389 results about "Water–cement ratio" patented technology

The invention provides a slag ardealite-based solid waste cementing material as well as a preparation method and application thereof, and belongs to the technical field of building materials. The slag ardealite-based solid waste cementing material is prepared from the following raw materials in percentage by mass: 45-55% of slag, 40-50% of ardealite, 0.5-5% of carbide slag and 2-10% of silica fume, the water-cement ratio is 0.35-0.50, the slag, the ardealite, the carbide slag and the silica fume are uniformly mixed, then water is added, stirring is performed to obtain slurry, and the slurry is uniformly mixed to obtain the slag ardealite-based solid waste cementing material. Pouring into a mold, standing, demolding, and carrying out standard curing to obtain the slag ardealite-based solid waste cementing material. According to the invention, two calcium-containing solid wastes of slag and ardealite are used as main raw materials, carbide slag is used as an alkaline activator, silica fume is added to further improve the performance of the solid waste cementing material, the cement has the characteristics of low carbon, low cost, high performance and the like, and environmental and ecological problems caused by accumulation of a large amount of solid waste materials are reduced at the same time.

The invention discloses a high-performance concrete material adapted to an assembled pavement and a preparation method thereof, and the concrete per unit volume is prepared from the following components in parts by weight: 100-220 parts of cement, 200-440 parts of fly ash, 10-30 parts of silica fume, 20-60 parts of glass beads, 10-30 parts of rubber powder, 100-200 parts of fine aggregate, 7-16 parts of a water reducing agent, 8-15 parts of a thickening agent and 0-6 parts of PVA fiber. And 1-8 parts of magnesium chloride hexahydrate, wherein the water cement ratio is 0.2-0.4. And carbonizing and curing the fiber reinforced concrete slurry to obtain the high-performance concrete material. The fiber reinforced concrete is subjected to carbonization curing to generate natural aragonite fibers, the toughness of the concrete is improved, and concrete with different aragonite contents can be prepared by adjusting the content of the magnesium chloride hexahydrate reagent, so that different toughness is achieved. According to the present invention, the fabricated pavement with characteristics of small thickness, toughness and strength meeting mechanical requirements of different working conditions during transportation, hoisting and service can be prepared, green maintenance and rapid maintenance can be achieved, and rapid development and large-scale application of the fabricated pavement can be promoted.

The invention relates to the technical field of concrete slump detection, in particular to a concrete slump online monitoring method based on data analysis. The method comprises the following steps: S1, collecting temperature, humidity, rotating speed, torque, stirring time, water cement ratio, additive dosage and reaction rate data of concrete in a stirrer in real time; s2, calculating concrete slump by using a dynamic physical property slump estimation algorithm; s3, calculating the concrete slump by using a chemical reaction dynamic slump prediction algorithm; s4, comparing a preset threshold value with a difference value between the two slumps; and S5, measuring the shear stress and shear rate curve of the concrete, and predicting the slump by using the rheological model. According to the concrete slump online monitoring method based on data analysis, accurate monitoring and real-time control of the concrete slump are realized through mutual verification of a dynamic physical property slump estimation algorithm and a chemical reaction dynamic slump prediction algorithm.

The invention relates to the technical field of intelligent manufacturing, and particularly provides an intelligent ultra-high performance concrete preparation system and a control system thereof.The preparation system comprises an environment adaptability adjusting subsystem used for automatically adjusting preparation operation parameters of equipment according to external environment temperature and humidity changes of an ultra-high performance concrete mixture; the dynamic optimization proportioning subsystem is used for sensing real-time states of viscosity, fluidity and the like of the ultra-high performance concrete mixture in the preparation process through a built-in sensor array; adjusting a water-cement ratio and an aggregate proportion according to real-time states of preparation operation parameters, viscosity, fluidity and the like; and the operation energy efficiency management subsystem is used for adjusting the working mode of the equipment according to the preparation operation parameters. The control system comprises an equipment layout assembly, an equipment communication assembly and a program execution assembly. While the quality of the ultra-high performance concrete is ensured, the preparation efficiency and the environmental adaptability are improved, the energy consumption is reduced, and green and intelligent production of the ultra-high performance concrete is realized.

