289 results about "Slump" patented technology

The invention relates to the technical field of building materials, and provides washing gangue concrete with high slump loss resistance and a mixing process thereof. The high-slump-retaining washed gangue concrete is prepared from the following raw materials in parts by weight: 200 to 220 parts of cement, 140 to 150 parts of mineral powder, 60 to 65 parts of fly ash, 680 to 720 parts of machine-made sand, 950 to 970 parts of washed gangue, 150 to 160 parts of water, 16 to 17.5 parts of a water reducing agent, 0.15 to 0.3 part of a slump retaining agent and 4 to 4.3 parts of polyethylene glycol. The slump retaining agent is hydroxypropyl methyl cellulose ether; and the viscosity of the hydroxypropyl methyl cellulose ether is 100 thousand mPa.s to 300 thousand mPa.s. According to the technical scheme, the problems of poor slump retaining performance and low compressive strength of washed gangue concrete in the prior art are solved.

The invention discloses an efficient filling method for an underground small goaf group, and the method comprises the steps: constructing a three-dimensional model through laser radar scanning, and marking a communication relation and the stability of a top plate; dividing the goaf group into a main filling area and a secondary filling area, and designing a fractal topological structure drainage channel to form a gravity flow network; preparing filling slurry taking a cementing material, tailings and the like as main materials, and controlling parameters such as slump, initial setting time and the like; then, stepped pressure self-adaptive filling is adopted, slurry is injected in two stages, and the pressure and the flow speed are controlled; according to the method, the problems that traditional filling blind areas are large in number, material waste is serious and efficiency is low are solved, low-pump-pressure global coverage is achieved, the roof contact rate is remarkably increased, safe and efficient mining of mines is guaranteed, the comprehensive cost is reduced, and the method is suitable for underground small goaf group filling.

The invention discloses a large-area concrete pouring vibrating and leveling device and a using method, and belongs to the field of concrete pouring construction. Comprising a walking and stabilizing system, accurate positioning is achieved through four-wheel independent driving, and a hydraulic supporting column and a sliding rail weight box cooperate to dynamically balance overturning moment; the multi-degree-of-freedom telescopic arm system drives an end effector to perform three-dimensional positioning through a multi-stage hydraulic telescopic sleeve and covers a large-area operation area; the intelligent vibrating-leveling execution system and the modularized vibrating system are adopted, eight groups of high-frequency vibrating rods are carried on a main / expansion plate, an ultrasonic sensor is embedded in a rod body protection cylinder to generate a compactness cloud picture in real time, and a hose is driven to integrate a strain sensor to invert the slump; the self-adaptive leveling system and the laser grid scanner construct a three-dimensional elevation model, and the hydraulic elevation regulator realizes + / -0.1 degree grade gradient control. According to the method, traditional layering limitation is broken through, efficiency is improved, porosity and flatness errors are reduced, and manual safety risks are thoroughly eliminated.

The invention discloses quick-hardening high-strength lightweight aggregate concrete, which is prepared from the following raw materials: ordinary Portland cement, quick-hardening sulphoaluminate cement, a mineral admixture, silica fume, ceramsite, river sand, water and an additive, and the additive is a mixture of a water reducing agent, a slump retaining agent, a retarder, a thickening agent and an air entraining agent; after the ceramsite absorbs water and is saturated, the surface of the ceramsite is coated with a cementing material, and the cementing material is hydrated to form a slurry shell; ordinary Portland cement and quick-hardening sulphoaluminate cement are compounded, mineral admixtures and silica fume are doped, the early strength of the lightweight aggregate concrete can be improved, meanwhile, the development of later strength is guaranteed, a layer of slurry'shell 'is formed on the surface of ceramsite through the hydration effect of the cementing material, and the surface of the ceramsite is wrapped by the composite cementing material. According to the ceramsite wrapped with the ash, firstly, the strength of the ceramsite can be improved, and then the strength of the concrete is improved; 2, the water absorption and water return phenomena of the ceramsite can be avoided; and thirdly, the floating phenomenon of the ceramsite can be improved.

