1183 results about "Cement mortar" patented technology

The invention discloses material conveying equipment for construction, and relates to the technical field of material conveying, the material conveying equipment comprises a supporting frame, a conveying belt is fixedly connected to the top of the supporting frame, a conveying mechanism is arranged at the top of the conveying belt, and through the arrangement of the conveying mechanism, when materials are placed on the conveying belt, the materials are lapped on an opening and closing supporting plate; the opening and closing supporting plate is in an upwarp state, so that the materials are supported, the materials can be supported through the opening and closing supporting plate when being conveyed on the inclined conveying belt, the problem that the materials slide down obliquely from the inclined conveying belt along with gravity is avoided, and the stability of conveying the materials from bottom to top is guaranteed; and the surface of the cement mortar bag can be automatically cleaned under the swinging action of the opening and closing supporting plate, the problem that the cement mortar bag falls off from the conveying belt due to unstable placement when the cement mortar bag is subsequently placed is avoided, and then the stability of transportation work is guaranteed.

The invention relates to the technical field of cement mortar compositions, and particularly discloses a double-component anti-freezing early-strength slurry and a preparation method and application thereof. The double-component anti-freezing early-strength slurry provided by the invention is composed of a component A and a component B in a weight ratio of 25: (4-10), the component A is prepared from the following components in parts by weight: 250 to 280 parts of Portland cement, 90 to 100 parts of admixture, 145 to 165 parts of sand and 6.4 to 8.4 parts of water reducing agent; and the component B comprises the following components in parts by weight: 8-10 parts of a sodium nitrite antifreeze agent, 50-58 parts of a reinforcing aid, 32-40 parts of anhydrite, 240-270 parts of an admixture, 155-175 parts of sand and 4.1-6.1 parts of a water reducing agent. By utilizing the technical scheme, the prepared double-component anti-freezing early-strength slurry has the advantages of rapid development of early compressive strength and stable growth of later compressive strength under different ultralow temperature conditions.

The invention discloses a method for preparing high-performance cement mortar based on NaOH activated coal gangue, which comprises the following steps: putting preliminarily crushed coal gangue into a rod mill for crushing and screening to obtain undersize coal gangue and oversize coal gangue; calcining the treated coal gangue, and putting the calcined product into a rod mill for fine grinding to obtain an admixture; weighing the admixture and the cement in proportion, and uniformly stirring and mixing to obtain a cementing material; the preparation method comprises the following steps: pouring a cementing material and gravel into a stirrer according to a mortar ratio, uniformly stirring, dissolving an exciting agent NaOH and a water reducing agent into water, pouring into the stirrer, and uniformly stirring the mixed materials to obtain the final high-performance cement mortar. The coal gangue is calcined and ground by a rod mill to serve as the admixture to replace part of the Portland fly ash cement, and the exciting agent NaOH is added, so that the bending strength and the compressive strength of a test piece added with the exciting agent NaOH are increased, and the admixture is effectively excited and activated by the NaOH.

The invention belongs to the technical field of building waterproof material detection, and particularly relates to a polymer cement waterproof coating performance detection system which is characterized in that a to-be-detected polymer cement waterproof coating is coated on the surface of a cement mortar base material to form a coating layer, and after standard curing, the circumferential edge of the base material is sealed to limit a detection area; increasing the water pressure of the detection area in stages, synchronously acquiring surface strain data and water content data in the base material, dynamically constructing a permeation path map in the base material in a water pressure loading process, calibrating a permeation path starting point and analyzing permeation behavior parameters, counting the distribution proportion of a permeation path starting point in the center and the edge to judge a potential sealing interference risk, verifying edge permeation abnormality in combination with strain data when the potential sealing interference risk exists, rejecting non-coating performance related parameters, integrating and correcting a permeation behavior parameter set, and outputting an evaluation result after matching according to an anti-permeability grade standard. And comprehensive and accurate dynamic analysis of the penetration behavior is realized on the basis of eliminating the edge sealing interference influence.