Apparatus for real time water content and water cement monitoring on a ready-mix concrete truck includes at least one real time moisture measurement module or sensor configured tosense continuous real time moisture measurements of a batch of wet cement loaded into a rotating drum of a ready-mix concrete truck; andprovide signaling containing information about the continuous real time moisture measurements sensed.The apparatus may include either a hatch door of the rotating drum of the ready-mix concrete truck, or the rotating drum of the ready-mix concrete truck, or the ready-mix concrete truck itself.

The invention discloses a composite gel-physical foaming synergetic carbon dioxide foam concrete preparation technology, and the carbon dioxide foam concrete is composed of the following components in parts by mass: 15-45 parts of sulphoaluminate cement, 10-50 parts of semi-hydrated gypsum, 5-15 parts of Portland cement, 0-30 parts of mineral powder, 0-0.3 part of a gypsum retarder, 0.2-0.4 part of a retarder, and 0.2-0.4 part of a water reducing agent. The invention relates to a cement mortar which is prepared from the following components in parts by weight: 0.2-0.6 part of calcium stearate, 0.1-0.3 part of hydroxypropyl methyl cellulose ether (HPMC), 0.2-0.45 part of water cement and 5-15 parts of prefabricated foam. When the sulphoaluminate cement, the Portland cement and the semi-hydrated gypsum are mixed according to a specific mass ratio to prepare the carbon dioxide foam concrete, the hydration synergistic effect among the sulphoaluminate cement, the Portland cement and the semi-hydrated gypsum can be exerted, so that the mechanical property of the carbon dioxide foam concrete can be greatly improved.

The invention provides a grouting geology grading and construction parameter setting method based on rock mass permeability, and relates to the technical field of foundation engineering grouting construction.The method comprises the steps that the water permeability rate, fracture parameters (the number of independent unfilled fractures, the opening degree and the filling condition), ground stress and grout rheology data of a target hole section are obtained; calculating a grouted stratum grouting index (SGI) through the water permeability rate, the fracture number, the maximum equivalent fracture opening degree and the correction coefficient; the rock splitting strength is estimated in combination with the drilling condition; whether grouting is conducted or not is judged based on the SGI value, and the grouting starting water cement ratio, the grout changing strategy, the initial pressure and the pressure increasing strategy are dynamically adjusted; the grouting pressure is designed according to the stratum splitting strength, and the grouting termination condition is set in combination with the real-time flow-pressure data. Grouting parameters are optimized through quantitative grading and real-time data, experience dependence is reduced, the construction precision and efficiency are improved, the stratum adaptability is enhanced, and the engineering quality and the material utilization rate are ensured.

The invention discloses a high-performance double-slurry quick-setting grouting material and a preparation method thereof, and belongs to the field of building materials, the high-performance double-slurry quick-setting grouting material comprises a component A and a component B. The component A is base slurry, and the component B is a performance regulator of the component A; the component A is prepared from the following components in parts by weight: 30 to 35 parts of methacrylic anhydride gelatin modified sulphoaluminate cement, 5 to 8 parts of calcium powder, 0.25 to 0.45 part of lanthanum cerium oxide, 0.5 to 0.8 part of amino acid type surface activity exciting agent, 1 to 1.5 parts of polycarboxylic acid water reducing agent and water, and the water-cement ratio of the water to the modified sulphoaluminate cement is 0.35 to 0.45; and the component B is prepared from the following components: hydroxyethyl cellulose acrylamide modified bentonite, N-vinyl pyrrolidone / methacrylic acid / 2-hydroxy-3-methacryloyloxypropyl trimethyl ammonium chloride terpolymer, a double initiator, a cross-linking agent and deionized water. The bonding strength of the whole system of the grouting material can be enhanced, and the mechanical strength of the grouting material can also be improved.

