Abstract:
Described herein are compositions that can be used for geopolymer-based concrete manufacturing to be used for capping of mining waste rocks. Also described herein are methods of making geopolymer-based concrete from the compositions and forming a capping cover for mining waste rocks.
Abstract:
The invention relates to a method of handling ash from the combustion of municipal waste, i.e. mixed waste. In the method according to the invention, a cement-based binder composition is created where cement powder is blended with ash from municipal waste, i.e. mixed waste, combustion, i.e. with APC ash. The method also relates to products made by the method and to the use thereof.
Abstract:
The invention concerns a method and a grouting composition for filling cracks in stone and concrete structures. According to the method, the cracks are filled with a composition containing a binder which achieves setting of the composition under the influence of water, whereby the cracks are filled. The grout contains a latent hydraulic binder, an alkaline component for activating the binder, additives and aggregate having a particle size of less than 1.6 mm. The grout is easily formulated to a suitable viscosity determined by the intended use by varying the relative amounts of binder, activator and aggregate. The grouting composition has good anti-wash-out properties, enabling its use for filling even cracks where strong water flow occurs.
Abstract:
The present disclosure is directed to chemical additives for geopolymer cements that can improve the rheological properties of geopolymer cements. These chemical additives include sulfates and selenates of a specific formula as well as hydroxycarboxylic acid salts of Li, Na, and K including but not limited to glycolic, lactic, citric, mandelic tartaric, and malic acids. The chemical additives for geopolymer cements disclosed herein can facilitate the uniform mixing, increase the time mixtures can be transported, and improve the ability to place and finish concrete and mortars made with the geopolymer cements.
Abstract:
본 발명은 급냉 제강환원슬래그 분말을 이용한 수경 결합재 조성물 및 그 제조방법에 관한 것으로, 보다 상세하게는 제철소에서 철 제련 중에 발생되는 부산물 중 전기로 용융환원 슬래그에 고압, 고속가스를 분사, 비산시켜 급냉 처리하여 분쇄한 급냉 제강환원슬래그 분말(RC-LFS Powder)의 초기 높은 수화열 반응 및 초기 응결을 지연시켜 작업성을 확보하고, 침상형의 에트링가이트 생성을 활성화시켜 초기 및 장기강도 발현이 가능하도록 급냉 제강환원슬래그 분말(RC-LFS Powder)에 지연제 및 석고를 혼합 사용하여 보통포틀랜드 시멘트의 대체용으로 사용할 수 있는 급냉 제강환원슬래그 분말을 이용한 수경성 결합재 조성물 및 그 제조방법에 관한 것이다.
Abstract:
Economical heavy concrete weight coating (102) is used as a weight coating for submarine pipes (104). The economical heavy concrete weight coating (102) includes steel slag and iron ore as aggregate. Steel slag can contain iron and thus have a higher density than some other types of slag. By supplementing the steel slag with iron ore as aggregate, the economical heavy concrete weight coating can have a higher density than a coating having just slag. Economical heavy concrete weight coating can have a density greater than 190 pcf.
Abstract:
The subject matter of the invention is an aggregate and/or filler extracted from slag, a method for the production thereof, and the use thereof. According to the invention, a recyclate extracted from metal or metal slag having less than 1% by wt. of free CaO or less than 1% by wt. of nitrides (for almuinium slag) is provided. Said method for producing the recyclate, substantially converts metal slag with additives containing iron sulphate.
Abstract:
A method for producing a hardened slag product, which comprises providing a mixture containing 15 to 55 mass % of a slag from a step of pretreatment of hotmetal having a particle diameter of 1.18 mm or less and 5 to 40 mass % of a blast furnace slag having a particle diameter of 0.1 mm or less, kneading the mixture with water, and then subjecting the kneaded product to curing; and a more suitable method, which comprises providing a mixture containing 15 to 55 mass % of a slag from a process of pretreatment of hotmetal having a particle diameter of 1.18 mm or less, 3 to 36 mass % of a blast furnace slag having a particle diameter of 0.1 mm or less, and 1.5 to 30 mass % of a fly ash, wherein the mass ratio of the fly ash to the sum of the blast furnace slag and the fly ash is 0.1 to 0.75, kneading the mixture with water, and then subjecting the kneaded product to curing. Those methods allow the utilization of a slag from a steel making process and also the production of a hardened slag product having a satisfactory strength and being free from the occurrence of surface cracking. The hardened slag product is useful as a material for subbase course of a road, a building material, a material for a civil work or a substitute for concrete.
Abstract:
Undried blast furnace slag, for example, granulated blast furnace slag having a water content of 3 to 20, generally 5 to 15 %, by weight, is introduced to hot clinker in a cooler downstream of a cement kiln; the water is volatilized or evaporated in the cooler to provide a cement clinker having an effective content of dried blast furnace slag free of water; this permits use of blast furnace slag in a blended cement without the need for separate special steps for drying the slag.