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

The invention discloses a super-light foam cement concrete and a preparation method thereof. The super-light foam cement concrete comprises the following raw materials by weight parts: 9-36 parts of dead burnt magnesium oxides, 9-32 parts of dihydric phosphates, 0.5-7 parts of adjustable solidification agents, 6-25 parts of light burnt magnesium oxides, 0.5-7 parts of sulfur-containing components, 1-25 parts of industrial slag powder, 1-20 parts of kieselguhrs, 0.3-3.9 parts of waterproof agents, 0.2-1.7 parts of foam stabilizing agents, 1.0-8.9 parts of foaming agents and 25-90 parts of water. The preparation method of the high-performance super-light foam cement concrete comprises the following steps of: metering raw materials; preparing the slurry containing the foam stabilizing agents; uniformly mixing the foaming agents; pouring and standing by; foaming and expanding; coagulating and curing; and naturally maintaining. The super-light foam cement concrete has the advantages of light weight, high strength, heat preservation and insulation, stable volume, low production cost, energy-saving property, no environmental pollution, and the like. The super-light foam cement concrete is simple in production process and is especially suitable for the heat-insulating material of external building wall, roof and floor.

The invention belongs to the field of concrete structural materials, and discloses a preparation method for high-ductility low-shrinkage anti-cracking concrete for bridge deck pavement. The high-ductility low-shrinkage anti-cracking concrete for bridge deck pavement is characterized by comprising the following components in proportion: 135-155 kg / m<3> of water, a cementing material, 600-800 kg / m<3> of fine aggregate, 950-1150 kg / m<3> of coarse aggregate, 2.0-3.0 kg / m<3> of shrinkage-reducing ductility-increasing component,10-20 kg / m<3> of internal curing agent, 3.0-5.0 kg / m<3> of water reducing agent and hybrid fiber, wherein the cementing material comprises 320-380 kg / m<3> of cement and 20-40 kg / m<3> of coal ash in proportion; and the hybrid fiber comprises 0.8-1.0 kg / m<3> of organic polymer fiber and 40-50 kg / m<3> of steel fiber in proportion. According to the concrete and the preparation method for the concrete disclosed by the invention, reinforcement meshes on the bridge deck pavement layer can be cancelled.

The invention relates to a functionally-graded cellular-concrete thermal-insulating material and a preparation method thereof. The functionally-graded cellular-concrete thermal-insulating material comprises a cellular-concrete thermal-insulating core, a plurality of air holes are uniformly distributed in the thermal-insulating material, and the surface of the cellular-concrete thermal-insulating core is wrapped with a functionally-graded layer; in the air holes of the functionally-graded cellular-concrete thermal-insulating material, the air hole in the cellular-concrete thermal-insulating core has a maximum diameter, then, the diameters and porosities of the air holes from the cellular-concrete thermal-insulating core to the outside are in a continuous graded change in a descending order, the thickness of the functionally-graded layer is 0.1-20 mm, the porosities of the air holes are in a continuous graded change in a range of 1- 95%, and the diameters of the air holes are in a continuous graded change in a range of 0.1-8 mm. According to the invention, the interior of the material is porous and thermal-insulating, and the surface of the material is high in density and strength, the mechanical strength of the material is gradually improved from the inside to the outside, and the thermal conductivity factor of the material is gradually reduced front the outside to the inside, thereby achieving an effect of integrating light weight, high strength, thermal insulation and fire prevention.

The invention discloses a construction material produced from industrial residue, aims to provide a construction material having the advantages of light weight, sound insulation, heat insulation, low cost, fire resistance, dense products, high rigidity and the like, and solves the problems with land occupation and pollute environment of phosphate slag and phosphogypsum at the same time. the invention is realized through the following technical scheme: phosphate slag and phosphogypsum are used as raw materials for producing the construction material, which comprises the following components by the weight part: 35 to 65 parts of phosphate slag, 10 to 40 parts of phosphogypsum, 5 to 15 parts of lime, 15 to 28 parts of cement, 0.1 to 0.4 part of light aggregate, 0.02 to 0.05 part of soluble glass, 0.02 to 0.05 part of water-reducing agent, 0 to 0.004 part of retarding agent, 0 to 0.005 part of early-strength admixture, and 0 to 0.008 part of foam killer; the components are weighed by the formula weight part and added to a blender; water is added to the blender with the water-to-material proportion being 4 to 10 and mixed evenly with the materials; and the solution is cast into a die and natural air dried after molding. Dies with different structures can be used according to purposes to conduct cast molding. The construction materials such as wall plates, guardrail decoration pillars, door and window sleeves, vase sleeves and the like can be produced.

