21 results about "Mix design" patented technology

This invention discloses a concrete mix design and manufacturing method for underground engineering concrete in a coupled environment of underground environment and load, relating to the field of underground engineering concrete technology. It aims to address the problem that traditional concrete mix design does not fully consider the coupling effect of underground environment and load. The underground environment includes groundwater erosion, wet-dry cycle, and temperature fluctuation; the load includes stress ratio. α s Dynamic load frequency and dynamic load amplitude α d This leads to technical problems such as insufficient erosion resistance, crack resistance, and mechanical stability of concrete, resulting in a short service life. This mix design is based on quantitative analysis of coupled environmental parameters. With cement, composite admixtures, recycled aggregates, modifiers, water, and additives as core components, the basic mix proportion is determined through a mapping model between "environment-load" coupled parameters and component content. The target mix proportion is then obtained through orthogonal experimental optimization. The manufacturing method includes four core steps: raw material pretreatment, graded mixing, gradient curing, and coupled environmental simulation curing.

This invention discloses an intelligent design and preparation method for low-cement-content sprayable engineering cement-based low-carbon composite materials, belonging to the field of composite material mix design. The method includes: constructing a multi-objective genetic optimization intelligent framework integrating raw material performance and carbon emission data to collaboratively optimize mechanical properties, workability, and low-carbon targets during the design phase, achieving precise pre-control of carbon emissions. A synergistic reinforcement design using recycled PE fiber networks and multi-microporous slurry is employed, replacing cement and natural aggregates with a large amount of recycled sand, recycled micropowder, and fly ash, reducing cement content to 210-300 parts. While ensuring rapid hardening, high toughness, and good sprayable construction performance, the material's implicit carbon emissions are significantly reduced. The resulting composite material achieves a 28-day compressive strength of 50-65 MPa, with net carbon emissions approaching zero, making it suitable for green building and rapid engineering repair applications.

This invention discloses a high-crack-resistant cement-fly ash stabilized base course material, belonging to the field of road engineering technology. The material comprises the following components by mass percentage: 2.0-3.0% cement, 16-20% fly ash, and the balance being stabilized aggregate. The cement is an external admixture, the fly ash is an internal admixture, and the gradation of the stabilized aggregate conforms to the specifications of CF-A-2L or CF-A-2S in JTG / T F20-2015. This invention, by adopting a "low cement, high fly ash" mix design, controls the 7-day unconfined compressive strength within a reasonable range of 3.5-4.5 MPa, effectively avoiding the problem of regular transverse cracks in the base course caused by excessively high early strength. Simultaneously, the high fly ash content ensures the continuous growth of the material's later strength, with its 21-day unconfined compressive strength remaining stable above 6 MPa. Its overall performance is superior to the mix ratios recommended by current standards. This invention is particularly suitable for highway base course construction in arid regions with large temperature differences, such as Xinjiang.

This application discloses a density-based mix design method for fluidized solidified soil, comprising: determining the design density of the fluidized solidified soil; determining the water-to-solid ratio of the fluidized solidified soil based on fluidity requirements; determining the cement admixture ratio and curing agent admixture ratio of the fluidized solidified soil based on strength requirements; and obtaining the corresponding dosages of water, cement, curing agent, and wet soil. This application innovatively designs the mix proportion of fluidized solidified soil from a density perspective, effectively ensuring the rationality and accuracy of the density of the prepared fluidized solidified soil. This results in a density lower than that of the silt on the seabed in marine reclamation projects, thereby guaranteeing the construction quality of fluidized solidified soil reclamation projects.

This invention provides a method and system for controlling the stability of steel slag aggregate, belonging to the technical field of steel slag aggregate stability control. The method determines the degree of specimen damage under different combinations of maximum steel slag particle size and dosage through autoclaving accelerated testing. The degree of damage is quantified into a continuous stability index according to a preset grading standard. A quadratic polynomial regression model is established between the stability index and the maximum steel slag particle size and dosage, which also includes interaction terms for particle size and dosage. Based on the model and a preset engineering acceptable threshold, the maximum safe dosage or maximum allowable particle size of steel slag that meets the threshold requirement is calculated. The mix design of road base materials is then performed based on the calculation results. This invention achieves continuous quantitative characterization of the influence of steel slag particle size and dosage on stability, overcoming the shortcomings of existing technologies that rely on single-factor empirical limits and lack engineering back-calculation methods. It can improve the resource utilization rate of steel slag while ensuring stability.

