340 results about "Foam concrete" patented technology

The invention discloses a fiber foamed concrete and a preparation method thereof. The fiber foamed concrete comprises the following raw materials in parts by weight: 5290 parts of cement, 4965 parts of water, 1.361 part of foaming solution, 1.2964 part of fly ash and 10 parts of fiber. The preparation method comprises the following steps: proportionally weighing the components; sequentially adding the cement and fly ash into a stirrer, proportionally weighing the water, uniformly stirring the mixture by the stirrer, and adding the fiber; preparing and adding the foaming solution; gradually adding the foam into the mixture, and continuously stirring until all the components are uniformly mixed; pouring the mixture into a mold on which lubricating oil is brushed, and curing in a curing chamber; after 24 hours, removing the mold; and respectively curing for 3 days, 7 days and 28 days for experimental detection. The fiber foamed concrete has the advantages of favorable thermal insulation property, favorable compression resistance and favorable bending resistance, and is applicable to a railway bed strengthening layer.

The invention discloses a multi-source data fusion foam concrete construction process monitoring method and system, and relates to the technical field of concrete construction, the method comprises the following steps: obtaining a standard response data set of foam concrete, including raw material ratio parameters and performance index parameters which are stored in an associated manner; constructing and training a hybrid hierarchical performance prediction model, wherein the model comprises a shared prediction layer based on integrated learning and a plurality of independent output layers connected with the shared prediction layer; in combination with a multi-objective optimization algorithm, by taking compressive strength and cost optimization as an objective, constructing an evaluation function for global optimization, and obtaining a target mix proportion scheme; acquiring real-time process data associated with the target mix proportion scheme, and inputting the real-time process data into the mixing layering performance prediction model to obtain a prediction result; and comparing with a preset design target, and generating an adjustment instruction for adjusting the matching parameters of the subsequent stirring batches. The problem that in the prior art, the performance fluctuation of foam concrete of different batches is large due to the fact that the construction condition cannot be dynamically adjusted in real time is solved.

The invention discloses low-carbon red-mud-based alkali-activated foam concrete and a preparation method thereof, and belongs to the field of low-carbon foam concrete. Specifically, the mix proportion and the preparation method of the low-carbon red-mud-based alkali-activated foam concrete are as follows: P.O42.5 ordinary Portland cement provided by building materials in Qingdao Weidong macro, the I-grade fly ash is S95-grade granulated blast-furnace slag produced by Henan Province Platinon Casting Material Co., Ltd., and Jinshu New Material Co., Ltd., the I-grade fly ash is S95-grade granulated blast-furnace slag produced by Henan Province Platinon Casting Material Co., Ltd. The Bayer process red mud powder is produced by Hebei Province Shihozhuangfei Mine Product Co., Ltd. The exciting agent is selected from an industrial liquid sodium silicate solution produced by Henan Jinmoistening New Material Co., Ltd. And solid sodium hydroxide particles with AR analytical purity of 96%; the admixture is selected from a TR-26C type polycarboxylate superplasticizer produced by Henan Fuhua Information Science and Technology Co., Ltd. And the foaming agent is a TR-E type animal protein foaming agent produced by Henan Zhuichun Information Science and Technology Co., Ltd. Compared with existing foam concrete, the low-carbon alkali-activated foam concrete provided by the invention uses a large amount of industrial solid waste, reduces the use cost, reduces the use amount of cement under the condition of ensuring the compressive strength, and is simple and convenient to operate, reasonable in process, low-carbon, environment-friendly, rapid in cement setting and hardening, and suitable for large-scale use.

The utility model provides a tunnel inverted arch structure which comprises a corrugated steel plate layer, a secondary lining layer, a frame column layer and a pavement layer which are sequentially arranged from bottom to top, and the corrugated steel plate layer is provided with a grouting hole and an anchor rod hole for a system anchor rod to penetrate through. Foam concrete is injected into an interlayer space between the corrugated steel plate layer and the surrounding rock through the grouting holes to form a foam concrete layer, the system anchor rod comprises an anchoring end and a locking end which are oppositely arranged in the extending direction of the system anchor rod, the anchoring end penetrates through the anchor rod hole to be anchored into the surrounding rock, and the locking end is connected with the corrugated steel plate layer. The secondary lining layer is arranged on the inner wall of the corrugated steel plate layer, the bottom of the frame column layer is pre-buried in the secondary lining layer, and the pavement layer is laid on the top of the frame column layer. According to the novel inverted arch structure, particularly, a traditional inverted arch backfilling layer is arranged to be of a frame layer structure, the use amount of concrete can be greatly reduced, the safety and stability of a tunnel are guaranteed, meanwhile, the material cost and the construction cost are reduced, and economic benefits are improved.

