373 results about "Aggregate (composite)" patented technology

The invention discloses a light telegraph pole cement material and a preparation method thereof, and relates to the technical field of cement concrete. The method comprises the following steps: firstly, carrying out acid pickling, silane coupling agent grafting and nanoparticle vacuum impregnation treatment on shale ceramsite to obtain modified light ceramsite; the preparation method comprises the following steps: ultrasonically dispersing graphene oxide, compounding with Portland cement clinker and modified fly ash, and reacting with epoxy resin emulsion, a curing agent and a silane coupling agent to prepare organic-inorganic composite modified cement; the bamboo skeleton is subjected to silane coupling agent pretreatment to obtain a modified skeleton; then, mixing composite cement, an additive and water into slurry, adding the modified ceramsite and aggregate, and performing high-speed stirring and ultrasonic dispersion to form homogeneous concrete slurry; and finally, putting the modified bamboo skeleton into a mold, injecting the slurry, and performing centrifugal forming, steam curing and natural curing to obtain the cement material. The prepared lightweight telegraph pole cement material has excellent mechanical strength.

The invention discloses a high-content fly ash unfired water permeable brick and a preparation method thereof, and relates to the technical field of building materials, the unfired water permeable brick comprises the following raw materials by weight: 55-75 parts of fly ash, 20-35 parts of aggregate, 8-15 parts of a composite cementing material, 0.5-2 parts of toughening fiber, 1-3 parts of a pore regulator, 0.1-0.5 part of a surfactant, and 10-18 parts of water. Wherein the aggregate is 1-3mm waste ceramic particles and 2-5mm building recycled aggregate (1: 1-1: 2); and the rest components have specific proportions, specifications and modification requirements. According to the invention, 55-75 parts of F-type II-grade or higher high-content fly ash is matched with the waste ceramic particles and the pretreated building recycled aggregate to serve as the composite aggregate, solid waste is digested, natural resource dependence is reduced, and the method conforms to the direction of green building materials; by means of a modified composite fiber and composite gel system, the pressure resistance is larger than or equal to 25 MPa, the fracture resistance is larger than or equal to 3.5 MPa, the water permeability is larger than or equal to 1.5 * 10 cm / s, the freeze-thaw loss is smaller than or equal to 3.5%, and the grinding pit is smaller than or equal to 30 mm; through graded mixing, bidirectional pressurization and segmented maintenance, the porosity is kept to be 15%-25%, the percent of pass is increased, and the cost is reduced.

The invention discloses a method for improving the performance of recycled aggregate concrete, and belongs to the technical field of building materials. The preparation method comprises the following steps: preparing a modified solution which is compounded by double components of gamma-methacryloxy propyl trimethoxy silane and vinyl triethoxy silane; carrying out surface modification on the recycled aggregate by adopting a graded pre-wetting-spraying composite modification method; preparing a slag powder-fly ash-nano silicon dioxide ternary composite admixture; preparing a concrete mixture according to the mixing ratio; through surface modification of the silane coupling agent and cooperation of the composite admixture, the problems of poor workability and low strength of the concrete caused by high water absorption of the recycled aggregate are effectively solved, the 28d compressive strength of the prepared concrete is improved by 20-30%, the anti-freezing grade reaches F200, and the shrinkage rate is reduced by 15-25%.

The invention discloses sulfate-erosion-resistant metakaolin-slag-based geopolymer concrete, belongs to the technical field of concrete, and aims to solve the problems that the corrosion resistance of traditional silicate concrete is ineffective and the adaptability of conventional alkali-activated concrete is insufficient in a special environment. The concrete comprises the following components in parts by weight: 60-90 parts of a cementing material, 120-170 parts of aggregate, 15-30 parts of a composite activator, 2-8 parts of a function regulator and the like, the cementing material is prepared from nano TiO2 / KH-550 composite modified metakaolin, slag and silica fume-coal gangue powder-HAP composite powder; the aggregate comprises modified limestone macadam (soaked and dried by a sodium dihydrogen phosphate solution) and river sand; the composite exciting agent comprises water glass, sodium hydroxide, sodium pyrophosphate, propylene glycol and the like; the function regulator comprises superfine fly ash, a naphthalene water reducer, HPMC (Hydroxy Propyl Methyl Cellulose) and boric acid. Through the synergistic effect of the components, the sulfate corrosion resistance, the mechanical property and the environmental adaptation performance of the concrete are improved, and the concrete is suitable for engineering construction under the service environment of high-concentration sulfate and the like.

