1138results about How to "Improve volume stability" patented technology

The invention discloses a lightweight high-performance foam concrete, which is composed of the following components in parts by weight: 50 to 60 parts of cement, 20 to 35 parts of mineral slag, 15 to 20 parts of fly ash, 5 to 10 parts of gypsum, 60 to 80 parts of fine aggregate, 2.7 to 7.3 parts of additive, 0.1 to 0.2 part of fiber, 32 to 45 parts of water, and 5 to 25 parts of foam. The invention also discloses a preparation method of the foam concrete. The foam concrete has the advantages of small volume-weight, high strength, low water absorption, and small contraction rate, and has the waterproof and anti-cracking functions at the same time.

The invention relates to a gypsum-cement binding material and a production method thereof. The material contains gypsum binding material, active admixture, alkaline excitant, oagulation accelerator, lime, water-reducing agent, early-strength agent and gypsum hemihydrate. The weight proportions of the components are as follows: 40%-80% of gypsum binding material, 10%-45% of active admixture, 4%-15% of alkaline excitant, 0-6% of coagulation accelerator, 0-1% of early-strength agent, 0-1% of water-reducing agent, 0-5% of lime and 0-10% of gypsum hemihydrate. The production method comprises the following steps: weighing raw materials at the given ratio, mixing all raw materials, and packaging. The inventive gypsum-cement material has high strength, good water resistance and good volume stability; and can be used as masonry cement, cement mortar, gypsum plaster, jointing gypsum and heat-insulating mortar.

The invention relates to compound thermal insulation plastering material for external wall, which consists of a compound cementing material and a lightweight aggregate. The compound cementing material consists of cement, active admixture, lime powder, promoter, surfactant, anti-crack and waterproof agent, water retaining agent, flame retardant, re-dispersible emulsion powder, alkali-resistance fiber and coal flying ash cenosphere; the lightweight aggregate consists of EPS grain and expanded perlite. The invention has the advantages of low density, thermal performance, high strength, good impact resistance, bond strength and low shrinkage. The compound cementing material adopts a plurality of polymeric cementing materials, allows the insulation material to have good bond performance and simultaneously ensures falling and slipping resistance performance. The invention has good water resistance and high softening coefficient. By using cement-based cementing material as main material and organic reinforced material and waterproof component as auxiliary materials, the invention has a hydrophobic rate more than 98 percent and a softening coefficient more than 0.7. The invention can save energy and protect environment. A great deal of industrial waste residue is used in the materials, which can save a great number of energy, realize resource utilization of the waste residue and is in favor of environmental protection.

The invention discloses a special castable for a kiln outlet, which belongs to the field of refractory materials. According to the invention, the special castable comprises the following components in percentage by weight: 8-25% of silicon carbide, 10-30% of andalusite, 20-35% of corundum, 5-15% of spinel powder, 5-10% of zircon mullite powder, 1-5% of zirconium diboride, 1-5% of silicon nitride,5-15% of alumina micropowder, 3-6% of pure calcium aluminate cement, 0.5-1% of explosion-proof fiber and 0.06-0.2% of sodium tripolyphosphate, which is an additive. By using the special castable for the kiln outlet, disclosed by the invention, the phenomenon of poor wear resistance, block falling and the like in the kiln outlet can be effectively improved; the service life of the cement kiln outlet can be largely prolonged; and the special castable for the kiln outlet, disclosed by the invention, has the advantages of high temperature resistance, heat shock resistance, wear resistance, high strength, irreversible micro expansion and the like.

The invention relates to crack self-repairing concrete using aerobic basophilic microorganisms and a preparation method thereof. The concrete contains expanded perlite loading an aerobic basophilic microorganism repair agent, cement, pebbles, sand, silica fume, water, calcium lactate and water reducer. The crack self-repairing concrete has the crack self-repairing function and has heat-preservation and heat-insulation functions, the aerobic basophilic microorganisms serve as a crack repairing agent, calcium lactate serves as nutritional matter for microorganism metabolism, and expanded perlite serves as a carrier of the crack repairing agent. When concrete cracks, water and air enters the cracks so that resting microorganisms can restore the metabolism function, calcium lactate is converted into calcium carbonate precipitate, and accordingly the aims of automatically diagnosing and repairing the concrete cracks, preventing expansion of the cracks and improving concrete impermeability are achieved. The microorganism crack self-repairing concrete serves as a concrete material integrating the functions of crack self-diagnosis and self-repairing, lightweight, heat preservation and heat insulation, and has large research value and application potential.

