Concrete Setting Time Control Technologies

A cement-based concrete that rapidly hardens to achieve rapid repair of cracked concrete structures. The concrete composition combines Portland cement, aggregate, polymer emulsion, admixture, hydrophilic modified basalt fiber, metakaolin, calcium stearate, filler, and water. The basalt fiber is surface-modified with a hydroxyl group-containing silane compound, enhancing its bonding properties. The composition exhibits ultra-fast setting characteristics, enabling rapid hardening to repair cracks in concrete structures.

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A super slow setting concrete and a super retarder for preparing super slow setting concrete, which enables ultra-long setting times while maintaining sufficient strength. The super retarder comprises a mixture of Ca(OH)2 and Al2(SO4)3 powders, which increases the Ca2+ and SO42- ion concentration in the pore solution, thereby inhibiting early hydration reactions. The retarder is combined with a water-reducing agent that enhances the absorption of water around cementitious particles, delaying initial hydration reactions while promoting later hydration. This combination enables the concrete to achieve extended setting times while maintaining mechanical strength.

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Concrete composition that maintains workability and durability while achieving early strength, particularly in emergency construction applications. The composition comprises cement, aggregate, blast furnace slag, fly ash, and nanosilicate powder. The nanosilicate powder enhances early strength through its reaction with cement, while the sodium benzoate component prevents the undesirable side reactions associated with carbonyl diamide. This combination ensures improved workability and durability while maintaining the desired early strength.

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Concrete construction method that enables simultaneous finishing of concrete floors in adjacent work zones. The method involves blending an initial mixing amount of an admixture into the concrete for the first period, followed by a second blending of a larger admixture in the second period. The expanded concrete and accelerated hardening admixture are mixed in a constant ratio before being applied to the concrete. This approach enables finishing work to be performed at the same time as concrete placement, significantly reducing the overall construction time.

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A special admixture for ultra-slow concrete that enhances its setting time while maintaining strength. The admixture combines modified phosphogypsum, sodium gluconate, sodium tripolyphosphate, sulfamic acid, hydroxypropyl methylcellulose, and sodium polyacrylate in specific weight ratios. This formulation delays cement hydration, particularly in high-temperature applications, while maintaining early strength and durability. The combination of these components effectively reduces cement hydration rates, enabling longer pouring times without compromising concrete performance.

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Additive mixture for concrete that delays setting time by up to 2-4 hours. The mixture comprises sodium gluconate, molasses, water, naphthalene sulfonic acid, and formalin. The gluconate and molasses slow down hydration, while naphthalene sulfonic acid enhances wetting and emulsification. Formalin contributes to a more stable setting process. This additive can be incorporated into ready-mix concrete to achieve controlled setting times for construction applications.

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Cement composition and method for producing the cement composition that enables rapid self-sustainability of concrete after mixing, while maintaining excellent workability. The composition comprises a base cement and an admixture containing a calcium silicate-based hardening accelerator and ultra-rapid-hardening cement, with specific mass ratios and content limits. The admixture enhances the cement's self-healing properties through controlled calcium silicate activation, while the ultra-rapid-hardening cement accelerates the hardening process. The composition demonstrates rapid self-sustainability and improved workability compared to conventional cement mixtures.

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A fast-setting concrete repair material that combines calcium aluminate with anhydrite for enhanced rapid hardening. The composition comprises a cement matrix, a calcium aluminate admixture, fine aggregate, anhydrite, sodium carbonate, and tartaric acid. The calcium aluminate admixture has a vitrification rate of 80% or more and a specific ratio of calcium to alumina (1.5:1 to 2.0:1). The admixture also contains sodium carbonate and tartaric acid. The cement content is between 100 parts by mass and 1900 parts by mass with respect to the admixture. The admixture is formulated to maintain consistent setting time across a range of environmental temperatures, with a maximum of ±20% change in initial setting time. The material incorporates short fibers and a salt adsorbent to enhance durability.

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Concrete early strength agent for enhancing both early and later strength of concrete. The agent comprises a combination of calcium chloride, calcium nitrite, calcium nitrate, triethanolamine, hydroxymethyl cellulose, polycarboxylic acid water reducing agent, nano silica, diatomaceous earth, and methacrylic acid. The agent provides rapid hydration of cement and concrete components, while its formulation ensures consistent performance across various concrete mix compositions.