The invention discloses light building corrosion-resistant fiber concrete and a production method thereof, the light building corrosion-resistant fiber concrete comprises the following raw materials by mass: 300-400 parts of high belite sulphoaluminate cement, 10-20 parts of modified corrosion-resistant fiber, 50-80 parts of a mineral admixture, 800-1000 parts of a coarse aggregate, 600-700 parts of a fine aggregate, 5-10 parts of a composite admixture, and 120-150 parts of water; wherein the mineral composition of the high belite sulphoaluminate cement is as follows: 18 to 25 percent of C4AF, 15 to 20 percent of anhydrous calcium sulphoaluminate (C4A3S), 45 to 55 percent of belite (C2S) and less than or equal to 10 percent of other minerals. By optimizing the ratio of C4AF to anhydrous calcium sulphoaluminate in the high belite sulphoaluminate cement and combining with a special calcining process, the contradiction of low early strength caused by increase of the content of C4AF is solved, and meanwhile, a foundation is laid for long-term corrosion resistance; and by adopting a silane coupling agent-nano silicon dioxide composite modification technology, the limitation of limited single modification effect is solved, and the synchronous improvement of the corrosion resistance of the fiber and the interface bonding strength is realized.

The invention belongs to the technical field of centrifugal processes, and particularly discloses a centrifugal process in composite forming of a large tubular pile, which comprises the following five centrifugal stages: a low-speed centrifugal stage, a medium-low-speed centrifugal stage, a medium-speed centrifugal stage, a high-speed centrifugal stage and a shutdown centrifugal stage, an S-shaped acceleration curve is generated through cubic spline interpolation between every two adjacent centrifugal stages for speed adjustment, and the centrifugal speed adjustment is changed from instant switching to 8-12 s gradual transition acceleration from the middle-low speed centrifugal stage to the middle speed centrifugal stage; and the large-particle-size aggregate and the fine-particle aggregate are kept relatively synchronous when the radial position is adjusted through gradual transition acceleration. A five-stage progressive rotating speed control strategy is adopted, an S-shaped acceleration smoothing algorithm is introduced into a transition area of each stage, the acceleration change rate is controlled to restrain sudden change of a centrifugal force field, and uniform particle size distribution of concrete materials in the centrifugal forming process is achieved in cooperation with a high-precision rotating speed feedback system and a dynamic balance compensation mechanism.

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 relates to the technical field of civil engineering, and discloses anti-seepage and anti-fracture DRMMA resin polymer mortar and a preparation method thereof.The mortar is composed of composite aggregate, DRMMA resin surface glue and a curing agent, the adding proportion of the composite aggregate to the DRMMA resin surface glue is 100: 20, the adding amount of the curing agent is 3%-3.1% of the mass of DRMMA resin, and the adding amount of the DRMMA resin polymer mortar is 1%-3% of the mass of the DRMMA resin. The composite aggregate forms a compact framework through graded filling of quartz sand and superfine silica fume, DRMMA resin surface glue serves as a high-performance organic cementing material to form a tough bonding network, a methyl ethyl ketone peroxide curing agent ensures a rapid and stable curing reaction with an accurate addition amount, and functional complementation is achieved through the synergistic effect of the three components. A standardized two-stage mixing preparation process is adopted, first-stage mixing ensures that aggregate and resin are fully infiltrated, second-stage mixing introduces a curing agent to achieve homogeneous initiation, the stability of a finished product is ensured by controlling technological parameters, the method is easy to operate, a common double-horizontal-shaft stirrer in existing civil engineering can be directly used for implementation, and the final cost is reduced.