The invention discloses thermal insulation mortar which comprises the following components in percentage by weight: 20 to 60 percent of caustic calcined magnesia, 1 to 25 percent of fly ash, 5 to 35 percent of thickening time control agent, 0 to 40 percent of enhanced thickener, 1 to 20 percent of kieselguhr, 5 to 35 percent of expanded aggregate, 0 to 5 percent of polystyrene foam particles, 0 to 0.2 percent of polypropylene fiber, 0.5 to 8 percent of water-resisting admixture, and 0 to 2 percent of water reducing agent. The thermal insulation mortar has the characteristics of capability of coagulating and hardening quickly and having strong binding capacity with base materials, good volume stability, capability of producing volume micro-expansion in the process of coagulating and hardening, no crack, no splitting, strong water resistance, ageing resistance, long service life, light weight, and good heat preservation and heat insulation performance, wherein the coefficient of thermal conductivity is 0.05 to 0.30 W/m.k. The thermal insulation mortar has the advantages of no toxicity, odourlessness, zero radioactivity, no harm to human bodies, no pollution to environments, energy conservation, environmental friendliness and low production cost.

The invention discloses sulphoaluminate maritime work cement and a preparation method thereof. The sulphoaluminate maritime work cement comprises the following main raw materials in parts by weight: 50-80 parts of cement clinker, 8.0-20 parts of anhydrite, 0-30 parts of limestone, 0-30 parts of slag, 0.1-0.5 part of water reducing agent, 0.001-0.005 part of air entraining agent, 0.1-0.5 part of retarder and 2-5 parts of silicon powder. The preparation method comprises the following steps of: respectively smashing, grinding and homogenizing the sulphoaluminate cement clinker, the anhydrite, the limestone and the slag; then, burdening at a ratio, and evenly mixing; adding the water reducing agent, the air entraining agent, the retarder and the silicon powder; and mixing and homogenizing to obtain the product. The concrete mixed by the sulphoaluminate maritime work cement has the advantages of small bleeding rate and high slurry viscidity. The slurry has strong covering and supporting action on aggregate. The concrete keeps good homogeneity and has the advantages of hard and quick early strength, continuously-increased later strength, good slurry structure compactness and high volume stability and is convenient to use and operate for constructing.

The invention relates to a high-magnesium moderate heat portland cement, which is characterized in that (1) the contents of MgO and SO3 in the cement are 3.0-6.5% and 1.4-2.2% respectively; (2) the weight percentages of the mineral composition for grinding cement clinker are 35-55% of C3S, 15-35% of C2S, 1-6% of C3A and 10-25% of C4AF; and the content of MgO in the cement clinker is 3.0-6.5%; (3) in the raw materials for calcining the clinker, the contents of MgO, CaO and Fe2O3 are respectively controlled at a certain value within the ranges of 2.5-3.8%, 38.0-42.0% and 3.5-4.5%, and the variation ranges thereof are respectively controlled within plus or minus 0.10%, plus or minus 0.20% and plus or minus 0.15%. The production method of the cement mainly comprises three procedures of raw material milling, clinker calcining and cement grinding, namely, 'two grinding and one calcining'. The concrete made from the cement is characterized by good fluidity, low water requirement, moderate cement heat, high later strength, good durability, microdilatancy performance, and the like; compared with the conventional portland cement and moderate heat portland cement, the high-magnesium moderate heat portland cement is more favorable for realizing high performance of the concrete.

The invention belongs to the field of refractory materials and discloses a preparation method of a fused silica refractory casting material unwetted by an aluminum liquid, which comprises the following step of: enhancing a ground substance by adopting 10-20wt% of white alundum powder, 4-8wt% of calcium aluminate cement, 3-5wt% of hydrated alumina compound binding agent, 4-10wt% of silicon oxide micropowder and 3-6wt% of alumina micropowder, wherein 60-70wt% of fused silica is used as a main material, BaSO4 and Na3AlF6 is adopted as a compound aluminum liquid anti-wetting agent with the addition of 1-6wt%, and additional 0.12wt% of trimeric sodium phosphate and additional 0.03wt% of sodium hexametahposphate are adopted as dispensing agents. The casting material prepared by using the method has high strength, is unwetted by the aluminum liquid, has the highest use temperature of 1000 DEG C and can be used as the refractory materials, such as an aluminum flowing groove of an aluminum smelting furnace and the like.