The invention provides a slag filling material and application thereof, and belongs to the technical field of slag filling materials. The slag filling material provided by the invention comprises the following raw materials: tailings, slag, water and an alkali activator, the alkali activator comprises sodium carbonate and calcium hydroxide or carbide slag. According to the invention, sodium carbonate and calcium hydroxide or carbide slag are used as the composite alkali activator, on one hand, the calcium hydroxide or carbide slag is added to reduce the concentration of slag and tailings, and water is consumed in the reaction process, so that the water-cement ratio of the filling material is reduced, and the mechanical properties of the filling material are improved; on the other hand, the concentration of calcium ions in a reaction system is increased by adding the calcium hydroxide or the carbide slag, so that the Ca / Si ratio of the hydrated calcium silicate gel is increased, the mechanical property of the filling material is improved, meanwhile, the porosity of the filling material is reduced by calcium carbonate formed by the reaction, and the mechanical property of the filling material is further improved.

The invention provides a self-compacting ardealite road base material and a preparation method thereof, and belongs to the technical field of building materials, the base material comprises the following components in percentage by mass: 40-55% of ardealite, 4-13% of a cementing material, 35-50% of aggregate, 0.2-0.7% of an additive and the balance of water, wherein the cementing material comprises cement and slag powder, and the water-cement ratio is 4.5-7.5. According to the self-compacting phosphogypsum road base material, the properties of phosphogypsum and a cementing material are fully exerted, the filling slump expansion index of the formed self-compacting phosphogypsum road base material reaches SF1 level (550-655 mm), the expansion time T500 index reaches VS1 level (larger than or equal to 2 s), the 28-day compressive strength is larger than or equal to 8 MPa, the water softening coefficient is larger than or equal to 85%, and the water absorption rate is smaller than or equal to 10%. According to the phosphogypsum road base material disclosed by the invention, cement with a relatively low mixing amount is used, so that early-stage diseases of a road base are effectively overcome or avoided; and meanwhile, the ardealite with medium and high doping amount is used, so that the ardealite can be quickly consumed, the inventory is reduced, the stacking problem is relieved, and remarkable environmental, economic and social benefits are achieved.

The invention discloses a method for improving the fire extinguishing efficiency of an underground filling grouting material, and belongs to the technical field of mine fire prevention and control. The method comprises the following steps: mixing water and pulping raw materials according to a required water-cement ratio to prepare slurry; a chemical foaming agent component A is added into the slurry and fully mixed, then a chemical foaming agent component B is added, the chemical foaming agent component A contains carbonate, the chemical foaming agent component B contains acid, inert gas carbon dioxide is released after the component A and the component B are mixed, and slurry colloid foam is generated; injecting into a coal mine underground goaf through a grouting pipeline to extinguish fire and prevent fire; wherein the addition amount of the chemical foaming agent component A and the chemical foaming agent component B accounts for 5-18% of the weight of the slurry. A chemical foaming mode is adopted, a gas source is provided by means of carbon dioxide generated by chemical reaction of materials, the problem that traditional three-phase foam is insufficient in physical compressed air foaming capacity in long-distance high-position drilling is effectively solved, and the problem of continuous goaf oxygen supply under the condition of physical compressed air foaming is also effectively avoided.

The invention discloses a sulfate and chloride ion erosion resistant offshore wind power tower high-strength grouting material and a preparation method thereof. The grouting material comprises Portland cement, fine aggregate, ricinoleic acid modified nano zinc oxide, an anion erosion resistant agent, an expansion component, composite fibers and an additive. Wherein the anti-anion erosion agent comprises mineral powder, barium salt, lithium silicate, a calcium formate early strength agent and silica fume; the preparation method comprises the following steps: firstly, mixing and stirring the cement, the expansion component and the fine aggregate to obtain powder A; mixing and stirring ricinoleic acid modified nano zinc oxide, an anti-anion erosion agent and an additive to obtain powder B; mixing and stirring the powder A and the powder B, adjusting the water-cement ratio, adding the composite fiber, and stirring. The grouting material is good in fluidity, high in strength and excellent in fatigue resistance, can effectively prevent permeation of sulfate and chloride ions, and has high durability.

