255 results about "Calcium sulfoaluminate" patented technology

Disclosed are a high-performance expansion cement clinker, a manufacturing method of the cement clinker, a series concrete expansion agent and a manufacturing method of the concrete expansion agent. The high-performance expansion cement clinker is made as follows: firstly, 50-90 wt% of limestone, 1-20 wt% of bauxite, 5-30 wt% of gypsum and 1-5 wt% of iron powder are grinded together into raw meal, then the raw meal is calcined at 1250-1400 DEG C in a rotary kiln, a tunnel kiln or a roller kiln to get the cement clinker. The cement clinker is milled alone or in combination with sulfur calcium aluminate cement clinker, calcium aluminate cement clinker, anhydrite, calcined gangue, alunite, calcined kaolin and hydration heat inhibiting additives until the specific surface area reaches 200-400m2/kg, so as to get the series concrete expansion agent. The high-performance expansion cement clinker disclosed in the invention is calcium hydroxide-hydrated calcium aluminate sulfate double-expansion source expansion clinker, which is fast in expansion rate and high in expansion efficiency and uses less bauxite of scarce resources; besides, the calcination temperature is low to avoid calcium oxide dead burning, so the preparation is safe and reliable.

The invention relates to the technical field of building material, in particular to a maritime work concrete corrosion-proof additive. The maritime work concrete corrosion-proof additive consists of a calcium sulphoaluminate expansion agent, a methyl naphthalene sulphonic acid water reducing agent, organosilicon hydrophobic powder, neopentylene glycol, milled slag powder, polypropylene fibers, silicon ash, superfine fly ash and arenaceous quartz. The maritime work concrete corrosion-proof additive can reduce the water consumption for mixing concrete, improve the water retention and cohesiveness, and improve the resistance of the concrete to seawater erosion and the durability.

A freeze-thaw durable, dimensionally stable, geopolymer composition including: cementitious reactive powder including thermally activated aluminosilicate mineral, aluminate cement preferably selected from at least one of calcium sulfoaluminate cement and calcium aluminate cement, and calcium sulfate selected from at least one of calcium sulfate dihydrate, calcium sulfate hemihydrate, and anhydrous calcium sulfate; alkali metal chemical activator; and a freeze-thaw durability component selected from at least one of air-entraining agent, defoaming agent, and surface active organic polymer; wherein the composition has an air content of about 4% to 20% by volume, more preferably about 4% to 12% by volume, and most preferably about 4% to 8% by volume. The compositions are made from a slurry wherein the water/cementitious reactive powder weight ratio is 0.14 to 0.45:1, preferably 0.16 to 0.35:1, and more preferably 0.18 to 0.25:1. Methods for making the compositions are also disclosed.

The invention relates to a coal mine gas extraction hole sealing material. The coal mine gas extraction hole sealing material comprises, by mass, 60-80% of ordinary portland cement, 15-25% of an expanding agent (such as calcium sulphoaluminate and calcium sulphoaluminate-calcium oxide), 0-10% of gypsum, 0.1-0.3% of a foaming agent (such as solid aluminum powder or liquid hydrogen peroxide producing gas in an alkaline environment), and 0.2-0.5% of caustic soda, and the above materials and water are blended according to a mass ratio of 1: 0.6-1. The coal mine gas extraction hole sealing material has good expansibility, has an expansion coefficient greater than 10%, compressive strength greater than 10Mpa, good fluidity and short solidification time, is convenient for use and has a low cost.

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 discloses a concrete compaction anti-cracking agent which comprises 20.0-60.0% of light calcined magnesia, 10.0-30.0% of calcium oxide-calcium sulfoaluminate double-expansion source expanded clinker, 5.0-15.0% of gypsum and 20.0-50.0% of a fine powder material of which the specific surface area is greater than 300m<2>/kg, wherein the sum of the contents of all components is 100% based on the total mass of the concrete compaction anti-cracking agent. The concrete compaction anti-cracking agent can be used in concrete to effectively inhibit shrinkage of the concrete and improve the compactness and the durability of the concrete.

The invention discloses calcium sulphoaluminate-Relit composite mineral phase cement and preparing method, which is characterized by the following: adopting coal ash, alumina, limestone and plaster as raw material and fluorite as mineralizer; designing MG and MS value; introducing new Relit mineral in the preparing course of common aluminium sulfate cement; preparing new clinker of new calcium sulphoaluminate-Relit composite mineral phase cement under 1200-1330 deg.c with 45%-65% C4A3S, 20%-36% C3S and residual C2S.

