Low Carbon Cement for Sustainable Construction

Low-carbon cement that replaces conventional Portland cement while maintaining compatibility with existing systems. The cement contains a water-reducing superplasticizer, achieving high water reduction rates (over 40%), improved 28-day shrinkage, and enhanced compressive strength. The cement formulation enables reliable use in current production processes while minimizing carbon emissions.

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Concrete for low-carbon construction that incorporates biochar as a primary aggregate component, achieving a negative carbon footprint of up to -1434 kg CO2/m³. The concrete composition combines cement, biochar, and water to produce a dense, mechanical-resistant material with reduced carbon emissions compared to conventional concrete. The biochar replaces conventional aggregates, maintaining comparable mechanical properties while significantly reducing carbon footprint.

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Cement blends that significantly reduce greenhouse gas emissions through the use of decarburized lime and pozzolans. The blends combine decarburized lime with pozzolans and optional additional components to produce cement with minimal CO2 emissions. The decarburized lime can be produced through a process that captures CO from combustion sources and atmospheric emissions. The resulting cement blends have lower than usual CO2 emissions compared to conventional Portland cement, making them suitable for applications where environmental sustainability is a priority.

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Integrated cementitious material for high-performance low-carbon concrete that combines Portland cement, high-calcium iron belite sulfoaluminate cement, limestone, and fly ash. The material is prepared through a simplified formulation process that combines these four basic raw materials in a single, optimized ratio, eliminating the need for separate cement and mineral admixtures. The resulting material provides improved early hydration activity and enhanced performance characteristics compared to conventional low-carbon concrete formulations.

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Curable cement composition containing cement, water, fine aggregate, coarse aggregate, and biochar, which enables effective carbon dioxide reduction through biochar-based carbon capture. The composition combines cement with biochar to form a hardenable cement that incorporates biochar particles, which absorb CO2 during curing. The biochar absorbs CO2 through chemical reactions, reducing the overall carbon footprint of the cement production process. The resulting hardened cement product retains its performance characteristics while incorporating the carbon-capture benefits of biochar.

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Carbonated biomass ash as a cementitious material substitute that enables CO2 reduction during cement production while maintaining mechanical properties. The ash is obtained by carbonating biomass from combustion processes and is stabilized through controlled water regulation. The carbonated ash exhibits improved carbonation properties compared to traditional cement additives, enabling natural carbonation of concrete to reduce CO2 emissions.

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Green low-carbon concrete that achieves significant carbon reduction through enhanced carbon absorption while maintaining high strength. The innovative formulation combines a high-performance Portland cement with fly ash, blast furnace slag, lithium slag, and waste water, along with a water-reducing agent. The resulting concrete exhibits superior carbon capture capabilities, particularly in the early stages of hydration, while maintaining high compressive strength. This approach enables the production of low-carbon concrete that not only reduces cement consumption but also enhances its carbon absorption capacity.

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A low-carbon cement system that significantly reduces cement preparation energy consumption and CO2 emissions through a novel clinker composition. The system combines a low-heat Portland cement clinker with a calcium sulfoaluminate-based clinker and gypsum to produce a composite cement with improved thermal stability and compressive strength. The clinker composition achieves a lower C3 content and increased C2 content compared to conventional Portland cement, resulting in lower thermal energy requirements during hydration. The resulting composite cement exhibits improved performance characteristics, including reduced hydration heat and compressive strength, while maintaining comparable quality to conventional Portland cement.

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A low-carbon concrete composition and method to produce it, comprising biochar with enhanced rheologic and strength properties. The composition comprises Portland cement, biochar, and limestone filler, with biochar serving as a binder in Portland cement. The biochar enhances cement rheology and strength while providing carbon sequestration through carbon dioxide capture.

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A green low-carbon recycled concrete material that achieves improved mechanical properties through enhanced alkali-activated fly ash (FA) content and particle size reduction. The material combines the benefits of reduced carbon footprint from volcanic ash waste with improved concrete performance characteristics. The preparation method involves optimizing FA content and particle size reduction through controlled steam curing and alkali activation, enabling the production of high-performance recycled concrete that meets stringent sustainability requirements.

