Investigating the influence of volumetric hydrophobization on the formation of phase composition of cement stone and its physical-mechanical properties
Journal Title: Восточно-Европейский журнал передовых технологий - Year 2019, Vol 4, Issue 6
Abstract
<p>We have examined the influence of the most widely used silicon-organic surface water repellent GKZH-11K on the physical-mechanical properties and the phase structure formation of cement is the fact that the introduction of the surface water repellent GKZH-11K to the composition of cement slurry leads to the formation of dispersive water-repellent films of various levels (size). These films adsorb at the surface of cement grains, as well as at the surface of hydrated components of cement particles, Са(ОН)<sub>2</sub>, calcium sulphoaluminates. It was determined that the disperse hydrophobic films partially block the penetration of water into the surface of cement grains and alter the kinetics of hydration.</p><p>This leads to a decrease in the degree of hydration and the content of Са(ОН)<sub>2</sub> in cement stone, resulting in the reduced shrinkage at hardening. At the same time, the disperse films adsorbed on neighboring hydrated cement particles within the contacts occurred in the process of their condensation can form hydrogen and chemical relationships. This interaction between the particles' films, despite the reduction in the degree of hydration, leads to a decrease in water absorption, improving the strength of cement stone, which in this case is also determined by the number and area of contacts per unit volume of cement stone. The overlap of pores with hydrophobic chains decreases the permeability of cement stone throughout its entire volume, which contributes to the growth of operational reliability and durability of structures, particularly thin-walled. Using this admixture for volumetric hydrophobization could greatly prolong repair-free operation of thin-walled products and structures, as well as bring down cost as there is no need to apply materials to protect the surface of concrete.</p>
Authors and Affiliations
Inna Trofimova, Nikolay Shpyrko
Keywords
Related Articles
- EP ID EP666894
- DOI 10.15587/1729-4061.2019.176430
- Views 70
- Downloads 0
Development of a method for experimental investigation of combustion process in lean burn gas engines
<p>The problems of engine experiments in the conditions of unstable combustion were considered. A practical problem was the experimental study of the influence of spark discharge parameters of the ignition system on the...
Constructing a method for the conversion of numerical data in order to train the deep neural networks
<p>This paper analyzes known types of deep neural networks, the methods of their supervised training, training the networks to suppress noise, as well as methods for encoding data using images. It has been shown that dee...
Development of a formal algorithm for the formulation of a dual linear optimization problem
<p>The rigorous formal algorithm for formulating a dual problem for different forms (general, basic, standard, and canonical) of a primal linear programming problem is proposed. First, definitions of a pair of dual probl...
Compaction of porous powder body consisting of the elasticplastic medium
<p>In the development of technological processes of producing cold-pressed sintered parts of low porosity, special attention is paid to the mechanism of density variation. In powder metallurgy, a multicomponent charge co...
Research into cavitation processes in the trapped volume of the gear pump
<p class="1CxSpFirst">We investigated processes in the trapped volume of the gear pump, formed due to the peculiarities in the geometry of the involute gearing characteristic of the pumps of a given type. In the fluid co...