摘要:
Concrete mixtures for use with air entraining agents and supplementary cementitious materials are achieved using a carbon encapsulating agent. The carbon encapsulating agent can include a nitrilotrisethanol aliphatic soap.
摘要:
A method of producing cementitious mixtures containing fly ash as one of the cementitious components, under air entrainment conditions is described. The method involves forming a mixture comprising water, cement, fly ash, optionally other cementitious materials, aggregate, conventional chemical admixtures, and an air entrainment agent and agitating the mixture to entrain air therein. Additionally, at least one amine sacrificial agent is included in the mixture. The cementitious mixtures and hardened concretes resulting from the method and fly ash treated with sacrificial agent, or air entrainment agent/sacrificial agent combinations, are also described.
摘要:
A polymeric aggregate (10) such as for use in concrete, mortar or road base, wherein the aggregate is produced from ash combined with the activator.
摘要:
A process for treating fly ash to render it highly usable as a concrete additive. A quantity of fly ash is obtained that contains carbon and which is considered unusable fly ash for concrete based upon foam index testing. The fly ash is mixed with a quantity of spray dryer ash (SDA) and water to initiate a geopolymerization reaction and form a geopolymerized fly ash. The geopolymerized fly ash is granulated. The geopolymerized fly ash is considered usable fly ash for concrete according to foam index testing. The geopolymerized fly ash may have a foam index less than 40%, and in some cases less than 20%, of the foam index of the untreated fly ash. An optional alkaline activator may be mixed with the fly ash and SDA to facilitate the geopolymerization reaction. The alkaline activator may contain an alkali metal hydroxide, carbonate, silicate, aluminate, or mixtures thereof.
摘要:
Geopolymeric cements based on aluminosilicate fly ash of class F, which, contrary to the prior art, are harmless to use and harden at ambient temperature, favouring their use in common applications in the construction and civil engineering fields. This harmlessness is achieved thanks to a mixture containing: 10 to 15 parts by weight of a non-corrosive alkali metal silicate solution in which the M 2 O:SiO 2 molar ratio is less than 0.78, preferably less than 0.69, and the SiO 2 :M 2 O ratio is greater than 1.28, preferably greater than 1.45, M denoting Na or K; added to this are 10 to 20 parts by weight of water and 5 to 15 parts by weight of blast-furnace slag having a specific surface area of less than 400 m 2 /kg, preferably less than 380 m 2 /kg and also 50 to 100 parts by weight of class F aluminosilicate fly ash.
摘要翻译:基于F级铝硅酸盐粉煤灰的地质聚合物水泥,与现有技术相反,在环境温度下无害化和硬化,有利于其在建筑和土木工程领域的常见应用。 这种无害化是由于含有10至15重量份的非腐蚀性碱金属硅酸盐溶液的混合物,其中M 2 O 2 SiO 2摩尔比 小于0.78,优选小于0.69,SiO 2 :M 2 O比大于1.28,优选大于1.45,M表示Na或K; 添加了10〜20重量份的水和5〜15重量份比表面积小于400m 2 / kg,优选小于380μm的高炉渣 kg / kg,还有50-100重量份F级硅铝酸盐粉煤灰。
摘要:
An apparatus for processing fly ash comprising a heated refractory-lined vessel having a series of spaced angled rows of swirl-inducing nozzles which cause cyclonic and/or turbulent air flow of the fly ash when introduced in the vessel, thus increasing the residence time of airborne particles. Also disclosed is a method of fly ash beneficiation using the apparatus.