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Carbon-neutral geopolymer concrete that integrates fly ash and biochar to reduce CO2 emissions in traditional concrete production. The method optimizes the synergistic effects of these materials by precisely controlling their incorporation into the geopolymer matrix, ensuring enhanced mechanical properties and durability while maintaining a low carbon footprint. The process involves preparing the geopolymer binder through alkaline activation of fly ash, followed by controlled incorporation of biochar to achieve a carbon-neutral effect. The concrete is then cast and cured under controlled conditions to achieve desired strength and durability characteristics.

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Cementitious material with low CO2 footprint for construction applications that replaces traditional Portland cement. The material is made by milling together lime and a pozzolanic material like metakaolin or fly ash. The milling process enhances reactivity and bonding between the materials without adding additional chemicals. The resulting cementitious material has comparable compressive strength to regular cement. The low-CO2 alternative avoids the energy-intensive calcination and clinkering steps of Portland cement production.

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Belite-ye'elimite-ternesite cement clinker for construction applications, comprising elevated ternesite content and enhanced reactivity. The clinker contains more than 40 wt. % aluminum from industrial waste, including low-grade bauxite, alumina ash, high-alumina fly ash, or a combination thereof. The clinker's mass ratio of ternesite to ye'elimite is 0.5-1, with the aluminum source contributing to restricted ye'elimite mineral formation, enabling improved early-stage strength and later-stage hydration reactivity. The clinker's mass ratio of belite to ternesite is 0.25-1.

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A low-carbon cement clinker formulation that achieves superior strength performance through optimized mineral composition ratios. The clinker is formulated by controlling the proportions of calcium sulfoaluminate, anhydrous calcium silicate, and calcium sulfosilicate minerals, which exhibit lower carbon emissions compared to traditional Portland cement. The controlled mineral composition ratio enables enhanced early strength development through rapid hydration of C4A3$, while the later-stage strength is improved by the hydration of C2S. The optimized composition ensures both early and late-stage strength improvements, making the low-carbon cement suitable for demanding construction applications.

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A limestone calcined clay cement (LC3) construction composition and an aqueous water-reduced freshly mixed construction composition for precast concrete applications, achieving high early strength through innovative ettringite control. The composition comprises a cement with sufficient available aluminate content, a water-reducing agent, and a co-retarder that prevent ettringite formation during hydration. The water-reducing agent, a glyoxylic acid-based dispersant, and the co-retarder, a borate source, work synergistically to control ettringite growth while maintaining optimal cement hydration and workability. The composition enables high early strength, sufficient open time, and improved durability in precast concrete applications compared to conventional Portland cement-based mixes.

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A method for producing a curable cement composition that reduces carbon dioxide emissions during concrete manufacturing. The composition incorporates biochar, a material derived from biomass, into a cement matrix. The biochar particles are combined with cement, water, aggregate, and a chemical admixture containing an air entraining agent (AE agent), while maintaining optimal air content. The biochar particles are specifically engineered to enhance air penetration, while the AE agent ensures sufficient air supply. This combination enables controlled cement hydration and reduces carbon dioxide emissions through improved air distribution.

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A binder composition for concrete and mortars that combines Portland cement with calcium aluminate cement (CAC) and calcium sulfoaluminate cement (GSA) to achieve improved early strength while maintaining low carbon footprint. The composition comprises Portland cement, CAC, GSA, and pozzolanic and latent hydraulic materials. The CAC and GSA react to form a synergistic pozzolanic system that accelerates early strength development while maintaining the binding properties of Portland cement. This composition enables concrete and mortars to achieve higher early strength with reduced carbon footprint compared to conventional Portland cement-based systems.

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Belite Portland cement-based green ultra-high performance concrete that reduces cement consumption and carbon emissions compared to conventional Portland cement-based UHPC. The concrete contains a minimum of 300kg/m3 Belite Portland cement, incorporating basalt powder as a gelling component, with copper-plated steel fibers and a reduced amount of conventional cement and admixtures. The cement formulation incorporates gypsum with a 5wt% clinker mineral composition, achieving a 28d compressive strength of 42.5MPa and a 3d heat of hydration of 230J/g.