The invention discloses a modified concrete expansive agent, made from, by weight, 10-20 parts of calcium silicoaluminate, 25-30 parts of calcium sulfoaluminate, 20-25 parts of sulfur fixing waste residue, 10-20 parts of modified red clay, 1-5 parts of tourmaline powder, 6-8 parts of iron slag, 4-6 parts of modified calcium oxide, 4-6 parts of magnesium oxide, 3-5 parts of sodium methyl silicate, 2-4 parts of calcium formate, 0.1-0.3 part of azodicarbonamide, 0.4-0.7 part of maltodextrin, 1-4 parts of sodium lignin sulfonate, 0.3-0.6 part of polyglycol ether, 1-3 parts of a polycarboxylate superplasticizer, 2-5 parts of modified diatomite powder, and 0.5-0.8 part of nano calcium carbonate. The modified concrete expansive agent has the advantages of high strength, good compensating capacity and the ability to control calcium oxide reaction and is a promising concrete admixture.

The invention relates to low-shrinkage ultra-high performance concrete, which is prepared from the following raw materials in parts by weight: 800 to 900 parts of a special composite cementing material; 50 to 80 parts of silica fume; 200 to 250 parts of I-grade fly ash; 140 to 160 parts of copper-plated steel fibers; 15-20 parts of a water reducing agent; 1000 to 1100 parts of quartz sand; 160-180parts of water. The special composite cementing material is prepared by uniformly dry-mixing the following raw materials in parts by weight: 75-85 parts of Portland cement clinker powder; 10 to 20 parts of expansive high-belite calcium sulfoaluminate cement clinker powder; 5-10 parts of anhydrite powder. According to the invention, the UHPC self-shrinkage value is small; and the 7d self-shrinkage value ranges from 300 ppm to 350 ppm, the later cracking risk of the UHPC material is reduced, component deformation is reduced, the ultrahigh strength and durability are achieved, the 1d compressive strength reaches 60 MPa to 70 MPa, the 28d compressive strength reaches 160 MPa to 180 MPa, the liquidity is good, and the preparation cost is reduced.

The present invention is related to the process and composition for the manufacture of cement expansion additive. The process comprises a blending step, a reaction step, and a calcination step. The blending step is to incorporate soluble calcium sulfate, soluble calcium oxide, and soluble aluminum compounds such as aluminum dross. The addition of water with the above incorporated materials to from ettringite is so-called reaction step. The calcination step is to calcine the products which are produced from reaction step at a temperature range between 60° C. and 900° C. by transforming ettringite from amorphous to calcium sulfoaluminate respectively. After calcinations, the final products can be used as expansive additives for cement or concrete. Further, this manufacturing method can effectively decrease raw material cost and production cost due to the raw material coming from recycling and no need to calcine at high temperature than other relative arts.

The invention discloses calcium sulphoaluminate or calcium sulphoaluminate-calcium oxide full-clinker concrete expanding agents as well as a preparation method thereof and application thereof in improving shrinkage resisting performance of concrete. A material formula of the expanding agents comprises the following components in percentage by weight: 40wt%-90wt% of limestone (calcium carbonate), 5wt%-50wt% of anhydrite and 2wt%-20wt% of alumina; moreover, limestone not lower than 20wt% (20wt%-100wt%) is replaced by calcium oxide (quicklime), and a calculation coefficient of the limestone replaced by the calcium oxide (quicklime) is 1.785 in mixture calculation, i.e., one part of calcium oxide used is equivalent to 1.785 parts of calcium carbonate. According to the invention, rotary-kiln industrial production of calcium sulphoaluminate or calcium sulphoaluminate-calcium oxide full-clinker concrete expanding agents is realized; moreover, expansion performance is improved, manufacturing cost is remarkably lowered, and application prospect is broad.

The invention provides a belite-calcium sulphoaluminate-ferrite (BCSAF) cement composition comprising: a BCSAF clinker which clinker has the following mineralogical composition, based on the total weight of the clinker: 5 to 25%, preferably 10 to 20%, of a calcium aluminoferrite phase having the general formula C2AxF(1-X), wherein X is from 0.2 to 0.8; 15 to 35% of a calcium sulphoaluminate phase; 40 to 75% of belite (C2S); from 0.01 to 10% in total of one or more minor phases selected from calcium sulphates, alkali metal sulphates, perovskite, calcium aluminates, gehlenite, free lime and periclase and/or a vitreous phase; and an alkanolamine.

