653results about How to "Reduce heat of hydration" 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 phosphate cement based patching material and a preparation method thereof. The patching material is prepared from the following ingredients in parts by weight: 100 parts of magnesium phosphate cement, 20 to 40 parts of mineral admixtures, 120 to 140 parts of fine aggregates, 0.5 to 1 part of water glass, 0.5 to 1 part of fiber and 20 to 30 parts of water. The preparation method is characterized in that the raw materials are proportionally weighed; magnesium oxide, monopotassium phosphate and composite retarders are firstly stirred and mixed; then, the magnesium phosphate cement is obtained; then, the mineral admixtures and the fine aggregates are added; after uniform stirring, the water glass, the fiber and the water are added; stirring is performed for 3 to 4 minutes by a stirring machine; the phosphate cement based patching material is obtained. The prepared phosphate cement based patching material by the invention has the advantages that the coagulation time is about 30 minutes; the restoration time is short; the construction is not influenced; the restoration effect is obvious; the application requirement of fast patching the damaged road surface is met; the phosphate cement based patching material is applicable to fast restoration projects of cement concrete pavements.

The invention relates to a ready-mixed concrete with phosphorus slag powder, which is characterized in that the composition ratio and the weight ratio comprise the following parts: 120-150 parts of cement, 100-250 parts of phosphorus slag powder, 0-120 part(s) of fly ash, 0.5-20 part(s) of water reducing agent, 0-0.5 part of air entraining agent, 0-0.02 part of water retention agent, 50-17000 parts of coarse aggregate, 20-9000 parts of fine aggregate and 100-300 parts of water. The invention takes the industrial waste residue i.e. the phosphorus slag powder as the admixture part of the concrete to replace the cement to dope in the ready-mixed concrete, thereby reducing the use amount of the cement, uses the retarding characteristic of the phosphorus slag to reduce the gelled material cost of the concrete and the manufacture cost the of concrete pumping aid, simultaneously gives full play to the characteristic of the phosphorus slag so as to reduce the hydration heat and the adiabatic temperature rise of the concrete, decreases the elasticity modulus and improves the ultimate tensile strain capacity of the concrete, the strength growth rate is high, and the durability is significantly improved; and the invention can changes the waste into the valuable and turns the harmful into the beneficial.

The concrete hydration heat reducer is compounded with one kind of material selected from starch grafted polyacrylate, hydroxyl acetic acid-lactic acid copolymer, modified starch, polymethylamide, polymethyl formacrylate, polyalkyl acrylonitrile and ethyl cellulose, and through dissolving in water, reaction at 5-55 deg.c, water phase-solid phase separation after reaction to obtain the solid phase concrete hydration heat reducer. The material has molar ratio to water of 1 to 1-50. The product can reduce hydration heat of cement obviously, reduce the early adiabatic temperature raise of concrete, reduce temperature raise rate to lag the peak temperature time by about 6 days, make the concrete possess excellent heat stability, less initial stage temperature stress and less cracks.

The invention relates to a retarding superplasticizer composition for roller compacted concrete, which is prepared from 40-80 percent of barium-containing naphthalene based superplasticizer, 10-30 percent of modified lignosulfonate, 3-7 percent of plastic retaining agent, 5-15 percent of composite retarder, 1-7 percent of layer silicate mineral material, 0.1-0.5 percent of polysiloxane and 0.1-0.2 percent of air entraining agent. The retarding superplasticizer composition does not contain alkali harmful to alkali-aggregate reaction, has a better inhibition effect to the alkali-aggregate reaction, and has the advantages of high water reducing rate, strong VC value retaining capacity, good water retaining property, small bleeding rate, remarkable retarding effect and the like, so that the prepared roller compacted concrete mixture has the characteristics of good workability, small VC value loss, small bleeding rate, long setting time, greatly reduced early hydration heat and delayed occurrence time of a hydration heat peak, so as to have better construction property, mechanical property and durability.

The invention relates to road silicate cement clinker and a preparation method thereof. The preparation method for the road silicate cement clinker comprises the following steps: grinding and roasting a cement raw material, wherein the cement raw material consists of the following substances in parts by weight: 50-85 parts of lime stones, 5-20 parts of steel slag powder, 5-15 parts of sandstones and 5-15 parts of coal ash. The preparation method can be used for recycling the steel slag, grinding the steel slag into powder after drying, and adopting the prepared steel slag powder as a cement production raw material to prepare road silicate cement clinker with low heat and high fracture resistance, so that the sintering quality of the clinker can be effectively improved after the steel slag powder is added. On the basis of meeting the technical requirements specified in the road silicate cement national standards, the road silicate cement clinker can be used for improving the fracture resistance and wear resistance of the cement, and lowering the hydration heat evolution and the dry shrinkage rate.