The invention relates to the field of construction tools, in particular to light foam concrete pouring and conveying equipment which structurally comprises a base, a horizontally-arranged discharging device is arranged at the top of the base, an upper cover plate is installed on the upper surface of the discharging device, a feeding pipe is arranged on one side of the upper cover plate, and the discharging device comprises a guide pipe and a buffer. The buffer is connected with a feeding hopper, the feeding hopper and a bottom pipe at the bottom form a groove body, a rotary feeding rod is arranged in the buffer and the bottom pipe, the feeding rod is connected with a driving motor main shaft installed outside the feeding hopper, the synchronous motor drives the middle pipe to rotate, and the synchronous motor is electrically connected with a driving motor main board. The long-distance conveying capacity of foam concrete is achieved, defoaming in the start-stop process is greatly reduced, the effective pushing torque of the feeding rod is concentrated in the axial conveying direction by means of the segmented design of the pre-conveying section and the conveying section of the feeding rod and the radial limiting effect of the buffer, radial overflow of materials is restrained, and damage to foam caused by radial shearing is reduced.

The utility model provides an air bag device for construction of a cross-fault tunnel foam concrete buffer layer. The air bag device comprises an inflatable flexible air bag, a first annular closed steel formwork and a second annular closed steel formwork. The first annular closed steel formwork and the second annular closed steel formwork are arranged at the two ends of the inflatable flexible air bag. An inflation connector is arranged at one end of the inflatable flexible air bag, and a first filling pipeline and a second filling pipeline are arranged on the first annular closed steel formwork and the second annular closed steel formwork. The construction efficiency is remarkably improved on the premise of not losing the shock absorption and isolation performance of the foam concrete, one-time forming is achieved, the construction quality is guaranteed, and the cost is saved; in addition, due to the reusable characteristic of the air bag device, the construction cost is further reduced, and the problems that in a traditional construction method, efficiency is low, the seismic mitigation and isolation performance of the expanded excavation section foam concrete buffer layer is difficult to guarantee, and cost is high are solved.

The invention discloses light soil with a bionic multilayer structure for water conservancy slope protection and a preparation process of the light soil, and belongs to the field of water conservancy slope protection materials. In order to solve the problems that an existing slope protection material is poor in mechanical stability and ecological vegetation compatibility and prone to interlayer stripping, the light soil is integrally formed into a high-strength framework core layer, an ecological nutrition transition layer and an anti-scouring vegetation surface layer from inside to outside, and the volume ratio of the three layers is 5: 3: 2-6: 2: 2; the core layer contains light foam concrete, fibers and nano silicon dioxide, the transition layer contains porous ceramsite and slow release fertilizer, and the surface layer contains mixed seeds and anti-erosion fibers. During preparation, interlayer meshing is realized by vibrating and embedding the transition layer before initial setting of the core layer, and demolding is performed through standard curing. The anti-scouring flow velocity of the product is larger than or equal to 2.0 m / s, the interlayer shear strength is larger than or equal to 0.2 MPa, the three-month vegetation coverage rate is larger than or equal to 60%, mechanical protection and ecological functions are considered, and the method is environmentally friendly, economical and suitable for slope protection projects of rivers, reservoirs and the like.

The invention relates to a device and method for evaluating the uniformity of foam concrete, and belongs to the technical field of concrete.The method comprises the steps that a concrete test piece is formed through a cubic mold; uniformly dividing the upper surface of the concrete test piece into a plurality of sections, placing an ultrasonic scanning unit on each section of the concrete test piece for ultrasonic detection in sequence, recording the sound velocity of each measuring line, and calculating to obtain the average sound velocity Vk of each section; calculating a homogeneity coefficient lambda; and when the uniformity coefficient lambda is smaller than a uniformity coefficient threshold value specified by the corresponding density, determining that the uniformity of the concrete is qualified, otherwise, determining that the concrete is unqualified. According to the method, pores in the concrete are rapidly positioned by using an ultrasonic detection technology, the uniformity of the foam concrete is judged through discreteness of the acoustic velocity, and the method has the advantages of reliable detection result, simplicity and convenience in operation and the like.