The utility model relates to a lighting, heat-insulating and waterproof window well of a building and belongs to the technical field of window wells. Comprising a basement wall and a lighting assembly, window wells are arranged on the basement wall, the lighting assembly comprises lighting windows and suspended ceilings, the lighting windows and the suspended ceilings are located at the tops and the bottoms of the window wells respectively, the window wells comprise the upper window wells and the lower window wells, and the lower window wells are in a horn shape; a waterproof heat preservation assembly is arranged between the window well and the basement wall, a drainage pipe penetrating through the waterproof heat preservation assembly is arranged in the basement wall, the waterproof heat preservation assembly comprises a waterproof roll layer, a cement mortar smearing layer and a graphite polystyrene board, and the cement mortar smearing layer and the graphite polystyrene board conduct heat preservation on the window well. According to the building daylighting heat-preservation waterproof window well, the daylighting efficiency and uniformity are improved through the design of the outwards-convex-pyramid-shaped daylighting window and the horn-shaped lower window well, the waterproof heat-preservation assembly is combined with the graphite polystyrene board, heat transfer is effectively prevented, the heat-preservation performance is enhanced, and meanwhile the waterproof effect is improved through the waterproof roll layer and the cement mortar smearing layer.

The invention relates to the technical field of mortar, in particular to cement self-leveling anti-crack and anti-seepage mortar and a preparation method thereof. The cement self-leveling anti-cracking and anti-seepage mortar is prepared from the following raw materials in parts by mass: 50 to 70 parts of Portland cement, 70 to 90 parts of quartz sand, 5 to 10 parts of nano metakaolin, 1 to 3 parts of calcium sulfate, 5 to 10 parts of polyethylene fiber, 1 to 2 parts of nonionic surfactant, 1 to 2 parts of silane coupling agent, 3 to 8 parts of composite basalt fiber, 0.5 to 1.5 parts of polycarboxylate superplasticizer and 1 to 3 parts of defoaming agent. 1-3 parts of hydroxypropyl methyl cellulose, 1-2 parts of a retarder and 0.5-1.5 parts of a coagulant. The mortar material has good anti-cracking performance and anti-seepage performance and excellent durability, can effectively solve the problem that the anti-cracking performance and the anti-seepage performance of the mortar material in the prior art cannot meet the environmental requirements, and is suitable for large-scale popularization and application.

The invention discloses an aggregate random distribution concrete PFC (Power Factor Correction) simulation method, which comprises the following steps: a model selection step: determining a parallel bonding model as a mechanical model for concrete material simulation; a cement mortar matrix generation step of generating a cement mortar matrix by using particles in a set size range in a set space range based on the model, and setting pore density, particle density and contact model parameters; a coarse aggregate random distribution simulation step: randomly covering and grouping original particles in the matrix in a grouping and range mode; a concrete numerical model construction step: determining particle classification so as to distinguish cement mortar and coarse aggregate; and a model reliability verification step: comparing indoor test results through a uniaxial compression test. According to the method, the simulation accuracy is improved, the randomness of aggregate is reduced, the model reliability is ensured, the matrix simulation refinement degree is improved, and a method is provided for concrete modeling and performance research.

The invention discloses modified slag fiber reinforced cement mortar and a preparation method thereof. According to the invention, the modified slag fiber is adopted as a reinforcement body, and the method has the advantages of reasonable utilization of solid wastes, low energy consumption, low cost, environmental protection, high mechanical properties of a mortar test piece, small shrinkage cracking and the like. The nano silica sol is adopted to modify the slag fibers, so that the durability of the slag fibers in a cement material can be better improved, hydration products on the surfaces of the fibers can be distributed more uniformly and densely, and an interface transition area between the fibers and a matrix material is reinforced, so that the strength of the mortar is remarkably improved; the used slag fiber is a fibrous material prepared by taking blast furnace slag and fly ash as raw materials through a blowing or centrifugal thread throwing process, so that the solid waste utilization rate can be increased, and environmental governance and protection are facilitated. According to the implementation of the invention, on one hand, the practical application of the slag fiber in the cement matrix material is explored; on the other hand, solid waste utilization can be promoted.

The invention discloses an anti-cracking cement mortar containing slag and a preparation method thereof, and relates to the technical field of slag cement mortars.The anti-cracking cement mortar is prepared from, by mass, 100 parts of a slag cement raw material, 39-44.5 parts of water, 0.6-1 part of a polycarboxylic acid water reducing agent, 0.3-0.5 part of a super absorbent polymer, 4-5 parts of an exciting agent and 0.03-0.05 part of multi-walled carbon nanotubes; the preparation method of the anti-cracking cement mortar comprises the following steps: premixing the slag cement raw material, the super absorbent polymer and the multi-walled carbon nanotubes for 1-2 minutes, sequentially adding the water, the polycarboxylic acid water reducing agent and the exciting agent, mixing at a low speed for 1-2 minutes, and mixing at a high speed for 3-5 minutes to obtain the anti-cracking cement mortar.

