A method of using a gas control additive to provide gas migration control in a wellbore includes the steps of mixing the gas control additive with a cement to form a cement slurry, where the gas control additive includes a semi-permeable membrane and a scrubbing agent, such that the semi-permeable membrane forms a shell around a core such that the scrubbing agent is in the core, introducing the cement slurry to the wellbore, and reacting the scrubbing agent with an antagonistic gas to produce a helper byproduct, where the antagonistic gas migrates from a hydrocarbon-bearing formation into the wellbore and permeates through the semi-permeable membrane to the core of the gas control additive.

The present disclosure relates to a cement or concrete composition comprising a hydraulic binder, a water reducing plasticiser, a rheological additive, and composite spheres for lowering the density of the composition, wherein the composite spheres comprise a core having one or more coating layers thereon.

The present disclosure relates to a cement or concrete composition comprising a hydraulic binder, a water reducing plasticiser, a rheological additive, and composite spheres for lowering the density of the composition, wherein the composite spheres comprise a core having one or more coating layers thereon.

The invention pertains to the fields of chemistry and construction and relates to surface-modified glass fiber for reinforcing concrete, such as those which can be used in textile-reinforced concrete (textile concrete), for example. The object of the present invention is to provide surface-modified glass fibers for reinforcing concrete, which glass fibers are at least substantially protected against an alkaline attack caused by the calcium hydroxides released during the cement reaction and/or dissolution and leaching processes generated thereby. The object is attained with surface-modified glass fibers for reinforcing concrete which are at least partially covered at least with a hydrolysis-stable and alkali-resistant cationic polyelectrolyte and/or hydrolysis-stable and alkali-resistant cationic polyelectrolyte mixture and/or with a hydrolysis-stable and alkali-resistant polyelectrolyte complex and coupled to the glass fiber surface via a (polyelectrolyte) complex formation process by means of ionic bonding, with the hydrolysis-stable and alkali-resistant polyelectrolyte complex A thereby being formed, wherein at least one additional (co)polymer at least partially covers the polyelectrolyte complex A and is coupled with the polyelectrolyte A via ionic and/or covalent bonds.

An object of the present invention is to provide an inorganic board suitable for achieving high specific strength and high freeze-thaw resistance as well as weight reduction and a method for producing the inorganic board. An inorganic board X1 according to the present invention includes a cured layer 11 that includes an inorganic cured matrix, an organic reinforcement material dispersed therein, and a hollow body that is attached to the organic reinforcement material and is smaller than the maximum length of the organic reinforcement material. A method for producing an inorganic board according to the present invention includes a first step of preparing a first mixture through mixing of an organic reinforcement material and a hollow body smaller than the maximum length of the organic reinforcement material, a second step of preparing a second mixture through mixing of the first mixture, a hydraulic material, and a siliceous material, and a third step of forming a second mixture mat by depositing the second mixture.

An object of the present invention is to provide an inorganic board suitable for achieving high specific strength and high freeze-thaw resistance as well as weight reduction and a method for producing the inorganic board. An inorganic board X1 according to the present invention includes a cured layer 11 that includes an inorganic cured matrix, an organic reinforcement material dispersed therein, and a hollow body that is attached to the organic reinforcement material and is smaller than the maximum length of the organic reinforcement material. A method for producing an inorganic board according to the present invention includes a first step of preparing a first mixture through mixing of an organic reinforcement material and a hollow body smaller than the maximum length of the organic reinforcement material, a second step of preparing a second mixture through mixing of the first mixture, a hydraulic material, and a siliceous material, and a third step of forming a second mixture mat by depositing the second mixture.

Embodiments provide a method for controlled release of a cement additive for use in a wellbore. The method includes the steps of mixing an aramide capsule with a cement slurry to form an additive-containing slurry, and introducing the additive-containing slurry into the wellbore. The aramide capsule is formed by interfacial polymerization where an aramide polymer forms a semi-permeable membrane encapsulating the cement additive.

Embodiments provide a method for controlled release of a cement additive for use in a wellbore. The method includes the steps of mixing an aramide capsule with a cement slurry to form an additive-containing slurry, and introducing the additive-containing slurry into the wellbore. The aramide capsule is formed by interfacial polymerization where an aramide polymer forms a semi-permeable membrane encapsulating the cement additive.

This invention relates to fusion bonded epoxy rebar powder coating compositions of enough latency overtime, which cure in seconds upon residual heat up to 239.0 C., exhibiting low temperature flexibility to achieve crack-free rebar bending at 45 C. and a glossy finish without yellowing or discoloration. This invention further relates to rebar powder coatings compounded using suitable dihydrazide amines as the curing agent, in combination with an executive resin blend including a compatible toughening epoxy, and a synergic catalyst package to meet the intended application challenges.

The invention relates to the use of carboxylic acid-based polyoxyalkylenes as low-emissions shrinkage reducers in mineral binders, to methods of reducing shrinkage and to corresponding compositions.