The invention discloses a method for preparing a rock mass sample with filling fissures. model, and input the three-dimensional digital model into the 3D printer; (2) simulate the actual fractured rock mass to prepare the rock block part for forming the sample and the raw materials for the crack filling, and use water-soluble materials as raw materials to form the sample The above three raw materials were placed in different nozzles of the 3D printer, and a preliminary sample containing the filling was obtained by 3D printing; (3) The preliminary sample was soaked in water to completely dissolve the water-soluble material to obtain final sample. The invention does not need to use a mold to prepare the sample, and the prepared sample contains fillers, which overcomes the defect in the prior art that powdery solid particles cannot be filled into cracks of the sample to form fillers.

The invention relates to an anti-crack and impervious mortar and a preparation method thereof, belonging to the technical field of building materials. The anti-crack and impervious mortar is prepared from the following components in parts by weight: 450 to 650 parts of cement, 250 to 270 parts of water, 1200 to 1500 parts of fine aggregate, 1 to 3 parts of an expansion agent, 1 to 3 parts of an impervious agent, 0.4 to 1.2 parts of fiber and 2.5 to 4.5 parts of a water reducing agent. The mortar prepared by using the method provided by the invention has the following advantages: the workability is good; the setting time of the mortar can be controlled by adjusting the usage amount of an additive; the construction time is convenient to be controlled; the construction is easy; by adding materials like anti-crack fiber, the impervious agent and the expansion agent into the mortar, anti-crack and impervious comprehensive performances of the mortar are improved; the engineering durability is effectively improved; and the preparation method for the mortar is simple and convenient to operate, and can be extensively popularized and applied.

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 designing of the mix ratio of high-performance recycled concrete. Unlike common concrete, the aggregate of recycled concrete has high porosity and water absorption rate, coarse aggregates of different sources are greatly different in performance, and the particle strength and elastic modulus of the recycled concrete are thus low; so it is impossible for usage of a universally accepted strength formula as a base for designing of the mix ratio of the recycled concrete. Although a variety of strength formulas are brought forward at home and abroad, the strength formulas are all limited and cannot be practically applied since the problem of great difference among the performances of recycled aggregates cannot be handled.

The invention discloses foam concrete containing recycled inorganic lightweight aggregate. The foam concrete is prepared from 20-60 parts of cement, 20-60 parts of slag, 0-50 parts of sand, 0.5-3 parts of a water reducer, 0.1-3 parts of fibers, 25-60 parts of water, foam with the addition amount accounting for 1-80% of the total volume of the foam concrete and the recycled inorganic lightweight aggregate with the addition amount accounting for 1-80% of the total volume of the foam concrete, wherein the recycled inorganic lightweight aggregate is obtained by smashing, screening and grading one or more inorganic heat insulation building materials including but not limited to aerated concrete, foam concrete, foamed ceramic and foamed glass. The invention further discloses a preparation method of the foam concrete. The foam concrete containing the recycled inorganic lightweight aggregate has the advantages of being high in strength, small in shrink, free of formwork collapse, good in fluidity, homogeneous, low in cost and the like and is especially suitable for cast-in-situ lightweight walls, roofs, lightweight cement product elements and the like.

High-performance cement, concrete and its production are disclosed. The cement consists of industrial fag end, activator, functional regulator and performance regulator, and Bosi specific surface is 300-550m2/kg. Its advantages include excellent fluidity and endurance, less loss and hydrated heat energy, better density and strength.

An activating grinding aid for industrial waste residues is prepared from catalyst (1-8 wt.%), activating agent (30-80 wt.%), setting regulator (0-20 wt.%), grinding aid (3-12 wt.%) and carrier (3-30wt.%). Its advantages are effective use of industrial waste residues, low electric consumption of grinder, and improve cement performance.

The invention discloses an anti-crack expanding agent which comprises the following ingredients by weight: 35%-40% of calcium oxide clinker, 15%-20% of gypsum, 30%-35% of dickite, 5%-10% of coal ash and 2%-5% of wollastonite powder, wherein the sum of the weight ratios is 100%. The invention further discloses a preparation method of the anti-crack expanding agent. Compared with the prior art, the anti-crack expanding agent disclosed by the invention has the advantages of being capable of effectively preventing concrete from cracking so as to improve compactness.