The invention relates to the technical field of bamboo winding composite material pipelines, and discloses a bionic bamboo joint connector of a bamboo winding pressure pipeline and a processing technology of the bionic bamboo joint connector, the bionic bamboo joint connector is arranged at the connecting part of two sections of axially aligned bamboo winding pipelines, and the bionic bamboo joint connector sequentially comprises an inner lining layer and an outer lining layer from inside to outside, the embedded steel bar reinforcing layer consists of a reinforcing material and embedded steel bar glue; the film covering restraint layer is composed of fiber reinforced cloth and impregnating resin; the socket fastening layer is composed of a metal fastening piece which is connected with the two pipes in a bridging mode. A protective layer is poured, and the whole connector is wrapped with polymer modified cement mortar; the invention further provides a processing technology of the bionic bamboo joint connector. The processing technology comprises the following six steps of pretreatment, lining welding, embedded steel bar reinforcement, film covering constraint, socket fastening and pouring protection. Through the composite structure of crossed truss type embedded steel bars, polymer modified mortar pouring and socket fastening, the connector obtains high connection strength, excellent anti-drawing performance and long-term durability.

The invention relates to phase change concrete and a preparation method thereof. The concrete comprises the following components by kg / m < 3 >: 450-650 of Yunnan concrete stone; 200 to 400 parts of phase change aggregate; 450 to 550 parts of cement; 40-60 parts of silica fume; 600 to 800 parts of common sand; 5-7 parts of a high-efficiency water reducing agent; and 120 to 140 parts of water. The method comprises the following steps: 1, drying cloud concrete stone needing to pre-adsorb a phase change material in a drying oven until the weight is constant; 2, drying the paraffin phase change material into a liquid state, putting the cloud concrete stone into the liquid paraffin, and carrying out vacuum adsorption; 3, performing third-time modification on the cloud concrete stone after paraffin adsorption by using ultra-high-performance cement mortar twice and foam mortar once respectively; 4, performing saturated surface dry water absorption treatment on the unadsorbed phase-change material cloud concrete stone; and 5, pouring the Yunnan concrete stone, the phase-change aggregate, the cement, the silica fume and the common sand into a concrete mixer, and uniformly mixing to obtain the phase-change concrete.

The invention discloses a method and a system for predicting the optimal ratio of fiber-reinforced environment-friendly cement mortar based on machine learning. The method comprises the following steps: collecting experimental data, and carrying out data preprocessing; screening features of extremely strong correlation and strong correlation by using a Pearson correlation coefficient; constructing a bidirectional gating circulation unit network prediction model based on an attention mechanism, extracting features through a bidirectional GRU layer, and weighting key information through an attention layer; training the model by adopting an adaptive moment estimation optimization algorithm, and performing hyper-parameter tuning in combination with a Bayesian optimization algorithm; and after the target performance index is input, the model outputs an optimal ratio combination meeting the requirement. The system comprises a data acquisition and preprocessing module, a feature screening module, a model construction and training module, a hyper-parameter tuning module and an optimal ratio prediction module. According to the method, the attention mechanism and the bidirectional GRU are fused, so that the prediction precision is improved, and an efficient and reliable solution is provided for proportioning optimization of the environment-friendly cement mortar.

The invention belongs to the technical field of base pouring, and particularly relates to a wind power equipment mounting base pouring device and method.The wind power equipment mounting base pouring device comprises a slurry collecting box, a pipe head butt joint cylinder arranged on the surface of one side of the slurry collecting box, and a supporting hollow column fixedly mounted on the edge of the bottom of the slurry collecting box; the slurry conveying pipes are fixedly installed on the surface of the bottom of the slurry collecting box and located at the peripheral edge positions, lap joint supporting plates are arranged on the surfaces of the outer sides of the slurry conveying pipes, and the surfaces of the tops of the supporting hollow columns are fixedly connected to the middle positions of the bottoms of the lap joint supporting plates. An output pipe of the mortar conveying pump truck is in butt joint with the pipe head butt joint cylinder, cement mortar is poured into the flow guide pipe, and along with continuous accumulation of the mortar in the mortar collecting box, the liquid mortar can gradually spread around due to gravity, so that the cement mortar can be conveyed to the mortar collecting box. And meanwhile, mortar in the mortar collecting box is poured and discharged in cooperation with a mortar conveying pipe on the surface of the bottom of the mortar collecting box, and workers stand on the surface of the steel bar frame to pull and swing one end of the mortar conveying pipe in cooperation.