The present invention discloses a self-compacting concrete for CRTS III plate-type ballastless track filling layer. The concrete is prepared from the following raw materials in parts by weight: 270-350 parts of cement, 0-130 parts of coal fly ash, 0-120 parts of mineral powder, 20-50 parts of an expanding agent, 790-900 parts of fine aggregate, 750-900 parts of continuous gradation coarse aggregate, 20-40 parts specific viscosity modified materials, 5.5-8.5 parts of a specific sustained release controllable polycarboxylic acid water reducing agent and 165-180 parts of water. According to the invention, the specific viscosity modified materials and specific sustained release controllable polycarboxylic acid water reducing agent are used in combination to prepare the specific self-compacting concrete for filling layer with good flowability, strong volume stability, low sensitivity for water consumption, small thixotropic time change, low shrinkage and good longevity, thereby reducing theconstruction difficulty of the CRTS III plate-type filling layer and prolonging the sevice life of the ballastless track structure.

The invention discloses a cement-emulsified asphalt self-permeable grouting material applied to semi-flexible pavement, which comprises 100 parts of cement, 50-150 parts of mineral admixture, 15-40 parts of expansion agent, 0-80 parts of river sand, 0.5-20 parts of water agent, 60-140 parts of water, and 50-150 parts of emulsified asphalt, all of which are parts by weight. The grouting material of the present invention is low in cost, good in fluidity, long in working time, and satisfies the grouting characteristics of self-permeation of slurry; has good interfacial bonding performance with asphalt, and has a certain early strength function; the volume change rate is small, and the degree of delamination is less than 0.3%, with good volume stability; both cationic emulsified asphalt and anionic emulsified asphalt can be used, with a wide range of applications; applying this grouting material to semi-flexible pavement can greatly improve the fatigue life of flexible pavement The shear performance is effectively improved.

The invention discloses low cementitious material self-compacting concrete. Cement is a main raw material in a cementitious material of the self-compacting concrete; and if the cement consumption is high, overhigh concrete shrinkage is easily caused due to overhigh hydration heat of the cement, which is unfavorable for concrete crack control and concrete durability improvement, and problems such as disintegration, bleeding and the like easily occur. An additive XAMC is added into the concrete formula and can adsorb onto surfaces of particles to form a close adsorption layer so as to prevent the particles from flocculating and aggregating to realize the dispersion and stabilization function. Water-washing superfine sand which is rich in resources replaces partial mineral admixture, the low cementitious material self-compacting concrete can meet the basic requirement of high strength concrete by adding the XAMC under the condition of reducing cement consumption, and has obvious thickening and water retaining functions; concrete mixtures do not bleed or disintegrate, the homogenization and workability of the concrete are improved, and the concrete has important significance for saving energy and reducing emission.

The invention discloses a self-compacting concrete and belongs to the technical field of concrete. The self-compacting concrete comprises the following components in parts by weight: 350-400 parts of cement, 54-80 parts of coal ash, 52-60 parts of slag powder, 50-62 parts of expanding agent, 9-13 parts of silica powder, 748-800 parts of mixed sand, 948-1020 parts of macadam, 140-165 parts of drinking water, 0-10 parts of compound additive and high-performance additive being 1-2% of the binding material in mass fraction. The concrete acquired according to the invention has excellent self-compacting property, fluidity, collapse prevention, cohesiveness and separation resistance, and meanwhile, a test proves that the compressive strength after 7 days is about 57MPa and the compressive strength after 28 days is about 70MPa, so that the concrete provided by the invention has higher compressive strength.

The invention belongs to the field of inorganic non-metallic material, and in particular relates to a light aggregate with high strength and high performance and a preparation method thereof. The light aggregate with high strength and high performance is characterized in that the light aggregate is prepared from solid raw materials and water glass solution, and the mass ratio of the water glass solution to the solid raw materials is 0.3-0.8:1, wherein the solid raw materials consist of metakaolin, steel slag, coal ash, mineral slag and foaming agent; each raw material in the solid raw materials by mass percentage comprises: 30 to 99.9 percent of the metakaolin, 0 to 30 percent of the steel slag, 0 to 50 percent of the coal ash, 0 to 70 percent of the mineral slag, and 0.1 to 0.5 percent of the foaming agent; and the sum of the each raw material in the solid raw materials by mass percentage is 100 percent. The method has the advantages of simple process and low production cost; and the light aggregate with high strength and high performance prepared by the method has the characteristic of high cylinder pressing strength.

