Method for measuring and calculating hydration reaction activated energy of concrete blended with magnesium oxide and application

Abstract

The invention belongs to the technical field of simulation of concrete structures, and relates to a method for measuring and calculating hydration reaction activated energy of concrete blended with magnesium oxide and application. The method comprises the following steps: establishing the relation between magnesium oxide hydration reaction rate and temperature, magnesium hydration degree as well as hydration reaction activated energy according to an Arrhenius formula; establishing a mathematical model of the magnesium oxide hydration reaction activated energy in the concrete in combination with the relation between the magnesium oxide hydration degree and concrete swelling capacity; and calculating the magnesium oxide hydration reaction activated energy in magnesium oxide concrete by the established mathematical model in combination with test data of autogenous volume deformation of the magnesium oxide concrete. The algorithm of the invention is deduced by mathematical equations, and is precise theoretically, and the hydration reaction activated energy can be directly solved with the aid of the data of the autogenous volume deformation of cement containing magnesium oxide; comparedwith a mode of directly reacting magnesium oxide with water or carrying out hydrating kinetics analysis on the cement containing the magnesium oxide, the method can really reflect reaction conditionsof the magnesium oxide in the concrete, is simple, and is convenient to operate.

Description

technical field [0001] The invention belongs to the technical field of concrete structure simulation, and in particular relates to a method and application for measuring and calculating the activation energy of hydration reaction of externally mixed magnesium oxide concrete. Background technique [0002] Adding magnesia to concrete is one of the very effective anti-cracking technologies: using the micro-expansion of magnesia hydration, it can compensate the tensile stress and volume shrinkage of concrete during the cooling process, so as to prevent structural cracking the goal of. The research on shrinkage compensation of magnesium oxide concrete is of great significance for more effective use of the shrinkage compensation function of magnesium oxide concrete in the process of actual engineering research and design. The hydration kinetics of periclase is the theoretical basis for the expansion of magnesia concrete. It is of great significance for understanding the expansion...

AI Technical Summary

Problems solved by technology

Compared with reacting directly with pure water, the situation of magnesium oxide in cement concrete is more complicated

In some studies, periclase contained in cement clinker is used. This kind of periclase has a high formation temperature, low hydration activity, and will be partially wrapped by cement minerals. The hydration of periclase is affected by cement hydration.

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