64results about How to "Improve early compressive strength" patented technology

The invention discloses a novel liquid silicon anti-channeling cement slurry used in well cementation, which includes following raw materials, by weight, 95-105 parts of G-grade cement, 10-35 parts of a strength stabilizer, 0.5-4 parts of a retarder, 0.1-0.2 parts of a defoaming agent, 5-15 parts of a filling agent, 0.5-2 parts of a dispersing agent, 100 parts of water, 5-15 parts of an anti-gas channeling agent, 5-10 parts of a fluid loss agent and also a density adjusting agent. The raw materials are mixed and stirred uniformly to prepare the novel liquid silicon anti-channeling cement slurry. The anti-channeling cement slurry is low in water loss, is good in stability, is short in static gelatinization transition time, is strong in anti-gas channeling performance, is quick in early strength development at a low temperature and resists corrosion of acidic mediums. Set cement slurry is slight in expansion, is less in porosity, is high in compactness and low in permeability, and can satisfy requirements in various well cementation situations.

The invention relates to a green alkali-free liquid concrete setting accelerator and a preparation method thereof, and belongs to the technical field of concrete processing. According to the method, aluminum sulphate, calcium hydroxide, organic acid and deionized water are taken and are charged into a three-opening flask; stirring is performed under the condition of constant-temperature water bath; setting accelerator mother liquid is obtained; sodium fluoroaluminate is taken and is added into the deionized water; heating and stirring are performed; then, organic alcohol amine is added; continuous stirring is performed; then, the setting accelerator mother liquid is dripped; after the dripping is completed, ethylene diamine tetraacetic acid is added; heat insulation stirring is performed;after the materials are cooled to the room temperature, stabilizing agents are added; stirring is performed; the green alkali-free liquid concrete setting accelerator is obtained. The setting accelerator provided by the invention has the advantages of no alkali, non-toxicity, no smell and no corrosion; the environment is protected in the construction process; almost no harm is caused on the body health of construction personnel and ecological environment in the spraying process; the production process is simple; the preparation is easy; the storage is easy; the stability in the storage processis high.

The invention provides a shotcrete additive and a spraying technology of shotcrete. The shotcrete additive comprises: 15-25 parts of a setting accelerator, 50-80 parts of a reinforcing agent, 1-5 parts of a dispersant, and 0.1-6 parts of a flocculating agent. The invention also provides a spraying technology of shotcrete. The technology employs the above shotcrete additive and utilizes an existing dry shotcreting machine under a coal mine for wet shotcreting operation. Therefore, the problems that existing dry shotcreting additives cannot satisfy the technological requirements of wet shotcreting as well as dry shotcreting technologies have a high dust concentration can be solved.

The invention relates to a low-temperature early-strength corrosion-resistant cement paste system for deepwater cementing. The system consists of the following components in part by weight: 100 parts of cement, 20 to 100 parts of density regulator, 0.3 to 0.6 part of retarder, 0.1 to 5 parts of fluid loss agent, 0.1 to 3 parts of early strength agent, 0 to 0.6 part of dispersant, 5 to 30 parts of heat regulator and 60 to 120 parts of water. 100 weight parts of cement contains the following components in part by weight: 20 to 70 parts of CaO, 20 to 60 parts of Al2O3, 5 to 20 parts of SiO2, 10 to 35 parts of P2O5, 0.5 to 5 parts of Fe2O3 and 1 to 4 parts of MgO. The cement paste system has excellent low-temperature early-strength, corrosion-resistant, thickening time-adjustable and 'right angle thickening' properties, and is expected to solve the main problems of low temperature, set cement corrosion, shallow water-gas channeling and the like that the deepwater cementing faces. The system is reliable in technology and low in cost, is convenient to construct on site, and is particularly suitable for low-temperature, corrosion and shallow water-gas channeling cementing operations under deepwater conditions.

The invention discloses concrete and a preparation method thereof, and belongs to the field of building materials. The concrete comprises the following raw materials in parts by weight: 280-360 partsof low-heat composite cement, 45-65 parts of II-level coal ash, 45-65 parts of mineral powder, 33-45 parts of silica fume, 480-540 parts of machine-made sand, 200-240 parts of natural sand, 910-940 parts of stones, 60-80 parts of reinforced fibers, 20-25 parts of modified calcium carbonate, 12-16 parts of a water reducing agent, and 180-200 parts of water. The reinforced fibers comprise at least one of glass fibers, tempered fibers and basalt fibers. The water reducing agent comprises at least one of a polycarboxylic acid water reducing agent, a hydroxycarboxylate water reducing agent, and a naphthalene water reducing agent. The provided concrete has the advantages of effectively reducing hydration heat of the concrete, and improving compressive strength of the concrete.