The invention discloses a gas and coal spontaneous combustion co-treatment technology under the shallow-buried close-distance coal seam group upward mining condition, and belongs to the technical field of coal mine safety mining. The method comprises the following steps of: constructing a ground well on a coal seam group on the ground, pre-pumping gas of an upper coal seam, mining the upper coal seam after coal and gas outburst danger is eliminated, synchronously utilizing the ground well to pump gas in a front disturbance area and a rear goaf of a working face during mining, injecting cement mortar into the working face by utilizing the ground well above the goaf every time the working face is propelled by 50-60m, spontaneous combustion of residual coal in the goaf is inhibited and overlying strata sinking is reduced. After the upper coal seam is mined and cement mortar in the goaf is solidified, the ground well extends to the middle coal seam and the lower coal seam, and gas pre-extraction, coal seam mining and cement mortar injection are conducted in sequence through the method. According to the technology, gas pre-extraction, coal mining, grouting and other procedures are matched in an echelon mode, gas and coal spontaneous combustion disasters of the shallow-buried close-distance coal seam group can be effectively treated, surface subsidence is reduced, mine production safety is guaranteed, meanwhile, operation is easy, and cost is saved.

The invention relates to the technical field of cement mortar test mold automatic forming equipment, and discloses a cement mortar test mold automatic forming production line. Comprising a cement mortar test mold automatic forming equipment system, a cement mortar test mold automatic robot curing box equipment system, a cement mortar test mold automatic demolding and demolding equipment system, a cement mortar test mold automatic test mold cleaning equipment system and a cement mortar test mold automatic mold filling equipment system. The cement mortar test mold automatic molding equipment system is used for completing molding of a cement mortar test block in the assembled test mold to form a molded test mold; the cement mortar test mold automatic robot curing box equipment system is used for curing a forming test mold; the automatic forming production line for the cement mortar test mold solves the problems that an existing cement mortar test mold is low in efficiency, unstable in quality, large in labor intensity and large in test mold loss during manual operation from assembling, forming, mold stripping to cleaning.

The invention discloses high-toughness and high-adhesion polymerized modified cement mortar with iron-ore slag and a preparation method of the high-toughness and high-adhesion polymerized modified cement mortar, and belongs to the technical field of concrete structure repair materials. High-strength, high-toughness and high-adhesion polymer modified mortar is formed, and the requirements of rapid repair engineering of a cement concrete structure for toughness and adhesion performance are met; the iron-ore slag is adopted to replace part of carborundum as the aggregate, so that the early strength of the mortar is ensured on the premise of meeting sustainable development, and the basic requirements of concrete structure repair are met; meanwhile, the fiber, the redispersible latex powder and the modified rubber powder are added, so that the toughness of the material is improved, the bonding performance is improved, and the stress coordination of the repairing material and an original concrete structure is guaranteed.

The utility model relates to a tunnel portal advance pipe shed structure, and relates to the technical field of tunnel construction.The tunnel portal advance pipe shed structure comprises multiple sets of mounting holes formed in a tunnel portal guide wall at intervals and pipe shed steel pipes facilitating concrete pouring in the mounting holes, and multiple sets of grouting holes are formed in the pipe shed steel pipes; the utility model discloses a reinforcement cage for improving pipe shed steel pipe supporting strength. The pipe shed steel pipes are installed in the installation holes in a sealed mode, the reinforcement cage is installed in the pipe shed steel pipes, meanwhile, the reinforcement cage does not affect pouring of cement mortar in the pipe shed steel pipes, and then gaps between the pipe shed steel pipes and the installation holes are tightly filled with the cement mortar through the pipe shed steel pipes; the interiors of the pipe shed steel pipes are jointly supported through the reinforcement cage and the cement mortar, then the rigidity and strength of a single set of pipe shed steel pipes are improved, the multiple sets of pipe shed steel pipes jointly form the advance pipe shed, finally, the supporting acting force of the advance pipe shed on a soil body at a tunnel portal is improved, and the probability that the pipe shed deforms is reduced.

