Construction Waste Processing Research Articles

Layout Optimization of Construction Waste Recycling Facilities for Development of New Urban Areas from Centralized and Decentralized Processing Collaboration Perspective

The generation, treatment and safe disposal of construction waste have become major problems in new urban areas of China. And the existing research has not been carried out based on the recycling characteristics of scattered, low efficiency and large negative externalities of construction waste processing in the development of new areas. This research studies the optimal location of construction waste centralized and decentralized processing facilities based on the characteristics of the generation end and the demand side of new urban areas. Firstly, grey relational analysis method is used to determine the location of centralized processing facilities. Then, a multi-objective integer programming model is built by comprehensively considering cost, side effect on society and carbon emissions during transportation, and the optimal location and dynamic adjustment of decentralized processing facilities are determined. Finally, taking the development of a new area in China as an example, the network of construction waste recycling facilities is established to verify the effectiveness of this model. The research results show that the layout strategy formulated with this method can maintain the dynamic optimal layout of the system from the perspective of the whole region, and realize the utilization of construction waste with low cost, low transport carbon emission and low social negative impact. The analysis method system established in this paper is universal, which can provide reference for the relevant government departments to plan the construction waste recycling facility network of the area, and provide guidance for the investment decisionmaking and operation management of related enterprises.

Sustainable development of construction contractors of the Republic of Moldova in the context of waste generation and processing

The article deals with the formation and processing of construction waste resulting from the activities of construction organizations. Every year there is a growth in the volume of construction products, which leads, among other things, to an increase in the volume of generated waste. The aim of this scientific research is to study the preconditions of sustainable development of construction enterprises in the Republic of Moldova in the context of waste management. As a hypothesis, it was assumed that the scale of formation and processing of construction waste affects the profitability of contractors. The initial information for the research was the data characterizing the activity of the construction enterprises of the Republic of Moldova for the last 6 years. Methods of economic analysis and methods of correlation regression were used as research methods. The results of the correlation analysis showed that 99.27% of the profitability of sales of construction enterprises depends on the factors reflecting different aspects of waste formation and management, which makes it possible to directly create prerequisites for long-term and efficient management of construction waste.

Improvement of methods for organizing recycling during reconstruction of buildings and structures

The problems of utilization of construction waste during the reconstruction of buildings and structures are considered. The methodological approaches to the processing of construction waste are studied, including the recycling of products of processing of concrete and reinforced concrete, which is currently one of the most priority areas of business in the construction industry. As a possible project, a mini-plant was chosen - a crushing and screening complex DSK-48-13, offered by the Obukhov Scientific and Industrial Company of the city of Nizhny Novgorod. An analysis of the project for the construction of a mini-plant for the processing of construction waste DSK-48-13 in the Samara region was carried out. The rationality of using the products of processing of concrete and reinforced concrete is substantiated.

Recycling construction waste in real estate reproduction in the Russian Federation

This article discusses the main problematic aspects of the processing of construction waste, due to the growth in the volume of real estate. The purpose of the article is to analyze the efficiency indicators of the use of construction waste processing in the production of real estate objects. Based on this goal, the following tasks were set: identifying the main factors hindering the development of construction waste recycling and developing a general model of environmental and economic efficiency at the stage of recycling and processing.Research methods. The composition of the methods that ensured the conduct of this work included: methods of economic and mathematical modeling, analysis of expert estimates and initial retrospective analysis.Conclusions. The article presents the results of a study on the use of technologies for processing waste from the construction industry and shows the effectiveness of the economic and environmental provision of real estate. The authors proposed a scenario model for forecasting the development of the construction waste processing industry.