This invention relates to a SCC mix design method and system based on the shear strength theory of cement paste. Its core lies in establishing a cement paste shear strength prediction model. This model quantitatively evaluates the shear strength of the cement paste under a proposed mix proportion and compares it with a pre-determined reasonable range. Then, through iterative adjustments to the cementitious material composition and water-cement ratio, the shear strength of the cement paste falls within the target range, thereby simultaneously optimizing the paste rheology and determining the final mix proportion. This invention achieves complete quantitative design from aggregate to paste, economically and efficiently preventing SCC segregation and maximizing the use of auxiliary cementitious materials to reduce the cost of self-compacting concrete.

This invention relates to a method for producing high crack-resistant concrete, comprising the following steps: Step S1: Raw material preparation, selecting low-heat hydration cementitious materials, continuously graded aggregates, high-performance water-reducing agents, and crack-resistant functional components; Step S2: Mix design, based on 60-day or 90-day strength design indicators, controlling the water-cement ratio ≤0.3, and the total replacement rate of mineral admixtures in the cementitious materials is 35%-40%; Step S3: Mixing, using a combination of step-by-step feeding and heating and stirring, the crack-resistant functional components and cementitious materials are heated and stirred at 85°C for 30-50 minutes for activation treatment, followed by the addition of aggregates, water, and water-reducing agents and stirring until homogeneous; Step S4: Temperature control and transportation, controlling the concrete placement temperature to not exceed 32°C. The crack-resistant components of this invention can generate expansive products such as ettringite during hydration, compensating for the chemical shrinkage, drying shrinkage, and temperature shrinkage of concrete, achieving an active crack-resistant mechanism of "compensating for shrinkage with expansion."

This utility model discloses an air content measuring instrument for concrete mix design, including a loading assembly. The loading assembly includes a measuring bowl, inside which a mixing assembly is installed. A measuring assembly and a sealing assembly are installed on the top of the measuring bowl. The measuring assembly includes a bowl cover that is fixedly and movably installed on the top of the measuring bowl. Through the setting of the sealing assembly, this utility model utilizes the connection relationship between the support frame, fixing ring, screw, moving block, four sets of rotating seats, four sets of connecting rods, four sets of clamping blocks, and four sets of clamping grooves. Rotating the screw clockwise or counterclockwise indirectly drives the four sets of clamping blocks to move closer or further apart. When they move closer, the V-shaped clamping grooves on the inner side of the four sets of clamping blocks clamp and fix the measuring bowl and bowl cover. When they move further apart, the V-shaped clamping grooves on the inner side of the four sets of clamping blocks release the clamping and fixing of the measuring bowl and bowl cover. This achieves the effect of controlling the opening and closing of the bowl cover by rotating the screw alone, thereby improving the efficiency of the air content measuring instrument.

A method for designing mix proportions of high-slump ready-mixed concrete for roads based on fillability is disclosed, relating to the field of road construction. This method involves determining the permissible values ​​of concrete spread and slump time in an inverted slump cone; conducting trial mix design for the concrete pavement; calculating the standard values ​​of concrete spread and slump time in an inverted slump cone respectively; calculating temperature correction coefficients and transport time correction coefficients and adjusting the standard values ​​of spread and slump time in an inverted slump cone to obtain design values; and determining whether the design values ​​of concrete spread and slump time in an inverted slump cone simultaneously meet the permissible values ​​of both. This method can predict and ensure that the fillability of the prepared concrete meets construction requirements during the concrete mix design stage, thereby guaranteeing concrete quality.

This invention discloses a basalt fiber-reinforced seawater sand concrete, its preparation method, and its application, belonging to the field of building materials technology. The basalt fiber-reinforced seawater sand concrete, by weight, consists of the following components: 35-45 parts cement, 65-75 parts sea sand, 105-120 parts crushed stone, 15-20 parts seawater, 0.1-0.3 parts water-reducing agent, and 0.1-1 parts basalt fiber. Based on the selection of raw materials and mix design to improve the toughness and crack resistance of traditional concrete, SEM results show that the addition of basalt fiber to seawater sand concrete bridges cracks and improves pore connectivity, which is beneficial for improving crack resistance, toughness, salt and alkali resistance, and residual mechanical properties after high temperatures. It can be used for the repair of shield tunnel segments, FRP concrete structures, and existing structures in marine environments.