The invention discloses modified desulfurization ash for cement and concrete and a preparation method of the modified desulfurization ash. The modified desulfurization ash for cement and concrete is prepared from desulfurization ash and an oxidizing agent through mixing at normal temperature, wherein the oxidizing agent comprises the following components by weight percentage: 70-80% of manganese dioxide, 5-10% of acetic acid and 10-25% of desulfuration residue, the conversion rate of CaSO4.2H2O in the modified desulfurization ash is 95-98%, the mixing amount of the modified desulfurization ash in cement and concrete is 5-25% (by weight percentage). The modified desulfurization ash has early compressive strength improved remarkably when being added into the cement and the concrete, has the compressive strength hardly reduced after being solidified completely, and has little swelling stress.

The invention relates to well cementing slurry capable of preventing CO2 and H2S corrosion. The well cementing slurry comprises water and cement, wherein the mass ratio of the water to the cement is (0.40-0.50):1, and the cement comprises G-grade high-sulfate-resistance oil well cement, micro-cement, a dispersing agent, a fluid loss agent, micro-silicon, fly ash, an expanding agent, latex, water-soluble resin, an early strength agent, retarder and a defoaming agent. The well cementing slurry is excellent in CO2 and H2S corrosion resistance, capable of effectively resisting the corrosion of CO2 and H2S, capable of protecting underground tools such as sleeves to the maximum degree, and especially applicable to the well cementing of a high-CO2 and high-H2S acid oil-gas field.

The invention discloses a muddy soil cement grout and a composite additive applied to a vertical shaft part of a pedestrian underpass in a saturated soft clay region. A large number of indoor orthogonal tests show that the compression resistance and the shear resistance of muddy cement soil can be greatly improved by adding a plurality of composite admixtures and composite additives into Wenzhou soft cement soil of which the main component is muddy soil. The finding has great significance for constructing the vertical shaft part of the pedestrian underpass in an urban water-rich soft soil region. On the basis of the large number of indoor orthogonal tests, a new economical soft soil reinforcing formula of the vertical shaft part in the water-rich soft soil region, which is constructed by a shallow tunneling method, is found. By the pre-grouting method using the new formula, the geological conditions of the water-rich soft soil shallow-buried soil layer can be effectively improved and the smooth completion of constructing the pedestrian underpass by the shallow tunneling method is reliably guaranteed.

The invention discloses liquified cement paste which can be stored. The liquified cement paste comprises 100 parts of cement, 0 to 70 parts of a light-weight additive, 0 to 50 parts of a weighting agent, 0 to 70 parts of an intensifier, 30 to 150 parts of water, 0.5 to 5 parts of a suspension stabilizer, 2 to 10 parts of a hydrate inhibitor and 0.3 to 2 parts of a dispersant. The storage period of the liquified cement paste which can be stored is 3 months; the density of the cement paste can be controlled between 1.30g/cm<3> to 2.10g/cm<3>; the cement paste is applicable for various well temperatures. By using a stimulator and an average retarder, the thickening time can be controlled between 1 and 72 hours; the early compressive strength of the cement paste is high with the 24 hour-strength of more than 14MPa; the cement paste is stable and reliable; the properties of the cement paste are basically kept unchanged before and after the cement paste is stored; other properties of the cement paste such as the fluid loss property, the rheological property and so on can be adjusted to meet the requirement of application by using well cementation additives.

The invention discloses a high-temperature silt stabilizing agent which comprises the following components in percentage by mass: 30-60% of blast-furnace slag powder, 15-35% of fly ash, 10-20% of quick lime, 6-10% of a gelatinizing agent, 5-10% of phosphorus gypsum, 1-8% of a flocculating agent, 1-8% of an excitant and 1-5% of an enhancer. The high-temperature silt stabilizing agent is capable of effectively reducing the moisture content of silt, high in stability and short in curing time. The invention further discloses a preparation method of the high-temperature silt stabilizing agent.