The invention relates to the technical field of reinforced concrete, in particular to a preparation technology of a reinforced concrete telegraph pole, the performance of the concrete telegraph pole is improved through a multi-scale fiber synergistic toughening method, when the telegraph pole bears a bending load, steel fibers firstly play a role to restrain large cracks, and when micro cracks appear, the steel fibers play a role to restrain the large cracks. The denser composite fiber network bears stress to realize multi-stage crack resistance, which is combined with the high early strength characteristic of the sulphoaluminate cement, so that the telegraph pole has excellent impact resistance and fatigue resistance while obtaining extremely high early strength; the surface of the aggregate modified by the silicon dioxide aerogel is covered with a high-activity and high-specific-surface-area nano silicon dioxide layer, and in an alkali-rich and calcium-rich environment provided by sulfo-aluminate water cement hydration, the nano silicon dioxide and a cement hydration product are subjected to a violent pozzolanic reaction, so that the surface of the aggregate is modified by the sulfo-aluminate water cement; therefore, the compressive strength and the flexural tensile strength of the concrete are remarkably improved.

The invention discloses concrete with anti-freezing performance and a preparation method thereof, and belongs to the technical field of concrete. The invention aims to solve the problems that the porosity of an interface transition area is high, hydration products are easy to degrade and the anti-freezing and anti-permeation performances are insufficient under the working conditions of high altitude, low air pressure, strong ultraviolet rays and salt-freezing synergy of the existing large-dosage fly ash concrete. The concrete is prepared from the following components in parts by weight: 100 parts of cement, 100 to 150 parts of coal ash, 280 to 320 parts of fine aggregate, 1000 to 1200 parts of modified basalt coarse aggregate, 1.5 to 3.5 parts of polycarboxylic acid water reducing agent, 0.2 to 0.6 part of PEG (Polyethylene Glycol) coated chitosan quaternary ammonium salt microspheres, 0.05 to 0.25 part of chitosan grafted nano cerium oxide composite particles, 1.0 to 3.0 parts of bacillus pseudofirmus microcapsule-polyvinylpyrrolidone mixture and 0.03 to 0.12 part of trisodium citrate. Through the synergistic effect of all the components, the interface structure of the concrete is effectively optimized, the ultraviolet aging resistance, the salt-freezing synergistic damage resistance and the chloride ion infiltration resistance are improved, the high-altitude severe service condition is adapted, and reliable material support is provided for high-altitude infrastructure construction.

The invention relates to the technical field of coal gangue activation, and discloses a coal gangue activation process optimization method and system for preparing a cementing material and filling aggregate, and the method comprises the following steps: carrying out crushing, screening and sorting pretreatment on a coal gangue raw material; the pretreated coal gangue particle material is subjected to physical synergistic activation; carrying out chemical compound activation on the coal gangue particle material subjected to physical activation; sampling and detecting the coal gangue particle material subjected to composite activation; an artificial intelligence large model is constructed to analyze detection data, the activation degree is quantitatively evaluated, and the performance strength is predicted; and dynamically generating an optimization instruction aiming at preparation process parameters, and preparing the cementing material and the filling aggregate. The activation efficiency and product performance of the coal gangue are improved, high-added-value resource utilization of the coal gangue is achieved, and an effective technical support is provided for large-scale consumption of the coal gangue and development of green building materials.

The invention discloses a lightweight high-strength high-toughness cement-based composite material and a preparation method thereof. The composite material is prepared from the following components in parts by mass: 1000 parts of a cementing material, 200-400 parts of fine aggregate, 150-250 parts of water, 10-30 parts of a water reducing agent, 14-23 parts of synthetic fiber and 10-30 parts of silicon dioxide aerogel. The preparation method comprises the following steps: mixing and stirring 1000 parts of the cementing material, 200-400 parts of the fine aggregate and 10-30 parts of the silicon dioxide aerogel to obtain a dry material, then adding 10-30 parts of the water reducing agent and 150-250 parts of the water into the dry material, mixing and stirring to obtain neat paste, and finally adding 14-23 parts of the synthetic fiber into the neat paste while stirring, and mixing and stirring to obtain slurry. The light-weight, high-strength and high-toughness cement-based composite material is few in component variety, simple in preparation method, low in volume weight, high in strength and large in ultimate tensile strain, and the problems that a traditional light-weight and high-toughness cement-based material is large in light-weight aggregate mixing amount, low in strength, poor in ductility and stability and the like are solved; and the method has a wide application prospect in infrastructures such as high-rise building structure facades and large-span bridge structure pavement layers.

