Research of Mechanochemical Processes of Activation of Building Materials by Air-Impact Method

Igor Kravchenko,Kudrat Bobomurodov,Aleksandr Fedorov,Shukurilo Yuldashev,Jaloliddin Matyokubov,Mihail Erofeev,Diana Abdumuminova,Valeriy Kondrashchenko,O Tursunov

doi:10.1051/e3sconf/202130402009

Abstract

To increase the specific surface area of the binder and accelerate the strength gain of fast-hardening concrete mixtures, a model has been created for calculating aeroactivators as part of mobile complexes based on new equipment for cement activation, sand enrichment, local materials, and production waste. The proposed model establishes the dependence of the rate of destruction of the dusty shell of particles on the mechanical impact of the beaters and materials` physical and mechanical characteristics. To improve the operational characteristics of the cement aeroactivator, experimental studies were carried out, the results of which made it possible to determine the rational parameters of the developed installation. Based on the test results, it was found that the use of the cement activation process with additives accelerates the hardening process of concrete and mortar mixtures in the initial period, increases the design strength of concretes and mortars by 20–40% in comparison with the strength of the control composition at the same cement consumption, and also reduces the consumption cement up to 17% to obtain concretes and mortars equal to the control composition at the design age.

Highlights

In remote, hard-to-reach areas with harsh climatic conditions, the construction of housing and infrastructure facilities is impossible without the use of activated local building materials and technological equipment with effective characteristics [1,2,3,4]
The development of technological equipment for mobile construction complexes about the local resource base, natural and climatic conditions should be carried out using modern methods of mathematical programming and computer-aided design tools based on multi-criteria analysis [5, 6]
- control composition - based on non-activated cement; - composition No 1 - based on activated cement; - composition No 2 - based on an activated mixture of cement with the addition of 0.3% dihydrate gypsum based on the mass of cement; - composition No 3 - based on an activated mixture of cement with the addition of 3.0% dihydrate gypsum based on the mass of cement

Summary

Introduction

Hard-to-reach areas with harsh climatic conditions, the construction of housing and infrastructure facilities is impossible without the use of activated (additional grinding and grinding) local building materials and technological equipment with effective characteristics [1,2,3,4]. The development of technological equipment for mobile construction complexes about the local resource base, natural and climatic conditions should be carried out using modern methods of mathematical programming and computer-aided design tools based on multi-criteria analysis [5, 6]. The methods of activating Portland cement are well studied, confirmed by numerous studies, and supplemented by practical results, in particular, by increasing the fineness of its grinding, they are not widely used due to the lack of applied methods for calculating effective small-sized equipment used in mobile construction complexes. The following tasks have been identified: a) determination of the degree of activation by comparing the fractional composition of the original and activated cement by the residue on the sieve; b) study of the physical characteristics of quick-hardening concretes prepared based on activated cement; c) carrying out full-scale tests of the developed installation of the activator

Objectives

Methods

Results

Conclusion