Air Content Optimization in Self Compacting Concrete

High fluidity self-compacting concrete for filling slab ballastless track in high-speed rail applications. The concrete has improved flowability, segregation resistance, and steel bar penetration compared to standard self-compacting concrete. It allows pouring without vibration into narrow cavities with obstructions. The concrete composition includes optimized ratios of cement, fly ash, silica fume, expansion agent, sand, coarse aggregate, water reducer, and sensitivity modifier.

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A novel concrete formulation incorporating Turitella, a naturally occurring, high-strength aggregate, to enhance its performance in self-compacting concrete. The Turitella material, which naturally forms a protective layer on aggregate surfaces, is added to concrete mixtures to improve workability, reduce segregation, and enhance durability. The formulation combines the benefits of Turitella with conventional cement to create a self-compacting concrete that can be pumped and compacted without vibration, while maintaining superior workability and homogeneity.

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Self-compacting concrete for bridge construction that improves durability and maintenance resistance through enhanced fiber reinforcement. The innovative concrete formulation combines fly ash, slag, and silicon micropowder with a surface treatment agent to improve fiber bonding and reduce fiber degradation. The treatment agent forms a protective coating on the fiber surface, enhancing its performance in self-compacting concrete while preventing fiber degradation. This formulation enables bridge decks to maintain their structural integrity even under harsh environmental conditions, reducing maintenance requirements and improving overall bridge performance.

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A green, energy-saving self-compacting high-strength concrete mixture that enhances its self-compactability through a novel combination of raw materials. The mixture incorporates a specialized defoaming agent, microfiller, and low-thermal gelling agent that work synergistically to improve the concrete's self-compaction properties, particularly in high-viscosity mixtures. This combination enables the concrete to maintain its self-compactability even in dense aggregate mixtures, reducing the formation of surface defects and pockmarks. The defoaming agent and microfiller enhance the concrete's ability to remove internal air bubbles, while the low-thermal gelling agent facilitates the setting process. The resulting mixture offers improved self-compaction characteristics, reduced surface defects, and enhanced durability compared to conventional self-compacting concrete mixtures.

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Self-compacting concrete with enhanced properties for construction applications. The concrete comprises a cement-based matrix with 45% carbon fibers, fly ash, mineral powder, and a proprietary expansion agent. The matrix is prepared by hydration reaction of cement, fly ash, and mineral powder, followed by addition of crushed stone and water. The resulting self-compacting concrete achieves improved workability and reduced vibration requirements compared to conventional mixes, while maintaining superior compressive strength and durability.

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Self-compacting concrete with low shrinkage and ultra-high strength achieved through a novel preparation process. The concrete composition includes Portland cement, silica fume, mineral powder, fly ash, stone, steel fiber, calcium carbonate whiskers, inorganic gelling agent, water-reducing agent, and hydroxyethyl cellulose. The preparation involves ultrasonic dispersion of the cement components, followed by specific mixing and stirring parameters to optimize concrete properties. The concrete exhibits improved workability, volume stability, and compressive strength compared to conventional self-compacting concrete.

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Self-compacting concrete with improved workability and durability through a novel admixture system. The concrete combines cement, polyacrylamide, sand, crushed stone, iron slag, sodium pyrophosphate, fly ash, mineral powder, and admixtures with specific additives. The formulation provides enhanced workability and resistance to vibration-induced defects, while maintaining high compressive strength.

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Self-compacting concrete with improved fluidity and segregation resistance, achieved through the use of machine-made sand in place of natural river sand. The concrete composition includes a combination of mineral powder and polysilicon powder, with specific weight proportions. The polysilicon powder enhances the concrete's mechanical properties while the mineral powder improves its flow characteristics. This innovative combination enables the production of self-compacting concrete that meets stringent environmental standards while maintaining superior workability compared to conventional self-compacting concrete.

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High-strength ultra-high pumping self-compacting concrete with enhanced workability and pumping performance. The concrete combines a dense and stable cement matrix with specialized admixtures, superplasticizer, and additives to achieve rapid pumping while maintaining excellent flow characteristics. The formulation enables self-compacting concrete that fills formwork without vibration, with superior segregation resistance and homogeneity. This enables efficient construction of large spans and high-rise buildings through reduced water requirements and enhanced pumping efficiency.

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C100 self-compacting ultra-high performance concrete with enhanced self-compaction properties and improved durability. The concrete combines a cement matrix with specialized additives to achieve a 28-day curing compressive strength of C100, while maintaining the self-compacting characteristics of traditional ultra-high performance concrete. The formulation includes a cement matrix with a specific ratio of cement, viscosity modifier, mineral powder, silica fume, expansion agent, sand, crushed stone, water-reducing agent, water, and steel fibers. The additives enhance the concrete's self-compaction properties while controlling shrinkage and cracking. The preparation method involves precise component selection and controlled mixing to produce the desired concrete properties.