The invention discloses light low-shrinkage super-high performance concrete which is prepared from cement, coal ash beads, silica fume, pottery sand, a brass coated steel fiber, shrinkage and viscosity reduction type water reduction agent, a water-retention shrinkage-reduction inner curing agent and water as main raw materials. According to the concrete, the pottery sand is adopted as aggregate, the self weight of the concrete is reduced, and a high-strength and dense 'arch housing' interface area is formed on the surface of the pottery sand by using a pre-mixing process, so that the interfacestrength is improved, and the mechanical properties and the anti-penetrability performance of the concrete are improved; due to the adoption of the shrinkage and viscosity reduction type water reduction agent and the coal ash beads, the working performance and the density of the concrete are improved; due to the adoption of the pre-wetted pottery sand and the developed water-retention shrinkage-reduction inner curing agent, reduction of wetness inside the concrete is retarded, the self-shrinkage and the drying shrinkage of the concrete are reduced, and the volume stability of the concrete isimproved. While the self weight of the concrete is reduced, the light low-shrinkage super-high performance concrete disclosed by the invention is good in working performance, mechanical property, anti-penetrability and durability, and has significant practical application values.

The invention relates to a castable for preparing a high-temperature ceramic wear-resistant lining, which contains 10-25% of fused mullite with a particle size of 3-5mm, and 20-45% of fused mullite with a particle size of 1-3mm. 3-7% of andalusite with a particle size of 0.1mm-1mm, 8-25% of platy corundum with a particle size of 0.1-1mm, 5-20% of fused white corundum with a particle size of 0.1-1mm, 5-20% of fused white corundum, and pure calcium aluminate with a particle size of <0.074mm 2-10% of cement, 2-6% of silicon micropowder, and 2-10% of alumina micropowder. The castable can be applied to the intersection of blast furnace hot air pipe and air supply branch pipe, etc. where thermal shock stability is high. The lining made of it has good thermal stability, high temperature air erosion resistance, good thermal shock resistance, It has the advantages of long life cycle, simple manufacturing method, short construction period, environmental protection and pollution-free, low cost, and easy industrial production.

The invention relates to self-compacting concrete which is used for overcoming the contradiction between flowability and stability, early strength and delayed coagulation, contraction and expansion and the like of the self-compacting concrete in the prior art. In the invention, by means of combination of an aliphatic (hydroxyl) sulfonate superplasticizer and a polycarboxylic acid superplasticizer, selection and collocation of a cementing material and coarse and fine aggregates as well as specific mix design, the self-compacting concrete (more than C40) with low consumption of the cementing material is prepared from coal ash, mineral powder and tailings, wherein, a ketoaldehyde condensate is taken as the main component of the aliphatic (hydroxyl) sulfonate superplasticizer; and when the superplasticizer is added to cement paste, the mixed concrete has the advantages of good construction workability, less possibility of bleeding and segregation, no crystallization precipitate at low temperature and the like. Compared with the prior art, the self-compacting concrete prepared by the method provided by the invention has the advantages of lowering cement consumption by at least 70kg / m<3>, reducing consumption of the cementing material by at least 70kg / m<3>, comprehensively utilizing at least 470kg / m<3> of solid waste, and lowering concrete cost by at least **yuan / m<3>.

The invention relates to an air brick with a high blowing through rate and a manufacturing method thereof. The air brick is composed of the following components: coarse corundum with granularity greater than 0.5mm and smaller than or equal to 1 mm and mass fraction of 35-50%; fine corundum with granularity greater than 0 and smaller than or equal to 0.5 mm and mass fraction of 25-40%; alumina fine powder with granularity greater than 0.020 mm and smaller than or equal to 0.044 mm and mass fraction of 8-15%; alumina micro powder with granularity greater than 0 and smaller than or equal to 0.020 mm and mass fraction of 5-10%. The manufacturing method comprises the procedures of mixed milling, material kneading and press forming, and further comprises the procedures of roasting, high temperature sintering, flow detecting, steel shell packaging and the like. According to the air brick provided by the invention, the particle size distribution and the machine pressing pressure are controlled, and uniformly distributed and mutually communicated micropores are formed in a brick body after high temperature sintering so as to achieve the permeability of an air brick body material.