The application belongs to the field of concrete production, and particularly relates to a preparation process for improving the performance of machine-made sand concrete, which comprises the following specific steps: S1: taking ether water-reducing agent, ether slump-retaining water-reducing agent, retarder, mud inhibitor and water in a proportion of 160:35:20:5:780 respectively, and compounding the above-mentioned materials to obtain a composite admixture; S2: taking 585 parts of machine-made sand and cleaning the machine-made sand by using a cleaning device, then drying the cleaned machine-made sand, and then mixing the treated machine-made sand with 200 parts of fine river sand, 25 parts of red mud and 1050 parts of stone for 30-50 seconds to obtain a mixture A; S3: taking 60 parts of fly ash, 60 parts of mineral mud and 240 parts of cement, and adding the mixture A to obtain a mixture B after stirring and mixing for 40-50 seconds; the composite admixture is obtained by compounding the above-mentioned materials in a proper proportion, and the machine-made sand concrete is prepared by using a proper proportion, so that the slump retention performance of the concrete is improved, and the final setting time of the concrete is not greatly affected.

The present invention allows for better control over strength in concrete mixes and mix designs, while minimizing the over-use of cement and promoting sustainability within the industry. Disclosed are novel method and system which employ a diagnostic delta data (DDD) curve, or, in other words, data that displays a curvilinear relationship when plotted on a visual graph, as obtained by considering the differences (e.g., subtractive differences or ratios) as between (i) target slump and target (or maximum) water content, and (ii) slump and water content values as determined using an automated slump monitoring system which measures slump and water content in the concrete mix during delivery. This DDD curve can then be compared to monitored delta slump and delta water content for later or other deliveries, such that adjustments can be made to the concrete mix or mix design, in a manner that encourages avoidance of cement over-dosing or over-prescription.

The invention discloses a tensile and anti-crack concrete pole, which belongs to the technical field of concrete materials and comprises the following components in proportion: 380-450 kg / m < 3 > of cement, 20-40 kg / m < 3 > of silica fume, 50-80 kg / m < 3 > of fly ash, 1000-1150 kg / m < 3 > of broken stone, 650-750 kg / m < 3 > of sand, 0.5-1.5 kg / m < 3 > of synthetic fiber, 30-80 kg / m < 3 > of steel fiber, 130-160 kg / m < 3 > of water, 25-40 kg / m < 3 > of expanding agent and 4.5-7.5 kg / m < 3 > of multi-branched temperature-sensitive polycarboxylic acid superplasticizer. The multi-branched temperature-sensitive polycarboxylic acid high-efficiency water reducing agent is prepared by co-polymerizing a multi-branched chain transfer agent, a temperature-sensitive polymerizable monomer, acrylic acid and polyethylene glycol monomethyl ether acrylate, and has the advantages of excellent dispersion effect, high-temperature slump retaining property, few pores of an electric pole, high compactness and better tensile and anti-cracking properties.

The invention discloses green cast-in-place high-strength lightweight foam concrete, and belongs to the technical field of new materials. The concrete is prepared from the following components in parts by weight: 30 to 50 parts of cement, 20 to 40 parts of light foam aggregate, 15 to 30 parts of fine aggregate, 15 to 25 parts of water, 0.1 to 1.0 part of foaming agent, 5 to 15 parts of mineral admixture and 0.1 to 2 parts of chemical admixture. The chemical additive contains a high-efficiency water reducing agent, a modified retarder and an air entraining agent in a weight ratio of (5-7): (2-3): (1-2). Through the innovatively designed modified retarder, nano-modified light foam aggregate and fine aggregate, and by optimizing the mix proportion and the preparation process, the mechanical properties (compressive strength of 20.5-24.5 MPa), durability (water absorption of 3.4-4.0%) and construction performance (slump of 162-175 mm) are remarkably improved. And the carbon footprint is reduced by utilizing industrial byproducts, so that green environmental protection and economy are realized. The method is suitable for cast-in-place high-strength light structures, has the advantages of light weight, high strength, durability and construction convenience, and provides a sustainable solution for modern engineering.

