A cement composition including a dry phase and a liquid phase. The dry phase includes an aluminosilicate source, including amorphous bagasse ash with a concentration between 40 wt. % and 100 wt. % of the weight of the dry phase. The liquid phase includes at least one of water and an alkaline activator solution. The alkaline activator solution includes at least one of an alkali metal stearate, an alkali metal silicate, and an alkali metal hydroxide.

A cement composition including a dry phase and a liquid phase. The dry phase includes an aluminosilicate source, including amorphous bagasse ash with a concentration between 40 wt. % and 100 wt. % of the weight of the dry phase. The liquid phase includes at least one of water and an alkaline activator solution. The alkaline activator solution includes at least one of an alkali metal stearate, an alkali metal silicate, and an alkali metal hydroxide.

The additive for reinforced concrete is a concrete additive for preventing corrosion of steel rebars in steel-reinforced concrete, improving the workability of the cast concrete, and reducing water absorption/permeability in the cast concrete. The reinforced concrete may be a conventional reinforced concrete, such as that formed from a mixture of water, an aggregate and cement, having at least one steel rebar embedded in the mixture. The additive is added to the mixture prior to curing and casting. The additive may for example, have a concentration with respect to the cement of between 0.25 wt % and 1.0 wt %. The additive includes a triazole and a non-ionic surfactant including a poly oxy ethoxylated reaction product of sorbitan and a fatty acid. The triazole and the non-ionic surfactant are dissolved in the solvent.

The additive for reinforced concrete is a concrete additive for preventing corrosion of steel rebars in steel-reinforced concrete, improving the workability of the cast concrete, and reducing water absorption/permeability in the cast concrete. The reinforced concrete may be a conventional reinforced concrete, such as that formed from a mixture of water, an aggregate and cement, having at least one steel rebar embedded in the mixture. The additive is added to the mixture prior to curing and casting. The additive may for example, have a concentration with respect to the cement of between 0.25 wt % and 1.0 wt %. The additive includes a triazole and a non-ionic surfactant including a poly oxy ethoxylated reaction product of sorbitan and a fatty acid. The triazole and the non-ionic surfactant are dissolved in the solvent.

A well bore cementing system may comprise a spacer fluid and a cement slurry. The spacer fluid may be positioned within a well bore, and the spacer fluid may comprise a first surfactant package comprising one or more surfactants. The cement slurry may be positioned within the well bore, and the cement slurry may comprise a second surfactant package comprising one or more surfactants.

The invention relates to a process for the preparation of a novel precipitated silica, wherein: a silicate is reacted with an acidifying agent, so as to obtain a silica suspension; said silica suspension is filtered, so as to obtain a filter cake; said filter cake is subjected to a liquefaction operation, in the absence of an aluminium compound; wherein a mixture of polycarboxylic acids is added to the filter cake, during or after the liquefaction operation. It also relates to novel precipitated silicas and to their uses.

The invention relates to a process for the preparation of a novel precipitated silica, wherein: a silicate is reacted with an acidifying agent, so as to obtain a silica suspension; said silica suspension is filtered, so as to obtain a filter cake; said filter cake is subjected to a liquefaction operation, in the absence of an aluminium compound; wherein a mixture of polycarboxylic acids is added to the filter cake, during or after the liquefaction operation. It also relates to novel precipitated silicas and to their uses.

A composition includes: an ethoxylated fatty alcohol having from 8 to 22 carbon atoms and having an ethoxylation level of from 1 to 10 moles of ethylene oxide per mole of fatty alcohol, —an alkanolamine or a morpholine, or its derivatives or mix of them, and a fatty acid. A hydraulic binder includes the composition. A process prevents the formation of a surface film at the surface of hydraulic binders, wherein the composition is added to the dry hydraulic binder. A process for preparing the composition, includes: melting the ethoxylated fatty alcohol and heating it at a temperature above its melting point, adding water to the melted ethoxylated fatty alcohol and mixing, adding fatty acid to the mixture and mixing, adding alkanolamine or morpholine, or its derivative or mix of them to the mixture obtained and mixing, and adding water.

A composition includes: an ethoxylated fatty alcohol having from 8 to 22 carbon atoms and having an ethoxylation level of from 1 to 10 moles of ethylene oxide per mole of fatty alcohol, —an alkanolamine or a morpholine, or its derivatives or mix of them, and a fatty acid. A hydraulic binder includes the composition. A process prevents the formation of a surface film at the surface of hydraulic binders, wherein the composition is added to the dry hydraulic binder. A process for preparing the composition, includes: melting the ethoxylated fatty alcohol and heating it at a temperature above its melting point, adding water to the melted ethoxylated fatty alcohol and mixing, adding fatty acid to the mixture and mixing, adding alkanolamine or morpholine, or its derivative or mix of them to the mixture obtained and mixing, and adding water.

Drilling fluid compositions include a base fluid, at least one additive chosen from an emulsifier, weighting material, fluid-loss additive, viscosifier, or alkali compound, and from 0.1 wt. % to 1 wt. %, based on total weight of the drilling fluid composition, of an ethoxylated alcohol compound having the formula R—(OCH.sub.2CH.sub.2).sub.7—OH, in which R is a saturated or unsaturated, linear or branched hydrocarbyl group having from 8 to 20 carbon atoms. The base fluid may be an aqueous base fluid. Methods for drilling a subterranean well include operating a drill in a wellbore in the presence of a drilling fluid composition including the base fluid, the additive, and the ethoxylated alcohol compound.