896results about How to "Increase late strength" 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 discloses an additive for pervious concrete. The additive for the pervious concrete comprises a water reducer, a retarder, a viscosity modifier, an entraining agent and water, wherein the mass ratio of the water reducer to the retarder to the viscosity modifier to the entraining agent to the water is (30-50): (1-3): (0.5-3): (0.3-1.5): (42-60). The invention further discloses the application of the additive for the pervious concrete. The additive for the pervious concrete has the advantages that for the application requirement of the pervious concrete, the additive special for the pervious concrete is provided; after the additive is added to the pervious concrete to be used, the fluidity of the pervious concrete can be improved, premature drying and condensation can be avoided, unloading is facilitated, and the durability and the long-term strength of the previous concrete are improved.

The invention relates to a method for preparing novel sulfamic acid high-efficiency concrete water reducing agent, which is carried out according to the steps of: (1) hydroxymethylation: adding formaldehyde with the mass ratio of 3-6 with melamine into melamine solution, adjusting the pH value to be 10-12, and carrying out heat preservation for 1-5h at the temperature of 65-95 DEG C; wherein the formaldehyde is polyformaldehyde or 30-40% of formaldehyde water solution; (2) sulfonation: adding p-amino benzene sulfonic acid sodium with the mass ratio of 1-3 with melamine into the melamine solution treated by hydroxymethylation, maintaining the pH value to be 10-12, and keeping the temperature of 70-85 DEG C for 1-3h; (3) etherification reaction: adjusting the pH value to be 3.5-6, and reacting for 1-6h at the temperature of 70-95 DEG C; and (4) neutralization: adding alkali and adjusting the pH value to be 7-9. The high-efficiency concrete water reducing agent prepared by the method can be separately used when the solid doping quantity is 4%, has the water reducing rate of 24% and increases the later period strength of concrete to be 140%.

The invention relates to an inorganic composite heat insulation material, which is prepared from the following raw materials in part by weight: 100 parts of common silicate cement, 10 to 30 parts of quick hardening sulfate aluminum cement, 10 to 30 parts of gypsum powder, 10 to 40 parts of admixture, 20 to 40 parts of mineral fiber, 150 to 200 parts of vitrified micro bubbles, 4 to 8 parts of re-dispersible latex powder, 2 to 4 parts of cellulose ether, 0.1 to 0.3 part of starch ether, 0.2 to 1.0 part of water reducing agent, 0.2 to 0.6 part of retarder, 1 to 3 parts of early strength agent, 0.5 to 3 parts of water repellent, and 0.02 to 0.06 part of air entraining agent. The raw materials are mixed uniformly to prepare dry powder, and the dry powder and water are mixed in a weight ratio of 1: (0.8-1.2) and stirred to form slurry for use. The inorganic composite heat insulation material has good workability, quick strength development, high construction efficiency, good adhesive property, low drying shrinkage, heat insulation, hydrophobic property, fire resistance and durability.

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 discloses special repair mortar for a structure. The mortar is prepared from the following components in parts by weight: 350-500 parts of common silicate cement, 50-150 parts of sulphate aluminum cement, 100-200 parts of 20-40-mesh quartz sand, 300-350 parts of 41-70-mesh quartz sand, 20-50 parts of montmorillonite, 30-50 parts of a styrene-butadiene rubber latex, 1-10 parts of redispersible latex powder, 1-5 parts of starch ether, 1-5 parts of cellulose ether, 0.5-2 parts of a polycarboxylate superplasticizer, 1-3 parts of a retarder, 1-10 parts of fibers and 1-5 parts of a compound early strength agent. According to the special repair mortar for the structure, by selecting and proportioning the components in proportion, comprehensively excellent utilizing performance of the components, the components draw on strengths of each other and act jointly, so that the shrinking percentage of the mortar is low. Mechanical properties of relatively high bonding strength, tensileand crush resistances and the like are obtained, and the cost performance is high.

A high-activity superfine additive for concrete is prepared from at least two of steel slag, flyash, granular slag of blast furnace and phosphur slag, and gypsum through grinding, proportional mixing and further pulverizing. Its advantages are high specific surface area (more than 400 sq.m/kg), high activity, and low heat release.

The invention relates to 3D printing mortar and a preparation method thereof and belongs to the field of building materials. The mortar is mainly composed of 70-90% of compound cement, 5-20% of quartz sand, 0.2-2% of lime, 1-5% of coagulant, 0-3% of water reducing agent, 0-3% of defoaming agent, 0-0.5% of thickener and 0.2-0.8% of fiber. The mortar can be quickly hardened and is good in thixotropy and flowability, initial setting time can be within 2 min at least, the requirement that the 3D printing mortar is quickly dried and hardened can be met, and later strength is high.