The invention relates to the technical field of roadbed fillers, and particularly discloses a high-fill roadbed filler based on weathered granite and a preparation method of the high-fill roadbed filler. The invention relates to a high-fill roadbed filler based on weathered granite. The filler comprises the following raw material components in parts by weight: 60-80 parts of granite waste slag, 10-20 parts of a binder and 5-15 parts of a waterproof agent, the waterproof agent comprises the following raw materials: cement, a silane modified filler, a waterproof reinforcing agent and water. A preparation method of a high-fill subgrade filler based on weathered granite comprises the following steps: firstly, crushing granite waste slag to obtain granite particles with the particle size of 30-50mm, then adding a binder, a waterproof agent and other raw materials into the granite particles, uniformly stirring and mixing to obtain a mixture, finally adding water, controlling the water-cement ratio to be 0.4-0.6, and uniformly mixing to obtain the high-fill subgrade filler based on weathered granite. Stirring and dispersing to obtain the high-fill roadbed filler.

The invention relates to a proportion optimization method for a cement stabilized macadam base of recycled aggregate. Taking an interface failure sensitivity coefficient IFSI as a quantitative index; the method comprises the following steps: performing microstructure reconstruction on recycled aggregate particles through SEM scanning, resistivity testing and CT scanning, extracting two indexes of defect density and surface adsorption strength, and constructing a degradation prediction model ITZ; the ITZ result is used as a basic parameter for adjusting the water cement ratio and the fine aggregate content, so that a mechanism from aggregate defects to interface failure is connected; establishing unit volume interface energy consumption minimization as an optimization target based on an IFSI value output by the interface failure model; the influence of the water cement ratio, the grading difference and the fine particle wrapping degree on the interface bonding energy consumption is analyzed, and a matching point under the specific recycled aggregate condition is found out through a multivariable function coupling model.

A method of cementing a geothermal wellbore includes pumping a first volume of cement slurry down a wellbore. The first volume of cement slurry has a first water to cement ratio. A second volume of cement slurry is pumped down the wellbore. The second volume of cement slurry has a second water to cement ratio that is less than the first water to cement ratio. The first volume of cement slurry hardens at a vertical portion of the wellbore, and the second volume of cement slurry hardens at a horizontal portion of the wellbore.

The invention discloses a recycled concrete precast pile mix proportion improvement method considering acid salt erosion influence, which comprises the following steps: firstly, determining an initial replacement rate and a water cement ratio of a building solid waste recycled concrete precast pile, and then establishing a mechanical property estimation model and a durability estimation model; judging whether the concrete mechanical property and durability of the precast pile meet the design standard or not under the condition of acid salt erosion; if so, completing the mix proportion improvement; if not, the concrete mix proportion is adjusted, and the mechanical property and the durability are evaluated again according to the pre-estimation model until the optimal mix proportion meeting the design requirement is found. The design of the building solid waste recycled concrete precast pile is optimized, and scientific basis and technical support are provided for practical engineering application. The problem that in the prior art, research on building solid waste recycled aggregate in soft soil foundation treatment application is insufficient is solved.

The invention belongs to the technical field of roadbed construction methods, and particularly relates to a cement improved tailing roadbed construction method. The method comprises the following steps: S1, determining the water content and particle composition of the tailings; s2, calculating the average particle size of the tailings in each grade of particle size range; s3, calculating the thickness of a water film on the surface of the centrifuged tailings; s4, determining the cement dosage and the water-cement ratio in the cement-improved tailing roadbed material according to experience, and determining the water content control value of the cement-improved tailing roadbed material in the construction process; and S5, the tailings are evenly arranged on the roadbed, the water content of the tailings reaches the water content control value + / -1%, then cement is evenly spread, the cement and the tailings are mixed, leveling is conducted through a land leveler, and finally rolling forming is conducted through a heavy road roller. According to the method, when the use amount of the tailing raw material, the cement and the like changes, the field construction water content control value is calculated in real time, it is ensured that the performance of the cement-improved tailing roadbed material is optimal, and the engineering quality is improved.

