The effectiveness of expansive cement systems may be diluted when, during a well cementing operation, commingling takes place between the cement slurry and a spacer fluid, a drilling fluid, or both. Incorporating expansive agents in the spacer fluid or drilling fluid may reduce or negate the loss of expansion at the cement slurry/spacer interface or the cement slurry/drilling fluid interface, thereby promoting zonal isolation throughout the cemented interval.

A liquid additive composition comprising a particulate material, an organic carrier fluid, a viscosifier, and an alcohol alkoxylate surfactant; wherein the particulate material is substantially insoluble in the organic carrier fluid; wherein the particulate material comprises a water-interactive material and/or a water-insoluble material; wherein the organic carrier fluid comprises a glycol and/or a glycol ether; and wherein the viscosifier comprises amorphous silica. A method comprising (a) contacting a particulate material, an organic carrier fluid, a viscosifier, and an alcohol alkoxylate surfactant to form a mixture; and (b) agitating the mixture to form the liquid additive composition.

A liquid additive composition comprising a particulate material, an organic carrier fluid, a viscosifier, and an alcohol alkoxylate surfactant; wherein the particulate material is substantially insoluble in the organic carrier fluid; wherein the particulate material comprises a water-interactive material and/or a water-insoluble material; wherein the organic carrier fluid comprises a glycol and/or a glycol ether; and wherein the viscosifier comprises amorphous silica. A method comprising (a) contacting a particulate material, an organic carrier fluid, a viscosifier, and an alcohol alkoxylate surfactant to form a mixture; and (b) agitating the mixture to form the liquid additive composition.

A process for producing hydrophobic and reactive, inorganic and/or organic fillers, including the steps of: (a) providing a filler having a defined surface area, (b) mixing the filler with the solution of at least one hydrophobizing and activating, biologically based reactive compound in a mixing assembly in an amount of 0.15×10-2 to 5.0×10-2 g per m2 filler surface area at a speed of 20 rpm to 200 rpm for 12 minutes to 120 minutes, (c) evacuating the hydrophobized and activated, inorganic and/or organic filler in a storage bag, a box or a drum, or directly in the casting compound.

A process for producing hydrophobic and reactive, inorganic and/or organic fillers, including the steps of: (a) providing a filler having a defined surface area, (b) mixing the filler with the solution of at least one hydrophobizing and activating, biologically based reactive compound in a mixing assembly in an amount of 0.15×10-2 to 5.0×10-2 g per m2 filler surface area at a speed of 20 rpm to 200 rpm for 12 minutes to 120 minutes, (c) evacuating the hydrophobized and activated, inorganic and/or organic filler in a storage bag, a box or a drum, or directly in the casting compound.

An electrical steel sheet (1) includes a base material (2) of electrical steel, and an insulating film (3) formed on a surface of the base material (2), the insulating film (3) containing a polyvalent metal phosphate and Fe. A maximum value of a parameter Q expressed by “Q=C.sub.Fe—O/C.sub.P” is equal to or less than 1.3 times an average value of the parameter Q in a region from a first depth from a surface of the insulating film to a second depth, C.sub.Fe—O denoting a proportion (atom %) of Fe bonded to O relative to all elements, and C.sub.P denoting a proportion (atom %) of P relative to all elements. The first depth is 20 nm from the surface, and the second depth is a depth where the proportion of P is equal to a proportion of metal Fe.

An electrical steel sheet (1) includes a base material (2) of electrical steel, and an insulating film (3) formed on a surface of the base material (2), the insulating film (3) containing a polyvalent metal phosphate and Fe. A maximum value of a parameter Q expressed by “Q=C.sub.Fe—O/C.sub.P” is equal to or less than 1.3 times an average value of the parameter Q in a region from a first depth from a surface of the insulating film to a second depth, C.sub.Fe—O denoting a proportion (atom %) of Fe bonded to O relative to all elements, and C.sub.P denoting a proportion (atom %) of P relative to all elements. The first depth is 20 nm from the surface, and the second depth is a depth where the proportion of P is equal to a proportion of metal Fe.

The invention discloses a strontium ferrite-based sacrificial mortar and its preparation method, the strontium ferrite-based sacrificial mortar mainly comprises 720-1000 parts of sulphoaluminate cement, 100-300 parts of strontium ferrite, 600-650 parts of quartz sand, 400-450 parts of water and 0.01-35 parts of superplasticizer. The preparation process is simple, and the strontium ferrite-based sacrificial mortar can be prepared by using a conventional forced single horizontal shaft concrete mixer. The obtained mortar has excellent working performance, compressive strength and corrosion resistance. It can be used in the current third and future fourth generation nuclear power plant core catchers, and has obvious engineering application value.

The invention discloses a strontium ferrite-based sacrificial mortar and its preparation method, the strontium ferrite-based sacrificial mortar mainly comprises 720-1000 parts of sulphoaluminate cement, 100-300 parts of strontium ferrite, 600-650 parts of quartz sand, 400-450 parts of water and 0.01-35 parts of superplasticizer. The preparation process is simple, and the strontium ferrite-based sacrificial mortar can be prepared by using a conventional forced single horizontal shaft concrete mixer. The obtained mortar has excellent working performance, compressive strength and corrosion resistance. It can be used in the current third and future fourth generation nuclear power plant core catchers, and has obvious engineering application value.

The present invention relates to fiber cement flooring products. In particular, the present invention provides fiber cement flooring products, at least comprising cement and fibers, characterized in that these fiber cement flooring products comprise amorphous silica in an amount of between about 2 weight % and about 15 weight % compared to the total dry weight of the fiber cement composition of said fiber cement flooring product. The present invention further relates to methods for the production of such fiber cement flooring products as well as uses of such fiber cement flooring products in the building industry. The present invention further relates to fiber cement formulations and fiber cement materials, which are suitable for the production of fiber cement products for flooring applications.