This invention relates to the field of concrete mix design technology, providing a method and system for dual-verification risk early warning of concrete mix proportions. One method includes the following steps: S1: Constructing a rule engine library to convert key control indicators in concrete mix design specifications into programmable logic rules; S2: Constructing an engineering practice data benchmark library to collect successful mix proportion data for each strength grade of completed projects, and establishing the mean, standard deviation, and reasonable range of key parameters for each strength grade through statistical analysis; S3: Obtaining the concrete mix proportion parameters to be verified, and performing rule verification and data verification in parallel. This invention combines regulatory constraints with engineering practice experience, enabling proactive risk identification and intelligent optimization during the mix design stage. This effectively avoids rework and quality hazards caused by delayed risk assessment in traditional methods, improving project quality and safety.

The application discloses a multi-objective intelligent optimization method for solid waste concrete mix proportion design, and relates to the field of building material engineering and intelligent optimization technology.The method obtains a concrete performance prediction distribution by constructing an uncertainty transmission model from solid waste raw material performance fluctuation characteristic spectrum and mix proportion parameters to concrete performance, and constructs a performance toughness index accordingly.On this basis, a dynamic mapping relationship between a nominal solution space and a toughness solution space is established, a multi-objective toughness equilibrium optimization model in the toughness solution space is formed, and a toughness Pareto frontier is output based on a performance toughness dominance relationship.Furthermore, a final mix proportion scheme is selected from the toughness Pareto frontier, and a corresponding raw material entry performance control interval is generated, so that the unity of solid waste concrete mix proportion design and engineering quality control is realized.

This invention discloses a mix design method for wet-mix shotcrete based on the control of the slurry film thickness. It relates to the field of wet-mix shotcrete technology for underground hydraulic caverns and includes the following steps: S1, selecting or preparing stone powder, micro-stone powder with a particle size of less than 0.08 mm, and artificial sand; S2, selecting low-density submicron silica; S3, incorporating the micro-stone powder with a particle size of less than 0.08 mm, the low-density submicron silica, and cement into the slurry film layer, and determining the target values ​​tp,targ for the slurry film thickness covering the aggregate surface. This invention solves the quantitative design problem of suitable slurry volume for wet-mix shotcrete that matches aggregate particle size, gradation, and dosage; and "slurry film thickness" replaces "slump" as a quantitative characterization of the effective volume of the slurry, further quantifying the impact of aggregate particle size, gradation, and dosage on the effective volume of the slurry. The slurry film thickness can better characterize the pumping and spraying performance of concrete.

This invention provides a collaborative calculation method for dry desulfurized phosphogypsum in aerated concrete, relating to the field of building material mix design technology. It aims to overcome the blindness and uncertainty of existing technologies that rely on experience to determine the dosage of dry desulfurized phosphogypsum. This method, by quantitatively controlling the molar ratio of sulfur and aluminum, can avoid the risk of delayed ettringite formation from the source and provides a universal dosage design guideline for different aerated concrete systems (sand-aerated, ash-aerated, and slag-aerated). This method is a quantitative design method for accurately determining the safe and reasonable dosage of industrial solid waste "dry desulfurized phosphogypsum" in the industrial production of autoclaved aerated concrete (AAC), and is particularly suitable for AAC systems using sand or fly ash as siliceous materials.

This specification discloses a method and system for proportioning recycled asphalt mixtures based on energy characteristics. The proportioning method includes: obtaining the value ranges of the asphalt-aggregate ratio, the amount of recycling agent, and the gradation parameters according to the set dosage of the recycled asphalt mixture; preparing multiple sets of recycled asphalt mixture specimens with different parameter combinations based on the value ranges; conducting low-temperature performance, water stability performance, and fatigue performance tests on each set of recycled asphalt mixture specimens to obtain their respective performance response results; performing energy characterization based on the performance response results to obtain their respective energy state vectors; and obtaining the recommended value ranges for the asphalt-aggregate ratio, the amount of recycling agent, and the gradation parameters based on the energy state vectors. This invention reveals the intrinsic mechanism of multi-performance synergistic optimization of recycled asphalt mixtures through energy coupling analysis, avoiding proportioning design deviations and providing a new technical path for the mix design of recycled asphalt mixtures.