The invention discloses a red clay excavation side slope collapse emergency disposal and treatment construction method, and belongs to the technical field of geological disaster prevention and side slope engineering. According to the method, through six-step integrated construction of monitoring, closing, reinforcing, back pressing, structure and slope protection, rapid emergency rescue and long-acting treatment of red clay slope collapse are achieved. The method has the advantages of being rapid in construction, small in traffic influence, low in cost, lasting in treatment effect and the like, and is suitable for comprehensive treatment of red clay slope slump in projects such as highways and railways.

A coal-based solid waste regenerated aggregate shotcrete and a preparation method thereof, comprising cementitious material 100 parts, coarse aggregate 150-200 parts, fine aggregate 150-200 parts, polycarboxylate superplasticizer 2-4 parts, anti-adsorption agent 0.5-1.5 parts, water 35-60 parts, and defoaming agent 0.1-0.3 parts. The cementitious material is composed of cement and waste desulfurization gypsum; the coarse and fine aggregates are all coal gangue or gasification slag; the polycarboxylate superplasticizer is a slow-release polycarboxylate superplasticizer containing phosphate ester groups in the side chain; and the anti-adsorption agent is bentonite modified by a silane coupling agent. The modified bentonite anti-adsorption agent preferentially blocks the porous surface adsorption sites of the coal-based solid waste aggregate, and the slow-release polycarboxylate superplasticizer continuously provides dispersion force, effectively reduces the invalid consumption of the superplasticizer, significantly reduces the 1h slump loss rate of the concrete, reduces the rebound rate of the shotcrete construction to below 15%, and the total solid waste content is above 70%, realizing large-scale collaborative utilization of coal-based solid waste and waste desulfurization gypsum.

The invention provides a cemented filling method for high-concentration self-flowing slurry with multiple types of aggregate proportions, belongs to the technical field of mine filling, solves the problem of unreasonable gradation of filling materials, and comprises the following steps: sampling and measuring the specific gravity, volume weight and grain gradation of aggregates; establishing a relevance trend of mass concentration and cube compressive strength, slump and self-flow conveying; carrying out an orthogonal matching test and screening key parameters through range variance analysis; establishing a multi-objective optimization model based on the rheological model and nonlinear programming to solve an optimal ratio; the transportability of the slurry is verified through a rheological test; measuring initial setting and final setting time of the slurry; analyzing the influence of the stirring time and the stirring area on the homogeneity and the mechanical property of the slurry; selecting slurry parameters according to a filling multiple line; pipeline arrangement is determined according to the filling system capacity. Accurate aggregate proportioning can be achieved, the strength uniformity of a filling body is improved, cement consumption and pipeline abrasion are reduced, and technical support is provided for transformation of a high-concentration self-flowing cemented filling system in a mining area.

The utility model discloses a civil engineering building detection device, which relates to the technical field of civil engineering construction slump detection, and adopts the technical scheme that the civil engineering building detection device comprises a bottom plate, a support plate arranged above the bottom plate and used for placing a plurality of slump barrels, and a lifting plate arranged above the support plate, sliding grooves are formed in the vertical plates, and sliding blocks matched with the sliding grooves in a sliding mode are arranged at the two ends of the lifting plate. Compared with the prior art, the concrete quality detection system has the beneficial effects that the detection efficiency and accuracy are effectively improved through an automatic and multi-measuring-point detection technology, the intervention of manual operation is reduced, and more reliable technical support is provided for concrete quality control.

The invention relates to a detection device for accurately measuring concrete slump, and belongs to the field of concrete slump detection. The device comprises a base, a bottom plate and a slump cylinder; the bottom plate is detachably arranged above the base; a telescopic unit is rotationally arranged on the base; a plurality of pieces of wiping cloth are uniformly arranged on the peripheral side of the telescopic unit; the multiple pieces of wiping cloth abut against the inner wall of the slump cylinder. A water supply unit is arranged on the base; the water supply unit is used for wetting a plurality of dry cloths; a plurality of drying plates are arranged on the top wall of the base; the multiple drying plates are evenly distributed in the circumferential direction of the telescopic unit. After the telescopic unit moves downwards, the multiple pieces of wiping cloth abut against the plate faces of the multiple drying plates; the device has the technical effects that the wiping efficiency of the upper water of the slump cylinder is improved, and the detection precision is improved.

