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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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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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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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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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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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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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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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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