This application discloses a design method and grouting material for deep coal-bearing strata, comprising the following steps: S1 Data acquisition based on material pre-tests, correlation analysis, and orthogonal experiments; S2 Data expansion based on orthogonal experimental data to establish a dataset; S3 Creating a prediction model based on the RBF algorithm; S4 Optimizing the prediction model based on the PSO-RBF algorithm; S5 Proportion design based on the RBF-PSO-EWM algorithm; S6 Obtaining the proportion of grouting material for deep coal-bearing strata. This application proposes a PSO-RBF-EWM multi-objective optimization grouting material proportion design method and applies this method to design the comprehensive optimal proportion of grouting material for deep coal-bearing strata. The grouting material with the obtained optimal proportion has excellent characteristics such as low water-cement ratio, green environmental protection, and economic efficiency, and is suitable for the reinforcement characteristics of deep coal-bearing strata.

The invention relates to the technical field of intelligent grouting, in particular to an intelligent grouting method based on real-time permeability monitoring, which comprises the following steps: arranging a pressure monitoring array in a to-be-grouted area, and electrically connecting the pressure monitoring array with a controller; grouting is started, and the time when the grout reaches all the measuring points is obtained; the stratum permeability change condition is calculated; and dynamically adjusting grouting parameters according to the permeability change condition, wherein the grouting parameters comprise grouting pressure, a water-cement ratio and a cement particle size. According to the method, the grouting target is achieved most efficiently, most economically and most safely through the most appropriate grout, and the problems that in a traditional grouting technology, grouting is not uniform, the reinforcing effect is poor, and potential safety hazards are large are solved. And the grouting parameters are dynamically adjusted based on the change of the permeability, it is ensured that proper grout is injected, the construction quality and efficiency are improved, and intelligent development of the grouting technology is further promoted.

The invention belongs to the technical field of grouting materials, and particularly relates to a quick-setting early-strength self-stress functional grouting material and an expansibility testing method. The existing cement-based anchoring agent or mine filling body top-contacting agent and fractured rock mass grouting reinforcing agent have the phenomena of poor coupling effect, volume shrinkage and the like. The grouting material is composed of a component A and a component B, the component A mainly comprises sulphoaluminate cement, a water reducing agent, a retarder, a sodium salt accelerator and fibers, and the component B mainly comprises anhydrite, quicklime, a water reducing agent, an early strength agent, aluminum powder, a retarder and fibers. When in use, the mass ratio of the main components of the component A to the component B is (0.85-1.15): 1, and the water-cement ratio is (0.6-1.2): 1. When the water cement ratio is low (0.6-0.8: 1), the material can be used as an anchoring agent of an anchor rod; when the water-cement ratio is high (0.8-1.2): 1, the grouting agent can be used as a mine filling body top-contacting agent and a fractured rock mass grouting reinforcing agent; the invention further provides a simple testing method for the volume expansion rate and the expansion stress. And the method has obvious engineering application value.

The invention relates to the field of building materials, in particular to high-durability and high-permeability-resistance mortar and a preparation method thereof.The high-durability and high-permeability-resistance mortar is prepared from, by weight, 40-60 parts of cement, 20-40 parts of quartz sand or machine-made sand, 10-20 parts of fly ash or mineral powder, 2-5 parts of polymer emulsion, 1-3 parts of an anti-permeability agent, 0.2-1 part of a water reducing agent, 0.1-0.5 part of a water-retention thickening agent and water; wherein the water cement ratio is controlled to be 0.30 to 0.35. Through collaborative optimization of multiple components, the compactness, impermeability, crack resistance and durability of the mortar are remarkably improved, the preparation process is simple and convenient, the raw materials are easy to obtain, and the mortar has excellent comprehensive performance and wide application prospects.