According to the high-performance concrete and the preparation method thereof, machine-made sand, steel fibers and PVA fibers are modified, the machine-made sand is activated through water vapor, micro-cracks in the surface of the machine-made sand are opened, PVA-g-SiO2 is sprayed on the machine-made sand through high-speed airflow to form an anchor structure, and the anchor structure can improve the binding force with the PVA fibers and the steel fibers, so that the strength of the machine-made sand is improved; the bonding force of fine aggregate to fibers is improved, the fibers are protected, PVA fibers are modified through silane, the stress defect caused by damage of the PVA fibers in concrete is avoided, the slump of the concrete can be improved through the modified PVA fibers, the dispersion index of the fibers can be increased, the initial crack strength of the concrete can be improved, and the strength of the concrete can be improved through passivation rust-proof treatment on the steel fibers. The durability of the concrete is enhanced; the compressive strength of the concrete is improved; the diffusion coefficient of chloride ions of the concrete is reduced; the weather resistance is improved.

The application relates to the field of concrete mixing ratio experiments, in particular to a mixing ratio experiment device and method for ultra-high performance concrete, which comprises a round mold, a feeding cylinder, a limiting assembly, a baffle, a driving assembly, a mounting plate, a knocking hammer, a knocking assembly and a bottom plate. The limiting assembly is used for quickly locking the feeding cylinder and the round mold through cooperation of a pull rod, a spring, a rotating disc, a driving groove, a driving rod and a limiting block; the driving assembly is used for driving the baffle to be synchronously opened and closed through transmission of a knob, a first rotating rod, a cone wheel set and a threaded rod, so that mechanical scraping is realized; and the knocking assembly is used for realizing alternate knocking of the round mold through linkage of a rotating handle, a third rotating rod, a push block, a connecting rod and the knocking hammer. The application has the advantages of convenient assembly and disassembly, reliable sealing, accurate scraping, high efficiency and the like, effectively eliminates bubble interference and human errors, and improves the accuracy, reliability and operation efficiency of the slump experiment of the ultra-high performance concrete.

The invention discloses self-compacting concrete and a preparation method thereof, and relates to the technical field of concrete, and the concrete comprises cement, fly ash, mineral powder, water, sand, stone and a modified water reducer. The modified water reducing agent is a polymer prepared from a hydroxyl-containing monomer I, a double-bond-containing acyl chloride monomer II, an unsaturated polyether monomer III and a double-bond-containing monomer IV in a mass ratio of (0.5-1.5): 1: (9-12): 1 through esterification reaction and double-bond addition polymerization, and hydroxyl, carboxyl and a polyether side chain are introduced into a molecular chain of the polymer at the same time. According to the water reducer, through the synergistic effect of hydrogen bond stable adsorption, steric hindrance and electrostatic repulsion, the compressive strength of concrete is improved, the slump is reduced, the balance of super-long retarding and high-strength development is achieved, and the comprehensive performance is excellent.

The invention belongs to the field of overflow fine sand detection, and particularly relates to overflow fine sand filling slurry expansion degree test equipment. The invention discloses overflow fine sand filling slurry expansion degree test equipment which can improve the detection accuracy, the operation convenience and the test efficiency. The overflow fine sand filling slurry expansion degree test equipment comprises a supporting plate, a transverse electric track, a vertical mounting plate, a vertical electric track, a lifting plate and the like, transverse electric rails are symmetrically arranged on the top of the supporting plate, a vertical mounting plate is connected between sliding blocks of the transverse electric rails, and vertical electric rails are arranged on the front side of the vertical mounting plate in a bilateral symmetry mode. Through the transverse electric track and the vertical electric track, the position of the slump cylinder can be accurately adjusted, the axis of the slump cylinder can be accurately aligned with the circle center of a circular ring, the test accuracy is guaranteed, and meanwhile operation is facilitated; the amount of the test slurry can be rapidly changed through the discharging device, multiple tests can be conveniently carried out, and the practicability of the equipment is improved.

