Ultra High Performance Concrete Formulations

Early-strength and ultra-high performance concrete (UHPC) with enhanced durability and resistance to environmental degradation. The UHPC combines a significant amount of red mud with other conventional components like silica fume, cement, and steel fibers. The red mud replaces up to 40% of the original cement, achieving improved early strength and rapid setting characteristics. The UHPC maintains excellent mechanical properties and durability despite the high red mud content, while meeting stringent environmental and safety standards for radioactivity and leachability.

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Modified slag sulphoaluminate cement-based ultra-high performance concrete with enhanced durability and reduced environmental impact. The composition includes a controlled amount of sulphoaluminate cement, ordinary Portland cement, activated blast furnace slag, anhydrite, quartz sand, nano alumina, rare earth polycarboxylic acid water reducer, and nano SiO2. The addition of a water-reducing agent and nano SiO2 enhances the concrete's mechanical properties while maintaining its hydration characteristics. The modified composition addresses the challenges associated with traditional UHPC production, including high cement content and environmental concerns.

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Ultra-high performance concrete (UHPC) with enhanced mechanical properties achieved through a novel composition and preparation approach. The material combines a high-strength cement matrix with supplementary materials that enhance matrix density, improve crack resistance, and optimize pore structure. The composition includes nano-silicon dioxide, fly ash, and microbeads, which are precisely controlled to achieve optimal performance while minimizing environmental impact. The material is prepared through a multi-step process that includes mixing the nano-silicon dioxide with fine aggregate, combining with cementitious material, and incorporating steel fibers. The curing sequence includes standard, steam, and dry heat curing to achieve the desired mechanical properties.

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High-performance concrete with enhanced durability and resistance to bending and cracking, achieved through a novel preparation process that integrates fly ash, mineral powder, and silica fume into a dense cementitious matrix. The process involves sequential addition of these components to the cement, aggregate, and water mixture, followed by specific mixing and curing conditions. This approach enables the creation of a concrete with superior mechanical properties and reduced cracking potential, while maintaining excellent workability and processability.

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High-strength concrete with improved workability and flow characteristics. The concrete achieves enhanced workability and flow properties through a novel approach that balances the water-to-binder ratio to optimize the concrete's fluidity and workability. The novel ratio is between 140-180 kg/m³, which enables the concrete to achieve a higher compressive strength while maintaining optimal workability. This approach enables the production of high-strength concrete with improved flow characteristics, enabling more efficient construction processes.

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Ultra High Performance Concrete (UHPC) with improved physical properties, incorporating fly ash as a cement replacement. The UHPC formulation combines cement, fly ash, silica sand, silica fine powder, a high-performance chemical admixture, and water, achieving enhanced mechanical properties while maintaining homogeneity and fluidity. The fly ash enhances cement hydration and pozzolanic reaction mechanisms, while the chemical admixture ensures optimal processability. This innovative UHPC formulation addresses the challenges of early-age strength, durability, and carbonation resistance in conventional concrete while maintaining economic and environmental benefits.

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High-strength concrete with reduced cement content that achieves ultra-high compressive strength through optimized mineral powder blend. The concrete contains less than 500 kg/m3 cement, with fine aggregates and mineral powder having diameters below 150 pm. The mineral powder, comprising granite or marble particles with diameters greater than 5% above the cement particle size, is mixed with water and superplasticizer to form a concrete with compressive strength of at least 55 MPa after 28 days. The cement content is maintained below 470 kg/m3 while achieving this exceptional strength.

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Ultra-high-strength concrete with enhanced mechanical properties achieved through a simplified manufacturing process that eliminates traditional water absorption steps. The cement composition combines a low-heat Portland cement with ultrafine silica fume, inorganic powder, and lightweight aggregate B. The lightweight aggregate, which has a saturated water absorption rate of 15% or more, is added to the cement composition. This combination enables the production of ultra-high-strength concrete with reduced shrinkage strain while maintaining compressive strength. The process involves a normal curing step, a heat curing step, and a high-temperature drying step.

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Machine-made sand ultra-high performance concrete with enhanced compressive strength and improved workability. The concrete combines cement, silica fume, machine-made sand, ground limestone powder, steel fibers, and water-reducing agent in a specific ratio. The machine-made sand is prepared using a unique crushing and screening process that produces a sand with a particle size distribution of 1.18-2.36mm, with no particles smaller than 0.15mm or larger than 0.6mm. This sand has a particle diameter greater than 2.36mm and a weight ratio of 1.18-2.36mm. The resulting concrete exhibits superior compressive strength above 180 MPa, while maintaining excellent workability.

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Ultra-high performance concrete (UHPC) for bridge expansion joints that combines enhanced mechanical properties with improved durability. The UHPC formulation incorporates a cementitious material system that enables rapid hardening and early strength, while controlling the hydration reaction to optimize performance. The system achieves exceptional compressive and flexural strengths, with enhanced impact resistance and durability compared to conventional concrete. The UHPC formulation is prepared using a cement compounding system that incorporates a water-reducing agent to minimize water consumption while maintaining optimal hydration properties. The resulting material offers superior performance characteristics for bridge expansion joints, particularly under high-impact conditions.

