摘要:
The present invention relates to calcium silicate-based cements and concretes, which result in concrete compositions that have an improved strength development. The invention also relates to a cement product comprising: - a plurality of particles of a carbonatable calcium silicate cement and - a first additive; wherein, the first additive is an organic molecule with at least one primary, secondary or tertiary amine group. - Calcium silicate-based cements and concretes.
摘要:
Methods, compositions, and tools for use in creating rapidly forming plugs in situ in subterranean formations. In one instance, the disclosure provides a method that includes: placing a first pill comprising a calcium-aluminate-based cement composition at a plug location within the wellbore with the tubing; and placing a second pill comprising an alkaline fluid composition into the wellbore adjacent to the first pill with the tubing. In some cases there is a spacer fluid or spacer device between the first pill and the second pill. In some cases tubing having a mixing device is located at the bottom of the tubing in the wellbore to aid I mixing the first pill and the second pill to facilitate a chemical in situ reaction of the first pill and the second pill. The reaction between the first pill and the second pill forms a set plug at the plug location.
摘要:
Zusatzmittel, welches die Festigkeitsentwicklung von hydraulischen Bindemittlen beschleunigt, umfassend ein Alkanolamin der Formel wobei R 1 für Alkyl mit mindestens 3 Hydroxygruppen steht und R 2 und R 3 unabhängig voneinander für eine Alkylgruppe oder eine ein- oder mehrwertige Alkanolgruppe stehen, und Verfahren zur Beschleunigung der Festigkeitsentwicklung von hydraulischen Bindemitteln bei dem dieses zugefügt wird.
摘要:
Bismuth oxyhalide-added building materials are disclosed. The building material is a binder-containing building material, which sets and harden when mixed with water, such as gypsum and cement-based building material. Methods for applying bismuth oxyhalide - comprising coatings onto surfaces of building materials, to protect them against pollutants, are described.
摘要:
The various embodiments herein provide a prefabricated mineral composite panel and a method for producing the prefabricated mineral composite panel for constructing the internal walls and the lateral walls in a building. The method comprising the steps of: preparing and assembling a cast, fixing a mesh in the cast, pouring a prefabricated mineral composite into the cast, smoothening and flattening a top surface of the cast, disassembling the cast to withdraw a semi- dried prefabricated mineral composite panel, placing the semi-dried prefabricated mineral composite panel in a drying room for drying the prefabricated mineral composite, removing the dried prefabricated mineral composite panel from the drying room and packaging the prefabricated mineral composite panel.
摘要:
Embodiments relate to cementing operations and, in certain embodiments, to passivated cement accelerators and methods of using passivated cement accelerators in subterranean formations. An embodiment may comprise a method of cementing comprising: providing a cement composition comprising cement, water, and a passivated cement accelerator; and allowing the cement composition to set.
摘要:
Disclosed are methods for the preparation of alkyl hydroxyalkyl cellulose ethers, and the use of such alkyl hydroxyalkyl cellulose ethers in the preparation and use of mortars and other cement-based systems; also disclosed is a hydraulic composition containing at least one retarder, at least one accelerator and a cellulose ether having a prolonged open time without deterioration of the other cement tile adhesive properties such as workability, setting time, strength development and sag resistance; and further disclosed are dry mortars containing encapsulated calcium chloride used in preparing mortar materials for use in construction, and the preparation and use of such mortars in cold weather environments is also disclosed.
摘要:
A variety of methods and compositions are disclosed, including, in one embodiment a method a cementing in a subterranean formation comprising: providing a set-delayed cement composition comprising water, pumice, hydrated lime, and a set retarder; foaming the set-delayed cement composition; activating the set-delayed cement composition; introducing the set-delayed cement composition into a subterranean formation; and allowing the set-delayed cement composition to set in the subterranean formation. Additional methods, foamed set-delayed cement composition, and systems for cementing are also provided.
摘要:
Set-delayed cement compositions and methods of using set-delayed cement compositions in subterranean formations. Embodiments include a method of drilling a wellbore in a subterranean formation comprising: circulating a drilling fluid comprising a set-delayed cement composition in the wellbore while drilling the wellbore, wherein the set-delayed cement composition comprises: pumice, hydrated lime, a set retarder, and water. A method of displacing a fluid in a wellbore comprising: introducing a spacer fluid comprising a set-delayed cement composition into a wellbore such that the spacer fluid displaces one or more prior fluids from the wellbore, and wherein the set-delayed cement composition comprises: pumice, hydrated lime, a set retarder, and water.
摘要:
The present invention relates to a binder comprising calcium sulfoaluminate (CSA) cement and a magnesium compound, to a method of enhancing strength development and/or increasing compressive strength of building structures from CSA binders and to the use of magnesium compounds as additives for increasing compressive strength of hydrated CSA binders wherein the magnesium compound is chosen from - low (300 to 4 or K 2 Mg 2 (SO 4 ) 3 ), chloride, nitrate, hydrogencarbonate or MgCO 3 wH 2 O with w ranging from 1 to 3, xMgCO 3 -yMg(OH) 2 zH 2 O with x ranging from 1 to 4, y ranging from 0.5 to 2 and z ranging from 0 to 5 - magnesium salts of organic acids, preferably formiate or acetate - an amorphous magnesium compound (e.g. based on Mg(OH) 2 , MgO, MgCO 3 zH 2 O, magnesium silicate hydrates or mixtures thereof) - SCM rich in MgO, i.e. with a content of MgO > 10 % by weight - mixtures of two or more of the foregoing.