The invention provides super-retarded concrete and a preparation method thereof. The super-retarded concrete is prepared from the following raw materials in parts by weight: 250 to 350 parts of cement, 80 to 120 parts of fly ash, 60 to 100 parts of superfine slag powder, 600 to 800 parts of sand, 1000 to 1200 parts of stone, 150 to 200 parts of water, 3 to 5 parts of a high-efficiency water reducing agent, 8 to 12 parts of a composite retarder, 5 to 7 parts of an expanding agent and 32 to 45 parts of an anti-cracking agent, wherein the composite retarder is prepared from sodium gluconate, citric acid and sodium lignin sulfonate, and the mass ratio of the sodium gluconate to the citric acid to the sodium lignin sulfonate is (2.5 to 3.5) to (1.5 to 2.5) to (0.5 to 1.5). According to the super-retarding concrete, the setting time of the concrete can be remarkably prolonged, and the problems of long-time pouring of a building structure, 'cold joint 'in mass concrete construction, slump loss in summer construction and the like are well solved; meanwhile, the super-retarded concrete provided by the invention can reduce hydration heat and improve crack resistance, and can well meet the construction requirements of mass concrete.

The invention discloses a cement stabilized macadam test piece and a preparation method thereof, and belongs to the technical field of traffic civil engineering. The test piece is prepared from the following components in parts by mass: 85 to 92 parts of graded aggregate, 6 to 12 parts of composite cementing material and 0.3 to 0.8 part of special admixture; the graded aggregate is of a skeleton-transition-filling three-stage structure, and the filling aggregate contains surface modified silicon carbide microbeads; and the special additive contains a slump-retaining polycarboxylic acid water reducing agent and a hydroxypropyl methyl cellulose-xanthan gum composite adhesive. The components of the test piece have a synergistic effect, and through multi-dimensional synergy of aggregate grading, modified filler and admixture regulation and control, the problems of large-particle-size broken stone sinking, uneven aggregate distribution and segregation, insufficient compactness and the like in the forming process of the cement stabilized broken stone test piece are effectively solved; the compactness, the mechanical strength and the durability of the cement stabilized macadam test piece containing the large-particle-size macadam are remarkably improved, and the composition materials of the cement stabilized macadam test piece can be used for base layer construction of high-grade highways and municipal main roads and meet the heavy-load traffic requirement.

The invention provides a hyperbranched polycarboxylic acid water reducing agent as well as a preparation method and application thereof, and belongs to the field of synthesis of water reducing agents. When the hyperbranched polycarboxylate superplasticizer prepared by the preparation method provided by the invention is added into cement paste, the fluidity of the cement paste can reach 320mm; when the hyperbranched polycarboxylate superplasticizer is added into mortar, the water-reducing rate can reach 28.9%; when 0.5-1.5% of the hyperbranched polycarboxylate superplasticizer is added into experimental concrete, the slump is 200mm, the expansion degree is 387.5 mm, the compressive strength in 28 days can reach 27.4 MPa, the compressive strength is improved by 34% compared with the compressive strength of the concrete without the hyperbranched polycarboxylate superplasticizer, and the hyperbranched polycarboxylate superplasticizer has good dispersing performance and water-reducing rate for cement-based materials.

1. Name of the product in this design: Tamping rod for slump test of concrete mixture. 2. Purpose of this design: For use in slump testing of concrete mixtures. 3. The key design elements of this product are the combination of shape, pattern, and color. 4. The image or photograph that best illustrates the design's key points: a 3D model. 5. The front view and rear view of this design are the same, so the rear view is omitted; the left view and right view of this design are the same, so the right view is omitted; the bottom surface of this design is a part that is not easily seen or cannot be seen during use, so the bottom view is omitted. 6. The design for which protection is sought includes color.

