121results about How to "Rapid early strength development" patented technology

The invention discloses concrete healant, which comprises following components by weight percent: 30 to 55 percent of gelatinization materials, 40 to 65 percent of fine aggregates, 0.1 to 0.5 percent of water reducing component, 0.05 to 0.5 percent of early-strengthening component, 0.05 to 0.2 percent of delayed-coagulation component, 0.2 to 1.0 percent of nano materials, 0.5 to 1.0 percent of high-activity substances, 0.01 to 0.2 percent of water retention thickening component, 0.2 to 2.0 percent of polymer and 0.02 to 0.2 percent of defoaming agent. The concrete healant not only has characteristics of good mobility, fast strength development, high adhesion strength and small retraction, but also can fill active substances into original concrete gaps and can produce compact crystals, so that the cohesion strength of the new and the old concrete interfaces can be remarkably improved, and the concrete healant is applicable to the concrete mending projects of bridges, caves, industrial workshops and civil construction.

The invention discloses a concrete material which totally adopts industry solids waste to replace cement preparation, comprising a gelled material and a skeletal material. The gelled material is composed of the components with the following weight portions of 36 to 75 portions of fluidized bed burning coal solid sulfur clinker, 9 to 25 portions of acetylene sludge and 6 to 15 portions of phosphogypsum; because the cementing materials such as cement, lime, asphalt, and the like, are not needed at all, material costs are remarkably reduced, great amount of industry solids waste is used to produce building materials, especially the fluidized bed burning coal solid sulfur clinker is used to serve as raw material, environment pollution is avoided, and land resources are saved.

The invention discloses a preparation method of a synthetic type polycarboxylic acid water reducer. The synthetic type polycarboxylic acid water reducer has a solid content of 40-50%, and is prepared from the following raw materials in parts by weight: 100 parts of unsaturated polyoxyethylene ether, 7-15 parts of unsaturated acid, 4-10 parts of unsaturated ester, 1-3 parts of an amide derivative, 0.5-2 parts of an oxidant, 0.2-1.2 parts of a chain transfer agent, 0.3-2 parts of a reducing agent, 0.1-1 part of a crosslinking agent, 0.01-0.1 part of ferrous sulfate heptahydrate, 5-10 parts of a commercially available mud-resistant auxiliary agent, 90-130 parts of deionized water and an appropriate amount of liquid caustic soda. The preparation method disclosed by the invention adopts a normal-temperature oxidation-reduction initiating system to synthesize the synthetic type polycarboxylic acid water reducer which not only has functions of water reduction and slump loss resistance, but also has functions of mud resistance and early strength, heating is not needed for reaction, the energy consumption is reduced, and the production cost is greatly reduced.

The invention discloses a shield synchronous grouting construction material including, by weight, 200-300 parts of composite Portland cement, 400-600 parts of fly ash, 50-80 parts of 200-mesh calcium based bentonite, 1200-1300 parts of grading river sand, 0.4-0.6 parts of hydroxypropylmethyl cellulose, 0.5-3 parts of a water reducer, 0.3-1 part of a retarder, 1-3 parts of an early strength agent and 16-24 parts of a volume stabilizing agent. Through reasonable adjustment of composition and content of the components, the compressive strength, bleeding ratio, setting time and flowability of the construction material are controlled, so that the construction material has long initial setting time, is quick in early strength development, is not liable to dissociation, has good volume stability, can effectively fill in gaps in buildings and prevent floatation and deformation of tunnel segments, has good flowability and anti-dispersing property, and is easy to transport and to store for a long period.

The invention discloses foam concrete. The foam concrete comprises following raw materials in parts by mass according to a formula: 210-300 parts of cement, 1.0-1.5 parts of a water reducing agent, 5.1-5.5 parts of an early strength agent, 2.1-2.9 parts of a coagulant, 1.7-3.4 parts of fibers, 12-20 parts of a chemical foaming agent, 0-90 parts of superfine slag powder and 100-160 parts of water, wherein the superfine slag powder is formed by aluminosilicate glass particles smaller than 15 mu m, and the specific surface area is 450-500 m<2>*kg<-1>. The compressive strength of the foam concrete is improved on the premise that the foam concrete keeps low density.

The invention discloses an additive capable of improving bending strength and tensile strength of a cement base material. The additive is an aqueous dispersion of organic-inorganic hybrid particles with core-shell structures. Each organic-inorganic hybrid particle is composed of inner and outer layers, wherein the inner layer is an organic polymer core; the outer layer is an inorganic composite oxide or an inorganic composite oxide covalently connected with an organic functional group; the inorganic composite oxide is a silicon-calcium composite oxide or a silicon-magnesium composite oxide or a silicon-calcium-magnesium composite oxide; and the outer layer is in covalent connection with an electronegative organic polyelectrolyte internally. Compared to the mixing amount of a polymer or polymer fiber in a pure polymer-modified cement base material or a polymer fiber-modified cement base material, the mixing amount of the additive in the cement base material can be greatly reduced; and the additive can more obviously improve the splitting tensile and bending resistant performances of the cement base material in comparison with a traditional polymer emulsion in the same mixing amount. Therefore, the additive overcomes the disadvantage that the high polymer mixing amount of the traditional polymer modified cement base material affects the compressive strength of the cement base material, and can effectively improve the bending strength and tensile strength (or splitting tensile strength) of the cement base material.

