79results about How to "Good shrinkage performance" patented technology

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 provides modified foaming ethylene propylene diene rubber which comprises the following components according to the weight percent: 100-150 of ethylene propylene diene rubber, 10-30 of polyolefine, 2-10 of active agent, 10-20 of plasticizing agent, 10-20 of strengthening agent, 1-20 of foaming agent and 1-10 of cross linking agent. The foaming ethylene propylene diene rubber not only maintains the advantages of tensile strength, corrosion resistance, paint inert resistance, ozone resistance and the like of the original foaming ethylene propylene diene rubber, is greatly improved in the contraction property and the stability over time, is greatly expanded in the application in high-precision field, and has larger economic value.

The invention provides a press polishing method of a plastered mesh cloth of an inner wall, relating to the technical field of the surface treatment of the inner wall of a building. The method comprises the steps of: treating a structural base layer; watering to thoroughly wet the base; painting interfacial agent; painting cement mortar at twice; pressing an alkali-proof mesh cloth into mortar which is dried at 70 percents with an iron trowel; rolling water with a rotary drum and engraving floor mortar with wood; press polishing with the iron trowel along the lengthways direction of the alkali-proof mesh cloth; and maintaining in a watering way. The method can play a better role in reducing wall face-painted cracks, prevent the painting face of the inner wall from cracking, control the horizontal cracks of the mortar, the vertical cracks among frame pillars and brick bodies, the cracks among different materials and the hollowness, and guarantee the planeness of the surface of the mortar.

The invention discloses basalt fiber composite reinforcement concrete and a preparation method thereof to mainly solve the problems of low strength, easy aging and poor compounding with concrete in the existing concrete. The basalt fiber composite reinforcement concrete comprises basalt fiber composite reinforcement and concrete, wherein the basalt fiber composite reinforcement is a fiber reinforcement material formed by surface treatment of basalt fibers, impregnation of composite resin and solidification; and the concrete comprises the following components: basalt short fiber, fly ash, clay,mountain gravel, quartz gravel medium sand, a water reducing agent, a zirconate coupling agent, and silicate cement. Through the above scheme, the basalt fiber composite reinforcement concrete provided by the invention achieves the purposes of good compounding between the basalt fiber composite reinforcement and concrete, and high strength, light weight and difficult aging of the basalt fiber composite reinforcement, and has very high practical and popularization values.

The invention provides an anti-knocking steel box beam bridge deck paving structure and a paving method and belongs to the technical field of traffic transportation and the field of protection of bridge engineering. In the structure, the upper layer is an asphalt concrete wearing layer and the lower layer is a GFRP (Glass Fiber Reinforced Polymer)-composite concrete anti-knocking pavement layer, namely, a waterproof layer (2) is arranged on a steel box beam orthotropic bridge deck slab (1); a lower adhesive layer (3) is arranged on the waterproof layer (2); the GFRP-composite concrete anti-knocking pavement layer (4) is arranged on the lower adhesive layer (3); an upper adhesive layer (5) is arranged on the GFRP-composite concrete anti-knocking pavement layer (4); the asphalt concrete wearing layer (6) is arranged on the upper adhesive layer (5). The paving method comprises the following steps: (a) derusting a steel bridge deck by sandblasting; (b) performing anticorrosive coating on the steel bridge deck slab, and arranging the waterproof layer in a sprinkling way; (c) forming the lower adhesive layer on the waterproof layer in a coating mode; (d) strapping a GFRP glass fiber reinforced bar net, and then pouring high-strength high-toughness light composite concrete; (e) carrying out vibrating and maintaining, and afterwards adhering a GFRP glass fiber reinforced sheet on the upper surface of the concrete layer; (f) laying coarse sand on a contact surface between the GFRP sheet and the asphalt pavement layer, and arranging the upper adhesive layer in a sprinkling way; and (g) laying the asphalt concrete wearing layer.

