Dicalcium silicate is one of the four main components of portland cement clinker, which usually exists in the form of solid solution (called belite, which is usually difficult to distinguish from dicalcium silicate in cement chemistry) and contains a small amount of Al, Fe and other elements.
Silicate minerals are the main source of cementitious properties of cement, among which dicalcium silicate mainly provides cement with late strength, while tricalcium silicate, another major silicate mineral, mainly provides cement with early strength. Compared with tricalcium silicate, dicalcium silicate minerals have unique characteristics in composition, formation and performance, especially in solving the problems of resources and energy, reducing emissions and improving performance.
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Activity of dicalcium silicate
The so-called activity in cement chemistry has two meanings, on the one hand, the degree of reaction with water in a specific period of time, on the other hand, the contribution of the products to the development of strength, porosity and other properties and structures.
The hydration activity is usually measured by the combined water amount, hydration heat release amount, hydration degree and strength in a specific time, in which the combined water amount, hydration heat release amount and hydration degree actually represent the first meaning of activity, while strength is the synthesis of two meanings. For the activity between dicalcium silicate, the first meaning of activity is generally considered to be the most important.
The study of dicalcium silicate has gone through a century, and its crystal structure and crystal transformation have been clearly and profoundly understood, and some progress has been made in the activation of belite minerals. However, the mechanism of activity difference of dicalcium silicate, especially the activity difference caused by foreign ions, is still lacking in-depth understanding, and the practical activation method of dicalcium silicate needs further study.
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