The invention relates to the technical field of geotechnical engineering and slope reinforcement, and discloses a foam concrete-based expansive soil slope reinforcement structure which comprises a slope body and a foam concrete prefabricated reinforcement assembly mounted on the slope body through anchor rods, and the reinforcement assembly comprises a first reinforcement layer and a second reinforcement layer which are sequentially arranged on the slope surface of the slope body; the first reinforcing layer comprises a plurality of first reinforcing units arranged in the length direction of the slope body. By means of the double-layer design of the first reinforcing layer and the second reinforcing layer, the first prefabricated slab is longitudinally connected in an inserted mode through a dovetail or T-shaped tenon-and-mortise structure to achieve seamless attachment, the second prefabricated slab presses and covers tenon-and-mortise joints and is clamped and locked through the annular connecting piece, a latticed system of transverse restraining and longitudinal locking is formed, the structure can resist volume expansion of expansive soil by 30% or above, and the expansive soil is not prone to deformation. A soil body loss channel is effectively blocked, and the linkage problem of loosening-cavity-instability of a traditional prefabricated part is solved.

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.

The invention discloses a foam concrete carbon sequestration rate evaluation method, foam concrete carbon sequestration rate evaluation equipment and a medium, and relates to the field of carbon neutralizer.The method comprises the steps that the apparent density of a CO2 foam concrete sample is measured; determining the theoretical matrix density of the concrete matrix; calculating the mass of CO2 in bubbles in the unit mass sample according to the apparent density and the theoretical matrix density; calculating a physical sealing rate according to the mass; based on a chemical curing amount detection method, determining the CaCO3 content measured by mu-XRD and the active calcium oxide content detected by LIBS; the chemical curing amount detection method comprises a mu-XRD method and an LIBS method. Determining a chemical curing rate according to the CaCO3 content and the active calcium oxide content; and determining the total carbon sequestration rate of the foam concrete according to the physical sequestration rate and the chemical curing rate. According to the method, the accurate carbon sequestration rate can be calculated.

The invention belongs to the technical field of concrete, and particularly relates to carbon dioxide foam concrete as well as a preparation method and application thereof. Comprising the following steps: obtaining a gel raw material comprising cement, a nano filler and a mineral admixture, and preparing the gel raw material into cement paste; the preparation method comprises the following steps: preparing a foaming solution from a hydrogel thickener, a water repellent agent, a foaming agent and water, and introducing gas containing carbon dioxide to prepare carbon dioxide foam; carbon dioxide foam and cement paste are mixed to prepare mixed paste, and the mixed paste is formed to obtain a formed concrete blank; and performing internal carbonization curing and external carbonization curing on the concrete green body, and performing natural curing to obtain the carbon dioxide foam concrete. Through internal and external carbonization maintenance, a large amount of carbon sequestration is realized, micropores are filled by virtue of a product generated by carbonization, the aperture is refined, the collapse of a foam structure is reduced, the foam concrete is enhanced, the compressive strength and durability of the carbon dioxide foam concrete are improved, and the durability of the carbon dioxide foam concrete can be enhanced.

The invention discloses foam concrete based on acidic iron tailing sand. The foam concrete comprises the following components in parts by weight: 200-500 parts of cement, 100-400 parts of acidic iron tailing sand, 50-150 parts of superfine slag powder, 15-25 parts of a composite acid-resistant foaming agent solution, 1-10 parts of composite fibers and 200-300 parts of water, the composite acid-resistant foaming agent solution is prepared by mixing a composite acid-resistant foaming agent and water, and the composite fiber comprises a combination of organic reinforced fiber and inorganic modified fiber. According to the preparation method, the long-term stability and the acid resistance of the foam concrete can be remarkably improved, and meanwhile, the overall performance of the foam concrete is remarkably improved by utilizing the acid resistance and the high temperature resistance of the polymer coated aluminum silicate fibers.