The invention discloses a preparation method of a fluorine-containing shrink-reduced polycarboxylate water reducing agent. The method particularly includes: 1) preparation of a polycarboxylate water reducing agent prepolymer: under effects of an initiator, a reducing agent and a chain transfer agent, performing a redox radical polymerization reaction to a carbonyl-containing monomer, an unsaturated acid monomer and an unsaturated macro-monomer to obtain a carbonyl-containing polycarboxylate water reducing agent prepolymer; 2) preparation of the fluorine-containing shrink-reduced polycarboxylate water reducing agent: performing a nucleophilic substitution reaction to the carbonyl-containing polycarboxylate water reducing agent prepolymer with a Prakash reagent (TMSCF3) to obtain the water reducing agent. The water reducing agent can significantly reduce surface tension and improve cement dispersibility, is high in shrinkage reducing performance on the basis of high water reduction, is good in compatibility with cement, is low in gas content when being applied to concrete, can effectively improve size stability of concrete and reduce shrinkage cracking and can improve the durabilityand service life of a concrete structure.

The invention discloses a geopolymer cementing material for pavement base based on multielement solid waste synergy and a preparation method of the geopolymer cementing material. The geopolymer cementing material is mainly characterized in that fly ash, slag, carbide slag and desulfurized gypsum are used as main materials, the characteristics of various solid wastes are fully played, and the geopolymer cementing material is prepared on the basis of the principle of the geopolymer cementing material by utilizing the synergistic enhancement effect of the solid wastes. Through three main procedures of drying, grinding and secondary uniform mixing, the geopolymer cementing material special for the pavement base is prepared, wherein various performance indexes of the geopolymer cementing material meet the requirements of JT/T 994-2015 Cement for Highway Engineering Pavement Base Stability. Compared with the traditional cement-stabilized pavement base material, the dry shrinkage of the cement-stabilized pavement base material is greatly improved, and the crack hazard of the pavement caused by the dry shrinkage of the base is obviously reduced. Meanwhile, a large number of road building materials can be saved, waste is fully utilized, energy is saved, environmental pollution is reduced, resources are saved, the environment is protected, the road quality is improved, and the green traffic development concept is met.

The invention discloses a composite modified cement stabilized regenerative aggregate base mixture and a preparation method thereof. The base mixture is prepared from the following raw materials in parts by weight: 100 parts of aggregate, 3 to 7 parts of cement, 0.09 to 0.49 part of composite modified material, 0.2 to 1.2 parts of rubber granules, 0.05 to 0.2 parts of basalt fibers and 5.6 to 6.6parts of water. The composite modified cement stabilized regenerative aggregate base mixture added with fibers and rubber has excellent mechanical strength, such as drying shrinkage, temperature shrinkage, frost resistance and compression resistance. The invention further discloses the preparation method for the composite modified cement stabilized regenerative aggregate base mixture added with fibers and rubber, the sources of the raw materials used by the preparation method are wide, prices are low, the preparation process is simple, and the preparation method has economic and social benefits.

The invention discloses an anti-cracking pattern conveyor belt. The anti-cracking pattern conveyor belt is characterized in that the anti-cracking pattern conveyor belt comprises the following raw material components in parts by weight: 25 to 35 parts of isoprene rubber, 25 to 35 parts of EPDM, 10 to 20 parts of polypropylene, 5 to 6 parts of trichloroethylene, 3 to 5 parts of stearic acid, 6 to 8 parts of white factice, 8 to 12 parts of carbon black N375, 7 to 9 parts of silicon oxide, 2 to 3 parts of super tackifying agent HMT, 4 to 6 parts of sulfur, 1 to 2 parts of a foaming agent, 0.6 to 0.8 part of DCP, 3 to 4 parts of rosin resin, 0.5 to 0.8 part of modifier magnesium methacrylate and 4 to 5 parts of p-tert-Butylphenol formaldehyde resin. According to the anti-cracking pattern conveyor belt, the advantages of the rubber raw material such as good corrosion resistance and good oxidation resistance can be reserved, the shrinkage property, the cracking resistance and the stability can be greatly improved; on the premise that the process viscosity is not reduced, the production efficiency is improved, the process loss is reduced, and the application range in the field of high precision can be greatly enlarged.