The invention discloses a structure for treating swelling soil slope collapse and a construction method. The north leading dry weak expansive soil side slope is obviously damaged under the synergistic effect of freezing and thawing and water environments, the strength is reduced along with the increase of the freezing and thawing cycle times, the frost heaving deformation is large under partial working conditions, cracks are generated under the condition of large difference between the deformation and the strength, and the bank collapse phenomenon occurs. The structure comprises an original slope, PET bag reinforcing feet are arranged on the lower portion of a slope body of the original slope, the slope toe of the original slope is covered with a bidirectional geogrid, an anti-sliding key is nailed on the geogrid, the geogrid is covered with a covering layer, and the upper portion of the anti-sliding key is covered with the covering layer; the method is used for treating swelling soil slope collapse.

The invention discloses a concrete detector, and relates to the technical field of concrete.The concrete detector comprises a bottom plate, vertical plates are fixedly installed at the positions, close to the two sides, of the top of the bottom plate, two collapse half barrels are arranged between the two vertical plates, a moving structure is arranged on one sides of the two vertical plates, and the moving structure comprises four moving wheels; sliding grooves II are formed in one sides of the two vertical plates in a front-back symmetrical penetrating mode and penetrate through the other sides of the two vertical plates, the four moving wheels are installed in the four sliding grooves II correspondingly, connecting blocks are fixedly installed on the cambered surfaces, away from each other, of the two collapsing half barrels correspondingly, first tooth grooves are formed in one sides of the moving wheels in a penetrating mode and penetrate through the other sides of the moving wheels correspondingly, and the two connecting blocks are rotationally connected with connecting shafts correspondingly; second tooth grooves are formed in the positions, close to the two ends, of the outer surface of the connecting shaft, the two ends of the connecting shaft penetrate through the second sliding grooves in the two sides correspondingly, and a pair of third sliding grooves are formed in the sides, away from each other, of the two vertical plates in a front-back symmetry mode. According to the concrete slump detection device, by arranging the moving structure, the effect that concrete slump detection is more rapid and convenient is achieved.

The present application relates to the technical field of concrete, in particular to a high-performance concrete mixture for power plants and a construction method thereof. The interface-hydration synergistic regulation technology is adopted, in which cementitious materials, water, river sand and continuously graded gravel are used as the matrix, and poly-carboxylic acid water reducing agent, crystal nucleus slurry A / B and zwitterionic-hydrophobic copolymer brush modified silica particle B are alternately added in stages to pre-coat and synchronously disperse the coarse aggregate, so that the concrete with long-time slump retention, low bleeding, high early and long-term strength, significantly reduced electric flux and chloride ion permeability, improved sulfate erosion resistance and volume stability is obtained under the conventional mixing and pumping conditions. The in-mold temperature, layered pouring thickness, vibration frequency and curing time limit are specified to ensure the engineering implementability and durability, and the concrete is suitable for power plant structures in high-temperature, high-humidity and chlorine-containing environments, and the construction is reliable and the maintenance is convenient.

The utility model discloses a charging tool for concrete slump detection. The charging tool comprises a charging assembly, an anti-overflow assembly and a handle, the charging assembly comprises a bottom plate and a left baffle, a right baffle and a rear baffle which are integrally formed with the bottom plate, the left baffle is parallel to the right baffle, the rear baffle is perpendicularly connected with the left baffle and the right baffle to jointly define a U-shaped containing cavity, and the outer side of the rear baffle is fixedly connected with one end of the handle; the spill-proof assembly comprises an inclined plate, a left inclined baffle and a right inclined baffle, the left inclined baffle and the right inclined baffle are perpendicularly arranged on the two sides of the inclined plate, the length of the inclined plate is matched with that of the bottom plate, and the spill-proof assembly is fixedly connected with the opening end of the loading assembly to form an integrated shovel body structure. And the volume design of the shovel body structure meets the condition that the material shoveling 3, the material shoveling 2 and the material shoveling 1 respectively correspond to the standard filling amounts of the first layer, the second layer and the third layer of the slump detection cylinder. The tool with the fixed width and volume is used for charging, and the problems of concrete overflow and personal errors during charging are effectively solved.