The invention provides a safe and efficient combined mining method for a near-surface thick and large low-grade ore body under a broken ore rock condition, and belongs to the field of mining. The first-step stope adopts a downward large-diameter deep hole subsequent filling method, horizontal and vertical anchor cable holes are constructed in a drilling chamber at the top of the stope, and the vertical anchor cable holes are communicated with the ground surface; a subsection medium-length hole subsequent filling mining method is adopted in the stope in the second step, and downward anchor cable holes are constructed in the earth surface above the stope to the boundary of the ore body; after cement mortar is injected into the anchor cable holes, orifice anchor cables are connected in series, prestress is applied, and a combined anchor cable supporting system is formed; filling immediately after the stope is mined in the first step; and after the filling body reaches the preset strength, filling after mining is carried out on the second-step stope. Through application of the combined supporting structure and the mining technology, near-surface thick and large low-grade ore body resources can be safely and efficiently mined, underground occurrence resources are fully utilized, and continuous high-quality development of mine enterprises is guaranteed.

A sea area stratum shield tunneling grouting intelligent management and control system and method comprises a storage subsystem, a pipeline subsystem and a grouting front-end subsystem, and a cement mortar storage system and an accelerator storage system are connected with a synchronous grouting front-end system and a secondary grouting front-end system through a synchronous grouting pipeline and a secondary grouting pipeline. And the synchronous grouting front-end system and the secondary grouting front-end system control the flow and the speed in the pipeline through an electric control valve. Automatic control and synchronous grouting evaluation indexes are adopted, the effects of synchronous grouting and secondary grouting can be effectively improved, the grouting quality is improved, building gaps can be filled in time, stratum deformation can be effectively controlled, the settling volume of a tunnel is reduced, and the anti-seepage and waterproof effects of the tunnel can be improved; the synchronous grouting accelerator is automatically added, the adding rate can be accurately controlled, and accurate metering can be achieved; the residual amount of the grouting materials is automatically checked after each ring in the shield tunnel is tunneled, and the ground terminal can timely prepare the quantity of the materials of the next ring according to real-time data.

The invention relates to prestressed pipe pile coarse aggregate ultra-high performance concrete and a preparation method thereof, in the prestressed pipe pile coarse aggregate ultra-high performance concrete, each cubic meter of concrete comprises the following components: 380 to 600 kg of cement, 50 to 150 kg of silica fume, 30 to 100 kg of microbeads, 500 to 800 kg of sand, 900 to 1200 kg of modified coarse aggregate, 8 to 25 kg of a water reducing agent, 0.8 to 2.0 kg of a defoaming agent, 100 to 170 kg of water and 40 to 240 kg of steel fiber; the modified coarse aggregate comprises gravels coated with a graphene film. The surface of the modified coarse aggregate is coated with a layer of graphene, the interface transition area of the aggregate and cement mortar can be improved, the compressive strength and erosion resistance of concrete can be improved, the durability of the tubular pile can be improved, the service life of the tubular pile structure can be prolonged, and the maintenance cost can be reduced.

The invention discloses phase change temperature control composite mortar and a phase change temperature control anchor rod construction method, and belongs to the technical field of underground engineering surrounding rock supporting. The phase change temperature control composite mortar comprises cement, fine sand, water, a phase change material and heat conduction powder; the construction method comprises the following steps: drilling an excavated bed rock to form an anchor rod drill hole; a sectional type anchor rod is arranged in the anchor rod drill hole in a penetrating mode, wherein the sectional type anchor rod is divided into an anchoring section and a non-anchoring section; cement mortar is used for grouting the anchoring section through a grouting pipe, and grouting is stopped when the interface between the anchoring section and the non-anchoring section is reached; and after the slurry of the anchoring section is hardened, the phase-change temperature-control composite mortar is heated, then the phase-change temperature-control composite mortar is injected into the non-anchoring section through the grouting pipe, the single-hole grouting pressure reaches the designed final pressure, grouting continues for a period of time, and then grouting is ended. The method can adapt to frequent changes of surrounding rock temperature, and surrounding rock damage and anchor rod failure caused by temperature stress accumulation of surrounding rock are avoided.

