192results about How to "Small drying shrinkage" patented technology

The invention discloses a building exterior wall thermal insulation material. The building exterior wall thermal insulation material is formed by mixing a binding material, thermal insulation lightweight aggregate and a property-modifying additive according to the weight ratio of (40-85): (10-55):5. The building exterior wall thermal insulation material disclosed by the invention can be manufactured into wall thermal insulation mortar, thermal insulation blocks and thermal insulation boards, can be applied to different parts of a building, so as to ensure that the energy conservation index of the building meets the national mandatory standard, the fire rating can reach level A, and the drying shrinkage is low. A preparation process of the building exterior wall thermal insulation material is energy-saving, meanwhile, the recycling problem of industrial waste gypsum is solved, and the pollution of the industrial waste gypsum to the environment is avoided.

The invention provides an aerated concrete block produced through using specially-made mineral waste residue and tailings steel slag and a production method of the aerated concrete block. The aerated concrete block is produced through the following steps: adding an additive A, an additive B and water in components as follows: 40 to 50% of specially-made mineral waste residue obtained in a such way that cinder is obtained through the production process of recycling steel slag discharged from Taizhou Zhenchang Industrial Waste Residue Comprehensive Utilization LTD and metallurgical and chemicalferrous waste residue, and then is water-quenched, 35 to 45% of tailings steel slag, 2 to 4% of cement clinker, 1 to 3% of gypsum, and 8 to 12% of modified wood, wherein the grain size of the specially-made mineral waste residue is less than or equal to 5 mm, the grain size of the tailings steel slag is less than or equal to 20 mm, the additive A accounts for 1% of the total weight of the components, the additive B accounts for 0.05% of the total weight of the components, and water accounts for 0.5 to 0.6 times of the total weight of the components; and conducting mixing, heating, air-entrapping, steaming and pressing, and curing in sequence. The aerated concrete block produced by adopting the production method is high in strength, and small in drying shrinkage value, and can meet the block standards of the A3.5 grade and the B09 grade in the JC1062-2007 foam concrete block standard.

The invention relates to quick setting and rapid hardening non-shrinkage anti-disturbance self-compacting concrete and a preparation method thereof. Raw materials contain the following ingredient (by weight): 100-450 parts of cement, 20-70 parts of gypsum, 150-450 parts of fine aggregate, 200-600 parts of crude aggregate, 10-30 parts of fly ash, 10-50 parts of heavy calcium powder, 10-50 parts of silica fume, 10-50 parts of slag powder, 10-50 parts of quartz powder, 1-5 parts of a water reducer, 0.1-0.8 part of cellulose ether, 0.05-1.0 part of a retarder, 0.1-1.0 part of a coagulation accelerator, 0.5-2.0 parts of an antifoaming agent, 0.5-2.05 parts of an early strength agent, 0.5-5.0 parts of an expanding agent, 1.0-5.0 parts of a shrinkage reducing agent, 0.2-1.0 part of anti-crack fiber, and 50-200 parts of water. Through an optimum mixture ratio and by the use of a polycarboxylate superplasticizer, the early strength agent and other additives, properties such as early strength, disturbance rejection, crack resistance, durability, self-compaction and the like of concrete are greatly enhanced, and disadvantages of low early strength, long time interval of initial set and final set and the like of common concrete are solved.

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 relates to a backfilling method for tunnel construction through a TBM method and equipment for the backfilling method.The backfilling method that TBM pea gravel backfilling and grouting has many technical defects, the time limit for a project cannot be guaranteed, and backfilling quality is quite unstable.According to the backfilling method, backfilling is carried out at 360 degrees in a whole cavity segment between the duct piece outer wall and the surrounding rock wall of a TBM prefabricated lining structure, a bottom arch is backfilled with mortar and quick-setting mortar, arches on the two sides are backfilled with pea gravel grout, and a top arch is backfilled with composite mortar; in other way, the bottom arch is backfilled with mortar and quick-setting mortar, the arches on the two sides are backfilled with fine aggregate concrete and quick-setting fine aggregate concrete, and the top arch is backfilled with composite mortar.The technical advantages of mortar backfilling and fine aggregate concrete backfilling are fully utilized, pea gravel grouting and backfilling are replaced partially or completely, the technical defects of pea gravel grouting and backfilling are overcome, and particularly under the condition of unfavorable geology, the backfilling work efficiency is improved, and engineering quality is guaranteed.

The invention discloses straw fiber reinforcement air-entrained concrete which comprises a base material, an aluminum powder paste, a straw fiber, an additive and water, wherein the doping amount of the aluminum powder paste accounts for 0.06%-0.09% of the dry weight of the base material; the doping amount of the additive accounts for 0.5%-0.8% of the dry weight of the base material; the doping amount of the straw fiber accounts for 2%-10% of the dry weight of the base material; and the mass ratio of the water and the base material is 0.52-0.60, The invention also discloses a preparation method of the straw fiber reinforcement air-entrained concrete. The straw fiber reinforcement air-entrained concrete disclosed by the invention reduces the shrinkage cracking and production cost of air-entrained concrete and solves the problems of straw resource waste, ceramic waste treatment and environmental pollution to a certain degree.