The invention provides a preparation method of high-volume coal ash ceramsite foam concrete. The preparation method of the ceramsite foam concrete comprises the following steps: putting 38%-50% of a binding material, 29%-40% of ceramsite lightweight aggregates, 0.5%-1.5% of an excitant and 0.12%-0.14% of a fiber into a stirrer, and stirring evenly; simultaneously adding 0.04%-0.20% of a foaming agent and foam which is formed by a part of water in a foaming machine and has the particle sizes of 50-1,000mu m, the residual water and 0.09%-0.15% of a water reducer into the stirrer, and stirring with powder evenly to form slurry; adding the foam into the slurry, stirring evenly, and then pouring into a mold to mold; and demolding to prepare the ceramsite foam concrete of which the density is 300-800kg/m<3>. According to the formula provided by the invention, low-cost coal ashes are taken as a main raw material, and the material cost is reduced; meanwhile, the volume-weight of the concrete is reduced by adding the ceramsite lightweight aggregates with different particle sizes; and the mechanical strength and the stability of the concrete are effectively improved.

The invention belongs to the technical field of building materials, and particularly relates to high-strength concrete mixed with low-temperature rice husk ash, which comprises ordinary Portland cement, low-temperature rice husk ash, slag powder, coal powder ash, broken stones, river sand, water and water reducer. The low-temperature rice husk ash is prepared by burning rice husks at the lower temperature (600 DEG C) and grinding the burned rice husks. The specific surface area of nitrogen adsorption measurement of the high-strength concrete is 55-70m2/g, and the high-strength concrete has ultrahigh pozzolanic activity. By means of the high-strength concrete, the problem of rice husk processing can be solved, and the production cost of the high-strength concrete can be reduced. The high-strength concrete has the advantages of high workability, high strength, rapidity in strength development, mechanical property, durability and the like by being prepared from the ordinary Portland cement serving as cementing materials, the low-temperature rice husk ash, the slag powder and the coal powder ash serving as admixture, and the broken stones and the river sand serving as aggregate and the high-efficiency water reducer. Reusability of the rice husks is effectively realized by the aid of the high-strength concrete so that energy saving, emission reduction and environmental protection are achieved. Besides, production cost of the high-strength concrete can be reduced, and economic returns are improved.

Characters of bipolar plate of polymer based composite material are that it is produced from materials of Meta kaolin, conductance material, and solution of water glass. The conductance material is composed of graphite and carbon fiber. Doping quantity of graphite is 20-40% of mass of meta kaolin, and doping quantity of carbon fiber is 10-20%. Mass ratio between solution of water glass, meta kaolin, and conductance material 0.4-0.8:1. The said Meta kaolin is obtained by calcinating kaolin in coal series sold on market or pure kaolin at 600-850 deg.C. Modulus m of solution of water glass is equal to 2.8-3.5, and Baume degree is equal to 35-45. Features of the bipolar plate are: low cost, good corrosion resistance, high mechanical strength, light weight, good conductivity, no poison and pollution on fuel cell of proton exchange membrane.

The present invention discloses a special high strength grouting material for connecting a reinforcement sleeve. The special high strength grouting material for connecting the reinforcement sleeve comprises grouting material powder and water, wherein the grouting material powder is prepared from the following raw materials in percentage by weight: 45% to 50% of cement, 0.1% to 0.3% of a water reducing agent, 0.06% to 0.1% of a defoamer, 1% to 3% of a water retention tackifier, 0.025% to 0.05% of a composite retarder, 1% to 2% of a composite expansion agent; and and the balance of quartz sand, totalling 100, wherein the mass ratio of the grouting material powder to the water is 1 to (0.23-0.28). The special high strength grouting material for the connecting reinforcement sleeve provided by the present invention has the characteristics of high strength, high adhesion and slight expansion with no shrinkage; the high strength grouting material can be poured into the reinforcement sleeve to enable fixed connection formed between reinforcements and between the reinforcements and the sleeve, and has excellent durability.