The invention provides an anticorrosion high-belit sulfoaluminate cement clinker and a preparation method thereof, anticorrosion high-belit sulfoaluminate cement and a preparation method of the cement, and relates to the field of building material. The anticorrosion high-belit sulfoaluminate cement clinker comprises the following mineral components by the weight percentage: 12%-30% of anhydrous calcium sulfoaluminate, 9.04%-35% of tetracalcium aluminoferrite, 37%-49% of dicalcium silicate, 6%-26% of calcium sulfate and 0.5%-4.1% of free calcium oxide. The anticorrosion high-belit sulfoaluminate cement clinker is used in cement to alleviate the technical problems of poor seawater erosion resistance and poor corrosion resistance of conventional cement used in marine environments, has the advantages of high early strength and easy construction, and can be used for preparing high-corrosion-resistant marine cement concrete for marine environments.

The invention relates to a premix of a grouting material. The premix is characterized in that the premix comprises the following components, by weight, 65-90% of ordinary portland cement with the strength level of 42.5MPa or low alkaline cement with the strength level of greater than 42.5MPa, wherein the water demand for normal consistency is less than 25%, and the tricalcium aluminate content is lower than 8%; 2-29.696% of an ultrafine mineral admixture with a specific surface area of greater than 450m<2>/kg, a water demand ratio of less than 95%, and a 28d activity index of greater than 90%; 5-15% of calcium sulphoaluminate; 0.1-1.5% of a melamine water reducer; 0.002-0.2% of a cellulose polymer, an acrylic polymer or polyoxyethylene; 0.1-1.0% of a carbohydrate, a hydroxycarboxylic acid compound and salts thereof, a sulfate, a carbonate, or calcium formate; 0.002-0.1% of vinyl acetate-ethylene copolymerized rubber powder; and 0.1-1.0% of a chromate or a borate.

The invention which relates to a high performance concrete expanding agent belongs to the technical field of expansive cement. The high performance concrete expanding agent is characterized in that the high performance concrete expanding agent comprises, by weight, 40-60 parts of waterless calcium sulfoaluminate, 20-40 parts of calcium sulfate and 10-25 parts of calcium oxide. The high performance concrete expanding agent has the advantages of high expansion energy, good stability, safety and reliability, simple preparation process, low production cost, excellent product performance and the like. The expansion rate of the high performance concrete expanding agent is in harmony with the strength development of concrete, so the expansion rate is fast, the expansion stabilization phase is early, and the expanding agent has good anti-crack anti-seepage functions, thereby the expanding agent is an ideal material for preparing high performance expansive concrete.

The invention discloses low-carbon cement clinker and a preparation method and application thereof.Raw materials for preparing the cement clinker are a silicon-aluminum containing material, limestone and industrial tailings, and the silicon-aluminum containing material is one of or a mixture of low-grade alumina, fly ash, red mud and gangue.The preparation method includes: well mixing the raw materials, and grinding, wherein a requirement on grain diameter after grinding is that screen residue of a 0.08-mm square-hole screen is less than 15%; calcining the raw materials after being ground at calcining temperature of 1150-1350 DEG C for 10-40 min, and cooling to obtain the low-carbon cement clinker.Content of high-activity beta type dicalcium silicate is greater than or equal to 50%, content of calcium sulfosilicate is 5-15%, and content of calcium sulfoaluminate is 15-25%.A finished cement product can be prepared by adding 0.01-10% of gypsum and 0.01-10% of limestone into the cement clinker.According to existing national detection standards, standard mortar of the cement is higher than 30 MPa in 3-day compressive strength and is 60+/-5 MPa in 28-day compressive strength.

The invention discloses an expansive agent for building concrete. The expansive agent comprises, by weight, 10-20 parts of calcium silicoaluminate, 20-25 parts of calcium sulfoaluminate, 20-30 parts of sulfur fixation residues, 15-25 parts of red mud, 10-15 parts of magnesium slag, 4-8 parts of modified calcium oxide, 4-7 parts of magnesium oxide, 3-8 parts of methanesiliconic acid sodium salt, 3-5 parts of triisopropanolamine, 5-8 parts of aluminum potassium sulfate, 0.1-0.3 part of azodicarbonamide, 0.5-0.8 part of sodium citrate, 2-4 parts of sodium dodecyl benzene sulfonate, 0.4-0.6 part of ethylene-vinyl acetate copolymers and 1-3 parts of polycarboxylic acid water reducing agents. The expansive agent has the advantages that the expansive agent is high in strength and excellent in compensation capacity and calcium oxide regulation and control reaction and is a concrete admixture with a great prospect, and the like.

