Process for calcining mineral rock in a regenerative parallel-flow vertical shaft furnace, containing at least two shafts (1, 2) interconnected by a gas transfer channel (3), each shaft operating alternately in firing mode and in preheating mode, the firing mode comprising a combustion of fuel in the presence of air so as to obtain a firing of the rock to give calcined rock, an emission of combustion gases, and a passage of these gases from one shaft to the other by means of said channel (3), the preheating mode comprising a heat exchange between said rock and said combustion gases from said channel (3), this process additionally comprising an injection of supplementary air into said channel (3) with oxidation of unburnt products contained in the combustion gases passing through this channel.

An agent for stabilizing lime milk may combine a specific polymer and one or more osidic, polyol, or acid derivatives. Methods may preparing the agent or prepare lime milk stabilized with the agent. Such a stabilized lime milk can be used to control the pH of a composition, which composition can then be used in a variety of fields. Such a lime milk stabilized with the agent can be used to treat acid effluents or acid fumes. A powder formulation or a paste formulation may be used for preparing stabilized lime milk.

Quarry fines and/or limestone powder are used to reduce clinker content in concrete, mortar and other cementitious compositions, typically in combination with one or more pozzolanically active SCMs. Quarry fines and/or limestone powder can replace and/or augment a portion of hydraulic cement binder and/or fine aggregate. Quarry fines and/or limestone powder can advantageously replace a portion of cement binder and fine aggregate, acting as an intermediate that fills a particle size void between the largest cement particles and smallest fine aggregate particles. Supplemental lime can advantageously maintain or enhance balance of calcium ions in the mix water and/or pore solution. Supplemental sulfate can advantageously address sulfate deficiencies caused by high clinker reduction, use of water reducers and/or superplasticers, and SCMs containing aluminates. Such systematic approach to beneficially using quarry fines, limestone powder, SCMs, lime, and sulfate addresses many issues and permits high clinker reduction with similar or increased strength.

Quarry fines and/or limestone powder are used to reduce clinker content in concrete, mortar and other cementitious compositions, typically in combination with one or more pozzolanically active SCMs. Quarry fines and/or limestone powder can replace and/or augment a portion of hydraulic cement binder and/or fine aggregate. Quarry fines and/or limestone powder can advantageously replace a portion of cement binder and fine aggregate, acting as an intermediate that fills a particle size void between the largest cement particles and smallest fine aggregate particles. Supplemental lime can advantageously maintain or enhance balance of calcium ions in the mix water and/or pore solution. Supplemental sulfate can advantageously address sulfate deficiencies caused by high clinker reduction, use of water reducers and/or superplasticers, and SCMs containing aluminates. Such systematic approach to beneficially using quarry fines, limestone powder, SCMs, lime, and sulfate addresses many issues and permits high clinker reduction with similar or increased strength.

The present disclosure provides compositions and methods for accelerating soil stabilization using carbon dioxide.

The present disclosure provides compositions and methods for accelerating soil stabilization using carbon dioxide.

A calcium hydroxide slurry is formed by combining a polymer additive with lime and water to form an aqueous slurry. The slurry so produced is viscostable, resists hard packing even after prolonged storage, is easily redispersed and has antiscaling properties. The amount of lime used is between 35 to 55% by weight of the slurry. The polymer additive is a polycarboxylate dispersing agent and is added in an amount between about 0.1 to 3% by weight of lime.

A calcium hydroxide slurry is formed by combining a polymer additive with lime and water to form an aqueous slurry. The slurry so produced is viscostable, resists hard packing even after prolonged storage, is easily redispersed and has antiscaling properties. The amount of lime used is between 35 to 55% by weight of the slurry. The polymer additive is a polycarboxylate dispersing agent and is added in an amount between about 0.1 to 3% by weight of lime.

A lime slaker system for converting quicklime to a lime slurry includes: a lime feeder; a base slaker that includes a slaking chamber and a dilution chamber; a grit remover; and a modular water panel with a piping assembly in fluid communication with at least the base slaker and grit remover. The modular water panel is configured to independently control water distributed to the slaking compartment, the dilution chamber, and the grit remover.

Glass-fiber-reinforced concrete compositions that may be sprayed, and methods of preparing and applying such compositions. Such compositions may include cement, reinforcing glass fibers randomly oriented and homogenously distributed throughout the concrete composition, and a particle packing aggregate. At least a portion of the particle packing aggregate may be rounded rather than crushed and include a first aggregate portion having a first particle size and a second aggregate portion having a second particle size that is smaller than the first particle size so that the aggregate is capable of particle packing. The uncured compositions can be delivered through a spray nozzle with the glass fibers already mixed into the composition. The compositions can provide uniform, non-directional strength characteristics, e.g., modulus of rupture of at least 16 MPa and a limit of proportionality of at least 7 MPa with a glass-fiber content of no more than 4% by weight.