The invention discloses composite material concrete, a concrete pole and a preparation method of the concrete pole, and relates to the technical field of concrete. The invention relates to composite material concrete, which is prepared from 280 to 300 parts of cement, 120 to 160 parts of coal ash, 400 to 500 parts of composite recycled aggregate, 750 to 850 parts of natural coarse aggregate, 500 to 550 parts of fine aggregate, 0.6 to 1 part of reinforcing fiber, 2.6 to 3.04 parts of composite water reducing agent and 160 to 180 parts of water II, the composite recycled aggregate is prepared by mixing and modifying the recycled aggregate with calcined attapulgite, metakaolin, quick lime, sodium carbonate and a silane coupling agent. The recycled aggregate is subjected to composite modification and is matched with the reinforcing fiber, so that under the condition of the same water cement ratio, the adverse effect of the recycled aggregate on the concrete can be reduced to a certain extent, the compressive strength of the concrete can be effectively improved, and meanwhile, the crack resistance and bending resistance of a cement pole made of the concrete can be improved.

The invention relates to the technical field of circulating fluidized bed flue gas desulfurization, and discloses an automatic control system applied to a CFB desulfurization digester. The feeding unit is used for conveying quick lime and comprises a quick lime bin, a screw feeder and a belt conveying scale which are connected in sequence, and the belt conveying scale is in signal connection with the digestion automatic controller; the digestion reaction unit comprises a three-stage digester and a plurality of digestion thermometers arranged in the three-stage digester, and the digestion thermometers are in signal connection with the digestion automatic controller. The water-cement ratio is dynamically adjusted by monitoring the temperature change trend in real time, fluctuation of the quality of quick lime can be automatically adapted, and the limitation of fixed water-cement ratio control is overcome; by searching the optimal water-cement ratio, the full digestion of the quick lime is ensured, and the activity and uniformity of the slaked lime product are improved; and moreover, the dependence on artificial experience is reduced through automatic control, and the stability and continuity of system operation are improved.

The invention discloses a 3D printing fiber cement-based material based on in-situ polymerization toughening as well as a preparation method and application of the 3D printing fiber cement-based material. The cement-based material is prepared from the following raw materials in parts by weight: 20-25 parts of Portland cement; 7-9 parts of quartz sand; 0.1 to 0.4 part of a polymer monomer; 0.003 to 0.009 part of an initiator; 0.002 to 0.008 part of a polyamino cross-linking agent; 0.12 to 0.18 part of fiber; 0.06 to 0.08 part of a water reducing agent; and 7-10 parts of water. According to the cement-based material, a multi-scale toughening method is adopted, the toughness of the 3D printing cement-based material is greatly improved through polymer monomer in-situ polymerization and fiber doping, and the 3D printing cement-based material has good printability by adjusting the water-cement ratio, the polymer / fiber content, the water reducer content and other parameters of the 3D printing cement-based material. The problem of balance between printability and mechanical properties of traditional 3D printing building materials is effectively solved, and further engineering application of the 3D printing technology can be promoted.

The invention relates to the field of intelligent control, and provides a self-adaptive control system and method for fly ash washing, and the method comprises the steps: carrying out the grouping of the state data of washing liquid in a washing liquid storage tank through employing an AI-based data processing and coding technology; and mapping the grouped parameter data sets to a Gramb angle field, and carrying out feature analysis of a time sequence mode, so as to adaptively adjust a water-cement ratio value based on dynamic memory attention fusion representation between a water washing liquid PH value time sequence mode feature and a water washing liquid conductivity time sequence mode feature. Therefore, the change condition in the washing process can be known in real time, and the water-cement ratio can be adaptively adjusted according to the current state of the washing liquid after washing, so that stable chlorine and heavy metal removal can still be kept when the fly ash with relatively large component fluctuation exists. Meanwhile, the requirement for manual adjustment is reduced, and errors are reduced.

The invention provides low-temperature-resistant concrete as well as a preparation method and application thereof, and belongs to the field of building materials. The low-temperature-resistant concrete disclosed by the invention is prepared from the following raw materials in parts by mass: 100 to 2000 parts of cement, 2000 to 3000 parts of aggregate, 1000 to 3000 parts of sand, 200 to 500 parts of water, 5 to 15 parts of a water reducing agent, 0.1 to 5 parts of a de-foaming agent, 0.01 to 0.2 part of an air entraining agent and 0.01 to 0.2 part of a retarder. The low-temperature-resistant concrete contains the composite cement system composed of the sulphoaluminate cement and the Portland cement, compared with pure Portland cement and pure sulphoaluminate cement, the performance of the composite cement system is more excellent, the early strength of the concrete is improved through optimization of the water cement ratio and the synergistic hydration effect of a composite cement body, and the low-temperature-resistant concrete has the beneficial effects that the early strength of the concrete is improved; the anti-freezing durability in a low-temperature environment is enhanced, the strength loss rate after freezing and thawing cycles is low, and the anti-freezing concrete has a good application prospect.

