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What impact does ultrafine calcium carbonate have on the strength properties of cement?
Release time:
2020-11-11
Cement is a crucial material in construction, and its performance directly affects the long-term stability of buildings. To enhance its properties, ultrafine calcium carbonate is incorporated during the manufacturing process.
Cement is a crucial material in construction, and its performance directly affects the long-term stability of buildings. To enhance its properties, ultrafine calcium carbonate is incorporated during the manufacturing process.
I. Ultrafine calcium carbonate, as a nanomaterial, exhibits the characteristic effects and superior properties of nanomaterials.
II. Effect of Ultrafine Calcium Carbonate on the Compressive Strength of Cement Paste
1. Upon incorporation of ultrafine calcium carbonate, in the presence of gypsum, the material first accelerates the reaction between calcium ions and gypsum to form ettringite, thereby depleting the gypsum more rapidly. Concurrently, as ettringite transforms into monosulfate phase, calcium aluminate hydrate is markedly formed and gradually increases in quantity.
2. Our product also acts as a crystal nucleus for the hydration of C3S. As C3S begins to hydrate, it releases large amounts of Ca²⁺ ions. Ca²⁺ ions exhibit significantly higher mobility than the [SiO₄]⁴⁻ ion group. According to adsorption theory, when Ca²⁺ diffuses to the surface of CaCO₃ particles, the common-ion effect causes physicochemical adsorption of Ca²⁺ onto the particle surface, thereby reducing the local concentration of Ca²⁺ ions around the C3S particles in the hydration products and accelerating the hydration of C3S.
These changes in the aforementioned aspects have contributed to the enhancement of cement’s strength performance: early-age strength generally increases with increasing dosage of ultrafine calcium carbonate, whereas late-age strength tends to decrease as the dosage rises. By investigating the patterns of how the incorporation of ultrafine calcium carbonate into cement affects its properties, new application prospects for micro- and nanomaterials can be opened up, while also enabling improvements in the performance of cement-based materials, conservation of limestone resources, and increased utilization rate and effectiveness of calcium carbonate.
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