This invention provides a method for fabricating precast box girder tracks for highways, belonging to the field of track fabrication technology. The method includes the following steps: S1: Concrete preparation, where screened cement, crushed stone, and sand are mixed according to a concrete mix design to obtain castable concrete; S2: Steel frame preparation, where steel bars and prestressed steel strands are combined after ensuring the materials are qualified to obtain a precast steel frame; S3: Concrete pouring, where the concrete pouring equipment includes a steel frame conveying mechanism for positioning and conveying the steel frame, a pouring mold for placing the steel frame for positioning and pouring, a demolding mechanism for quickly demolding the formed precast beam, and a moving pouring mechanism for uniform pouring; S4: Demolding and curing, where the precast beam is cured using curing equipment, ensuring that after the concrete pouring is completed and the slurry has settled, it is covered and watered for curing as soon as possible; S5: Finishing work. This invention facilitates rapid demolding of precast beams, achieving efficient demolding.

This invention discloses a method for evaluating the interfacial reinforcement of ultra-high performance concrete using limestone powder as a substitute for silica fume, belonging to the technical field of cementitious composite material mix design and performance evaluation. The invention first establishes a reference cementitious material matrix system containing silica fume and sets up gradient substitution groups for silica fume using limestone powder. The strength of specimens with different substitution ratios is pre-screened based on the 28-day matrix compressive strength, selecting representative substitution groups. The 100-hour cumulative heat release, 28-day total porosity, peak pull-out load of a single steel fiber, and pull-out work of a single fiber are measured for the representative substitution groups. Hydration response coefficient, pore structure compactness coefficient, peak bearing capacity coefficient, and energy dissipation coefficient are constructed, and a coupled determination method of interfacial reinforcement index (IEI) and strength constraint coefficient (Kc) is established. Based on IEI and Kc, candidate reinforcement groups, optimal substitution groups, and corresponding substitution ratios are output. This invention can be used for the rapid screening and quantitative design of low-silica fume ultra-high performance concrete cementitious systems.

A method is provided for determining a mix proportion of an alkali activated concrete, AAC, mixture for a set of desired physical properties of the AAC, and for a dry bulk volume of one or more coarse aggregates and a fine aggregate per unit volume of AAC. The method includes determining (202) a mix proportion of an alkali activated paste, AAP, mixture from the set of desired physical properties of the AAC based on a predetermined relationship (210) between the set of desired physical properties of the AAC and the mix proportion of the AAP mixture. The AAP mixture has one or more precursors, one or more chemical compounds of an alkali activator, and water according to the determined mix proportion of the AAP. The method further includes determining (203) masses (261, 262) of the respective one or more coarse aggregates per unit volume of AAC and a mass (263) of the fine aggregate per unit volume of AAC by packing (230, 240, 250) particles of the respective aggregates (231, 241, 251) within the dry bulk volume (234) according to a particle packing model. The method further includes determining (204) a mass of the AAP mixture per unit volume of AAC to complete a remaining volume within the unit volume.

This application relates to the field of concrete materials engineering technology, specifically disclosing a method for concrete mix design and optimization based on rheology, including the following steps: Preliminary mix design: Based on the concrete workability requirements, a preliminary concrete mix design is performed using a quantitative model established between concrete mix proportion parameters and conventional workability indicators; Real-time monitoring of rheological parameters: After the concrete mix proportion is initially determined, the concrete rheological parameters are monitored in real time; Mix proportion adjustment: By using the monitored concrete rheological parameter data and combining it with the quantitative model between the concrete mix proportion parameters and rheological parameters, the concrete mix proportion parameters are adjusted to ensure that the concrete rheological properties and conventional workability meet construction requirements. This invention integrates rheological principles into concrete mix design, and the scientific design and dynamic optimization of the mix proportion ensures the quality of concrete construction, reduces trial mixing costs and design cycles, and is applicable to modern concrete engineering.

This invention discloses a red mud-based concrete retaining wall and its construction process, comprising the following steps: S1, pretreatment and performance analysis of red mud materials; S2, composite modification treatment of red mud materials, employing a synergistic modification technology of curing agent doping, mineral admixture, and surface-active treatment to optimize its mechanical properties and durability; S3, mix design and preparation of red mud-based concrete, determining a mix proportion that meets the strength requirement of C20 or higher based on modified red mud, cementitious materials, aggregates, admixtures, and water; S4, foundation trench treatment and formwork support for the retaining wall; S5, mixing, transportation, and pouring of red mud-based concrete; S6, concrete vibration, finishing, and curing; S7, formwork removal and backfilling behind the wall. This invention also provides a red mud-based concrete retaining wall produced by this process. This invention effectively solves the environmental pressure of red mud storage, reduces engineering costs, improves resource utilization, and has significant economic, social, and environmental benefits.