The invention discloses a method for improving ceramic mold precision with a vacuum freeze-drying technology, and relates to the technical field of precision casting. According to the invention, a water-based ceramic slurry containing solid-phase fiber is first prepared based on a gel injection molding technology; the water-based ceramic slurry is cast into a resin mold; when a ceramic mold blank is completely gel-solidified, the blank is placed into a vacuum freeze-drying machine and is subjected to pre-freezing; after a period of time, water in the ceramic mold blank is completely crystallized, vacuuming is carried out, and material temperature is controlled, such that water is directly sublimated from ice into vapor, and is pumped away. When the ceramic mold is thoroughly dried, compared to a ceramic mold blank without fiber, the ceramic mold provided by the invention has lower drying shrinkage, improved strength, and higher precision.

The invention relates to a reinforced cement foaming board and a preparation method thereof. The reinforced cement foaming board comprises the following components in percentage by weight: 27.00-35.50% of water, 28.0-61.0% of Portland cement, 0-32.70% of coal ash at grade I or a mixture of coal ash and recycled filler, 0-2.00% of wollastonite powder, 0.10-0.30% of fiber, 0.37-0.65% of ammonium stearate, 1.00-2.00% of a mixture of 10 parts of calcium sulphate and 1 part of calcium formate, 0.10-0.20% of naphthalenesulfonate formaldehyde condensation compound, 0.90-1.20% of hydrogen peroxide and reinforcement net. The reinforced cement foaming board provided by the invention has the advantages of low apparent density, low heat conductivity coefficient, good noise reduction effect, high strength, no crack and shock resistance.

The invention discloses an A2.0 B04 grade autoclaved aerated concrete block prepared from quartz eroded sand. The A2.0 B04 grade high-performance autoclaved aerated concrete block is prepared from quartz eroded sand, cement, quick lime, industrial waste phosphogypsum, aluminum paste and water. The dry density of the concrete block is 415kg/m<3>, the cube crushing strength average value is 2.1 MPa, the single unit minimum value is 1.9 MPa, the ratio of splitting tensile is 0.19, the frost quality loss is 3.7%, the frost strength is 1.7 MPa, the heat conductivity coefficient (dry state) is 0.116 W/(m.K), the dry shrinkage value (standard value) is 0.22 mm/m and the percent of pass is greater than 98%. The raw material processing method is reasonable, the formula calculation is scientific, the production process is simple and the production waste can be recycled. The concrete block is a novel energy-saving and environmentally-friendly wall material and is suitable for industrial process.

The invention discloses an aerated concrete block and a preparation method thereof, and relates to the technical field of building materials. The aerated concrete block is prepared from the following raw materials: modified pulverized fuel ash, slag Portland cement, kaolin, polypropylene fibers, baryta feldspar powder, aerated aluminum powder, heulandite powder, tetrachloroisophthalonitrile emulsion, benzoic acid, ethyl paraben, dimethyl sulfoxide, an early strength agent, a water reducing agent, a water addition agent, a foaming agent and a foam stabilizer. The preparation method comprises the steps of firstly, evenly stirring and mixing the raw materials to prepare slurry, then carrying out pouring, initial curing treatment, cutting and autoclaved curing on the slurry to obtain the aerated concrete block. The aerated concrete block is high in compression strength, good in heat resistance and sound insulation, small in drying shrinkage value, excellent in water resistance, simple to prepare, wide in raw material sources, and low in cost, thus being suitable for being popularized and used.

The invention discloses flame-retardant high-temperature-resistant concrete and a preparation method thereof. The flame-retardant high-temperature-resistant concrete is prepared from the following components in parts by weight: 30 to 40 parts of cement, 12 to 30 parts of clay clinker, 18 to 30 parts of water, 8 to 15 parts of magnesia, 2 to 3 parts of a water reducer, 5 to 10 parts of alumina, 1 to 2 parts of a modifier, 1 to 2 parts of graphene, 1 to 2 parts of a flame retardant agent, 0.1 to 0.4 part of hexenyl distearamide, and 0.05 to 0.3 part of polyethylene glycol. The used materials are simple and easy to obtained, the process is easy to control, the production cost is low, and the preparation method adapts to mass production; the ratio is reasonable, and the water reducer, the modifier and the flame retardant agent are formed through compounding, so that the compressive strength of the flame-retardant high-temperature-resistant concrete is significantly enhanced, the dry shrinkage rate is significantly decreased, and the water absorption rate per volume is decreased significantly; and in addition, the preparation method of the flame-retardant high-temperature-resistant concrete is simple and feasible, has no special requirements on equipment, and is simple to operate.