The present invention discloses a cement grinding aid. The grinding aid comprises the following compositions components in parts by weightmass: 60-65 parts of alkali slag, 10-15 parts of straw ash, 15-20 parts of steel slag and 5-10 parts of calcium lignosulphonate, and the compositions components contain the following substances in based on the total mass percentage of the cement grinding aid by mass percentage: 30-41% of calcium oxide, 28-35% of silicon dioxidesilica, 8-16% of aluminum oxidealundum, 6-12% of sulfur trioxide and 5-8% of carbamideurea. The preparation method comprises the ofllowng steps: fFirstly, uniformly mixing and stirring the alkali slag, the straw ash, the steel slag and the calcium lignosulphonate are mixed and uniformly agitated; secondly, the mixture is preparing the mixture ed into spherical particles; lastlyand finally, stacking and curing the spherical particles are subjected to stacking, solidification and removing free water and partial part of water of crystallization removal, as a result to obtain, the a cement grinding aid is obtainedproduct. The cement grinding aid disclosed by the present invention is low in production cost, and good in product performance.

The invention discloses a shrinkage-reducing cracking-resistant reinforcing agent, C50 machine-made sand concrete and a preparation method. The shrinkage-reducing cracking-resistant reinforcing agentcomprises a mother liquor and a compounding material; the mother liquor is prepared from 2-4% of methoxy polyethylene glycol, 4-8% of methacrylic acid, 3-5% of glacial acetic acid, 1-2% of tetrabutyltitanate, 2-5% of anhydrous ethanol, 2-4% of a reinforcing agent, 2-5% of HEA, 0.5-1.0% of a composite molecular weight regulator thiohydracrylic acid, 30-50% of allyl polyoxyethylene ether, 1-2% of rosin, 4-7% of alkylbenzene sulfonate, 1-2% of triethanolamine, 0.5-1.0% of silicone, 0.05-0.08% of VC and the balance water; the compounding materials are selected from one or more of magnesium powder, triethanolamine, methylcellulose, sodium citrate, sodium gluconate, sodium thiosulfate, iron sulfate and aluminum sulfate. The workability, fluidity and shrinkage resistance of the concrete are effectively improved.

The invention discloses a bamboo fiber lime sand brick. The bamboo fiber lime sand brick comprises the following components in parts by weight: 30-40 parts of fly ash, 7-13 parts of quicklime powder, 50-60 parts of recycled fine aggregate, 3-7 parts of bamboo fiber and 2-5 parts of admixture. The bamboo fiber lime sand brick makes full use of construction wastes, so that resources can be effectively saved, the economy is good and the sustainable development of the construction industry is facilitated. The bamboo fiber is added into mortar, so that the compactness of the lime sand brick can be effectively improved, the strength of the lime sand brick is effectively improved, and the lime sand brick has good waterproof performance.

The invention discloses an optical transparent broadband high-wave-absorbing-rate wave absorber which is composed of N * M wave absorber units arranged in an array. Each wave absorber unit comprises a top PET dielectric layer, a middle PET dielectric layer, a bottom PET dielectric layer and a middle air layer. Each dielectric layer comprises a dielectric plate and a patterned ITO resistive film layer printed on the dielectric plate, and the bottom PET dielectric layer further comprises a bottom ITO resistive film layer; the ITO resistive film layer pattern of the top PET dielectric layer is of a square bent ring structure; patterns of the middle PET dielectric layer and the ITO resistive film layer are regular octagonal rings and internal interdigital structures; patterns of the bottom PET dielectric layer and the ITO resistive film layer are of a square ring structure; according to the wave absorber unit, multi-frequency-point superposition is achieved through structures of different sizes, broadband, high-efficiency wave absorption and high light transmittance are both considered in a broadband, and good RCS reduction performance is achieved.