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Low-shrinkage, low-viscosity, ultra-high-strength concrete with improved workability. The concrete comprises a composite aqueous solution of lithium silicate and sodium silicate, wherein the lithium silicate is obtained from waste ceramics. The solution is prepared by grinding waste ceramics into a fine powder and mixing it with water to form a homogeneous solution. This solution provides excellent workability characteristics, including good slump and pumpability, while maintaining the high strength and durability of ultra-high-strength concrete.

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A low-heat and low-shrinkage ultra-high performance concrete (UHPC) that achieves enhanced mechanical properties and durability through innovative composition and processing. The UHPC formulation combines a high cement content with specialized additives, including a magnesium composite expansive agent, silica fume, and ultrafine quartz particles. This composition enables the material to exhibit superior mechanical performance while minimizing thermal expansion and shrinkage. The formulation is optimized through advanced mix design and testing, resulting in a concrete with reduced hydration heat and shrinkage compared to conventional UHPC.

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High-strength concrete preparation method that enhances compressive strength through the addition of environmentally friendly polysodic acid-based water-reducing agents. The method incorporates cement, coarse aggregate, fine aggregate, fly ash, silica fume, superfine slag, engineering fibers, calcium chloride/sodium nitrite compound agents, water-reducing agents, and water to achieve significantly improved compressive strength.

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Normal temperature and pressure curing ultra-high performance concrete and a preparation method for achieving this type of concrete. The method enables the production of ultra-high performance concrete through a controlled curing process that combines normal temperature and pressure curing techniques. The concrete achieves high strength and durability characteristics while maintaining practical engineering requirements.

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A composite cementitious material system for ultra-high performance concrete that enables the production of green concrete while maintaining its exceptional mechanical properties. The system combines cement, active mineral admixtures, and a sodium sulfate-based chemical activator in a molar ratio of 0.8-0.91:1. This composition enables the replacement of traditional cement with mineral admixtures while maintaining the material's high performance characteristics, including compressive strength, toughness, and durability. The sodium sulfate activator provides superior workability compared to conventional activators, making it an ideal choice for green concrete production.

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Ultra-high performance concrete (UHPC) with enhanced mechanical properties, particularly in high-temperature environments, achieved through a novel reinforcement approach. The UHPC formulation combines ultra-fine steel fibers with a specially optimized reinforcement matrix, allowing superior compressive, tensile, and flexural performance compared to conventional UHPC. The reinforcement matrix is created through a controlled fiber distribution process that ensures optimal fiber-matrix interaction and mechanical bonding. This matrix-based reinforcement system enables improved mechanical properties and durability in challenging environments.

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Low-shrinkage ultra-high performance concrete (UHPC) with improved durability through reduced early shrinkage. The UHPC formulation combines a high-performance cement with an ultra-fine silica fume admixture, which significantly reduces the conventional shrinkage of UHPC while maintaining its high strength and durability. The preparation method involves optimizing the cement-binder ratio and incorporating specialized additives that enhance the concrete's early strength and resistance to cracking, while maintaining its long-term performance.

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High-performance concrete for structural applications that combines enhanced mechanical properties with improved durability. The method involves the controlled incorporation of advanced reinforcement materials, such as high-strength steel fibers or ultra-high-performance fibers, into a conventional concrete matrix. The reinforcement is added through a series of controlled additions, allowing for precise control over fiber distribution and orientation. This approach enables the creation of high-performance concrete with superior mechanical properties, including enhanced toughness and resistance to chloride ion penetration, while maintaining optimal workability and flow characteristics.

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A method for preparing high-performance concrete using silica fume that addresses conventional issues of high-strength concrete. The method combines cement, slag powder, fly ash, and silica fume in specific ratios to produce a concrete with improved workability, reduced segregation, and enhanced pumping characteristics. The concrete composition includes 300-330 parts of cement, 100-115 parts of slag powder, 40-45 parts of fly ash, 20-35 parts of silica fume, 643-683 parts of sand, 1063-1103 parts of crushed stone, 8.4-10.6 parts of water-reducing agent, and 155-168 parts of water. The precise formulation enables the production of high-performance concrete with enhanced workability and reduced pumping resistance.

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Ultra-high performance concrete with enhanced mechanical properties for hollow components. The concrete formulation includes cement, silica fume, coarse and fine sands, steel fibers, water, and admixtures. The cement content ranges from 30% to 45%, while the silica fume content is between 5% and 15%. The coarse and fine sands contribute to the structural integrity, while steel fibers provide added strength. The water content is between 6% and 15%. The admixture level is between 0.2% and 1%. This formulation enables the production of hollow components with improved mechanical properties compared to conventional ultra-high performance concrete, particularly for applications requiring enhanced aesthetic and structural performance.

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