Is the finer the cement, the better?
Whether the viewpoint is correct or not, it has aroused a lot of curiosity, as if the fineness of cement can be arbitrarily controlled.
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Recently, I heard a new term in the concrete forum called “universal theory of grinding”.
Its main viewpoint is that materials such as cement and admixtures need to be ground, and the fine fineness of cementitious materials causes concrete cracking.
No matter what material is ground, it can be used in concrete.
The research on cement fineness has been ongoing since the emergence of cement, and based on our understanding of the properties of cement concrete, we are constantly deepening.
However, due to the complexity and dynamic nature of cement concrete, it may be futile to use only a single indicator to limit cement in order to achieve good concrete performance, Similarly, many experts in the concrete industry attribute the responsibility for concrete deterioration to cement grinding, which is also farfetched.
In fact, cement fineness, as an important indicator of cement quality control, not only reflects the level of cement quality, but also reflects the comprehensive performance of production process, technical level, control ability, equipment, energy consumption, cost, and other aspects.
As cement fineness (particle size distribution) is closely related to the composition, structure, and performance of cement, as well as other concrete properties, it may be insufficient to confirm only from the above three aspects, It is also expected that cement technicians will establish more models for the relationship between cement quality and concrete performance, in order to synchronize the improvement of cement quality with the improvement of ready-mixed concrete performance
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The opening date of the conference is approaching, and there are only a small number of booths and co organizers.
The understanding of cement fineness in the cement industry has also shifted from the previous national standard of 80% μ Screen residue control, specific surface area control, 45 μ The evolution process of controlling cement fineness through sieve residue control and particle grading control until today’s concrete performance indicators is a long and gradually deepening result, gradually linking a single indicator with the final product.
The aim is to redefine the reasonable range of cement fineness.
Moreover, if cement can meet customer requirements without grinding, why not engage in cement production? This article explores the constraints of environment, quality, and materials on cement fineness indicators from three aspects: carbon emissions from cement production, setting speed, and concrete carbonization.