A process for producing cement includes combining a cement precursor and a wax, wherein the wax includes alkyl ketene dimer wax and/or alkenyl ketene dimer wax, grinding the cement precursor and the wax to yield cement grains coated with the wax. A cement includes cement powder grains and a coating of wax on the Portland cement powder grains, wherein the wax includes alkyl ketene dimer wax and/or alkenyl ketene dimer wax. A process for making cementitious material includes combining a cement with water to yield a slurry, wherein the cement includes cement powder grains and a coating of wax on the cement powder grains, wherein the wax includes alkyl ketene dimer wax and/or alkenyl ketene dimer wax, and allowing the slurry to set.

Methods of processing biological materials such as the remains of humans or pets, which may be enclosed in a casket, include depositing the biological materials, including the remains and/or the casket, into a cement kiln and operating the cement kiln to produce clinker, thereby incorporating products of the biological remains into the clinker, such as into a crystal or molecular structure of the clinker, and then grinding the clinker to form a cementitious product.

Methods of processing biological materials such as the remains of humans or pets, which may be enclosed in a casket, include depositing the biological materials, including the remains and/or the casket, into a cement kiln and operating the cement kiln to produce clinker, thereby incorporating products of the biological remains into the clinker, such as into a crystal or molecular structure of the clinker, and then grinding the clinker to form a cementitious product.

A method of carbonating cement powder and use thereof. An amount of water is supplied to an initial cementitious powder to create a moistened cementitious powder. Carbon dioxide is supplied to the moistened cementitious powder, while mechanically stirring the moistened cementitious powder, to cause a reaction of the carbon dioxide with the moistened cementitious powder to produce a carbonated cementitious material. The carbonated cementitious material is dried and ground to produce a carbonated cementitious powder. The carbonated cementitious powder may be combined with ordinary cement and various ingredients or additives, such as retarders, accelerators and extenders for use in well cementing applications. Methods for cementing casing, liners and remedial operations such as plugging back, and squeeze cementing are also provided. Methods for producing a low alkaline cement suitable for high CO.sub.2 gas wells are also provided. Methods to achieve a stable retarded cement used in higher temperatures are provided.

A method of carbonating cement powder and use thereof. An amount of water is supplied to an initial cementitious powder to create a moistened cementitious powder. Carbon dioxide is supplied to the moistened cementitious powder, while mechanically stirring the moistened cementitious powder, to cause a reaction of the carbon dioxide with the moistened cementitious powder to produce a carbonated cementitious material. The carbonated cementitious material is dried and ground to produce a carbonated cementitious powder. The carbonated cementitious powder may be combined with ordinary cement and various ingredients or additives, such as retarders, accelerators and extenders for use in well cementing applications. Methods for cementing casing, liners and remedial operations such as plugging back, and squeeze cementing are also provided. Methods for producing a low alkaline cement suitable for high CO.sub.2 gas wells are also provided. Methods to achieve a stable retarded cement used in higher temperatures are provided.

Methods of processing biological materials such as the remains of humans or pets, which may be enclosed in a casket, include depositing the biological materials, including the remains and/or the casket, into a cement kiln and operating the cement kiln to produce clinker, thereby incorporating products of the biological remains into the clinker, such as into a crystal or molecular structure of the clinker, and then grinding the clinker to form a cementitious product.

Methods of processing biological materials such as the remains of humans or pets, which may be enclosed in a casket, include depositing the biological materials, including the remains and/or the casket, into a cement kiln and operating the cement kiln to produce clinker, thereby incorporating products of the biological remains into the clinker, such as into a crystal or molecular structure of the clinker, and then grinding the clinker to form a cementitious product.

A process to enhance the pozzolanic activity of a natural inactive sedimentary pozzolan and the pozzolanic material formed by the process are described. The process comprises the steps of finely dividing the pozzolan to a Blaine fineness of at least 8,000 cm.sup.2/g for increasing the surface area of the finely ground pozzolan and exposing a great amount of the number of silicon and aluminum atoms available to react with lime in a pore solution.

The present invention provides a method of preparing a recycled cementitious material by a phosphogypsum-assisted carbon sequestration pretreatment process. The method includes: (1) placing 100 mass parts of phosphogypsum, 1 to 2 mass parts of grinding aid, 10 to 20 mass parts of sodium-containing alkali component, 150 to 300 mass parts of zirconia balls, and 150 to 300 mass parts of water into a wet grinding tank for wet grinding. After 10 min to 30 min of wet grinding, introducing CO.sub.2 at a flow rate of 1.5 to 2.2 mass parts/min to keep a temperature of a wet grinding slurry below 40° C. When the wet grinding slurry reaches pH=10, ending the wet grinding and sieving out a wet grinding slurry; (2) mixing the wet grinding slurry with 700 to 1000 mass parts of slag and 100 to 350 mass parts of water to obtain a recycled cementitious material.

Synthesis and application of an alcohol amine with an extended main carbon chain are provided, belonging to the field of chemical building materials. Under the action of a catalyst, tertiary amine is subjected to a two-step substitution reaction, a hydrolytic reaction and a reducing reaction to obtain a novel alcohol amine (NAA). The novel alcohol amine as provided may have a better grinding aid effect than triethanolamine while is added into cement as a cement grinding aid, and thus has a wide application prospect.