Vaterite Calcium Carbonate Cementitious Compositions
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Solution Overview
Problem
The production of conventional cements contributes significantly to carbon dioxide emissions through calcination and energy consumption, necessitating the development of alternative cementitious materials that can sequester CO2 and provide equivalent or superior structural performance.
Innovation Solution
A composition comprising at least 47% w/w vaterite and/or amorphous calcium carbonate, which, when combined with water or cement, sets and hardens to achieve compressive strengths of at least 14 MPa, while also sequestering CO2, thereby reducing environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional cements are used to achieve structural strength, then compressive strength is improved, but carbon dioxide emissions increase due to calcination and energy consumption
Solution Approach 1:
The patent changes the chemical composition parameters by using vaterite calcium carbonate (at least 47% w/w) and amorphous calcium carbonate (at least 1% w/w) as supplementary cementitious materials instead of conventional cement ingredients, achieving both high compressive strength and CO2 sequestration
Solution Approach 2:
The patent creates a composite cementitious material combining vaterite, amorphous calcium carbonate, and other components in specific proportions to achieve superior mechanical properties while reducing environmental impact through CO2 sequestration
2Object-generated harmful factors
If vaterite and amorphous calcium carbonate are used as supplementary cementitious materials to sequester CO2, then environmental impact is reduced, but compressive strength may be compromised
Solution Approach 1:
The patent optimizes the compositional parameters by specifying at least 47% w/w vaterite and at least 1% w/w amorphous calcium carbonate, along with controlled amounts of other components, to achieve both CO2 sequestration and high compressive strength of at least 14 MPa
Solution Approach 2:
The patent develops a composite material system where vaterite and amorphous calcium carbonate work synergistically with other components to provide both environmental benefits through CO2 sequestration and mechanical performance through enhanced compressive strength
Data Source
AI summary
Provided herein are compositions and methods including hydraulic cement, supplementary cementitious material, and/or self-cementing material. Methods for making the compositions and using the compositions are provided.