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Pozzolanic cementitious composition comprising an activated clay between 20-85%, a limestone between 10-75%, and a setting regulator between 3-15%. The composition is formulated to achieve superior performance characteristics such as mechanical strength, Blaine, density, durability, workability, and chloride ion resistance compared to conventional cement formulations. The composition is designed to meet specific requirements for various cement applications, including general use, high early strength, and sulfate-resistant cements.

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Two-material ready-mixed concrete shipping type hard concrete material and a ready-mixed concrete shipping type hard concrete composition. The composition includes hardened cement and a curing accelerator containing aluminum, sulfur, sodium, and fluorine in a controlled ratio, where the natroalnite content in the curing accelerator is within a specific range.

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Ready-mixed concrete shipping type hard concrete material and composition for enhanced early strength development and long-term durability. The material combines cement, hardeners, and a specialized cement additive that incorporates an aluminum sulfate-based curing accelerator. This additive, which includes a sleeping agent that prevents premature hydration, enables controlled hardening and improved strength development during transportation. The composition achieves optimal performance by balancing early strength development with sufficient pot life, making it suitable for applications requiring rapid construction and long-term durability.

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High-performance concrete with enhanced early strength through a novel combination of additives and reinforcement. The concrete combines a proprietary quick-setting agent with a specialized reinforcement system comprising graphene oxide and nano-hydroxyapatite. The agent, which penetrates the cement hydration layer, accelerates calcium silicate hydration and forms calcium silicate hydrate gel. The reinforcement system, comprising graphene oxide and nano-hydroxyapatite, enables rapid coagulation of cement particles and forms a network structure that significantly enhances early strength. The combination provides superior early strength and resistance to cracking compared to conventional fast-setting concrete formulations.

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Ultra-early strength concrete with improved bonding properties for pavement repair applications. The concrete formulation combines a unique blend of cement, sandstone, and quick-setting particles with additives like polyethylene glycol and water-reducing agents. This composition enables enhanced bonding between the old and new surfaces while maintaining superior early strength and durability compared to conventional cement-based repairs. The formulation addresses the specific challenges associated with pavement maintenance by addressing early strength, bonding, and durability requirements for rapid traffic operations.

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A hardening agent for concrete that enables rapid hardening concrete delivery from a ready-mixed concrete plant. The agent, which is a dormant fast-hardening material, is added to the concrete during transportation. When mixed with cement and water, it triggers the hydration and hardening of the concrete, achieving faster hardening times than conventional cement-based systems. The agent can be formulated to achieve optimal performance in both short-term and long-term hardening conditions, with the agent enabling 120-minute or more hardening times.

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A rapid concrete composition for road repair and reinforcement that achieves improved durability and reduced cracking through a novel combination of cement and latex. The composition comprises a high Belite calcium sulfoaluminate cement, a high Belite calcium-sulfur aluminate cement, and a styrene-butadiene-styrene (SBS) latex. The SBS latex is added to the cement to enhance its mechanical properties while reducing shrinkage and cracking. The latex film also improves adhesion between the cement and aggregate. The composition is prepared with a specific ratio of cement to latex, with a water content optimized for rapid curing. The resulting concrete exhibits improved durability and reduced cracking compared to conventional cement-based repairs.

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Accelerating shotcrete production by enhancing its setting properties through the use of a novel accelerator. The accelerator, comprising β-naphthalenesulfonate formaldehyde condensate, is added to the shotcrete formulation to rapidly improve its setting characteristics. This enables faster shotcrete application and reduced application time, while maintaining the shotcrete's workability, durability, and cement content.

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A liquid phase concrete accelerator that maintains its dissolved state even at low temperatures, enabling early strength development in concrete construction. The composition comprises sodium sulfate, sodium nitrate, aluminum sulfate, sodium thiocyanate, and a sterically hindered alkanolamine, which are combined in a specific ratio to achieve optimal performance. This liquid accelerator can be used in conventional concrete mixing processes, eliminating the need for separate storage and mixing of powder accelerators. The composition can be applied to existing concrete formulations and construction methods, including the conventional cold weather curing process.

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Accelerator for ordinary silicate concrete that enhances early hydration and reduces demolding time. The accelerator combines with polycarboxylic acid water reducing agents to enhance hydration rates, while also providing improved water reducing properties. This synergistic combination enables enhanced concrete strength and durability, particularly in applications where rapid curing is critical.