The invention relates to a composite internal curing material for ultra-high performance concrete and a preparation method of the composite internal curing material. 100 to 160 parts of natural aggregate; 5 to 12 parts of magnesium oxide, 1.5 to 3.5 parts of ammonium dihydrogen phosphate, 1.5 to 5 parts of deionized water and 0.5 to 1.2 parts of carbon nanotube; wherein the magnesium oxide, the ammonium dihydrogen phosphate, the deionized water and the carbon nanotubes are treated to form an MPC / CNT composite coating, and the surface of the natural aggregate is coated with the MPC / CNT composite coating. By means of the MPC / CNT composite coating, water is efficiently stored and slowly released through an internal optimized multi-stage pore structure, and chemical shrinkage in the UHPC hydration process is accurately compensated. Meanwhile, the coating enhances the hydration degree of a matrix and strengthens an aggregate-slurry interface transition area, so that the self-constriction micro-strain is remarkably reduced, and the early cracking risk of the material is fundamentally reduced.

The invention relates to the technical field of building materials, and discloses a preparation method of biomass aggregate lightweight wall impervious concrete and concrete.The preparation method comprises the following steps that 1, biomass aggregate is pretreated, specifically, a rice hull or straw biomass raw material and a sintering agent are mixed, pressed and formed, sintering in a vacuum furnace to prepare biomass-based wood ceramic spherical particles; (2) aggregate surface hydrophobic treatment: pretreating the biomass-based wood ceramic spherical particles obtained in the step (1) with a surfactant solution, and then carrying out vacuum impregnation treatment with a paraffin-silane composite emulsion; by adopting surfactant pretreatment and a paraffin-silane composite emulsion vacuum impregnation process, a surfactant can reduce the surface tension of an emulsion and promote a hydrophobic component to permeate into internal pores of the aggregate, and a vacuum environment eliminates air resistance in the pores, so that a hydrophobic material and pore walls of the aggregate form firm combination, and the hydrophobic effect is more lasting.

The invention relates to the technical field of concrete, in particular to a high-bending-resistance road concrete material and a preparation method thereof.The high-bending-resistance road concrete material is prepared from, by weight, 100 parts of aluminate cement, 6-8 parts of filler, 1-1.4 parts of additive, 350-400 parts of basalt coarse aggregate, 200-250 parts of medium sand, 33-37 parts of mixing water and 0.7-0.9 part of polycarboxylate superplasticizer. In the invention, the additive powder modified by the composite solution is mixed with the mineral powder activated by the premixed solution to form a filler with a microporous structure and rich surface functional groups, the microporous structure can internally maintain moisture, so that cement is fully hydrated and pores are refined, and the functional groups can generate a synergistic effect with cement ions and fibers in the additive, so that the cement can be fully hydrated. Cracks are not easy to expand when the interior of a concrete matrix bears bending stress, and fibers in the additives inhibit crack expansion through a bridging effect, so that the fracture resistance of the road concrete material is also improved.

A manufacturing system for a multifunctional composite mala colored stone material, characterized in that: It comprises a raw material pretreatment module, a precision composite manufacturing module, a finished product post-treatment module, which are connected in sequence, and an intelligent control module that networks the respective modules; that the raw material pretreatment module contains an aggregate treatment unit and an auxiliary material treatment unit, for the aggregate treatment unit a link of “vibrating feed → jaw coarse crushing → cone medium crushing → VSI sand production-shaping → classification by means of a multi-deck circular vibrating screen” is used, through the classification aggregates are obtained in specifications of 30 meshes, 50 meshes, 80 meshes, 120 meshes, the auxiliary material treatment unit is equipped with an LM vertical mill and a drying-dehumidifying device;that the precise compound manufacturing module includes an intelligent dosing unit and a mixing modification unit, the intelligent feeding unit is controlled by a PLC control system networked with an electronic dosing scale, and the precision error of a proportional division is ≤ ± 0.5%.