The invention discloses a high-salt high-alkali medium-low-level radioactive liquid waste cement solidified body which is composed by mixing the following components: high-salt high-alkali medium-low-level radioactive liquid waste and, solidification material, water glass and cellulose ether, wherein the high-salt high-alkali medium-low-level radioactive liquid waste to the solidification material is 0.55-0.75: 1 in mass proportion; the modulus of the water glass is 2.5-3.5 based on Na2O in the water glass and the mass of the solidification material is 1-3% of the mass of the water glass ; the mass of the solidification material is 0.05-0.5% of the mass of the cellulose ether; the component mass percent of the solidification material is as follows: 20-40% of low-heat Portland cement, 15-50% of slag powder, 15-30% of coal ash, 5-15% of zeolite and 5-15% of attapulgite; and the cement solidification body with various properties meeting the requirements is obtained by carrying out normal-temperature maintenance on the mixed slurry which obtained by mixing and stirring. The high-salt high-alkali medium-low-level radioactive liquid waste cement solidified body is suitable for the solidification of the medium-low-level radioactive liquid waste, which has the total salt concentration being 100-400g/L, the pH value being larger than 13 and the nuclide being 90Sr or/and 137 Cs.

The invention belongs to the technical filed of environmental protection engineering and particularly relates to a harmless treatment method for electroplating sludge. The harmless treatment method comprises the following steps: the electroplating sludge is taken, certain amount of quicklime and flue gas desulfurization gypsum is added, crushed sufficiently and stirred uniformly, the mixture is left to stand for a period of time, and modified electroplating sludge is obtained; the modified electroplating sludge and fly ash are taken and stirred uniformly, a certain amount of a composite activator is added and stirred sufficiently again, and a mixture is obtained; an electroplating sludge test block is obtained in a pressure forming manner and cured in a room-temperature environment for 7-28 days, and a solidified electroplating sludge body is obtained. The harmless treatment method adopted for treating the electroplating sludge has the advantages of simple process, low cost, large electroplating sludge curing amount, small capacity increase and the like, meanwhile, the solidified electroplating sludge body obtained after treatment is highly corrosion-resistant, stable for a long time and low in heavy metal leaching toxicity, has certain compressive strength and can be taken as general solid waste to be subjected to landfill treatment.

The invention provides a method for repairing and reinforcing a concrete structure under a severe environment, and belongs to a method for repairing and reinforcing a concrete structure. The method specifically includes the step of FRP rib reinforcement and the step of fiber woven mesh reinforcement. In the step of FRP rib reinforcement, grooving and dust removing are conducted in a concrete protection layer of a beam to be reinforced through a cutting machine, wherein the surface of concrete is kept dry and is not wet; a half of the portion inside each groove is filled with epoxy resin and epoxy resin curing agents or high-performance fine concrete bonding materials; FRP ribs are placed in the grooves, and the grooves are filled with the bonding materials by slightly conducting extrusion; the surfaces are smeared flat, and operators need to wait till the bonding agents are solidified. In the step of fiber woven mesh reinforcement, firstly, the surface of a building to be reinforced is machined to be uneven; the surface of the building to be reinforced is wetted by water, and stirred fine concrete is sprayed to the structure and the surfaces of fiber woven meshes; a layer of fine concrete is sprayed on each layer of fiber woven mesh each time a layer of fiber woven mesh is laid, and water curing is conduced on the fine concrete through water till the age. By means of the good corrosion resistance of the FRP ribs and the fiber woven meshes, the method is more effective under the severe environment such as ocean.

The invention relates to a composite cement-based quick-setting dry material for maintaining plate ballastless tracks. The material comprises, by weight, 25% to 45% of composite cement, 7.8% to 15% of composite mineral admixtures, 0.05% to 0.1% of retarders, 0.05% to 0.11% of antifoaming agents, 0% to 0.01% of water-retaining agents, 0.26% to 1% of thickening agents, 0.1% to 0.16% of a water reducing agent, 0.05% to 0.1% of fibers and 46% to 62.5% of quartz sand. The invention further discloses quick-setting mortar which is manufactured by mixing, by weight, 83% to 86% of the dry material and 14% to 17% of water. The invention further discloses a process which comprises steps of material preparation, material mixing, hydration and the like. The composite cement-based quick-setting mortar can achieve gravity grouting, initial and final setting time intervals are short, early strength develops quickly, later strength is not decreased, no water is secreted, no sedimentation exists, the inflation is tiny, the anti-freezing performance is good, obvious contraction does not exist, and the like.