The invention provides graphene oxide ultra-high performance concrete with low cement consumption, which belongs to the technical field of building materials. The concrete comprises the following components in parts by weight: 100 parts of cement, 30-50 parts of silica fume, 60-120 parts of fly ash, 10-50 parts of slag powder, 80-120 parts of quartz sand, 30-50 parts of water, 20-50 parts of steelfiber, 2-10 parts of a water reducing agent and 1-10 parts of graphene oxide. The invention also provides a preparation method of the ultra-high performance concrete. The graphene oxide is compoundedwith the steel fiber concrete doped with the mineral fine powder, and the graphene oxide can promote cement hydration, improve the early and later strength of the concrete, improve the interface conditions of a matrix and steel fibers and improve the binding strength of the matrix and the steel fibers, so that the breaking strength of the concrete is improved. The graphene oxide can improve the pore structure of the concrete, so that the concrete is denser, the strength of the concrete is improved, concrete strength shrinkage caused by steam curing is avoided, and the durability of the concrete is further improved.

The invention relates to a method for controlling the setting time and early hydration speed of magnesium potassium phosphate cement, and belongs to an early strength quick hardening cement cementing material. A composite retarder can effectively adjust the setting time of magnesium potassium phosphate cement slurry, and the setting time of the magnesium potassium phosphate cement slurry can be effectively controlled in the range of 10 minutes to 6 hours by adjusting the content of chloride and disodium hydrogen phosphate dodecahydrate in the composite retarder, so that the problems of a limited retarding effect, low operability and the like are solved; the composite retarder can change the hydration heat release characteristic of the magnesium potassium phosphate cement, the magnesium potassium phosphate cement slurry doped with the conventional retarder borax has a hydration heat release peak at the initial reaction stage and has a high heat release speed and large heat release amount, and the magnesium potassium phosphate cement doped with the composite retarder has two hydration heat release peaks and has small hydration heat release amount at the initial hydration stage; and the doped composite retarder improves the microstructure and later strength of a hardened magnesium potassium phosphate cement body, so that enough construction operable time can be ensured while the magnesium potassium phosphate cement slurry has early strength and is quickly hardened.

The invention discloses a high fluidization micro expansive high-strength grouting material which comprises the following raw materials by mass percentage: 23-34% of cement, 3-5% of microbead, 5-7.5% of phosphorus slag composite powder, 2.5-3.5% of silica fume, 2.5-3.5% of quartz powder, 46-55% of fine aggregate, 0.7-1% of water reducer, 0.01-0.03% of defoaming agent, 2.5-3.5% of expanding agent and 0.5-1% of early strength agent. The grouting material has the advantages of high strength in the early stage and later stage, good flowing property and adjustable expansiveness by taking the cement as a major binding material and employing the silica fume, the microbead and the phosphorus slag composite powder with different hydration activities together with a chemical additive matched with a binding material system and an aggregate system with reasonable gradation, and is particularly applicable to high precision equipment mounting, secondary grouting of an equipment foundation, bolt anchoring, crack repairing, duct grouting and the like.

The invention discloses a water-permeable agent for water-permeable bricks or water permeable concrete and application of the water-permeable agent. The water-permeable agent comprises, by weight, 75-110 parts of water reducing agent, 150-300 parts of retarder, 100-150 parts of binder, 55-70 parts of air entraining agent and 55-100 parts of water. The water-permeable agent has the advantages that the water-permeable agent can increase the workability of a water-permeable layer, increase water permeability and increase the durability and later strength of the water-permeable bricks and is low in adding amount and low in cost. The water-permeable bricks have the advatnages that the bricks use haycite and regenerated porous coarse aggregate as the aggregate of the water-permeable layer and use the water-permeable agent, the features of porosity, good water absorption performance and high strength of the aggregate and the good performance of the water-permeable agent are utilized to increase the strength and water permeability of the water-permeable bricks, and the bricks are lightweight and convenient to carry.

The invention discloses a composite curing agent for dredged silt in a watercourse, comprising a powdered agent and a liquid agent, wherein the powdered agent consists of the following components on the basis of 100 percent of the total mass fraction: 15-25 percent of cement, 45-65 percent of pozzolanic material, 10-20 percent of alkali activator and 5-10 percent of salt activator; and the liquid agent consists of the following components on the basis of 100 percent of the total mass fraction: 2-7 percent of polyvinyl alcohol, 2-7 percent of polyacrylamide, 0.5-1 percent of melamine sulfonate formaldehyde condensate and the balance of water. The dredged silt has high compressive strength after being solidified by the composite curing agent for the watercourse silt, and can meet the requirements of road construction.

The invention relates to putty powder, in particular to functional diatomite putty powder and a preparation method thereof, wherein the putty powder includes in percent by weight: 10-50% of high-temperature activated diatomite, 5-30% of an inorganic binder, 30-70% of an inorganic filler, 0.01-2% of a functional aid, 0.1-5% of an inorganic pigment, 0.5-5% of an organic binder, and 0.5-5% of an organic aid. The functional diatomite putty powder meets the related standard requirements of putty powder and diatomite, and has qualified constructability and functionality, namely having standard-meeting properties such as humidity regulation, formaldehyde clarifying performance, long duration of formaldehyde purifying performance, mold-proof performance, and mold durability.