This invention relates to a method for solidifying river bottom sludge. The method utilizes coal slag, quicklime and gypsum to react with water in the river bottom sludge to solidify river bottom sludge. In addition, construction garbage including bricks and concrete chips are utilized as a supporting material to maintain the solidified river bottom sludge for a certain time. Quicklime as an alkali activator can react with SiO2 and Al2O3 in coal slag. The products can further react with gypsum to obtain calcium sulfoaluminate hydrate. The residual products are further subjected to hydration to solidify river bottom sludge. The solidified river bottom sludge can be used as a substitute for concrete blocks to construct road surface of parks.

The invention relates to a method for preparing high-seepage-resistance calcium sulfoaluminate concrete. The high-seepage-resistance calcium sulfoaluminate concrete is prepared by steps: taking calcium sulfoaluminate cement accounting for 17.00%-25.00% of the total weight of concrete, retarder accounting for 0.01%-0.04% of the total weight of concrete and water accounting for 2.55%-5.25% of the total weight of concrete, and mixing for 20-40s; adding aggregates accounting for 65.00%-80.00% of the total weight of concrete, and mixing for 50-70s; and adding water reducing agent accounting for 0.10%-1.00% of the total weight of concrete and water accounting for 2.55%-5.25% of the total weight of concrete, and mixing for 50-70s, wherein the aggregates are proportionally composed of particles of different diameters. Operability of concrete compactness is realized by regulating mass fraction of the aggregates of each grade. The seepage resistance grade of the concrete prepared by the method is higher than P20, and the concrete has excellent seepage resistance and corrosion resistance.

The invention discloses a concrete composite expanding agent which is prepared from the following mixed substances in parts by weight: 35-42 parts of coal ash, 12-15 parts of gypsum powder, 3-5 parts of quick lime, 2-8 parts of alunite and 16-22 parts of calcium sulphoaluminate. The concrete composite expanding agent has the beneficial effects that the admixture amount is low, the expansion rate is more than the expansion rate of UEA (in market) with the admixture amount of 12%, the alkali amount is far lower than the alkali amount of 1.7-2.2% of a U-shaped expanding agent, which is of great significance; as the admixture amount is reduced, the early-stage strength and the later-stage strength are not affected, and the purpose of equivalent substitute for cement is achieved in deed; the concrete slump loss is not increased, and good construction properties are achieved.

The carefully controlled addition of inorganic fillers to calcium sulfoaluminate rapid-setting cements can lead to significant improvement and optimization of its properties. Generally, prior art achieves cement optimization using costly and unstable organic additives. In the present invention, the addition of three inorganic additives such as coal ash, limestone or kiln dust led to appreciable improvement in the properties of calcium sulfoaluminate-containing cements. The addition of coal fly ash led to increased compressive strength and freeze-thaw durability while decreasing shrinkage and autoclave expansion. The addition of limestone was shown to control the compressive strength while not affecting the setting time, and the addition of cement kiln dust was shown to control the compressive strength while increasing the setting time. And finally, the presence of a super plasticizing agent was shown to negatively affect both compressive strength and shrinkage when used in combination with fly ash.

The invention relates to a concrete and a preparation technology thereof. The concrete comprises water, cement, fly ash, mineral powder, straw powder, machine-made sands, natural sands, broken stones,modified recycled aggregates and an additive. An aggregate modification process comprises the following steps: S1, the recycled aggregates are infiltrated with 1-3% acetic acid for 1-2 h to obtain afirst product; and S2, the first product is washed with water, then is added to a slurry prepared from water, calcium sulphoaluminate, cement, fly ash and straw powder, and is wrapped to form a secondproduct with a thickness of 1-2 mm, and the second product is coagulated to obtain the modified recycled aggregates. The preparation technology of the concrete comprises the following steps: 1, adding the cement, fly ash, mineral powder and straw powder to water, and performing uniform stirring to obtain a first mixture; and 2, adding the machine-made sands, natural sands, broken stones, modifiedrecycled aggregates, the additive and the remaining water to the first mixture, and performing uniform stirring to obtain the concrete. The recycled aggregates are used after being modified, so the problem of increase in the dry shrinkage rate and the creep property of the concrete, caused by the self characteristics of the recycled aggregates, is improved.