The present invention describes a hydraulic cement composition, its obtaining process and its use. More precisely, the hydraulic cement composition comprises increased resistance to CO.sub.2 for application in subsurface fluid reservoirs.

The present invention relates to a mechanically carboxylated fly ash which has a BET surface area of less than 50 m.sup.2/g and a CO.sub.2 content of more than 1 wt. %. The invention further relates to methods of its production and uses thereof, for example as a filler. The invention further relates to compositions comprising the mechanically carboxylated fly ash and a further material selected from the group consisting of asphalt, cement, polymers and combinations thereof and methods of their production.

The present invention relates to a mechanically carboxylated fly ash which has a BET surface area of less than 50 m.sup.2/g and a CO.sub.2 content of more than 1 wt. %. The invention further relates to methods of its production and uses thereof, for example as a filler. The invention further relates to compositions comprising the mechanically carboxylated fly ash and a further material selected from the group consisting of asphalt, cement, polymers and combinations thereof and methods of their production.

The present invention relates to compositions comprising a mechanochemically carboxylated mineral filler and a binder, wherein the binder is cement and/or asphalt and wherein the filler is obtainable by mechanochemically carboxylating a silicate mineral. The invention further relates to a method for preparing said compositions. The invention further relates to a method for preparing concrete from these compositions and to the concrete obtainable from said method for preparing concrete. The invention also relates to uses of the mechanochemically carboxylated mineral filler, for example as a filler in asphalt or cement.

The present invention relates to compositions comprising a mechanochemically carboxylated mineral filler and a binder, wherein the binder is cement and/or asphalt and wherein the filler is obtainable by mechanochemically carboxylating a silicate mineral. The invention further relates to a method for preparing said compositions. The invention further relates to a method for preparing concrete from these compositions and to the concrete obtainable from said method for preparing concrete. The invention also relates to uses of the mechanochemically carboxylated mineral filler, for example as a filler in asphalt or cement.

A method for making concrete and concrete structures includes: providing a liquid admixture with a carbon nanomaterial in a liquid aqueous or organic solvent/compound mixture, mixing the liquid admixture with cement and water in a dosage selected to form a concrete mix having a carbon nanomaterial structure having individual carbon nanomaterial particles with a unit cell overlap, and hardening the concrete mix to form a concrete matrix with the carbon nanomaterial forming a 3-dimensional carbon nanomaterial network incorporated into the concrete matrix. The 3-dimensional carbon nanomaterial network has a shielding effect against high frequency electromagnetic pulses and other radiofrequency signals.

A method for making concrete and concrete structures includes: providing a liquid admixture with a carbon nanomaterial in a liquid aqueous or organic solvent/compound mixture, mixing the liquid admixture with cement and water in a dosage selected to form a concrete mix having a carbon nanomaterial structure having individual carbon nanomaterial particles with a unit cell overlap, and hardening the concrete mix to form a concrete matrix with the carbon nanomaterial forming a 3-dimensional carbon nanomaterial network incorporated into the concrete matrix. The 3-dimensional carbon nanomaterial network has a shielding effect against high frequency electromagnetic pulses and other radiofrequency signals.

Disclosed is a new composite material comprising nanocellulose and hemp or a hemp-derived component, such as pure hemp, hemp bast fibers, hemp inner fibers, hemp shives, hemp leaves, hemp seeds, or ground hemp. The nanocellulose may be hydrophobic or hydrophilic, and may include cellulose nanocrystals, cellulose nanofibrils, cellulose microfibrils, or a combination thereof. This invention provides construction blocks or panels; engineered parts; fire-resistant objects; coatings; containers; textile compositions; and fabric materials, for example. The composite material may also include one or more additives to modify mechanical, thermal, chemical, and/or electrical properties. The addition of nanocellulose can improve the mechanical properties of hemp-containing concrete mixtures to improve compressive strength for construction purposes.

Disclosed are: damage-resistant ECMCs that need to work and remain elastic between minus 120° C. and positive 300° C.; ECMCs that need to be able to contain a flame of 1900° C. for more than 90 minutes; and composite structures, especially highly stressed structures. One of the characteristic problems of ceramic matrices is their fragility. Indeed, when a fracture starts, it propagates easily in the matrix. Disclosed are elastic ceramic matrix composites (ECMCs), for which: the ceramic matrix is split into solid “ceramic microdomains” (CMDs); the CMDs are connected to one another by a dense network of “elastic microelements” (EMEs); and the bonds between the EMEs and the CMDs are strong chemical bonds, preferably covalent.

Disclosed are: damage-resistant ECMCs that need to work and remain elastic between minus 120° C. and positive 300° C.; ECMCs that need to be able to contain a flame of 1900° C. for more than 90 minutes; and composite structures, especially highly stressed structures. One of the characteristic problems of ceramic matrices is their fragility. Indeed, when a fracture starts, it propagates easily in the matrix. Disclosed are elastic ceramic matrix composites (ECMCs), for which: the ceramic matrix is split into solid “ceramic microdomains” (CMDs); the CMDs are connected to one another by a dense network of “elastic microelements” (EMEs); and the bonds between the EMEs and the CMDs are strong chemical bonds, preferably covalent.