The invention relates to an oil well cement chlorine-free coagulation accelerating early strength agent, which consists of the following components in parts by weight: 1.0-2.0 parts of sulfate, 0.05-0.10 part of triethanolamine, 0.05-0.10 part of formamide, 1.0-2.5 parts of calcium formate, 0.5-2.0 parts of urea and 0.5-1.0 part of naphthalene sulfonate, wherein the suitable temperature of the coagulation accelerating early strength agent is 20-45 DEG C; the coagulation accelerating early strength agent can be applied to cement slurry systems of various densities, has high compatibility with various additive systems and does not have influence on cement slurry performance; a product designed by the invention does not contain any chloride; the cement slurry thickening time can be shortened; the cement slurry stability is improved; the cement stone early strength is improved; the critical time is shortened; thus, water channeling after well cementation is effectively prevented; and the early strength agent can be matched with corresponding additive and admixture for use and can be widely applied to low-temperature shallow wells and adjustment well cementation construction.

The invention discloses a preparation method of phosphogypsum slag-based cement. The method comprises the following steps: 1, carrying out neutralization reaction treatment on phosphogypsum by using lime; step 2, drying, dehydrating and grinding the prepared phosphogypsum; and 3, uniformly mixing the prepared phosphogypsum with ultrafine blast furnace slag, a Portland cement clinker and a coagulant according to a mass ratio of (15-20%):(75-85%):(1-5%):(1-2%) to obtain the phosphogypsum slag-based cement material. Compared with the prior art, the method has the advantages of turning waste intowealth, being economical and environmentally friendly and the like, and is simple in preparation process, easy to operate and low in cost. The prepared phosphogypsum slag-based cement is high in compressive strength, short in setting time, low in cost, energy-saving and environment-friendly, and has a wide application prospect.

The invention discloses a method for preparing a geopolymer from stone coal vanadium extraction acid-leaching residues. The method comprises steps as follows: grinding balls and the stone coal vanadium extraction acid-leaching residues are added to a stirring mill, water is used as an ore grinding medium, ore pulp is taken out after stirring activation is performed for 0.5-4 h, and activated residues are prepared after filtration and drying; the activated residues are evenly mixed with an activating agent, metakaolin and filler, and a mixture is obtained; an liquid alkali activator is added to the mixture with the mass ratio of the liquid alkali activator to the mixture being 0.7-1.4 and evenly mixed, and mixed mortar is prepared; the mixed mortar is poured into a mold, and a sample is obtained after vibration molding; the sample is sealed for maintenance at 30-80 DEG C for 3-12 h, demolded and left to stand at the room temperature for 1-4 d, and the geopolymer is obtained. The stone coal vanadium extraction acid-leaching residue activation process is simple, low in alkali consumption, low in cost and environment-friendly, the activity of tailings is high, and the prepared geopolymer is high in early compressive strength, high in sulfate corrosion resistance and high in thermal stability.

The invention discloses cement slurry with toughness and a preparation method and application thereof. The cement slurry with toughness is prepared from the components in parts by mass: 100 parts of oil well cement, 33-40 parts of a strength stabilizer, 0.3-0.5 part of a dispersing agent, 0.3-0.5 part of a suspending agent, 0.2-3 parts of a thickening time control agent, 2-5 parts of a fluid lossagent, 0.1-0.3 part of an antifoaming agent, 30-60 parts of water, and 1-3 parts of thermosetting phenolic resin; the strength stabilizer is prepared from silica fume and quartz sand, and the mass ratio of the silica fume to the quartz sand is (3 to 7) to (30 to 33); and the thermosetting phenolic resin is A-stage liquid phenolic resin with the molecular weight of 300-1,000 or B-stage partial cured phenolic resin with the molecular weight of 2,000-5,000. Set cement formed by the thickening of the cement slurry has high strength, low elastic modulus and low permeability, can meet the requirements of the performance of the cement slurry in gas storage well and gas injection drive oil well cementing construction, and ensures the safety of the cementing construction.

The invention belongs to the technical field of building materials and in particular relates to a method for preparing a concrete enhancer by utilizing nickel slag. The method is characterized by uniformly adding the nickel slag to 5-45wt% of formic acid solution and reacting at 20-80 DEG C for 1-24 hours, thus preparing the enhancer, wherein the mass ratio of the nickel slag to formic acid is (0.5-4.0):1. The method has the obvious advantages that after the enhancer is mixed in concrete according to 1.0-5.0% of the mass of cement or cementing materials, the early compressive strength of the concrete can be obviously improved, and the later compressive strength is also greatly improved; the enhancer can be widely applied to Portland cement-based materials such as slurry, mortar and concrete; the method is simple in formula and production process and is easy to popularize and apply.