The invention belongs to the technical field of concrete, and particularly relates to a concrete composite material for roads and bridges and a preparation method thereof. The concrete comprises the following raw materials: a cementing material system, an aggregate system, a hybrid fiber system, a stable liquid storage lightweight aggregate and an additive system, the cement, the fly ash and the silica fume are used for constructing a cementing material system, the high-strength lightweight aggregate is sucked into the composite internal curing liquid and then is subjected to surface layer liquid stabilizing treatment to obtain the liquid stabilizing type liquid storage lightweight aggregate, and the internal humidity retention capacity and the early-age shrinkage state of the concrete are improved through synergistic cooperation of all the components in the composite internal curing liquid; the steel fiber and the PVA fiber are further combined to construct a multi-scale hybrid fiber reinforcement system, and PVA fiber surface activation treatment, staged water adding wet mixing and liquid stabilizing type liquid storage lightweight aggregate rear-section low-speed adding processes are adopted, so that the fiber dispersion uniformity is improved, the early liquid loss risk of the lightweight aggregate in the mixing stage is reduced, and comprehensive improvement is achieved.

The invention relates to the technical field of concrete, and discloses a method for preparing coal gasification furnace slag concrete, which comprises the following steps of: mixing mixed fine aggregate of pebbles, sand and coal gasification furnace slag, a binding material, a composite exciting agent and water according to the total mass of 100 parts of the mixed fine aggregate of the pebbles, the sand and the coal gasification furnace slag, the binding material, the composite exciting agent and the water, and uniformly mixing the mixed fine aggregate of the pebbles, the sand and the coal gasification furnace slag, the binding material, the composite exciting agent and the water, the usage amounts of the mixed fine aggregate of the stones, the sand and the coal gasification furnace slag, the cementing material, the composite exciting agent and the water are respectively 40-45 parts, 24-40 parts, 15-22 parts, 1-5 parts and 5-10 parts, the mass of the coal gasification furnace slag is 35-65% of the mass of the mixed fine aggregate of the sand and the coal gasification furnace slag, and the composite exciting agent comprises a CaO-based early strength agent, phosphogypsum, a lithium salt and an alkali solution. The compact degree of a concrete matrix is greatly improved, so that the mechanical property and the durability index of the concrete are effectively improved, and particularly, the compressive strength and the chloride ion penetration resistance are remarkably improved.

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 invention belongs to the technical field of building materials, and particularly relates to fan blade regenerated fiber-based high-solid-waste low-carbon concrete and a preparation method thereof, and the fan blade regenerated fiber-based high-solid-waste low-carbon concrete comprises the following raw materials by weight: 0.9-1.1 parts of an alkali-activated active precursor; 0.4 to 0.8 part of iron tailing sand; 0 to 1.1 parts of natural sand; 1.9 to 2.4 parts of recycled aggregate; 0.15 to 0.20 part of a composite alkali activator; 0.015 to 0.020 part of fan blade regenerated glass fiber; 0.001 to 0.003 part of a retarder; 0.35 to 0.45 part of water; wherein the alkali-activated active precursor is granulated blast furnace slag powder. The obtained concrete mixture is good in workability, the 28-day compressive strength reaches 40 MPa or above, the drying shrinkage rate is reduced by 30%-50% compared with that of traditional alkali-activated concrete, additional curing measures are not needed, the concrete mixture is particularly suitable for prefabricated parts such as curbs, sleepers and manhole covers, and a feasible technical path is provided for high-valued and large-scale utilization of bulk industrial solid waste.

The invention belongs to the technical field of high-performance grouting materials, and particularly relates to a high-performance green cement-based grouting material and a construction method. The problems that steel fibers of an existing grouting material are prone to sedimentation, porosity caused by regenerated sand is high, and durability is poor are solved. According to the grouting material, a cementing material, modified reclaimed sand compound fine aggregate, nano SiO2 modified composite fibers and the like are used as raw materials, reclaimed sand is subjected to ball milling and dihydric phosphate soaking modification, pores are blocked, and an interface is optimized; the composite fiber is activated, coated and modified to inhibit sedimentation of the steel fiber. The obtained grouting material has the advantages of good fluidity, early strength, high strength, compactness and durability, has the advantage of solid waste utilization, and is suitable for grouting construction of prefabricated buildings and bridge sleeves.