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A novel concrete additive comprising lignosulfonate, retarder, strength enhancer, water-reducing agent, accelerator, modifier, and water. The additive combines these components in specific mass ratios to enhance concrete properties while maintaining its performance characteristics.

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Cement composition and method for producing the same that achieves both extended pot life and rapid setting properties. The composition combines a base formulation with a liquid quick-setting admixture, where the base formulation maintains its workability and setting characteristics at lower temperatures, while the quick-setting admixture enables rapid setting at higher temperatures.

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A method to enhance spray concrete quality by incorporating a novel auxiliary agent that improves setting characteristics without compromising pump feeding consistency. The agent, which contains calcium aluminum nitrate, lime, and gypsum, is added to the concrete before discharge through the nozzle. This pre-mixing process enables precise control over the agent's concentration and distribution, ensuring consistent setting performance while maintaining pump feeding stability. The agent enhances the quick-setting properties of the concrete, particularly in applications requiring high-strength and durability.

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Cement quick-setting agent and preparation method that combines the benefits of rapid setting with non-corrosive and environmentally friendly properties. The agent is a phosphate-based quick-setting cement additive that enables efficient concrete formation without compromising strength, while its non-corrosive nature eliminates the need for traditional alkaline-based accelerators. The preparation process involves a combination of traditional mixing and microwave drying/milling techniques to produce the cement quick-setting agent.

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A cement binder for concrete applications that enables rapid construction progress and improved concrete quality, particularly in dry or wet shotcrete processes. The binder comprises a rock flour component with a specific surface area and a binder component that combines to achieve enhanced early strength, early solidification, and accelerated hardening. The binder formulation includes a rock flour component with a low sulfate content and low sodium and chlorine levels, combined with a binder component that incorporates aluminates, calcium silicate hydrates, and other accelerating agents. This unique combination enables rapid cement hydration and solidification while maintaining high compressive strength and mechanical properties.

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A novel liquid concrete accelerator that replaces traditional admixtures with a unique combination of components. The accelerator comprises a mixture of tetrahydroxy-hydrated potassium aluminate and lithium aluminate with a specific ratio of lithium to potassium, stabilized with a polyethylene glycol, and enhanced with a polycarboxylate. This composition significantly improves concrete workability and strength at lower temperatures compared to conventional accelerators.

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A novel concrete admixture that enhances concrete performance through strategic incorporation of elements during the hydration process. The admixture combines a polymer carrier with specific elements to achieve enhanced curing characteristics, including accelerated curing, improved reinforcement bonding, and enhanced water retention. The polymer carrier enables the delivery of metal ions during hydration, while the specific elements enhance the polymer's retarder and accelerator properties. The admixture can be applied as a surface coating or incorporated into the cement matrix, providing comprehensive benefits for concrete applications.

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Nano-silica powder doped early strength high-performance concrete that enhances concrete's early strength through controlled nano-SiO2 incorporation. The nano-SiO2 particles form a unique network structure within the cement matrix, particularly at the CSH gel phase, which significantly improves concrete's early strength properties. This approach enables the development of high-performance concrete with enhanced mechanical performance, reduced shrinkage, and improved durability.

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An early strength agent for phosphogypsum-based cement concrete that improves its strength and durability through a combination of metakaolin, silica fume, and a polycarboxylate water-reducing agent. The agent enhances the cement's early hydration and strength development by reacting with the cement's components to form a gel network. The polycarboxylate water-reducing agent is added to the cement mixture to control the hydration process, while metakaolin and silica fume contribute to the gelation process. This combination enables faster and more efficient cement hydration, leading to improved early strength and durability.

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Producing concrete with controlled setting and hardening times through a novel mixing process. The method involves producing cement paste with retarder addition and setting time control, where the retarder suppresses setting and hardening. The cement paste is then mixed with aggregate to produce concrete, where the setting delay is canceled through physical mixing. This approach eliminates the need for separate retarder and promoter systems while maintaining the same production flexibility as conventional methods.

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Concrete with enhanced durability and improved workability, particularly for rapid repair applications. The concrete combines a fast-hardening admixture with a paraffin emulsion and a setting retarder, which are blended together in the concrete mixture. This combination provides both rapid initial strength development and controlled strength development, enabling the concrete to achieve high compressive strength at 12 hours while maintaining workability. The paraffin emulsion enhances the concrete's durability and resistance to cracking, while the setting retarder ensures consistent strength development throughout the concrete's life cycle.

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