graduate student
Moscow, Moscow, Russian Federation
employee
Moscow, Moscow, Russian Federation
employee
Moscow, Moscow, Russian Federation
691.54
61.35
18.02.05
383
60
The influence of modifier additives (six chemical compounds differing in their structure) on the properties of cements of dif-ferent mineralogical and chemical composition has been studied using the Taguchi method of multifactor experiment planning. Cements differing in the content of tricalcium silicate (3CaO·SiO2 - 68.9-72.9 %) and dicalcium silicate (2CaO·SiO2 - 8.6-11.8 %) were studied. The influence of limestone and granulated metallurgical slag as mineral additives was studied. It is shown that the Taguchi method is applicable to study the influence of various factors on the hydration and structure formation processes of cements. It was found that depending on the cement composition, chemical substances - additives modifiers act differently on the strength of cement stone. Thus, the use of triethanolamine and sodium thiocyanate to a greater extent affects the increase in early strength, and the use of triisopropanolamine and molasses affects the increase in the final strength of the studied cements. The use of combined isopropanolamines, such as diethanolizopropanolamine, combining properties from alkanolamines, affect the increase in early strength by accelerating the hydration of 3CaO·Al2O3, as well as the final strength by increasing the degree of hydration of 4CaO·Al2O3·Fe2O3, 3CaO·SiO2 and 2CaO·SiO2. The chemical compounds - modifier additives interactions between each other are shown. Optimal dosages of chemical compounds application are determined. Regression equations are obtained, thanks to which it becomes possible to calculate the strength of cements in early and final curing periods depending on the dos-ages of additives used. Due to the effect of strength increase it is possible to achieve a stable reduction of cement content in the concrete mixture, which has a positive effect on the economic and environmental components.
Taguchi method, multivariate experiment, cement, strength, hydration, alkanolamines, isopropanolamines, modifying additives
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