摘要:
The invention relates to the use of copolymers on a polyamide basis, containing at least one graft lateral chain consisting of ethylenic unsaturated compounds, in construction chemistry, as well as with the prospecting, exploiting and completion of oil- and gas deposits and with deep bore holes. Preference is given to the use with compounds containing hydraulic binding agents, particularly as a water-retaining agent. The cementing of oil- and gas drillings is of particular importance. Typical representatives of the polyamide component are natural polyamides, like caseins, galantines, collagens and soy proteins. The copolymers used in the invention, having typically a molar mass of Mn > 20 000 g/mol, representatives being water-soluble and biodegradable are particularly preferred.
摘要:
A construction article including a compacted mixture that includes soil and a crop plant biomass microorganism-expressed enzyme composition. A method of stabilizing soil including: (i) mixing together soil, water and a crop plant biomass microorganism-expressed enzyme composition to form a mixture; (ii) causing the mixture to be shaped into a selected structure; and (iii) causing the structure to be compacted.
摘要:
Disclosed are formulations adapted to form a foamed cementitious composition, the foamed cementitious composition itself, a method of forming a hydraulic binder foam, and a method of conveying and applying the resulting foam to a substrate. A pumpable cementitious slurry is formed, the slurry is mixed with a gas such as air, and is subjected to mechanically created turbulence to generate gas bubbles and create a foam, which preferably is stabilized by a foam stabilizing agent such as polyvinyl alcohol present in the slurry. The foam is then conveyed to a nozzle or other suitable dispense point from which it is applied, for example sprayed, preferably uniformly, onto a substrate to be coated. Prior to dispensing, a set accelerator is preferably injected, which causes the foam to gel, which in turn improves the hangability of the product on a substrate. The spray material adheres to the substrate and hardens to form an insulative coating on the substrate. Also disclosed are dry compositions comprising a hydratable cementitious binder, a mechanical foam stabilizing agent, and optionally a fibrous component, set retarder and air entraining agent, said composition providing, on the addition of water, gas and mechanical turbulence, a settable foam which is capable of spray application to a steel structural member and which, after spray application, is adherent to the member in the foamed state and after setting. The foam after setting, forms a fire and heat protective adherent coating on the member.
摘要:
Le Liant ettringitique selon l'invention comprend des sulfates de calcium et un composé minéral d'aluminates de calcium, le composé minéral d'aluminates de calcium comprenant des oxydes de calcium C et d'aluminium A, solubles et combinés en une ou plusieurs phases minéralogiques cristallisées et/ou amorphes, dans des proportions telles que :
le rapport molaire C/A utile du composé minéral d'aluminates de calcium est compris entre 1,2 et 2,7 ; la somme en poids des phases (C+A) utiles représente au moins 30% du poids total du composé minéral ; le rapport molaire sulfate de calcium/oxyde d'aluminium a dans le liant ettringitique est compris entre 0,5 et 2.
摘要:
Es wird eine Trockenmischung für einen Luftkalkputz beschrieben, der eine erhöhte Frostbeständigkeit und Härte aufweist. Zu diesem Zweck enthält eine Grundmischung aus Luftkalk, insbesondere Kalkhydrat, und Sand einen Gehalt an Hüttensandmehl.
摘要:
A mixture is used in conjunction with water is used for preparing a slurry that hydrates to form an exterior gypsum cement. The mixture includes 30-70 % by weight hydraulic cement, 30-70 % by weight calcined gypsum and 0.05-2.5 % polycarboxylate. When the mixture is added to water less than 40 weight % based on the weight of the mixture, a slurry is formed that expands very little while it cures.
摘要:
A composition is disclosed for a mixture to be used in conjunction with water for preparing a slurry that hydrates to form a high strength flooring compound. The mixture includes from about 50% to about 98% by weight calcium sulfate hemihydrate, having at least 25% of the calcium sulfate hemihydrate in the beta-calcined form. A polycarboxylate dispersant is included in the mixture in amounts from about 0.2% to about 10% by weight. The mixture also includes 0.05-50% by weight enhancing component. When combined with recommended amounts of water, a slurry is formed that is useful as a flooring composition.
摘要:
The invention relates to a method of foaming a pumpable and sprayable composition a hydraulic binder, polyvinyl alcohol and a set retarder and conveying an aqueous slurry of said foamable composition through a hose to foam said composition (Fig.4); and the dry composition for making same.