The invention discloses a novel thermal-insulation material for a building external wall, which comprises the following components in parts by weight: 5-10 parts of coal ash, 6-12 parts of styrene resin, 4-10 parts of inorganic fiber, 8-12 parts of butyl acetate, 5-10 parts of aluminate refractory cement, 7-13 parts of calcium oxide, 3-8 parts of hollow glass micro-beads and 1-2 parts of gypsum powder. The novel thermal-insulation material for the building external wall has the advantages that all the raw material components are approximately neutral, cause little pollution to surroundings, are non-toxic, odorless, pollution-free, green and environment-friendly; the drying shrinkage ratio is small, the drying time is short, and the construction time is greatly shortened; and the dosage is small, the construction cost is low, the cost is greatly saved in the using process, and the using method is simple.

The present invention discloses a lightweight high-strength press molding block and a production method thereof. The block is prepared through carrying out treatments of material preparing, mixing and stirring, pressing formation and autoclave curing for a digested mixed material and a lightweight coarse aggregate, wherein the pile volume content range of the digested mixed material is 50-60%, the pile volume content range of the lightweight coarse aggregate is 40-50%. The digested mixed material is prepared from a fine aggregate material and a cementing material, wherein the fine aggregate material is a mixture comprising one or more than two selected from fly ash, slag, coal slag, coal gangue, shale, and has a particle size less than 3 mm, the cementing material is a mixture comprising one or more than two selected from quick lime, cement and carbide slag. The produced block provided by the present invention has characteristics of small density, high strength, good insulation property, simple production method, waste utilization and environmental protection, and provides significant social and economic benefits.

The invention provides an A3.5 B05 grade autoclaved aerated concrete block made of quartz weathered sand. The high-performance A3.5 B05 grade autoclaved aerated concrete block is made by using the quartz weathered sand, cement, quicklime, industrial waste phosphogypsum, aluminum powder paste and water as raw materials. The dry density of the block is 509kg/m<3>, the average cubic compressive strength of the block is 3.6MPa, the single component minimum of the block is 3.2Mpa, the split-to-compression ratio is 0.20, the mass loss after freezing is 2.8%, the strength after freezing is 3.1Mpa, the heat conduction coefficient (dry state) is 0.1251W/(m.K), the drying shrinkage value (standard process) is 0.32mm/m, and the qualified rate is greater than 98%. The method has the advantages of reasonable treatment of raw materials, scientific formula calculation, concise production flow, recycling of production wastes. The block is a novel energy saving and environmental protection wall material, and can be industrially produced.

The invention discloses a method for preparing ceramsite by using Xianfeng diatomite. The method comprises steps of: crushing a naturally dried raw material Xianfeng diatomite; mixing the raw material with water in a ratio of 100:60-70 and stirring uniformly; air-drying the mixture to a water content of 40-50%; moulding; air-drying naturally; and finally sintering to obtain high strength diatomite ceramsite. The method of the invention is simply operated, has good effect; and the ceramsite prepared by the method has good strength, reduced water absorption, strong durability and wide application scope.

The invention discloses a cement mortar for constructional engineering. The cement mortar comprises a cement, yellow ground, a water-retaining and thickening agent, a plastic swelling agent, a concrete swelling agent and an internal curing agent. Because the plastic swelling agent forms a large amount of fine and uniform bubbles in the mortar, the plastic mortar swells; after the internal curing agent is mixed, innumberable mini-impounding reservoirs are built in the cement mortar; and when the mortar is in lack of water, the water in the internal curing agent can be slowly released so as to ensure the concrete and the swelling agent to continuously hydrate until the water is used up. Thus, long hydration time is provided for the swelling agent, and more swell crystal ettringites are generated, thereby reducing the dry shrinkage value of the cement mortar.

The present invention relates to a method for comprehensive treatment of building garbage. The method comprises: a, disinfecting building garbage to be treated with an agent; b, loading the building garbage obtained in the step a into a material hopper, transporting to a sorting platform, and sorting out debris; c, feeding the sorted building garbage into a jaw crusher through a plate type material feeder, and carrying out primary crushing; d, carrying out magnetic separation on the building garbage obtained in the step c with a magnetic separation machine, feeding into the material hopper ofan impact crusher, and carrying out final crushing with the impact crusher; and e, carrying out screening and peeling on the building garbage obtained in the step d by using a screening machine so asto obtain the sand and stone aggregate in concrete, feeding into a cleaning separation machine, carrying out cleaning separation, feeding into a coarse aggregate bin, and separating to obtain fine powder, wherein the fine aggregate separated by the cleaning separation is used as the raw material for dry powder mortar or pre-mixed mortar or concrete three-hole brick. According to the present invention, with the method, the building garbage resources can be subjected to comprehensive utilization, such that the building garbage can achieve ordered management, resource utilization and harmless treatment, and the purposes of land saving and secondary pollution reducing can be achieved.