The invention discloses a special evanescent mode casting coating for castings and a preparation method thereof, and relates to the technical field of evanescent mode casting paints.The special evanescent mode casting coating for the castings is prepared from 80-86 parts of refractory aggregate, 5-7 parts of bio-based composite binder, 2.5-4 parts of composite suspension, 0.4-0.6 part of dispersing aid and 0.3-0.4 part of coupling agent. 6 to 12 parts of deionized water; the invention discloses a preparation method of a special lost foam casting coating for castings. The method comprises the following steps: S1, premixing dry materials; s2, preparing a liquid phase; s3, mixing and dispersing; s4, performing vacuum defoaming; s5, ultrasonic treatment; and S6, quality detection. According to the lost foam casting coating special for the casting and the preparation method of the lost foam casting coating, in the preparation process, bauxite, quartz powder and bauxite are matched according to the proportion of 9: 1 and then graded in a gradient mode according to the proportion of 3: 5: 2, the coating forms a double-layer structure with a compact surface layer and a porous inner layer through gradient grading, the surface layer is resistant to sand burning and molten metal scouring, and the inner layer rapidly exhausts steam; therefore, the requirements of sand adhesion prevention, ventilation and steam exhaust are met.

This application relates to the field of building engineering technology, specifically disclosing a reinforced concrete and a reinforced steel composite concrete pile. The reinforced concrete comprises the following raw material components by weight: 346-356 parts cement, 180-200 parts mineral admixtures, 890-910 parts coarse aggregate, 821-841 parts fine aggregate, 5-25 parts shrinkage-reducing fibers, 30-45 parts expansion agent, 5.26-5.56 parts water-reducing agent, and 163-167 parts water. The addition of shrinkage-reducing fibers and expansion agent can alleviate the shrinkage of concrete when silica fume and rice husk ash are added, thereby obtaining reinforced concrete with excellent compressive strength and shrinkage resistance, which can better meet the requirements of high-rise buildings, bridges, tunnels, and other engineering projects for the shrinkage resistance and compressive strength of pile foundation structures.

This invention discloses an early-strength, high-stability road grouting repair material and its preparation, belonging to the field of solid waste utilization and road grouting reinforcement technology. The raw materials of the early-strength, high-stability road grouting repair material of this invention include multi-source solid waste aggregates and a water-reducing agent; the multi-source solid waste aggregates, by mass percentage, include: 6.6 wt% fly ash, 5-15 wt% rapid-hardening sulfoaluminate cement, 64-74 wt% mineral powder, 13.4 wt% desulfurized gypsum, and 1% carbide slag. This invention constructs a quaternary solid waste system of fly ash-desulfurized gypsum-mineral powder-carbide slag, synergistically forming a slurry composite system with rapid-hardening sulfoaluminate cement and a water-reducing agent, and precisely controls the concentration of raw materials. During hydration, this system can generate supporting crystals, which not only provide high early-stage stone strength for the road grouting material, but also, due to its good stability, ensure high stone strength stability in the later stages.

The invention discloses an inorganic nanofiber reinforced concrete composite material for a lightweight building material, and relates to the technical field of advanced inorganic non-metallic materials, the composite material is prepared from cement, lightweight aggregate, fine aggregate, modified inorganic nanofiber, a mineral admixture, a water reducer, a dispersant and water, the modified inorganic nanofibers are subjected to surface activation treatment through a silane coupling agent, the interface bonding strength with a cement matrix is improved, the preparation method comprises the steps of nanofiber surface modification, ultrasonic dispersion, dry material mixing, wet material stirring, aggregate adding and forming and curing, the dry apparent density of the prepared composite material is 1400-1600 kg / m < 3 >, the 28-day compressive strength reaches 35-45 MPa, and the composite material is suitable for being used as a cement-based composite material. The light-weight high-strength light-weight building material has the characteristics of light weight, high strength, good crack resistance and excellent durability, and is suitable for the fields of novel wall materials and light-weight building materials.