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Cementitious binder comprising precipitated lime and at least one pozzolan, which provides a cement with reduced embodied carbon emissions compared to conventional portland cement. The binder comprises precipitated lime and at least one pozzolan, which are produced using a process with substantially reduced CO2 emissions to the atmosphere due to the consumption of fossil fuels. The pozzolan may be produced using a process with substantially reduced chemical CO2 emissions to the atmosphere, meaning CO2 emissions originating from chemical reactions involved in synthesizing the material.

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A method for optimizing cement composition through the use of a carbon model that predicts cement properties based on component concentrations. The method iteratively calculates a set of cement compositions that meet specific cement constraints using cement property models, and then selects the optimal composition based on its carbon footprint. This approach enables the development of cement compositions with reduced carbon emissions by identifying the most environmentally friendly composition combinations.

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Low carbon concrete composition and method to produce it, comprising a water-reducing additive comprising at least one phosphonic amino-alkylene group; aggregates; and Portland cement as a hydraulic binder, which produces strength-forming phases by solidifying and curing in contact with water. The composition and method achieve reduced viscosity, shortened setting times, and satisfactory strength development through the use of a water-reducing additive comprising phosphonic amino-alkylene groups, while maintaining emissions of carbon dioxide during manufacturing.

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A binder composition that combines the strength benefits of Portland cement with improved early strength and durability characteristics. The composition comprises a binder comprising calcium aluminate cement (CAC) and calcium sulfate source, with pozzolanic and/or latent hydraulic materials. The binder is formulated to provide enhanced early strength while maintaining low carbon footprint compared to traditional Portland cement-based binders.

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Method for producing cement with reduced carbon footprint through a novel approach that replaces traditional limestone with a source of silicon and aluminum, specifically aluminosilicate materials, in Portland cement clinker. The clinker is treated at elevated temperatures to form a mixture with high alkali content, enabling the formation of geopolymers that enhance cement's hydraulic properties. This approach enables the production of cement with significantly reduced CO2 emissions compared to conventional Portland cement production, while maintaining the required strength and durability characteristics.

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Cementitious compositions that incorporate carbonated biochar as a key component. The carbonated biochar is obtained through a controlled carbonation process that converts pyrolyzed organic matter into a stable, carbon-rich material. The carbonated biochar is then incorporated into cement-based systems at levels of at least 1% by weight, enabling the production of low-carbon cements with comparable mechanical properties to conventional Portland cements.

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A high-performance low-carbon concrete that significantly reduces cement emissions while maintaining superior mechanical properties. The concrete combines a surface treatment agent with a silane coupling agent dissolved in ethanol, which is applied to the concrete surface before curing. This treatment enhances the concrete's durability and resistance to degradation while minimizing its environmental impact. The concrete formulation includes Portland limestone cement, slag powder, silica fume, rice husk ash, rubber powder, lignin fiber and steel fiber, and water-reducing agent. The reinforcement fibers are strategically combined in a 1:2 ratio to achieve optimal mechanical performance.

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A composite cement material that combines laterite with calcium carbonate to enhance its performance and reduce carbon emissions. The material combines natural laterite with calcium carbonate in a specific mass ratio, where the laterite's high iron content and aluminum content are utilized to stimulate pozzolanic activity. The calcium carbonate enhances the cement's density and hydration properties, while the laterite's iron content promotes the formation of calcium sulfoaluminate hydrate, contributing to cement strength. The material achieves improved hydration characteristics and reduced carbon footprint compared to conventional cement formulations.

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Silicoparticulate slag limestone composite cementitious material for low-carbon concrete production, comprising a combination of silicoparticulate slag, limestone, Portland cement, gypsum, and coal combustion residue. The material achieves enhanced properties through the controlled interaction of these components, particularly in concrete applications requiring improved mechanical strength and durability. The composition is optimized to meet the specific requirements of various concrete mixes, including high-strength concrete, while minimizing the amount of Portland cement clinker.