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 present application relates to the technical field of concrete, and particularly relates to a method for preparing foam concrete by using carbon dioxide foam, which comprises the following steps: preparing super-stable carbon dioxide foam: uniformly dispersing nanoparticles in water to prepare a nanoparticle suspension; adding a surfactant to the nanoparticle suspension and uniformly stirring to prepare a nanoparticle foaming agent; sucking the nanoparticle foaming agent by a foaming machine, and introducing carbon dioxide to prepare stable carbon dioxide foam; uniformly stirring water and a water reducing agent in cement to obtain a cement slurry, introducing carbon dioxide gas into the cement slurry to obtain carbonated cement slurry; adding a foam stabilizer to the carbonated cement slurry and the prepared carbon dioxide foam, and continuously stirring until the carbon dioxide foam is completely introduced into the cement slurry. The foam concrete prepared by the method has a density which is at least one third lower than that of the existing method under the condition of unchanged strength, so that the application scenarios of the foam concrete are increased.

The present application relates to the technical field of foam concrete preparation, in particular to foam concrete based on ettringite micro-expansion effect and a preparation method thereof, the preparation method comprising the following steps: S1. preparation of modified ettringite; S2. dry material premixing; S3. preparation of additives; S4. concrete forming. The modified ettringite and modified calcium sulfate synergize to significantly improve the interfacial bonding strength of aggregate-matrix, so that the early and medium-term compressive strength of the composite system is improved; at the same time, the improved pore structure forms a triple action mechanism of "ettringite reinforcement-pore optimization-stress buffering": ettringite improves the interfacial bonding and shrinkage compensation capacity, the dissolution space of aggregate absorbs the volume deformation stress, the pore structure optimization reduces the humidity diffusion gradient, and the strength-shrinkage synergistic control is realized.

The application discloses a modified wheat straw fiber reinforced foam concrete backfill material and a preparation and use method, and belongs to the field of civil engineering foundation filling construction. The backfill material is composed of concrete dry powder, a composite foaming agent and modified wheat straw fiber. The modified wheat straw fiber is obtained by corroding wheat straw segments with alkali solution, and then immersing the alkali-corroded wheat straw segments into a fiber surface coating film glue solution or directly spraying a layer of fiber surface coating film glue solution on the surface of the alkali-corroded wheat straw segments, so that a layer of fiber surface coating film is attached to the surface of the wheat straw segments. In use, the concrete dry powder, the composite foaming agent and the modified wheat straw fiber are mixed into a slurry according to a proportion and filled into a fat groove. The modified wheat straw fiber is added into the foamed concrete, so that the defects of poor shearing resistance and weak impact resistance of traditional foam concrete filling materials are overcome, and the added industrial value of the wheat straw is improved.

The application discloses a kind of overhanging roadbed structure and construction method, belong to high fill section deep soft soil roadbed engineering technical field.The roadbed structure includes pipe pile support structure, leveling layer, shear layer and pavement structure layer, the leveling layer and shear layer are both foam concrete pouring layer, the pipe pile contains one or more lengths, and can be spliced.The construction method includes that after pipe pile is implanted foundation, first rough leveling is carried out by pipe pile, then fine leveling is carried out by leveling layer, the leveling layer and shear layer are both poured and constructed by the working face of temporary platform, batten board construction and the formwork of rigid bar piece, the leveling layer, shear layer and reinforced layer are used to transmit structure dead load and live load to pile cap and pipe pile.The roadbed structure and construction method of the application do not need to cut pile, have excellent structure durability and are economical and practical.

The application discloses a kind of foam concrete rheological property testing device and evaluation method, including isobaric pipeline, isobaric pipeline extension direction is provided with several branch pipes, several grouting holes are provided on each branch pipe, each grouting hole is respectively communicated with one detachable acrylic pipe, detection steel pipe is provided at the bottom of one detachable acrylic pipe, the top of the detection steel pipe is not in contact with the inner wall of the top surface of detachable acrylic pipe, and the bottom thereof passes through the bottom of detachable acrylic pipe and extends out.The application solves the problem of single pouring object in the prior art, and quantitatively evaluates the pouring compactness and rheological property of foam concrete in the limited closed space during tunnel construction.

The application belongs to the technical field of combined filling equipment, and particularly relates to a vertical combined filling equipment and a use method thereof. In view of the problem that the internal part of a mixing device cannot be cleaned in time, stirring operation needs to be performed for a long time, and the preparation efficiency of foamed concrete slurry is low, the following scheme is provided. The vertical combined filling equipment comprises a lower support, an upper support is fixed on the top of the lower support through bolts, a stirring and mixing box is fixed on the top of the lower support through bolts, a concrete box and two preparation boxes are fixed on the top of the upper support through bolts. In the application, foaming agent diluent can be uniformly sprayed on the stirring concrete through the spraying structure, so that the mixing of the concrete and the foaming agent can be quickly completed, the preparation efficiency of the foamed concrete slurry is improved, in addition, the start and stop of the strong magnet can be controlled through the pressure of the concrete on the sliding plate, the lifting of the iron nut ring can be controlled through the strong magnet, and the inner wall of the stirring and mixing box can be automatically cleaned.