The invention discloses a ferronickel slag magnesium phosphate binding material and application thereof. The binding material is prepared from 6-12 parts of ferronickel slag, 12-25 parts of dead burned magnesia, 3-12 parts of phosphate and 1-10 parts of retarder. The ferronickel slag magnesium phosphate binding material is used in structural members requiring high strength in early age period and rush-repair work. The ferronickel slag magnesium phosphate binding material has the advantages of achieving rapid hardening and early strengthening, and being high in strength and small in shrinkage deformation, the interior structure is more compact, the porosity is low, and the durability including water tolerance is improved. Moreover, according to the ferronickel slag magnesium phosphate binding material, innocent treatment of the ferronickel slag is achieved, high-efficiency resource utilization of industrial waste residues is promoted, and on the premise that the mechanical properties of the binding material is guaranteed, the consumption of dead burned magnesia is reduced, the consumption of a non-renewable resource, namely magnesite, and energy loss are reduced, the production cost of the magnesium phosphate binding material is decreased, and therefore, economic benefits and environmental benefits are remarkable.

The invention relates to an aerated concrete block produced by dump-leached slags. The block comprises the following raw materials in parts by weight: 200 to 500 parts of dump-leached slags, 80 to 150 parts of quick lime, 50 to 200 parts of cement, 3 to 10 parts of gypsum, 0.4 to 1.2 parts of aluminium powder and 8 to 15 parts of superplasticizer, wherein the dump-leached slags are waste residues formed after silicate minerals are processed by acid. The aerated concrete block has the advantages of light weight, high strength, heat preservation, heat insulation and the like, utilizes wastes, is environmental-friendly, saves resources and is a green building material with excellent performance.

The invention discloses environmentally friendly heat-insulation fireproof mortar and a preparation method thereof. The heat-insulation fireproof mortar is prepared from, by weight, 30 parts of ordinary Portland cement, 10 parts of pulverized fuel ash, 25 parts of construction waste, 25 parts of vitrified micro beads, 4 parts of gypsum powder, 0.5 part of plant fiber, 2.5 parts of sodium silicate; 1.5 parts of foaming agent and 1.5 parts of redispersable latex powder. The environmentally friendly heat-insulation fireproof mortar is good in bonding performance, can enhance the bonding strength of a heat-insulation material and a wall to the great degree, has superior fireproof performance and certain heat absorption effect, accordingly enhances the fireproof performance of a wall heat insulation system, has strong anti-aging capability and enhances the durability of the heat insulation system. All performance indexes of the mortar meet the performance requirements of Heat-insulation Mortar for Buildings GB/T 20473-2006.

The invention discloses gypsum-based heat-insulation mortar and a preparation method thereof. The gypsum-based heat-insulation mortar is prepared from the following ingredients in parts by weight: 15to 25 parts of Portland cement, 30 to 40 parts of building plaster, 10 to 20 parts of glass bead, 10 to 30 parts of converter steel slag, 10 to 20 parts of coal ash, 5 to 15 parts of nano silicon dioxide powder, 15 to 25 parts of ash calcium powder, 5 to 10 parts of modified pulpified starch, 2 to 8 parts of dispersible latex powder, 5 to 15 parts of cellulose ether, 3 to 8 parts of crack-resistant fiber, 5 to 15 parts of modified talcum powder, 4 to 10 parts of binder, 0.3 to 0.7 part of air entraining agent, 0.2 to 0.6 part of water repellent, 0.1 to 0.5 part of water reducing agent and 40 to 60 parts of water. The gypsum-based heat-insulation mortar disclosed by the invention has the advantages of high strength, good heat insulation, small drying shrinkage, no easiness in cracking and the like. The gypsum-based heat-insulation mortar can meet a requirement of building industry to mortar performance indexes and can be widely applied to projects of heat insulation and the like of outer walls and inner walls of buildings.

The invention discloses a novel high-toughness fiber reinforced cement-based composite material and a preparation method thereof. The composite material is prepared from, by weight, 10-20 parts of composite reinforcing fiber, 30-50 parts of portland cement, 15-25 parts of fly ash, 4-10 parts of fine sand, 1-5 parts of dispersing agent, 2-5 parts of water reducing agent, 0.5-3.5 parts of tougheningagent and 12-18 parts of water. According to the composite material, the toughness and crack resistance of the material are improved, the composite reinforcing fiber is uniformly distributed by the dispersing agent, the mechanical properties are changed, the ability of the material to resist deformation is greatly improved, and the probability of occurrence of cracking and fracture of concrete isreduced.