The invention provides an eco-friendly pavior brick and a preparation method thereof, and relates to the technical field of pavior brick production. The pavior brick comprises a surface layer and a base layer, wherein the surface layer is prepared from, by weight, 15-27 parts of cement, 15-30 parts of grit, 5-7 parts of macadam, 30-40 parts of industrial waste cinder granules, 12-16 parts of waste ceramic particles, 3-6 parts of silica fume, 5-10 parts of coal ash, 3-10 parts of lime, 2-4 parts of air-entraining agents, 1.5-2.5 parts of waterproof agents, 0.3-0.5 part of antifreezing agents, 0.4-0.6 part of water reducing agent, 0.3-0.5 part of pigment powder and 1-3 parts of water; the base layer is prepared from, by weight, 16-18 parts of cement, 18-22 parts of grit, 17-25 parts of macadam and 2-3 parts of water; the preparation method includes the steps of (1) the preparation of surface layer ingredients, (2) preparation of base layer dosing, (3) molding, demoulding, stacking and maintaining; the eco-friendly pavior brick and the preparation method thereof solve the problems of unavailable recycling of wastes, poor heat insulation property, low water permeability and freezing resistance, a bad effect of reducing water and low compressive strength in the prior art.

The invention provides a cementing material with low-temperature resistance and a preparation method. The cementing material is prepared from sulphoaluminate cement clinker, anhydrite, monomineral anhydrous calcium sulphoaluminate, dihydrate gypsum and other additives. The cementing material disclosed by the invention adopts a sulphoaluminate clinker-anhydrite-anhydrous calcium sulphoaluminate-dihydrate gypsum quaternary system, so that the development of the strength of the cementing material at negative temperature is facilitated. The cementing material disclosed by the invention is subjected to hydration reaction at negative temperature to generate an ettringite crystal phase, so that the cementing material has excellent early compressive strength, and the cementing material is suitablefor construction in a low-temperature environment in winter. According to the formula of the cementing material, the problem of poor hydration performance in a negative temperature environment is effectively solved, and the cementing material has excellent negative temperature strength performance. The cementing material is safe, environment-friendly, non-toxic, pollution-free and convenient to operate and has remarkable application value and economic benefit.

The invention relates to a water loss reducing composition, a cement composition containing the water loss reducing composition, and a preparation method and a use of the water loss reducing composition. The water loss reducing composition comprises 55-75 parts by weight of an N-vinyl pyrrolidone-acrylamide copolymer, 28-45 parts by weight of a sulfonated formaldehyde-acetone polycondensate, and 0.7-2.0 parts by weight of an organic amine early strength agent, wherein the N-vinyl pyrrolidone-acrylamide copolymer is prepared through a polymerization reaction of N-vinyl pyrrolidone and acrylamide with the weight ratio of the N-vinyl pyrrolidone to the acrylamide of 1:0.12-1:0.4, and preferably 1:0.2-1:0.3.

The invention relates to the technical field of the concrete repair and in particular to a concrete crack repairing material based on a phosphorus magnesium material and a construction technology thereof. The concrete crack repairing material based on the phosphorus magnesium material is obtained by mixing monoammonium phosphate, magnesium oxide, borax or boric acid, an additive, an admixture andaggregate according to a specific proportion, and in a repairing process of a concrete crack, interface treatment does not need to be performed. The prepared concrete crack repairing material based onthe phosphorus magnesium material has the characteristics of short coagulation time, high compressive strength in early stage, high breaking strength, high bonding strength, low dry shrinkage rate, good durability, high abrasive resistance and the like, and is capable of solving problems in the prior art that cost is high, ageing is easy and service life is short, the material is harmful to a human body in a construction process, the construction technology is complicated, the bonding strength of a bonding surface of old and new materials is low, integrality of a repairing structure is weak,longer maintenance time is needed and the like.

A concrete sensor with a multi-intelligence characteristic comprises the following components in percentage by weight: cement to nano silicon dioxide to slag to sand to water reducing agent to defoaming agent to three-dimensional carbon nano material aqueous dispersion liquid =1:(0.05-0.12):(0.1-0.2):(0.8-1.2):(0.02-0.03):(0.001-0.004):(0.240-0.284), the volume content of steel fibers is 1.0-2.0%,and the volume content is 0.5-1.5%. The invention further provides a preparation method of the concrete sensor with the multi-intelligence characteristic. The problems that intelligent concrete onlyserves as a single performance sensor, and the sensing performance is reduced after the load exceeds the elastic range of the intelligent concrete or the intelligent concrete cracks are solved, and meanwhile the temperature, humidity and load state change of the structure can be stably monitored.