The invention discloses a preparation method for bi-component cement-based repairing mortar, and belongs to the technical field of the building materials. The preparation method comprises the following steps: firstly smashing corn straw, and uniformly mixing with secondary sedimentation tank activated sludge, yellow sand and so on, collecting filter cakes after anerobic fermentation, and mixing the filter cakes with the cement, talcum powders and calcium chloride solution according to the proportion and obtaining a component A, calcining rice husks in the high temperature after fermentation, dissolving the calcined rice husk ash in sodium hydroxide solution, removing impurities through filtering, spin-steaming, concentrating and obtaining a component B, mixing the component A and the component B according to the proportion in use, and obtaining the bi-component cement-based repairing mortar. The prepared repairing mortar has good interfacial compatibility with the former concrete, and can be adequately permeated into holes. The cementation is firm, and the intensity and service life of the concrete are improved.

The invention discloses a preparation method of a polymer steel slag cement concrete. The method comprises preparing polyphenylene sulfide emulsion; in a liquid-after-solid sequence, uniformly mixing,by weight part, 5-30 parts of cement, 10-40 parts of steel slag, 14-26 parts of sand, 10-30 parts of gravel, water reducer 0-0.3% as heavy as the steel slag, defoamer 0-3% as heavy as polyphenylene sulfide, 10-25 parts of the polyphenylene sulfide emulsion and 15-25 parts of water inside a mixing container to prepare the polymer steel slag cement concrete. The prepared polymer steel slag cement concrete reduces the content of alkali and chlorine ions, increases the rupture strength, the compressive strength and the bending-pressing ratio, significantly enhances strength as well as tenacity, achieves high wearing resistance and is good in durability when applied to road and bridge pavement.

The invention relates to high-crack-resistance foam concrete and a preparation method thereof. The high-crack-resistance foam concrete is prepared from the following components in parts by mass: 500 to 1800 parts of cementing material, 1 to 5 parts of water-absorbent resin, 100 to 500 parts of aggregate, 60 to 300 parts of weakly alkaline water, 250 to 900 parts of water, 1 to 5 parts of nano reinforced foaming agent and 2 to 10 parts of plant fiber. The preparation method comprises the following steps: 1) uniformly stirring the cementing material, the water-absorbent resin and the water in proportion to obtain slurry; 2) gradually adding aggregates and plant fibers into the slurry prepared in the step 1) on the basis, and stirring to form a slurry mixture which is fully stirred and rich in aggregates and plant fibers; 3) mixing the nano-reinforced foaming agent with weakly-alkaline water to generate foam, adding the foam into the fully-stirred slurry mixture rich in aggregate and plant fibers, and continuing to stir uniformly so that the foam is uniformly distributed in the slurry to form foam concrete slurry; and 4) pouring the foam concrete slurry into a mold, covering, and demolding after the foam concrete is solidified and hardened.

The invention discloses a preparation method of a polymer foundation soil consolidation agent. The preparation method comprises following steps: a modified triisopropanolamine solution is prepared; methacrylic acid and N-isopropyl acrylamide are mixed at room temperature at a ratio of 1:2-3; cement, steel slag, a water reducer, and an anti-foaming agent are introduced into a homogenizer reaction vessel containing the modified triisopropanolamine solution in a manner that solid material first and liquid material second; the mixture of methacrylic acid and N-isopropyl acrylamide is added, and uniform stirring is carried out in the homogenizer reaction vessel so as to obtain the polymer foundation soil consolidation agent. The polymer foundation soil consolidation agent is capable of solidifying mud, mud powder soli, soft soil, muck, and the like with a water content ranging from 10 to 70%, and especially can be used for solidifying soil with an organic matter content lower than 30%, so that coagulable solid application range is widened, consolidated product compressive modulus of resilience and unconfined compressive strength are increased obviously, and it is ensured that without adding of broken stone, the consolidated is capable of providing higher foundation carrying capacity for upper engineering construction.

