the die, and thereby forming a generally gastight seal between the afterhardening material and the die, controlling the injecting of the CO2 gas into the die so that full completion or essentially full completion of the carbonation reaction occurs, and removing the afterhardening mixture in compacted form from the die and separating the afterhardening mixture in compacted form into the building units.

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