The invention provides a slurry washing and separating method and device, and relates to the technical field of slurry separation. The N-stage countercurrent washing is carried out in the horizontal screw conveyor, the first two-stage washing and dewatering unit in the prior art is replaced, only one-time dewatering is needed, the equipment operation energy consumption can be obviously reduced, the operation is simplified, the maintenance workload is reduced, the water-cement ratio is reduced, and the water consumption for washing is small. The N horizontal spiral conveyors connected in series are adopted as the N-stage countercurrent washing device to replace the first two stages of washing and dewatering units in the prior art, so that the running power and energy consumption of the equipment can be remarkably reduced, the operation is simplified, the maintenance workload is reduced, the water-cement ratio is reduced, and the water consumption for washing is small.

The invention discloses recycled aggregate self-compacting concrete with excellent impervious and waterproof effects, and relates to the technical field of recycled aggregate concrete.The recycled aggregate self-compacting concrete is prepared from, by mass, 160-180 parts of aggregate particles, 280-300 parts of cement, 3-4 parts of water reducing agent, 1-3 parts of thickening agent, 2-11 parts of air entraining agent, 80-120 parts of mineral admixture, 100-200 parts of water and 7-9 parts of expanding agent. The recycled aggregate self-compacting concrete prepared by the invention is improved in strength, durability and impermeability and waterproofness, and the quality stability of the recycled aggregate is ensured, so that the quality and performance of the finally prepared recycled aggregate self-compacting concrete have consistency, and the recycled aggregate self-compacting concrete can be prepared according to a certain proportioning sequence and proportion. The water-cement ratio is reduced, and the compactness, durability and impermeability and waterproof performance of the concrete are improved at the same time.

The invention belongs to the field of preparation of road base materials, and relates to a method for preparing a road base material from a ternary solid waste cementing material and waste stone powder, which comprises the following steps: mixing fly ash, slag and carbide slag according to a mass ratio of (1-2): (4-5): (4-5) to form an FKD cementing material; uniformly mixing the dried waste stone powder with an FKD cementing material and water according to a water-cement ratio of 1.0; wherein the doping ratio of the FKD cementing material is 5%-30%; the uniformly stirred mixture is divided into three layers to be filled into a test mold, each layer is tamped, and the surface layer is subjected to chiseling treatment after each time of tamping; and putting the sample into a standard curing box, curing for 24 hours, demolding, and continuously curing to a set age. The strength of the prepared road base material is higher than that of a cement road base material of the same age, the utilization rate of the waste stone powder and the industrial waste residues is increased, the cost is reduced, and the road base material is environmentally friendly and conforms to the green development concept.

The application discloses a kind of composite gel-physical foaming synergistic carbon dioxide foam concrete preparation process, carbon dioxide foam concrete, by mass parts, consisting of following components: sulphate cement 15-45 parts, hemihydrate gypsum 10-50 parts, Portland cement 5-15 parts, mineral powder 0-30 parts, gypsum retarder 0-0.3 parts, retarder 0.2-0.4 parts, water reducing agent 0.2-0.4 parts, calcium stearate 0.2-0.6 parts, hydroxypropyl methylcellulose ether (HPMC) 0.1-0.3 parts, water-cement ratio 0.2-0.45, prefabricated foam 5-15 parts.Sulphate cement, Portland cement and hemihydrate gypsum are mixed to prepare carbon dioxide foam concrete when specific mass ratio, can play the hydration synergistic effect between three, and then can greatly improve the mechanical properties of carbon dioxide foam concrete.