The utility model belongs to the technical field of slump detectors, and particularly relates to a concrete slump detector which comprises a base, four uniformly distributed rollers are arranged at the lower end of the base, a handrail is fixedly connected to the rear side of the upper end of the base, and a water absorption plate is slidably connected to the inner wall of the base. The upper end of the water absorption plate is in contact with a slump cylinder, a first fixing plate is fixedly connected to the left side of the upper end of the base, an initial pressing plate is slidably connected to the inner wall of the first fixing plate, and the initial pressing plate is in contact with the slump cylinder. According to the concrete slump measuring device, through the arrangement of the motor, the screw rod and other structures, the movable measuring plate can be driven to move, under the clamping hole, the clamping ball and other structures, the movable measuring plate can be movably positioned and used, then height positioning is conducted on slump concrete with a slump cylinder removed, and the slump of the concrete can be measured and used in cooperation with the effect of the initial pressing plate.

A concrete material performance testing device comprises a support structure and a deformation limiting cylinder. The support structure includes a support base driven by a drive motor to rotate and equipped with a horizontal testing platform on its top surface. The deformation limiting cylinder is mounted on the testing platform, with a fixed ring at the top. The cylinder body is composed of a circular array of arc plates, with the top of the arc plates hinged to the fixed ring and the bottom supported on the testing platform by extrusion rollers. A limiting device restricts the radial displacement length of the arc plates under centrifugal force, allowing the deformation limiting cylinder to switch between a cylindrical and a frustum shape. The cylinder is lined with a sealing membrane to form a sealed inner cylinder with openings at the top and bottom. This device utilizes centrifugal force to automatically collapse the concrete and expel air, significantly improving the density of the specimen, reducing air bubbles and porosity, greatly improving the efficiency of concrete slump testing, and effectively reducing labor requirements.

A quality control system of the invention allows controlling, image analysis and continuous visual monitoring of aggregates and sand processing, and physical properties and workability of fresh concrete and concrete mixes, which are manufactured from the aggregates and sand, and then transported to construction sites and used there for construction purposes. The system of the invention comprises visual monitoring devices (100), stationary or mobile, installed or remotely used at quarries, concrete plants, in concrete trucks and at the construction sites. The method for continuous visual monitoring of the aggregates, sand and concrete is based on image or video processing and analysis of the aggregates and sand, fresh concrete, concrete mixes or precast concrete, the concrete slump levels, segregation and bleeding, homogeneity of the mixture and consistency.

This invention relates to the field of concrete, and more particularly to a novel flocculant specifically for washed sand and its preparation and application methods. The flocculant is prepared via free radical polymerization using unsaturated acids, amide monomers, polyether macromonomers, and asymmetric crosslinking agents as reactants. Based on its pH-responsive characteristics, this flocculant can intelligently switch between flocculant and water-reducing agent: during sand washing, it efficiently flocculates mud and fine powder in wastewater, promoting wastewater recycling; when it remains in manufactured sand and enters the alkaline environment of concrete, the ester bonds in the molecule can hydrolyze and break, degrading the flocculant into polycarboxylic acid fragments with a comb-like structure. This novel flocculant not only eliminates the problems of high water-reducing agent dosage and large slump loss caused by traditional flocculant residues, but the degradation products themselves can also play a dispersing role, helping to reduce the water-reducing agent dosage and improve the slump retention performance of concrete.

The invention discloses a multi-element solid-waste-based ecological mining area filling material and a preparation method thereof.The preparation method of the multi-element solid-waste-based ecological mining area filling material comprises the steps that a first system and a second system are mixed to be uniform, slurry is obtained, pouring and standing are conducted till final setting, maintenance is conducted, and the multi-element solid-waste-based ecological mining area filling material is obtained; the first system comprises a foaming agent and first water; the second system comprises a cementing material, second water and a water reducing agent. The multi-element solid waste-based ecological mining area filling material provided by the invention takes the fly ash as a main raw material and is low in cost, the slump expansion degree of the multi-element solid waste-based ecological mining area filling material is up to 272 mm, the uniaxial compressive strength is up to 5.928 MPa, and meanwhile, the multi-element solid waste-based ecological mining area filling material has relatively low plastic viscosity and yield stress.