The application relates to the technical field of building materials, in particular to a full-recycled coarse aggregate and fiber composite impact-resistant concrete and a preparation process, which comprises the following components: cement 389-393 parts, river sand 785-793 parts, recycled concrete aggregate 1085-1095 parts, water reducing agent 5.863-5.867 parts, nylon fiber 1.13-1.19 parts, steel fiber 31.1-31.7 parts and tap water 160-200 parts. The full-recycled coarse aggregate is combined with the nylon fiber and the steel fiber in a specific proportion, and the dosage of the cementing material, the aggregate and the water reducing agent is optimized, so that the building solid waste is recycled, the consumption of the natural aggregate is reduced, the integrity and the toughness of the recycled concrete matrix are improved, the generation and the expansion of the micro cracks under the impact load are effectively inhibited, the defects of the traditional recycled concrete, such as the brittleness and the insufficient impact resistance, are improved, and the concrete has better compressive resistance, tensile resistance and impact resistance mechanical properties.

The invention discloses an improvement method for soluble salt in sandy soil, which comprises the following steps: S1, screening the soluble salt-containing sandy soil, separating and removing salt-containing fine particles with the particle size less than the preset particle size, and retaining coarse-particle aggregate; s2, mixing the aeolian sand with fly ash to form a composite modifier; s3, mixing the coarse particle aggregate with the composite modifier to form a uniform mixed soil body; and S4, the mixed soil body is compacted and maintained. Fine particle bodies enriched with soluble salts are removed through physical screening, then the obtained coarse particle aggregate is combined with the aeolian sand and the fly ash to react to generate a gelling substance, the aeolian sand and the coarse particle aggregate are firmly bonded, the fly ash can adsorb and fix a small amount of salt remaining on the surface of the coarse particle aggregate, and the salt content in the coarse particle aggregate is reduced. Salt migration, crystal expansion and corrosion to the structure are effectively inhibited; furthermore, the unconfined compressive strength, the shear strength and the integrity of the improved soil body are remarkably improved, so that the soil body meets the strength and stability requirements of projects such as roadbeds and base layers.

The application relates to the technical field of highway maintenance, in particular to a highway drainage ditch self-leveling mortar and a preparation method thereof. The highway drainage ditch self-leveling mortar is prepared from at least gelatinous material and 20-200 mesh graded aggregate, the mass ratio of the gelatinous material and the graded aggregate is (14-17):(9-12), and a composite reinforcing agent and a functional additive are further added. The application greatly improves the core contradiction that the self-leveling performance and the structural durability cannot be simultaneously considered in the construction of the highway drainage ditch, the prepared mortar has excellent fluidity and thixotropy in the construction, can automatically flow and evenly cover on the inclined ditch wall, effectively avoids defects caused by manual troweling, greatly improves the construction efficiency and the forming quality, and the structure formed after hardening is compact and has a self-reinforcing characteristic.

The application provides a water-permeable asphalt composition and a preparation method thereof, and the composition comprises the following components and mass fractions: 22-28 parts of base asphalt, 65-75 parts of modified composite aggregate, 3-4 parts of interface reinforcing agent, 1-2 parts of nano anti-aging agent, and 0.3-0.5 parts of antioxidant dibutyl hydroxytoluene, wherein the modified composite aggregate is compounded by basalt coarse aggregate, ceramsite fine aggregate and recycled glass microbeads at a mass ratio of 5-7:3-5:1. Through the synergistic effect of the multistage aggregate compounding system, the bio-based interface reinforcing technology and the nano drug-loaded anti-aging process, the mechanical strength and durability are significantly improved while the high water permeability is maintained, and the low-temperature modification and solid waste recycling technology are used to realize the environment-friendly and low-consumption production.

Mobile concrete mixer having a sandwiched material storage and material flow configuration, is characterized by- a mobile concrete Mixer (1) installed on a vehicle (v) having a composite bulk solid material storage compartment (2) wherein the cement or binder compartment (3) is sandwiched longitudinally between the fine and coarse aggregate compartments (4 & 5) having inclined conveyors (6, 7 & 8) respectively wherein the Mixer (9) is divided into two sides (A & B) by the longitudinal axis of the vehicle and the binder or cement is discharged in the mixer at the center with water while the fine and coarse materials on opposite sides of the Mixer (9). The Mixing is achieved by means of plurality of mixing blades (11) which push 'Side A' material to 'Side B' and vice a versa before discharging the fresh mixed concrete through a central discharge gate (14).