A comparative study on the influence of metakaolin and kaolin additives on properties and structure of the alkaliactivated slag cement and concrete
Journal Title: Восточно-Европейский журнал передовых технологий - Year 2018, Vol 1, Issue 6
Abstract
<p>The influence of the metakaolin and kaolin additives on the formation and properties of the alkali-activated slag cements and concretes was studied.</p><p>The influence of the metakaolin and kaolin additives on macro- and microstructure formation of the cements and concretes was studied.</p><p>A conclusion was drawn that the processes of microstructure formation of the cement stone with the additive flow in a similar sequence but with different intensity. A conclusion was drawn that the addition of the kaolin instead of metakaolin affected as follows: 2.5–10 % by mass reduced the value of NCP by 9.5–8.7 %, respectively; 2.5–5 % by mass did not affect setting times, but with increase up to 10 % by mass the initial setting time was shorter (from 48 min to 40 min); 2.5–5 % by mass did not affect compressive strength at all stages of hardening, but with increase up to 10 % by mass reduced strength characteristics of the cement-sand specimens (from 57.0 MPa to 49.0 MPa).</p><p>In case of the addition of 5 % kaolin by mass, an optimal macrostructure of the concrete is formed in which the quantities of the ''conditionally'' closed pores are by 17.7 % higher compared to those of the concretes with the same quantities of the metakaolin. This resulted in the higher freeze/thaw resistance of the concrete (from F400 up to F500). Based on the comparison of properties and structure of the cement and concrete containing the kaolin and metakaolin additives, a possibility to substitute metakaolin by kaolin as a correcting additive was established.</p>
Authors and Affiliations
Pavel Krivenko, Oleg Petropavlovskyi, Oleksandr Kovalchuk
Keywords
Related Articles
- EP ID EP527771
- DOI 10.15587/1729-4061.2018.119624
- Views 95
- Downloads 0
The synthesis of control algorithm over a technical condition of the hydrogen generators based on hydroreactive compositions
<p>We have synthesized a control algorithm over technical condition of the hydrogen generators, which includes the following: forming initial data, determining the values for a phase-frequency characteristic of the gener...
Determination of the enzyme destruction rational mode of biomass autolysate of lactic acid bacteria
<p>It is shown that the degradation products of peptidoglycans of lactic acid bacteria cell walls that are related to the muramyl peptide series compounds are promising components of food ingredients and dietary suppleme...
Development of calculation schemes for the combined extrusion to predict the shape formation of axisymmetric parts with a flange
<p>We have developed calculation schemes for the process of combined radial-reverse extrusion of parts with a flange. Based on the energy method, we have derived formulae for calculating the reduced pressure of deformati...
Electrochemical regeneration of oxygencontaining compounds in the extracts of used oils
<p>Growth in the volumes of oils applied for various purposes, including motor oils, results in the formation of large quantities of toxic waste – used oils. At the same time, they are a valuable raw material for the pro...
Optimization of the deposition conditions for Ni(OH)2 films for electrochromic elements of “smart” windows
<p class="1">Thestudywasconductedinordertodeterminethe influenceoftwofactorsonelectrodepositionofNi(OH)<sub>2 </sub>films: concentrationofnickelnitratein the electrolyteanddrying stage between deposition and electrochemi...