The invention relates to a foam concrete product with a pumice-encapsulated soya wax phase change material and a method of manufacturing the product.

The application discloses high-performance desert sand foam concrete and a preparation method thereof. The concrete comprises the following components in parts by weight: 70 parts of Portland cement, 30 parts of fly ash, 20-100 parts of desert sand, 25-35 parts of salt water, 0.2-0.5 parts of a foaming agent, 5-12 parts of a composite activator, 5-15 parts of alkali-activated metakaolin composite microbeads and 0.5-2 parts of a roughened PET polymer fiber. The composite activator is composed of calcined phosphogypsum, alkali residue, nano silicon dioxide, silica fume and 5% mass concentration polyvinyl alcohol in a weight ratio of (40-50):(30-40):(10-15):(5-10):(10-15). The alkali-activated metakaolin composite microbeads are composed of fly ash floating beads, metakaolin, water glass, sodium hydroxide and deionized water in a weight ratio of 100:(20-30):(15-25):(3-5):(20-30). The application is particularly suitable for a buffer pressure relief filling layer between primary support and secondary lining in a tunnel engineering, thereby effectively reducing high ground stress and stratum load acting on a tunnel lining structure.

The present application relates to a kind of assembled frame structure earthquake response prediction algorithm based on LSTM algorithm, by establishing full-scale structure model and using ABAQUS to carry out nonlinear time-history analysis, obtain ground motion and inter-story displacement response data, construct structure earthquake response database.Based on the numerical simulation result, establish deep learning architecture, by the sensitivity study of window length, hidden layer and training sample size, use R and RMSE such as index to evaluate model performance, and select the model with minimum validation loss as the final prediction model.In the prediction phase, input any ground motion record can quickly generate complete inter-story displacement time-history through recursive slicing and step-by-step updating mechanism, so as to realize the efficient estimation of aluminum alloy foam concrete structure earthquake response.The present application can replace the high-cost iterative calculation of traditional finite element analysis, and provide fast and reliable decision support for regional seismic risk assessment, structure safety determination and aluminum alloy foam concrete structure seismic design.

The utility model discloses a foam concrete thermal insulation building block vertical batching device which comprises a main body frame, operation platforms are evenly installed in the main body frame, storage hoppers are installed on the two sides of each operation platform, a feeding port is formed in the top of each storage hopper, and a discharging port is formed in the bottom of each storage hopper. A spiral weighing feeder is installed at the discharging port, the feeding end of the spiral weighing feeder is communicated with the discharging port, a vertical spiral conveyor is fixed to the center of the operation platform and penetrates through the center of the main body frame, and material inlets are evenly formed in a machine barrel body at the bottom of the vertical spiral conveyor. A material collecting hopper is welded to the portion, located on the outer side of a material inlet, of a machine barrel body of the vertical spiral conveyor, the discharging end of the spiral weighing feeder is connected with the interior of the material collecting hopper, a plurality of material storage hoppers and the vertical spiral conveyor are vertically integrated in a compact main body frame, the occupied area of equipment is remarkably reduced, and the space utilization rate is increased.

This invention belongs to the field of building materials technology, specifically disclosing a sound-absorbing porous foamed concrete composite board and its preparation method. Using foamed concrete as the substrate of the composite board effectively solves the problem of poor environmental performance of traditional sound insulation materials. Compared with materials such as polystyrene and sound-absorbing rock wool, it does not require a large amount of energy for preparation and can utilize recycled raw materials. It does not produce toxic powder after aging, reducing harm to the air environment and human health, while also avoiding the flammability hazards of traditional materials. The closed-cell sound insulation layer's sealed pores can block direct sound wave penetration, achieving basic sound insulation. The sound-absorbing pores of the porous sound-absorbing layer, combined with the interconnected channels, introduce incident sound waves into the interior. Energy is dissipated through reflection and friction within the channels, forming a dual protection of "sound absorption and sound insulation." This solves the core problem of poor sound insulation performance of traditional concrete and compensates for the short lifespan of traditional sound insulation materials, extending the overall service life of the board.

