256 results about "Calcium sulfoaluminate" patented technology

The invention discloses a rapid-hardening high-belite calcium sulfoaluminate cement clinker and relates generally to a rapid-hardening high-belite calcium sulfoaluminate cement clinker and methods to use and to manufacture the clinker. The clinker of the present invention comprises 20% to 35% by weight of C4A3S 3% to 9% by weight of C4AF, 37% to 47% by weight of C2S, 0.5% to 4.6% by weight of f-Ca° and 14% to 26.3% by weight of CaSO4. The chemical compositions of the clinker are 12.9% to 16.1% by weight of SiO2, 12% to 19% by weight of Al2O3, 1% to 3% by weight of Fe2O3, 49% to 54% by weight of CaO and 12% to 18.43% by weight of SO3. It is manufactured by calcining, at a temperature of 1300° C.±50° C. in a rotary kiln, the raw meal, comprising 33% to 62% by weight of limestone, 10.5% to 28% by weight of fly ash, and 19% to 45% by weight of FGD gypsum. A group of rapid-hardening high-strength cements of various strength classes can be manufactured by mixing and grinding 26% to 97% by weight of clinker, 3% to 19% by weight of anhydrite and 0% to 55% by weight of granulated blast furnace slag.

To provide a spraying material having an excellent quick-setting property and excellent adherability, a small alkali amount and excellent initial strength development, and a spraying method using it.The spraying material comprises a liquid quick-setting admixture containing an aluminum source, a sulfur source and a fluorine source, one or more quick-setting aids selected from the group consisting of calcium aluminate, calcium sulfoaluminate, calcium aluminosilicate, an alkali metal-containing substance, calcium hydroxide and aluminum hydroxide, and a cement concrete, and the method is to spray this spraying material.

The invention provides a high-strength micro-expansive grouting material and its preparation method. Raw materials of the high-strength micro-expansive grouting material comprise Portland cement having a compressive strength of above 42.5MPa, sulphoaluminate cement or aluminous cement having a compressive strength of above 42.5MPa, a calcium sulphoaluminate expanding agent, quartz sand or corundum or iron tailings, an organic silicon antifoaming agent, a polycarboxylate superplasticizer, calcium formate or lithium carbonate, sodium gluconate, and methyl cellulose ether or hydroxypropyl methyl cellulose ether or hydroxyethyl methyl cellulose ether. Compared with present cement-based grouting materials treating the sulphoaluminate cement and the aluminous cement as main cementing materials, the high-strength micro-expansive grouting material, which is obtained through treating the Portland cement as a main cementing material component, carrying out ultrafine crushing of the cementing material component via an ultrafine crushing technology, and processing, has the characteristics of high early-stage strength, excellent fluidity, increased long-term strength, and good durability; and compared with traditional epoxy mortars, the high-strength micro-expansive grouting material has the characteristics of micro-expansion, simple and fast construction, non-toxicity, and harmlessness.

The invention provides an expansive concrete caisson pile and a manufacturing method thereof, and a concrete expanding agent, and belongs to the technical field of engineering materials and construction of concrete pile foundation. The method comprises the following steps of: alternatively pouring common concrete and expansive concrete into a caisson pile hole sequentially so as to form bamboo joint type I-shaped pile; and pouring slurry at the pile end of the I-shaped pile or the expansive concrete pile so as to form a II-shaped pile or a III-shaped pile. The expanding agent is manufactured by pulverizing 40 to 80 percent of limestone and 20 to 60 percent of gypsum, calcining the powder in a rotary kiln at the high temperature of 1,300 to 1,500 DEG C, and pulverizing 20 to 80 weight percent of the calcined substance and 20 to 80 weight percent of calcium sulfoaluminate cement or alunite or calcium aluminate cement or a mixture of the calcium sulfoaluminate cement, the alunite and the calcium aluminate cement until the specific surface area is 150 to 400 square meters per kilogram. By the method, the manufacturing cost of the expansive concrete caisson pile can be reduced obviously; and compared with the common expansive concrete caisson pile, the expansive concrete caisson pile has the advantage of obviously increasing the bearing capacity of a single caisson pile.

The invention discloses an anti-permeation concrete mixture and a construction method thereof, aiming at solving the problems that an ocean environment contains a lot of chlorine ions, damages to steel bars in concrete and the concrete are caused and the use effect of anti-permeation concrete is influenced. According to technical scheme, the anti-permeation concrete mixture is prepared from the following raw materials in parts by weight: 250 to 420 parts of portland cement, 65 to 80 parts of fly ash, 650 to 850 parts of sand, 1000 to 1080 parts of crushed stones, 5 to 10 parts of a water reducing agent, 13 to 29 parts of a calcium sulfoaluminate expanding agent, 1 to 3 parts of other auxiliary agents and 160 to 190 parts of water; after the anti-permeation concrete mixture is cured, obtained concrete has a relatively good tolerance capability.

The invention relates to a coagulation controllable type cement based pore sealing material and application method thereof. A sulfoaluminate-silicate composite cement system with a certain ratio is adopted, a proper amount of industrial aluminum powder, a high efficient water reducer, and a resin type polymer material is added; an individual grinding technology is adopted, sulfoaluminate cement clinker and resin are grinded together at first so that fine resin particles can be adsorbed on the surface of the mineral particles in sulfoaluminate cement clinker; during the construction process, after the material is contacted with water, the resin wrapped on the surface of the clinker particles reacts with water to form a crosslinking coating film, the hydration of sulfoaluminate minerals is sustained-controlled therefore; the forming speed and forming amount of hydration products such as ettringite (Aft), hydrated aluminate, and the like can be adjusted; the setting time of sealing materials is effectively delayed; the construction becomes convenient, moreover, the sealing material can continuously and slightly expands in the sealed holes, a high early strength is provided for the material, the hydration shrinkage of silicate phase is compensated at the same time, and thus the pore sealing material can be used for a long time.

The invention relates to a sulfo-aluminous clinker with optimal setting time and short term compressive strengths, comprising a mixture of the following phases: —calcium sulfoaluminate, or C4A3$, in amounts higher than 50% by weight of the mixture, —belite, or C25, in amounts between 2 and 23%, —3C25 3C$ CaX2, X being fluorine or chlorine, between 3 and 15% —C11A7CaX2, X being fluorine or chlorine, between 2 and 12%, both fluorine and chlorine being altogether present in the mixture, and phase C5S2$ being absent. The invention also relates to a method for preparing this sulfo-aluminous clinker, and hydraulic binders comprising this clinker.