The aim of the invention is to utilize a grinding basalt fiber cement concrete material with good workability and physical mechanics performance and perfect durability. The material is formed by mixing, stirring and grinding of the following components in weight portion: 3 to 5 portions of basalt fiber, 180 to 400 portions of cement, 3 to 5 portions of cement-based capillary crystalline material, 120 to 180 portions of mineral admixture, 0 to 5 portions of water reducing agent, 1750 to 1850 portions of sandstone and 100 to 180 portions of water; when the material is applied to a road surface concrete, the material can improve the tensile strength, impermeability, cracking resistance, shock resistance, deformation resistance, frost resistance and anti-fatigue of the concrete road surface, and the material also has the advantages of easy construction, reasonable price and suitable popularization and application. The invention also provides a construction method for utilizing the grinding basalt fiber cement concrete material as a road surface.

The invention discloses an ultralow-density cement paste system for well cementing. The system comprises, by weight, 100 parts of oil well cement, 5-8 parts of micro silicon, 0-4 parts of oil well ultrafine cement, 25-40 parts of lightening materials, 2-5 parts of suspension stabilizer, 0-5 parts of coagulant, 1.0-1.2 parts of fluid loss agent, 1.0-1.5 parts of dispersing agent and 95-125 parts ofwater, wherein the particle size of the micro-silicon is 0.2-2 micron; the lightening materials comprise at least two of sodium bentonite, palygorskite, expanded perlite, hollow glass beads and hollow ceramic micro-beads. The ultralow-density cement paste system for the well cementing is suitable for well cementing operation of a low-pressure stratum which is likely to leak, and the manimum density can be 1.04 g/cm<3>. The ultralow-density cement paste system has the advantages of being rapid in setting at low temperature, rapid in strength development in the early stage, good in sedimentation stability and low in water loss.

The invention relates to construction waste recycled concrete, and belongs to the technical field of concrete. The construction waste recycled concrete comprises fly ash, stone powder, recycled coarseaggregate, recycled fine aggregate, an early strength agent, a water reducing agent, an air entraining agent and a reinforcing component, wherein the recycled coarse aggregate is formed by crushing and screening waste bricks; the recycled fine aggregate is formed by crushing and screening waste concrete; and the reinforcing component comprises basalt fibers, polypropylene reticular fibers, metakaolin and a CABR-MS605 corrosion inhibitor. According to the technical scheme, the impermeability of the recycled concrete can be improved.

The invention discloses nano-modified ultrahigh-strength steel fiber concrete and a preparation method thereof, and relates to the technical field of building concrete. The concrete disclosed by the invention is prepared from the following components in parts by weight: 370 to 420 parts of Portland cement, 80 to 120 parts of mineral powder, 30 to 50 parts of fly ash microbeads, 30 to 60 parts of silica fume, 12 to 20 parts of a high-performance water reducing agent, 40 to 160 parts of steel fibers, 0.05 to 0.25 part of graphene oxide, 3 to 20 parts of nano silicon dioxide, 600 to 800 parts of sand, 900 to 1100 parts of stones and 110 to 130 parts of tap water. The nano-modified ultrahigh-strength steel fiber concrete provided by the invention contains the substances such as the steel fiber, the graphene oxide and the nano silicon dioxide, so that the interface microstructure of set cement and aggregate can be improved, and the mechanical property, the impermeability and the durability of the concrete can be remarkably improved.

The invention discloses a waste high-magnesium rock flour-based composite mineral admixture and application of the same in high-strength concrete. A preparation method for the admixture comprises the following steps: (1) drying waste high-magnesium rock, wet discharged fly ash and manganese slag until water content is lower than 1.0%; and (2) separately grinding 70 to 85 parts by weight of the dried waste high-magnesium rock, 10 to 20 parts by weight of the dried wet discharged fly ash, 0 to 10 parts by weight of the dried manganese slag, 0 to 10 parts by weight of mineral waste residue and 0 to 10 parts by weight of clinker, and then carrying out mixing or carrying out mixing and then grinding until the specific surface area of the obtained mixture is 901 to 1200 m2/kg so as to obtain the waste high-magnesium rock flour-based composite mineral admixture. According to the invention, the morphological effect and filling effect of the waste high-magnesium rock flour are utilized to improve compactness of a concrete mixture and fluidity of concrete; slump loss is small, and adsorption of additives like polycarboxylic acid is low; and early strength of the concrete develops fast, and later strength of the concrete develops steadily. Moreover, both the admixture provided by the invention and coarse and fine waste high-magnesium rock aggregate can be applied in the concrete, so the utilization rate of the waste high-magnesium rock is substantially increased.