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A self-compacting concrete pouring device that eliminates air bubbles in the poured concrete by incorporating a unique distribution system. The device comprises a self-compacting concrete reservoir, a diversion pipe, a speed regulating valve, a self-compacting concrete distribution pipe, a slurry pipe, a template, a template layered hole, a plug, a steel cage, concrete mixing plant and concrete transportation pipe. The distribution pipe penetrates into the formwork during concrete pouring and distributes slurry to the concrete, preventing air entrainment and ensuring uniform distribution.

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Self-compacting concrete admixture with improved flowability and self-compactability through enhanced cement stabilization. The admixture combines a water-reducing component with a stabilizing agent to prevent premature cement expansion, while incorporating a dispersing agent to enhance ultrafine powder dispersion. The composition includes a water-reducing component with a specific molecular weight, a stabilizing agent, a dispersing agent, an anti-segregation agent, a defoaming agent, and a dispersing agent. The stabilizing agent prevents early cement expansion, while the dispersing agent improves ultrafine powder dispersion. The anti-segregation agent and defoaming agent contribute to maintaining consistent cement particle distribution. The composition achieves improved self-compactability and flowability through enhanced cement stabilization, enabling efficient and controlled concrete pouring.

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Designing self-compacting concrete mix for high-speed railway ballastless track structures that meets stability requirements through optimized mix composition. The method involves analyzing the relationship between self-compacting concrete stability and its constituent properties, specifically the water reducing agent content, to determine the optimal mix design parameters. This approach enables the creation of self-compacting concrete mixes that meet the stringent requirements of CRTS-type ballastless track structures, particularly in high-speed railway applications where precise control of the filling layer is critical for track stability and durability.

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Self-compacting concrete formulation and preparation method for improved fluidity and durability in construction applications. The formulation includes cement, crushed stone, medium sand, water, air-entraining agent, and stone powder, with specific weight percentages ranging from 20.04% to 20.45% cement, 45.14% to 45.54% crushed stone, 26.11% to 26.52% medium sand, 5.87% to 6.28% water, 0.43% to 0.47% air-entraining agent, and 1.42% to 1.82% stone powder. The formulation is optimized to achieve the desired rheological properties for self-compacting concrete while minimizing the need for supplementary materials.

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Self-compacting C120 ready-mixed dry concrete that can be mixed with water to produce high-performance concrete for construction applications. The dry concrete contains a specially formulated blend of cement, silica fume, and steel fibers that can be stored and transported in a dry state. The dry concrete can be mixed with water at the construction site to produce a high-strength concrete that can be pumped and placed using conventional construction equipment. The dry concrete contains a blend of Portland cement and silica fume that provides high early strength and durability, while the steel fibers provide enhanced tensile strength and resistance to cracking. The dry concrete can be mixed with water at a 1:1 ratio to produce a high-strength concrete that can be pumped and placed using conventional construction equipment.

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High-fluidity concrete with enhanced self-filling properties. The concrete achieves this through a specific compounding process that balances air content with the amount of fine aggregate. The process involves determining the optimal air volume within the paste to achieve the desired self-filling behavior while maintaining sufficient strength. This approach ensures the concrete meets the Japan Society of Civil Engineers' criteria for high-fluidity concrete, with a self-filling property ranked 1. The specific compounding parameters include a fine aggregate content of 800 kg/m3 and a paste air volume of 12% or more.

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A self-compacting concrete formula and preparation method that addresses the limitations of conventional C40 concrete formulations. The method improves the flowability and densification characteristics of C40 concrete by optimizing the ratio of cement, fly ash, and aggregate. The process involves a specific sequence of mixing steps that incorporates the aggregate, cement, and admixtures in a controlled order, followed by a sequence of water additions and mixing cycles. This approach enables the production of self-compacting concrete with improved flow characteristics and reduced vibration requirements.

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Self-compacting concrete with enhanced workability for high-rise structures. The invention involves a novel C70 self-compacting concrete formulation that combines a high-performance superplasticizer with a specialized antifoaming agent. The superplasticizer enhances workability while the antifoaming agent prevents foam formation, allowing the concrete to flow and compact more efficiently. This combination provides superior workability and self-compaction characteristics in high-rise construction applications.

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High-flow self-compacting concrete for vibration-free construction in complex tunnel structures, particularly for acoustic wind tunnels. The innovative concrete formulation combines machine-made sand with ultra-fine sand to achieve improved flow characteristics while maintaining segregation resistance. This formulation enables vibration-free construction in thin wall sections with dense steel reinforcement, while controlling concrete bleeding and improving workability.

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Self-compacting concrete for building construction that eliminates the need for vibration during pouring. The concrete combines Portland, sulphur-aluminum, and gypsum cements with supplementary materials like silica fume, sand, and fly ash. The mixture is thoroughly mixed and then water is added to achieve the desired consistency. The prepared concrete is then cast into complex shapes without the need for vibration tools, enabling faster and more efficient construction while reducing labor and environmental impact.

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