Abstract
Abstract. Huge amount of recycled concrete is formed when dismantling of buildings. The paper describes an efficient application of recycled concrete aggregates and concrete grinding fines to obtain technological, economic and ecological benefits. The possibility of effective application as materials for self-compacting concrete with the use of crushed concrete and recycled concrete fines is shown. The use of filler in self-compacting concrete mixtures obtained by activation of concrete grinding fines with polycarboxylate-based superplasticizer is shown. This paper presents the results of research of self-compacting concrete produced with recycled concrete aggregates and activated filler. The physical and mechanical characteristics of coarse aggregate, grain distribution of aggregates and sand proportion in aggregate mix, design of self-compacting concrete mixture and its structure properties with use mathematical experiment planning method were carried out. This method applies in the design of the self-compacting concrete mixture by solving the system of equations. The equations obtained by corresponding mathematical models. The obtained mathematical models include argumentative characteristics defined by the end of structure formation. The optimal content of filler in self-compacting concrete mixture is determined. The optimal grinding mode of the equipment with specified specific surface area of the filler is obtained. The grain-size composition of mixture consisting of quartz sand and crushed concrete aggregate with fraction of 5-10 mm based on term of maximum approximation to the Fuller ideal gradation curve is designed.
Highlights
Huge amount of recycled concrete is formed when dismantling of buildings
The paper describes an efficient application of recycled concrete aggregates and concrete grinding fines to obtain technological, economic and ecological benefits
The use of filler in self-compacting concrete mixtures obtained by activation of concrete grinding fines with polycarboxylate-based superplasticizer is shown
Summary
В статье приводиться методика подбора состава самоуплотняющегося бетона на основе продуктов дробления бетонного лома с использованием математических методов моделирования путем решения системы полученных уравнений соответствующих математических моделей. В качестве исходных материалов для самоуплотняющегося бетона может служить щебень из дроблёного бетона и отсев его дробления. В течение последних лет широкое применение получили исследования свойств бетонов с применением вторичных заполнителей из бетонного лома не только в России, но и во всем мире [4, 5, 6]. Имеется опыт применения крупного заполнителя на основе дробленого бетона не только в обычных вибрированных бетонах [14, 15], но и в самоуплотняющихся, получивших широкое распространение в последние десятилетия [16]. Основываясь на данных условиях, а также используя структурные характеристики бетона, авторами статьи была разработана методика определения состава самоуплотняющегося бетона на основе бетонного лома. В работе применялись следующие виды материалов: портландцемент ЦЕМ I 42,5Б, ПАО «Мордовцемент»; кварцевый карьерный песок с модулем крупности Мк=1,8 ЗАО «Мансуровское карьероуправление» с гранулометрическим составом, представленным в табл. 1
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