The invention relates to a high-performance alkali-free liquid accelerator and a preparation method thereof. The high-performance alkali-free liquid accelerator comprises the following components: 30-45% of active aluminum hydroxide, 3-15% of a fluorine-aluminum complex, 0.5-8% of an early strength coagulation accelerating component, 2-8% of an alcohol amine substance, 5-15% of a nano silica sol,0.5-2% of a dispersing agent and water. The high-performance alkali-free liquid accelerator disclosed by the invention can weaken adverse effects on later mechanical strength and durability of concrete while achieving a good accelerating effect, can effectively inhibit expansion cracking of the concrete, improves early strength and cement adaptability, and is low in dosage. The preparation methodis simple to operate and mild in condition.

The invention belongs to the technical field of concrete, and discloses special concrete for structural reinforcement and a preparation method thereof. The special concrete is prepared from cement, mineral powder, fly ash, silica fume, fine aggregate, coarse aggregate, a water reducing agent, a shrinkage compensation admixture, anti-cracking fibers and a binder. The special reinforced concrete hasthe characteristics of self-compaction, no segregation, fast early strength development, controllable later strength, low shrinkage and the like, fills the market vacancy of reinforced concrete, is classified according to use conditions, avoids using one product to cope with all the conditions, and is divided into a common type and an early strength type according to different ages reaching the design strength. The common type is suitable for newly-added components in transformation and reinforcement and the situation that concrete vibration is difficult in a beam column joint steel bar densearea, a post-cast strip, a constructional column and the like in a newly-built project. The early strength type is suitable for transformation and reinforcement of locally-added components with the increased cross section and the tight construction period and suitable for concrete replacement.

The invention provides a control method for a highest temperature interval of high-arch-dam low-heat cement concrete. The characteristics of the low-heat cement concrete are combined, and the advantages of the low-heat cement concrete can be exerted to improve the crack resistance safety of dam concrete, the influence on the joint grouting quality of the transverse joint due to too small opening degree of the transverse joint in the construction period of the arch dam caused by too low maximum temperature control of concrete can be prevented, and the arch sealing integrity of the arch dam is ensured; too low maximum temperature control of concrete can be prevented, and particularly, when the environment temperature in autumn and winter is low, the highest temperature of the low-heat cementconcrete is easier to be too low. After the lower limit value of the highest temperature of the concrete is set, the highest temperature can be properly increased by adjusting a concrete pre-coolingmeasure, a water cooling measure and the like, so that the temperature control cooling engineering quantity and investment are obviously saved; and after the highest temperature interval control standard is set, the temperature control operation on the concrete in the actual construction process is more flexible, and field construction control is facilitated.

The invention provides a silicon-aluminum gelatinized material produced by pulverized fuel ash and an application method thereof. In the method, a coal gangue is crushed and ground to obtain a powder body, and the powder body is calcined for 0.5 to 2 hours under the temperature of 500 to 750 DEG C, so as to obtain calcined kaolin clay. Ball milling is carried out on the pulverized fuel ash, lime and the calcined kaolin clay in a ball milling machine according to certain proportion so as to obtain pulverized silicon-aluminum gelatinized material, and then sealing and packaging are carried out. Uniform mixing is carried out according to certain proportion so as to obtain a solid additive, and then sealing and packaging are carried out. When in use, the additive is dissolved in water to prepare additive solution (the proportion of the using quantity of the silicon-aluminum gelatinized material, the additive and the water is 100: (5-10): (40-50), the additive solution is slowly added to the pulverized silicon-aluminum gelatinized material, on-site pouring or forming is carried out after uniform mixing, and then the maintenance is carried out to the specified age under normal temperature (equal to or higher than 20 DEG C). The invention has the following characteristics: sources of raw materials are wide, the production cost is low, the processing is simple, and the implementation and popularization are convenient.

The invention discloses a composite lightening material which comprises the following components in parts by weight: 100 parts of coal ash, 10-15 parts of expanding materials and 5-10 parts of toughening materials, wherein the particle size range of the coal ash is 5-10 microns. The invention also relates to a preparation method of the composite lightening material, and the preparation method comprises the following steps: i) carrying out smashing and ball milling on the coal ash through an overhang roll mill, classifying the smashed and ball-milled coal ash through a classifier, and collecting the coal ash with the particle size range of 5-10 microns after the classification to obtain modified coal ash; and ii) mixing the modified coal ash obtained in the step i) with the expanding materials and the toughening materials according to the proportion so as to obtain the composite lightening material. Meanwhile, the invention also discloses deep well composite cement paste and an application of the composite cement paste in well cementing of oil/gas wells.