The invention belongs to the technical field of building materials, and particularly relates to ultra-high performance concrete mixed with hybrid fibers. The concrete is prepared from ordinary Portland cement, silica fume, floating bead fly ash, slag powder, HP-CSA, quartz sand, limonite ore, titanium alloy sand, water reducing agent, defoaming agent, steel fiber, basalt fiber, cellulosic fiber and water. The ultra-high performance concrete mixed with the hybrid fibers has the advantages that the problems that the water-binder ratio is low, the usage amount of cementing material is large, andthe incorporation of the high-performance water reducing agent increases the shrinkage of the concrete can be solved, the constraint problem caused by the shrinkage on the application of the ultra-high performance concrete fabricated precast unit can be overcome, and the toughness of products is drastically improved. The ultra-high performance concrete mixed with the hybrid fibers is applicable tovarious concrete projects with special structures such as long span and super high-rise, and is suitable for various types of fabricated buildings.

The invention provides a special concrete using waste and old rubber particles and steel slag particles as aggregate, which comprises the following components in parts by mass: 100 parts of cement, 0.1-3 parts of water reducing agent, 0-50 parts of mineral admixture, 0-600 parts of sand, 200-400 parts of steel slag particle, 15-50 parts of rubber particle and 20-80 parts of water. The invention has the advantages that the two wastes of the waste and old rubber particles and steel slag are simultaneously added into concrete, the wastes can be greatly utilized, and the natural environment is improved; the expansion stress of free calcium oxide in steel slag is adsorbed by utilizing the elastic characteristic of the waste and old rubber particles, the steel slag can be utilized without special processing, and the integral volume stability of materials is high; by adding the waste and old rubber particles, the elasticity of the special concrete is higher than that of common concrete; and the special concrete can be widely applied to places in which common concrete, such as road surfaces, parking lots, buildings, and the like can be applied.

The invention discloses a preparation method of phosphogypsum-based anti-cracking mortar applied to interior insulation of an external wall. The preparation method is characterized in that the anti-cracking mortar comprises the following components in percentage by mass: 40-80% of building phosphogypsum, 20-50% of dried sand, 0-20% of cement, 0-5% of fly ash, 0-0.2% of a high-performance plasticizer, 0-0.2% of a thixotropic agent, 0.1-0.3% of a water-retaining agent, 0.01-0.4% of a gypsum retarder, 0-3% of a micromolecular polymer and 0-0.25% of anti-cracking fiber. According to the preparation method, the building phosphogypsum prepared by washing and calcining industrial byproduct phosphogypsum is used as a cementing material, so that the problems that a cement-based material is easy to shrink, hollow and crack are solved; through full use of the characteristics of fast setting and hardening, good volume stability and low own ratio of compressive strength to flexural strength of a gypsum material, the anti-cracking mortar, of which the ratio of the compressive strength to the flexural strength is lower than 2.5, the operable time is 1-2h, the final setting time is shorter than 3h, the insulation board bonding strength is higher than 0.10MPa and breakage occurs inside an insulation board, is prepared. The anti-cracking mortar is applied to the interior insulation of the external wall and low in cost, reduces the environment pollution, and is simple in production process, low in energy consumption and good in product performance; compared with other insulation board crack resisting products, the anti-cracking mortar has higher market competitiveness and is strong in practicality.

A geopolymer composite material for 3D printing and a preparation method and application thereof are disclosed. The geopolymer composite material comprises the following ingredients (by weight): 20-25% of water-quenched granulated blast furnace slag powder, 10-15% of ground steel slag, 0-5% of fly ash, 33-45% of tailings machine-made sand, 3-5% of a composite activator, 2.5-3% of a high-molecular polymer, 1-3% of a volume stabilizer, 1-2% of a thixotropic agent, 0.05-0.1% of an antifoaming agent and 13.9-12.45% of mixing water. The above ingredients are fully and uniformly stirred and then the mixture is subsequently pumped into a 3D printer for construction. The geopolymer composite material has good caking property, strong stability and has good pump-out morphology maintaining capability and bond property. Printed buildings have good morphology and volume stability, and houses and buildings have good overall stability and use security.