The invention relates to the technical field of data processing, and discloses a high-confining-pressure blasting model test method and system for simulating a single-free-surface clamping effect. The method comprises the following steps: preparing a single-free-surface model sample with a preset blast hole by regulating and controlling the proportion of cement mortar, performing three-way constraint loading by utilizing a hydraulic confining pressure system to form a stable clamping state, and filling trace explosive and blocking and sealing the hole to construct a complete blasting model. Multi-parameter synchronous monitoring is adopted to collect vibration waveform and confining pressure change data, and a time-frequency domain analysis algorithm is applied to identify a single free surface clamping effect and obtain blasting failure mode parameters under the influence of confining pressure. The technical problem that an existing blasting model test cannot accurately simulate the single-free-surface clamping constraint condition of underground engineering and cannot quantitatively recognize the influence rule of confining pressure on a blasting failure mode is solved.

The invention relates to the field of buildings, in particular to a laminated construction method for combining prefabricated pipe pieces and prefabricated linings. The method comprises the following steps that a prefabricated pipe piece and a prefabricated lining are combined to achieve overlapping construction; the concrete grade is the same as or does not exceed one concrete grade difference with the prefabricated pipe piece, and the prefabricated lining and the prefabricated pipe piece are combined into an overlapped structure in any one of the connection modes of embedded steel bar connection and embedded sleeve and stainless steel bolt pair connection; a gap is reserved between the prefabricated lining and the prefabricated pipe piece, the end is blocked by a steel plate or a concrete block, a grouting hole is reserved in the bottom, and an exhaust hole is reserved in the top; and after the jacking of the two parts is completed, grout such as non-shrinkage or micro-expansion cement paste and cement mortar is filled in the gap.

The invention discloses a cement mortar reinforcing agent and a preparation method thereof, relates to the field of cement mortar reinforcing agents, and is characterized in that the limit ranges of the DEAIPA dosage (15-20 parts), the titanate coupling agent hydrolysis time (3-5 hours) and the main mixing reaction temperature (60-70 DEG C) are controlled. A titanate coupling agent is hydrolyzed at specific pH and temperature until the conversion rate of-SiOR groups is high, sodium polyacrylate adsorbs sodium bicarbonate to form CO2-loaded microspheres, then the CO2-loaded microspheres are mixed and reacted with raw materials such as calcium formate and DEAIPA at limited temperature, and finally the reinforcing agent is prepared. Ten groups of contrast experiments are designed for verification: 1-5 groups are conventional groups with parameters within a limited range, 6-9 groups are control groups with parameters exceeding the range, and 10 groups are traditional raw material blank groups. Experiments show that the 3-day / 28-day compressive strength and the total shrinkage rate of a conventional group are remarkably superior to those of an out-of-range group and a blank group, a nonlinear relation exists in the synergistic effect of parameters, and it is proved that the limited range has practical significance for improving the mechanical property and the crack resistance of the low-clinker cement.

The utility model relates to cement mortar fluidity accurate measuring equipment which comprises a base, a jumping table, a supporting frame, a first lead screw, a second lead screw, a connecting pipe, a hanging rod, a sliding rod, a first sliding seat, a second sliding seat, a laser indicator, a laser range finder and a receiver, the jumping table is arranged on the upper surface of the base, and the supporting frame is vertically arranged above the jumping table. The first lead screw and the second lead screw are horizontally, symmetrically and rotationally arranged on the upper portion in the supporting frame, and the sliding rod is horizontally arranged above the lead screws. The first sliding seat and the second sliding seat are arranged on the first lead screw and the second lead screw in a sleeving mode respectively and are in threaded connection, and the sliding seats are arranged on the sliding rod in a sleeving mode. And laser indicators are fixed on the lower end surfaces of the first sliding seat and the second sliding seat, and light emitting ports of the laser indicators face downwards. And the laser range finder is arranged in the first sliding seat. The measuring equipment disclosed by the utility model can effectively reduce measuring errors and more truly reflect the fluidity of the cement mortar.

