A supplementary cementitious material used in combination with an activator such as Portland cement to produce a hydraulic binder. The supplementary cementitious material is based on physico-chemically treated filter cake product extracted from dredged sediments and can partially replace Portland cement clinker in conventional concrete applications with positive effects on sustainability (reduction of CO2 emissions, upcycling of residues).

A supplementary cementitious material used in combination with an activator such as Portland cement to produce a hydraulic binder. The supplementary cementitious material is based on physico-chemically treated filter cake product extracted from dredged sediments and can partially replace Portland cement clinker in conventional concrete applications with positive effects on sustainability (reduction of CO2 emissions, upcycling of residues).

The invention relates to a method for binding of carbon dioxide, comprising: providing a starting material which comprises sources for CaO and SiO.sub.2 and optionally also Al, Fe and/or Mg, hydrothermally treating the starting material in an autoclave at 50 to 300 C., tempering at 350 to 600 C., and hardening the resulting material with carbon dioxide. The invention further relates to building elements which are obtained by hardening a material according to the method.

The invention relates to a method for binding of carbon dioxide, comprising: providing a starting material which comprises sources for CaO and SiO.sub.2 and optionally also Al, Fe and/or Mg, hydrothermally treating the starting material in an autoclave at 50 to 300 C., tempering at 350 to 600 C., and hardening the resulting material with carbon dioxide. The invention further relates to building elements which are obtained by hardening a material according to the method.

A supplementary cementitious material used in combination with an activator such as Portland cement to produce a hydraulic binder. The supplementary cementitious material is based on physico-chemically treated filter cake product extracted from dredged sediments and can partially replace Portland cement clinker in conventional concrete applications with positive effects on sustainability (reduction of CO2 emissions, upcycling of residues).

A supplementary cementitious material used in combination with an activator such as Portland cement to produce a hydraulic binder. The supplementary cementitious material is based on physico-chemically treated filter cake product extracted from dredged sediments and can partially replace Portland cement clinker in conventional concrete applications with positive effects on sustainability (reduction of CO2 emissions, upcycling of residues).

Disclosed is a method for backfilling and reconstructing a carbon storage space in an abandoned main roadway and storing CO.sub.2. A surrounding rock of the main roadway is surveyed through geophysical exploration technology, and an anchor bolts (anchor cables) are used to reinforce and support an area which has unstable confining pressure bearing. According to a width and a height of the roadway section of the main roadway, a support formwork is forged in advance, and after the support formwork is placed in the main roadway, backfilling slurry is injected to the periphery of the support formwork. Meanwhile, supercritical carbon dioxide is injected into the backfilling slurry and the roadway, respectively.

Disclosed is a combined process of integrating stoping-backfilling and carbon storage. The combined process includes the following steps of: determining a cyclic interval of a working face through measured data of a mine pressure of a fully-mechanized coal winning working face; when the stoping distance of the fully-mechanized coal winning working face reaches a backfilling isolation interval, providing a backfilling tarpaulin behind a hydraulic support, and pumping, through a backfilling pipeline, backfilling slurry to a backfilling area along a support beam; when the area is backfilled with the backfilling slurry, injecting supercritical carbon dioxide into the backfilling slurry; and allowing the supercritical carbon dioxide to fully react with the backfilling slurry to solidify the backfilling slurry.

The present invention relates to a new method for stabilising marine clays such as sediments, marine sediments, or dredging muds by using mussel shell powder and cement, their use and a respective product. A properly treated milled shell powder is mixed with a cement in order to obtain a solid composition of powders, which is subsequently mixed with the marine clay to obtain a product that can be used in the building industry.

The present invention relates to a new method for stabilising marine clays such as sediments, marine sediments, or dredging muds by using mussel shell powder and cement, their use and a respective product. A properly treated milled shell powder is mixed with a cement in order to obtain a solid composition of powders, which is subsequently mixed with the marine clay to obtain a product that can be used in the building industry.