The invention discloses sea sand anti-corrosion marine concrete. By adjusting the proportion of binding materials, cement, mineral powder, silicon ash and fly ash micro-spheres are uniformly distributed, and adsorption of corrosive ions is increased by hydration reaction of high-aluminum minerals and chemical curing of Cl- ions in sea sand. Transmission paths of the Cl- ions in the sea sand and the corrosive ions in a marine environment can be effectively inhibited by pore structure adjustment and corrosive ion transmission inhibitors, and reinforcing steel corrosion is decreased. Micro-expansion and water retention components in internal maintenance materials can effectively avoid cracking of the inside of the concrete due to excessive shrinkage under the moisture coupling action of a marine environment, and the working performance and the compactness of the concrete can be improved by special ball effects of ultra-dispersed shrinkage additives and the fly ash micro-spheres. The sea sand anti-corrosion marine concrete can effectively solve the problem of river sand resource shortage, resource application of the sea sand is realized, and the sea sand anti-corrosion marine concrete more effectively serves a severe marine environment and has an important engineering application value.

The invention discloses a phosphogypsum-base wall material for a cast-in-place wall. The invention is characterized in that the material is prepared from the following raw materials in percentage by weight: 60-80% of beta-phosphogypsum, 10-20% of mineral admixture, 5-25% of cement, 0.25-0.5% of retarder, 0.05-0.15% of defoaming agent, 0.05-0.2% of thickener and 0.5-1% of water reducer. The raw materials are uniformly mixed to obtain the phosphogypsum-base cast-in-place wall material; and the material and water are mixed uniformly in a water/material ratio of 0.4-0.5 to obtain a slurry, and the slurry is cast in place and molded. The phosphogypsum-base wall material has the advantages of controllable setting time, low flowing loss rate, high utilization ratio of solid waste, low material cost and high strength, is convenient for construction, and can be widely used for frame-structure infilled internal walls of commercial and civil buildings.

The invention discloses a special thin anti-crack plastering mortar for autoclaved aerated concrete and belongs to the technical field of building materials. According to the special thin anti-crack plastering mortar disclosed by the invention, a dry material is added with water by a mass ratio that water to dry material ratio is equal to 1:4, and then stirred for 3-5 minutes to prepare mortar, wherein the dry material consists of the following components in mass by percentage: 20%-35% of cement, 10%-30% of 40-70-mesh quartz sand, 30%-50% of 80-100-mesh quartz sand, 2%-7% of 200-mesh coarse whiting powder, 1.5%-4% of redispersible emulsion powder; 0.15%-0.5% of water-retaining agent; 0.2%-0.7% of wood fiber and 0.11%-0.45% of short fiber. Being prepared by adopting quartz sand of 40-70 meshes or 80-100 meshes, the special thin anti-crack plastering mortar for the autoclaved aerated concrete disclosed by the invention has an excellent anti-crack performance, realizes effective control on contraction percentage of the mortar, causes no cracks during large-area construction, achieves good caking property, and realizes organic combination between the mortar and the surface layer of the autoclaved aerated concrete.

The invention discloses an alkali slag foamed concrete which comprises slag and an alkali activator, wherein the alkali activator is sodium hydroxide or water glass. When the alkali activator is sodium hydroxide, the alkali slag foamed concrete is composed of the following components in parts by mass: 59-65 parts of slag, 5-6% of NaOH, 23-26 parts of water and 4.8-12.2 parts of foaming agent. When the alkali activator is water glass, the alkali slag foamed concrete is composed of the following components in parts by mass: 56-61 parts of slag, 9-11 parts of water glass, 21-25 parts of water and 5.0-12.2 parts of foaming agent. The volume weight of the foamed concrete is 290-610 kg/m<3>. The alkali slag foamed concrete has the advantages of short setting time, quick strength development, higher later strength, excellent water resistance and excellent weather resistance, and can be used for a long time.

The invention discloses a process for preparing concrete by recycling and utilizing PHC pile tube surplus slurry, which comprises collecting the surplus slurry produced by the centrifugation of the PHC pile tube in a ware, then calculating the proportion of the surplus slurry X and calculating solidity Y of the surplus slurry according to the mathematical formula Y=AX-B, and according to the solidity value of original surplus slurry, adding water into the surplus slurry for mixing and diluting into a fixed density or solidity, adding retarder into the surplus slurry and controlling the coagulation time of the surplus slurry in 4-6 hours, then adding the surplus slurry and the row material of commodity concrete into the blender for producing the mixture fitting for the relative strength gradation, and conducting commodity concrete production to the mixture with manufacturing technique of commodity concrete. The process for preparing concrete by recycling and utilizing PHC pile tube surplus slurry enables the effective components of the surplus slurry to be reutilized, which not only reduces the environmental contamination and saves resource, but also substantially improves both the service performance and the early strength and later strength of the produced commodity concrete.