The invention discloses a socket prefabricated chute and a prefabricating and assembling method, and belongs to the technical field of road drainage facilities. The torrent groove comprises a top section, a plurality of middle sections and a bottom section which are in lap joint with one another, and main bodies of all the sections are groove bodies of U-shaped structures, are in lap joint through U-shaped clamping grooves and U-shaped bosses and are connected through U-shaped connecting steel bars. The top section, the middle section and the bottom section are made of C25 concrete precast blocks, two-cloth-one-film anti-seepage geotechnical cloth is laid at the bottom, cement mortar is adopted for caulking at the splicing position, a slope toe foundation is arranged below the bottom section, and an anti-skid table is further arranged according to the filling height of a roadbed. The prefabrication method comprises the steps of formwork preparation, bolt hole forming part pre-burying, concrete pouring and demolding forming. The assembling method comprises the steps of foundation treatment, installation of all sections, steel bar connection, joint treatment, auxiliary treatment, anti-skid table arrangement and the like. The construction method has the advantages of being high in construction efficiency, easy to guarantee construction quality, good in anti-seepage performance, high in structural stability and the like, and is suitable for various road drainage projects.

The invention provides a cement mortar material repair coating and a preparation process thereof. The cement mortar material repair coating is prepared from the following raw materials in parts by weight: 4 to 6 parts of nano silicon dioxide composite liquid, 6 to 10 parts of bridging agent, 2 to 5 parts of rubber powder, 0.5 to 1.0 part of nano carbon fiber, 3 to 6 parts of modified polyacrylate, 0.8 to 1.2 parts of water reducing agent and 0.3 to 0.7 part of plasticizer. Through the synergistic effect of the nano silicon dioxide composite liquid, the bridging agent and the modified polyacrylate, a'rigid framework-flexible network-dynamic repair 'multilevel structure is formed, so that the performance of the repair agent exceeds that of a traditional repair material. When the thickness of the repaired surface of the cement mortar material repair coating is 10-20 mm, the repair strength requirement can be met, the repair time can be saved, and the repair material can be saved.

The present invention discloses a nano-calcium carbonate modified polyacrylate emulsion and a preparation method thereof. The emulsion is prepared from the following raw materials in parts by weight: 30-65 parts of an acrylate mixed monomer, 8-30 parts of a functional monomer, 0.1-1 parts of a modified nano-calcium carbonate emulsion, 1-5 parts of a composite emulsifier, 0.08-0.65 parts of an initiator, 2-4.5 parts of liquidambar resin, 0.02-0.2 parts of a chain transfer agent, 0.1-5 parts of a pH regulator, and 100-155 parts of deionized water. The nano-calcium carbonate modified polyacrylate emulsion can be used as a water-based coating, water-based ink, an environmentally friendly adhesive, textile printing and dyeing, leather finishing, building cement mortar, and as a functional material in other fields. The emulsion has the characteristics of fast film formation speed, good water resistance, strong adhesion, fast drying speed, simple process, wide applicability, and ease of industrial production.

The invention belongs to the technical field of concrete preparation, and particularly relates to a method for determining the proportion of dry and hard concrete doped with copper tailings. The method comprises the following specific steps: S1, determining a water-cement ratio according to the preparation strength of the hard concrete; s2, calculating the specific surface area of the sample; s3, calculating the average adhesive cement film thickness of the cement adhesive cement coated aggregate; and S4, calculating the use amount of the cement and the water. According to the method, the industrial waste copper tailings are subjected to resource utilization, the cement dosage is easy to control in the proportioning design process of the method, the efficiency is high, and the strength and stability of the dry and hard cement concrete doped with the copper tailings are guaranteed.

The utility model belongs to the field of cement fluidity detection, and discloses a cement mortar fluidity detection device which comprises a measuring disc, and a vibration mechanism is arranged at the bottom of the measuring disc; the inner side of the outer circular ring is matched with the measuring disc, an inner circular ring is fixed to the inner side of the outer circular ring, and the bottom surface of the inner circular ring abuts against the measuring disc; the measuring mechanism comprises a movable unit and a measuring scale, the movable unit is movably installed on the outer circular ring and located above the inner circular ring, and the measuring scale is installed on the movable unit. Through the arrangement of the outer circular ring and the inner circular ring, the outer circular ring, the inner circular ring and the measuring mechanism can be integrally placed on the measuring disc in a hanging and overlapping manner, so that when the measuring disc needs to be cleaned, loaded and unloaded, the outer circular ring and the like do not interfere with the work of a worker, and the worker can better control the measuring disc.