The invention provides a magnesium oxychloride fiber light wallboard, and relates to the wallboard field in the construction materials. The wallboard is composed of the following components in parts by weight: 40 to 60 parts of magnesium chloride water solution, 20 to 30 parts of magnesium oxide, 0.1 part of fly ash, 0.2 part of slag, 0.5 part of construction waste, 0.1 part of waste ceramic, 2 parts of short glass fiber, 2 parts of straw, 2 parts of saw dust, 3 parts of perlite, and 0 to 2 parts of modifier. The formula of the wallboard comprises industrial and agricultural wastes such as fly ash, slag, mineral slag, construction wastes, broken ceramics, straws, and saw dust, thus the wastes are fully recycled and reutilized, and moreover the using amount of sands and stones is reduced, so the destroy on mountain and river bed is avoided, resources are saved, and environment is protected. The prepared magnesium oxychloride fiber light wallboard has the advantages of good water resisting property, high compressive strength, good freeze resisting performance, good acid/alkali resistant property, no halogen appearance, no scumming, and no deformation.

Belonging to the technical field of building material concrete, the invention in particular relates to a composite admixture for high strength concrete and a preparation method thereof. The composite admixture for high strength concrete is formed by mixing of the following components by weight percentage: 1%-3% of cement clinker, 20%-30% of silica fume, 20%-30% of levigated desulphurization ash, 20%-30% of superfine fly ash, 1%-2% of a plasticizer, 1%-2% of a strength exciting agent, and the balance levigated slag powder. Specifically, the strength exciting agent is formed by mixing of an additive XC, triethanolamine, triisopropanolamine, redispersible latex powder, nano-silica and xanthan gum in a ratio of 1:1.5-3:1.5-3:0.015-0.04:0.8-1.2:0.4-0.6, and the plasticizer is powdery polycarboxylate superplasticizer. The composite admixture adopting the technical scheme of the invention can improve the concrete strength and durability, and is easy to prepare.

The invention discloses metakaolin concrete for oversized structure and a mixing proportion designing method. The metakaolin concrete is prepared by mixing 1016-1072kg of gravel, 825-848kg of refined machine-made sand, 213-282kg of P.O42.5 cement, 37-43kg of II-grade coal ash, 51-80kg of S75 slag powder, 22-26kg of metakaolin, 22-26kg of I-type UEA expanding agent, 0.6-1.5kg of polypropylene fiber, 6.26-8.13kg of coagulation-delaying polycarboxylate superplasticizer and 163-176kg of water. An aggregate close packing model is adopted, and a designing method based on wrapping and filling gravel gaps through mortar and wrapping and filling refined machine-made sand gaps through binding material slurry is adopted, so that close packing of components of the concrete is realized, improvement on strength and fluidity of the concrete is facilitated, and binding material consumption and system hydration heat can be reduced.

The invention relates to a preparation for a fly ash-based geopolymer and an application method thereof. The method mainly comprises the following steps: excitant solution and fly ash are mixed and stirred to paste; the paste is injected into a mold frame for molding; the molded product is maintained; the excitant solution is 2mol/L-5mol/L of silicate solution or water glass solution with the solid content to be 25-40% and the modulus to be 1.0-1.5. The preparation and the application method of the fly ash-based geopolymer fully use the industrial waste fly ash, which has the advantages of reducing cost, being favorable for environmental protection, reducing energy consumption and convenient application; the product obtained has the excellent characteristic of geopolymer.

The invention provides a low heat composite cementing material, the raw materials of which comprise, by weight: 20-50 parts of cement, 40-70 part of fly ash, 5-25 parts of metakaolin, and 0-8 parts of an exciting agent. The cementing material is prepared by placing the above materials into a material mixer in order, and stirring them for 5-15m at a speed of 60-120 r/m under normal temperature and pressure. Application of the cementing material consists of the steps of: placing 88-97 parts by weight of the cementing material, 3-12 parts by weight of an expanding agent 1.0-1.5 parts by weight of a water reducer, and 24-32 parts by weight of tap water into a cement paste blender for blending based on the speed and procedure prescribed by the national building material industry standard JC/T729-2005: carrying out slow stirring for 117-123s at a rotation speed of 135-145 r/m and a revolution speed of 57-67 r/m, then stopping stirring for 14-16s, and then performing stirring again rapidly for 117-123s at a rotation speed of 275-295 r/m and a revolution speed of 115-135r/m for molding. The material provided in the invention is not only suitable to be used as a building material, and also can be used in backfill grouting, toxic waste curing and other special aspects.