The invention discloses multi-element solid waste foam concrete and a preparation method thereof, and relates to the technical field of foam concrete. The multi-element solid waste foam concrete comprises slag, fly ash, ardealite, sodium dodecyl benzene sulfonate and water, the invention relates to an alkali-free concrete which comprises the following components in parts by mass: 250-350 parts of fly ash, 5-20 parts of aluminum powder and 0-20 parts of a liquid alkali-free accelerator, and further comprises the following components in parts by mass: 250-350 parts of fly ash, 5-20 parts of aluminum powder and 0-20 parts of a liquid alkali-free accelerator. Compared with the traditional foam concrete, the materials used in the invention are all industrial solid wastes, and cement is not doped, so that the carbon emission of cement production is reduced while the solid wastes are consumed and the solid waste stockpiling pressure is relieved. When the multi-element solid waste foam concrete is applied to an outer wall enclosure structure, due to the fact that the multi-element solid waste foam concrete is light in weight, has many spherical pores, excellent heat preservation performance and low dry density, the self-weight pressure of a high-rise building is reduced, cold and heat transmission paths are reduced, the heat conductivity coefficient is lower, and a large amount of energy consumed by refrigeration and heat is reduced.

The application discloses low-shrinkage light-weight high-strength alkali-activated foam concrete and a preparation method and application thereof. The raw material composition of the foam concrete comprises 30-80 parts by weight of slag powder, 40-120 parts by weight of mineral admixture, 2-15 parts by weight of porous filler, 5-20 parts by weight of sodium-potassium water glass, 0.5-10 parts by weight of foaming agent and 0.5-5 parts by weight of anti-shrinkage agent. The anti-shrinkage agent is prepared by the following method: placing water-absorbing resin in a saturated shrinkage reducing agent solution, keeping under heating conditions, making the water-absorbing resin reach a saturated water state, and then separating the water-absorbing resin and draining the liquid to obtain the anti-shrinkage agent. The application not only reduces the self-shrinkage degree of the alkali-activated foam concrete, overcomes the shrinkage and cracking problem of the foam concrete during service, but also increases the compressive strength of the alkali-activated foam concrete.

The invention belongs to the technical field of sewage treatment, and provides a filter material, a filter unit and a filter system.According to the filter material, the filter unit and the filter system for manganese ion-containing sewage treatment, a filter plate is provided with water through holes in the filter direction so that manganese-containing sewage can smoothly pass through the filter plate, and the filter plate is provided with water through holes in the filter direction; meanwhile, sufficient contact of sewage and filter plate materials is guaranteed, the forming direction of the water through holes is consistent with the sewage flowing direction, and sewage flowing resistance can be reduced. Through the synergistic effect of the porous structure of the adsorption foam concrete and various adsorption materials, synchronous and efficient removal of manganese ions and sulfate ions is realized, and the limitation of single pollutant treatment in the prior art is solved; due to the loose porous structure and reasonable raw material ratio, the adsorption efficiency is ensured, and the problem of secondary pollution caused by a chemical precipitation method is avoided; the material of the filter plate has adsorbability and structural strength, and is suitable for complex terrains and working conditions of multi-mountain mineral areas.

In various embodiments, the present invention provides methods of preparation of a foamed concrete, foamed concretes obtained or obtainable according to such methods, and uses of such foamed concretes. The methods comprise steps of providing a cementitious slurry having a specified composition, providing a protein-stabilised aqueous foam, and mixing the slurry with the protein-stabilised aqueous foam in predetermined ratio to form an aerated slurry mixture. The mixing ratio of the cementitious slurry and the protein-stabilised aqueous foam is selected such that the overall density of the aerated slurry mixture is 400 kg / m3 or less.

According to the rapid construction structure and method for the foam concrete flexible filling retaining wall, through the modularized first baffle device and the modularized second baffle device, when the retaining wall is constructed in a goaf, a pouring mold used for pouring the retaining wall can be rapidly constructed in a roadway of the goaf, and rapid construction of the foam concrete flexible filling retaining wall is achieved. Secondly, according to the embodiment, through reserved filling devices arranged at the tops of the first baffle device and the second baffle device, the whole filling area space is gradually filled with foam concrete from bottom to top, then the embedded pipelines and the supporting structure are well wrapped, and the foam concrete is tightly attached to rock walls on the top plate and the two sides of the roadway; and no gap and no delamination are ensured between the filling body and the surrounding rock.