Abstract
The presented paper is dedicated to the topical issue of utilization of screenings waste crushed concrete, which is produced as a result of crushing of waste materials, formed during dismantling buildings and facilities, and a production of fine aggregate concrete on its basis. The paper presented analysis of economic situation in the region and results of the study of screened waste materials in order to increase efficiency of an application of that product as fine aggregate and fine-ground active filler for a production of fine aggregate concretes. Particle size distribution, mineral and chemical composition of waste crushed concrete were studied, as well as features of their structure, taking into account heterogeneity of crushed material. Transitional zone of secondary aggregate and cement matrix was studied and it was proved, that the strength of adhesion with cement matrix of grains of that kind of secondary material, produced from screenings of waste crushed concrete, is significantly higher, than strength of the grain itself, which is indicative of an active influence of that aggregate on a formation of both characteristics of structure of cement matrix and dense transitional zone between them. Optimal composition of multicomponent binders, comprising fine-ground filler, produced from screenings of waste crushed concrete, is designed. Compositions and properties of cement matrix based on the designed binders are studied. Compositions of concretes, based on multicomponent binders with anthropogenic filler, are obtained and their strength and strain properties are studied.
Highlights
IntroductionIn the period from 1994 to 2002 as a result of military actions in the Republic of Chechnya, thousands of buildings and facilities, made of of brick, concrete and reinforced concrete were partially or completely destroyed (Figure1), which resulted in a formation of an extremely large number of anthropogenic raw materials in a form of debris of concrete, reinforced concrete and bricks (Bazhenov, et al, 2011; Lipey, et al, 1981; Murtazaev, & Ismailova, 2008).The highest portion of all wastes, formed during disassembly of buildings and facilities, consists of debris of brick, concrete and reinforced concrete, which currently are partially recycled at various crushing-and-sorting facilities (Zashkova, et al, 2008; Pazhani, & Jeyaraj, 2010; Yasuhiro, 2007)
Secondary gravel nowadays is becoming a serious alternative to traditional coarse aggregates .Waste crushed concrete screenings hadn't yet found a wide practical application in construction materials industry, because their composition and properties was not studied sufficiently, they are accumulated at crushing-and-sorting facilities (Kikuchi, et al, 1998; Yаnаgibаshi, et al, 2004)
The authors conducted analytical and experimental studies with an aim to improve efficiency of recycling of waste products, formed during dismantling of buildings and facilities, in a form of waste crushed concrete, reinforced concrete and brick, to reduce cost of composite construction materials based on secondary raw materials and to improve ecological situation in the region
Summary
In the period from 1994 to 2002 as a result of military actions in the Republic of Chechnya, thousands of buildings and facilities, made of of brick, concrete and reinforced concrete were partially or completely destroyed (Figure1), which resulted in a formation of an extremely large number of anthropogenic raw materials in a form of debris of concrete, reinforced concrete and bricks (Bazhenov, et al, 2011; Lipey, et al, 1981; Murtazaev, & Ismailova, 2008).The highest portion of all wastes, formed during disassembly of buildings and facilities, consists of debris of brick, concrete and reinforced concrete, which currently are partially recycled at various crushing-and-sorting facilities (Zashkova, et al, 2008; Pazhani, & Jeyaraj, 2010; Yasuhiro, 2007). In the period from 1994 to 2002 as a result of military actions in the Republic of Chechnya, thousands of buildings and facilities, made of of brick, concrete and reinforced concrete were partially or completely destroyed (Figure1), which resulted in a formation of an extremely large number of anthropogenic raw materials in a form of debris of concrete, reinforced concrete and bricks (Bazhenov, et al, 2011; Lipey, et al, 1981; Murtazaev, & Ismailova, 2008). The final product after crushing, refining and fractionation of that raw material is 70-75 % of secondary gravel and 25-30 % of screenings of crushed concrete (Murtazaev and Bataev, 2009, Dоshо et al, 1998). Secondary gravel nowadays is becoming a serious alternative to traditional coarse aggregates .Waste crushed concrete screenings hadn't yet found a wide practical application in construction materials industry, because their composition and properties was not studied sufficiently, they are accumulated at crushing-and-sorting facilities (Kikuchi, et al, 1998; Yаnаgibаshi, et al, 2004). Screenings of crushed stone significantly increase dust level of urban air, because stacks of the anthropogenic product contain 15-25 % or, possibly, more, www.ccsenet.org/mas
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