Abstract
We conducted thermodynamic studies of creation of the compounds of calcium hydrosilicates. The comparison was performed of the use of calcium hydroxide and calcium oxide in the calciumsilicate mixture. It is demonstrated that the higher thermodynamic probability of reaction is characteristic for calcium oxide. The values of enthalpy of reaction with calcium oxide were examined. Reaction with calcium oxide has an exothermic character. The use of calcium hydroxide leads to the endothermic nature of reaction. The effect of mechanical activation and chemical activation on strength of the samples of silicate brick is confirmed. The joint action of these types of activation is more effective. The occurrence of a synergetic effect with the joint action on the mixture of mechanical and chemical activation is shown. It was established that the joint action of mechanical and chemical activation creates conditions for reactions of the creation of calcium hydrosilicates without an autoclave. This is important since this makes it possible to create more energyefficient technologies for silicate building articles.
Highlights
IntroductionFor the first time in 1880 [1], the first artificial stone was obtained from the mixture of sand and lime, after exposure for 8 hours in an autoclave under pressure of 8 atmospheres in the medium of saturated vapor
Under the action of temperature, in the medium of saturated water vapor, physical-chemical processes occur in the autoclave between components of the mixture, as a result of which calcium hydrosilicates form, which provide for the strength of silicate brick
It is demonstrated that the change in the Gibbs energy of all reactions of the formation of hydrosilicates with the use of calcium oxide testifies to the possibility of their passage under standard conditions
Summary
For the first time in 1880 [1], the first artificial stone was obtained from the mixture of sand and lime, after exposure for 8 hours in an autoclave under pressure of 8 atmospheres in the medium of saturated vapor. Since the technology of silicate brick practically has not changed. It consists of several stages: preparation of lime-silica binder by grinding a mixture of lime and sand, exposure of this binder in the capacities for providing the most complete lime hydration, molding the articles by pressing from the mixture of the binder and unground sand and thermal treatment in autoclaves. Under the action of temperature, in the medium of saturated water vapor, physical-chemical processes occur in the autoclave between components of the mixture, as a result of which calcium hydrosilicates form, which provide for the strength of silicate brick
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