The invention relates to the field of concrete admixtures, in particular to a shrinkage-reducing ether polycarboxylic acid water reducer and a preparation method thereof. The reduction type ether polycarboxylic acid water reducer is characterized by comprising an esterification product, an ether macromonomer, acrylic acid, an unsaturated ester monomer and a functional monomer B, the esterification product is mainly obtained by performing esterification reaction on a functional monomer A and unsaturated acid; the functional monomer A is a monomer with a benzene ring, borate and hydroxyl; the functional monomer B is a monomer with a double bond, a benzene ring, a borate radical and a fluorocarbon bond. The shrinkage-reducing ether polycarboxylic acid water reducer provided by the invention can effectively reduce the surface tension of concrete, has better dispersing capacity, and can obviously improve the shrinkage-reducing effect of the concrete. Meanwhile, the hydration speed of the concrete can be further delayed, shrinkage cracking caused by temperature is prevented, and good application prospects and popularization value are achieved.

The invention relates to a gypsum-based wall leveling material as well as a preparation method and a use method thereof. The wall leveling material is prepared from the following raw materials in parts by mass: 55-70 parts of semi-hydrated gypsum; 8-20 parts of fly ash; 4-8 parts of an admixture; 4-8 parts of calcium hydroxide; 3-6 parts of zeolite; 0.2-0.5 part of a water retaining agent; and 0.05-0.1 part of a retarder; wherein the admixture is selected from one or two of silica fume or metakaolin. The gypsum-based wall leveling material provided by the invention does not need cement, redispersible rubber powder and a water repellent, can also have good water resistance, can maintain good mechanical properties in a high-humidity environment, can also solve the problems of hollowing and cracking of a wall surface, and is low in cost and easier to apply and popularize.

The invention relates to the technical field of building materials, in particular to a high-strength water-resistant soil consolidation agent which comprises Portland cement, composite ultrafine powder, an accelerator, polymer cellulose, modified polypropylene and alkali-free glass fibers. Compared with the prior art, the high-strength water-resistant soil consolidation agent provided by the invention has the advantages that a consolidation product obtained after soil consolidation has relatively large capillary volume density, so that the composite ultrafine powder is further promoted to participate in hydration reaction compounding; the ultrafine powder and the alkali-free glass fiber are doped into the cement consolidated soil to play a filling effect; the permeability of cement consolidated soil is reduced; the air shrinkage performance of the cement solidified soil is improved; the doping of the polymer cellulose and the modified polypropylene can effectively relieve and reduce the corrosion speed of the cement consolidated soil and inhibit, prevent and delay the electrochemical reaction of steel bar corrosion, so that the service life of the cement consolidated soil structureis prolonged, the later strength is stably developed, and the growth rate of the cement consolidated soil structure is obviously superior to that of common consolidated soil along with the increase of age.

The invention relates to a reduction type polycarboxylic acid water reducer as well as a preparation method and application thereof. The water reducer is prepared from the following raw materials: an unsaturated polyether macromonomer, an unsaturated acid monomer and a reduction type functional monomer, and further comprises an initiator, a chain transfer agent and deionized water, wherein the molar ratio of the unsaturated polyether macromonomer to the unsaturated acid monomer to the reduction type functional monomer is 1: (4-6): (2-5). Isopentenyl polyoxyethylene ether, the unsaturated acid monomer, the reduction type functional monomer, the chain transfer agent, the initiator and the deionized water are adopted, and the polycarboxylic acid water reducer with high water-reducing rate and excellent shrinkage-reducing performance is prepared by a free radical copolymerization method through molecular structure design. The water reducer is used for reducing the shrinkage rate of a cementing material, and the mixing amount of the water reducer in the cementing material is 0.1-0.2% of the mass of the cementing material. Compared with the prior art, the reduction type polycarboxylic acid water reducer has the advantages of low doping amount, excellent reduction effect, simple synthesis process, energy saving, environmental protection and the like.