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A low-carbon concrete and cementitious material that enhances concrete performance through a novel combination of recycled aggregate and high-pozzolanic fly ash. The material achieves superior workability, improved pumpability, reduced thermal expansion, and enhanced durability compared to conventional concrete systems. The innovative approach involves incorporating 30% recycled aggregate into the concrete mix, which absorbs more CO2 during the crushing process. This recycled aggregate, combined with high-pozzolanic fly ash, provides enhanced strength properties and improved concrete durability. The combination of these materials offers significant environmental benefits while maintaining the performance characteristics of traditional concrete.

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A binder composition for concrete that combines calcium aluminate cement (CAC) with metakaolin to achieve improved early strength while maintaining low carbon footprint. The composition comprises a binder comprising at least 1.5% calcium sulfate by weight of dry component, with the binder further comprising Portland cement clinker, metakaolin, and optional calcium sulfate source. The binder composition provides enhanced early strength and durability characteristics for construction applications, particularly in building construction where high early strength is required.

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A novel binder composite for construction applications that achieves early-age compressive strength comparable to portland cement through a cost-effective and environmentally friendly approach. The binder combines fly ash with calcium oxide, nanosilica, and sodium hydroxide in a specific molar ratio, with nanosilica content optimized for enhanced mechanical properties. The binder composition is formulated using a Taguchi design approach that balances multiple variables while maintaining a constant total molar ratio of OH, CaO, and SiO2. This novel approach enables the development of a binder with reduced sodium-based activators compared to conventional cement formulations, significantly lowering production costs and environmental impact.

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Low-carbon cement that improves dry-wet cycle stability for construction applications. The cement contains a combination of industrial waste residue, Portland cement, alkaline activator, hydrophobic additive, water-reducing agent, and desulfurized gypsum. The industrial waste residue is a blend of mineral powder and fly ash. The cement achieves enhanced performance in both dry and wet conditions by incorporating these components in specific ratios, while maintaining optimal strength and durability.

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Hydraulic binder for mortar that combines steelworks slag with a catalyst to achieve a more environmentally friendly binder. The binder comprises at least 60% steelworks slag and at least one catalyst activator, which enables the production of a binder with improved carbon and energy balance compared to conventional binders. The catalyst activator enhances the binder's rheological properties and improves its compatibility with aggregate and water, resulting in improved mortar performance.

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Hydraulic binder comprising an amorphous calcium silicate phase with an overall C/S molar ratio of 1.1, produced through a single-step heating and cooling process. The binder is characterized by its unique composition of amorphous calcium silicate with a specific C/S ratio, which enables enhanced hydration properties compared to conventional cement binders. The binder's amorphous structure ensures improved workability and durability, while its C/S ratio of 1.1 provides optimal hydraulic activity. The binder can be formulated with supplementary materials, such as metakaolin or fly-ash, to enhance its performance.

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Cement comprising cupola slag and an alkaline activating agent, wherein the cupola slag is derived from a cupola furnace process and the alkaline activator is a chemical compound of alkaline and alkaline earth elements, and wherein the cement is useful for preparing building materials.

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Concrete composition that utilizes blast furnace slag as a primary binder component, with optional addition of a hardener, retarder, and aggregate. The composition incorporates blast furnace slag fine powder, a hardening agent, and aggregate materials, with the hardening agent being either a calcium hydroxide or a calcium-based admixture. The composition achieves improved initial strength development and neutralization resistance through the combination of these components.

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Supplementary cementitious material for low-carbon high-performance concrete that enhances durability through improved microstructure control. The material, formulated with a blend of slag powder, fly ash, silica fume, desulfurized gypsum, and superplasticizer, is processed at high speed to create a cementitious material with controlled particle size distribution. This processing enables a comprehensive solution for improving concrete durability by addressing both cement hydration and aggregate microstructure characteristics.

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A low-carbon cement that utilizes industrial solid waste as a primary raw material and limestone as a secondary raw material in the production of ordinary Portland cement. The cement achieves comparable environmental performance to conventional Portland cement while significantly reducing CO2 emissions. The process involves processing industrial solid waste into a low-grade raw material, which is then mixed with limestone to produce a cement that meets the requirements of the environmental labeling standards.

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