Creating incentives for managing construction waste generated during the war

The object of this study is a system of incentives aimed at activating the processes to manage construction waste formed during hostilities. The problem being solved is to form incentives for the growth of economic interest in construction waste management. The structural and functional readiness of the economy for the management of waste generated as a result of hostilities is investigated. It was revealed that 60 % of the participants in the waste management system are microenterprises with a profitability of 0.2 %. The level of construction waste disposal and the level of its reuse are estimated. Forecasts of the behavior of methods of waste management in the absence of changes in state policy have been made. Based on the use of forecasting methods, a trend of increasing the amount of waste dumped at landfills has been identified. The directions of state influence on the formation of economic incentives for the processing of construction waste have been proposed. A special feature of the study's results is that the inconsistency of existing incentives with the needs of participants in the field of waste management has been investigated. The problem with the activities of small enterprises is the demand for performance, at the formation of which government efforts should be directed. Distinctive features of the results are that they solve the problems of achieving a balance of economic interests of participants in the management of construction waste generated during the war. The area of practical use of the obtained results is the system of state and local management of waste handling activities

Establishment and Utilization Plans of Apartment Housing Envelope System Database

Recently, apart from the energy saving of new buildings, various carbon-centered environmental policies for climate change were implemented to improve the energy performance of existing buildings, actively promoting green remodeling businesses. This study proposed a classification system for green remodeling envelope systems to select the applicable representative method and input material for the green remodeling of apartment housing. The system boundaries were divided into the material production stage and construction waste processing stage, and the classification system of the envelope system was implemented for applicable green remodeling. A database for the environmental, economic, and energy performances of the classification system was created. Moreover, a green remodeling evaluation sheet system was proposed. According to our results, the economic, energy, and environmental performances of the proposed combinations of the insulation systems were higher than those of the reference combination by 30%, 10%, and 30%, respectively. Regarding the window systems, the economic and energy performances of the proposed input material combinations were higher than those of the reference combination by 22% and 10%, respectively. Additionally, the energy performance of the proposed input material combinations was higher than that of the reference combination by 8~64%.

Methods of organizing work on construction and demolition waste recycling

The research is aimed at finding new ways that contribute to environmental improvement. It is evident that there is a great need at the moment to find optimal methods of construction and demolition waste recycling while renovating urban areas. The researchers examine the recycling method which is characterized as one of the most effective ways to solve the problem of construction waste disposal. In this paper the authors resort to the method of comparison as well as to graphical, tabular, and abstract-logical methods. They analyze two main methods used to carry out recycling operations: the first method involves recycling waste at the site of construction using mobile crushing plants and the second involves recycling at stationary crushing and grading complexes. Then the authors point out advantages and disadvantages of these methods and examine the efficiency of a stationary complex. The researchers also calculate the prime cost of construction waste processing at a stationary crushing and grading complex and its payback period. It is concluded that the use of a stationary complex for construction and demolition waste recycling is technically and economically feasible.

Reorganization of Waste Management Scheme for Construction and Demolition

The subject of the study is the organization of waste management of construction and demolition in the context of large-scale urban programs for new construction and renovation. This work is aimed at analyzing the principles of organizing the processing of construction waste and forming a proposal for the modernization of functional and planning schemes for handling construction and demolition waste in the context of large-scale urban programs for new construction and renovation. The following materials and methods were used: normative and technical documentation, construction organization projects, a list of environmental protection measures developed as part of the project documentation of implemented capital construction projects; additive scientometric analysis, generalization and presentation of aggregate experimental data on aspects of waste management of construction and demolition. The analysis of the principles of organization of processing of construction waste is performed. The functional and planning scheme of a stationary unit for processing construction and demolition waste and creating (producing) finished products with the integration of construction waste to create materials and products for new construction and renovation is proposed. The future use of the proposed functional and planning schemes is focused on making correct organizational and technological decisions when preparing organizational and technological documentation for capital construction projects. The development and implementation of economically and technologically sound management schemes for construction waste plays a relevant role in achieving responsible consumption and production, as well as in ensuring the transition to rational management models.

Рециклинг вторичных строительных ресурсов. Проблемы и перспективы отрасли на примере г. Москвы

<span>В статье анализируется проблема утилизации отходов строительства и сноса в России, особенно актуальная в связи с активизацией проектов реновации жилого фонда и реализацией национальных проектов. Наиболее эффективным методом утилизации является рециклинг, т.е. переработка в качестве вторичных строительных ресурсов (ВСР), но по доле перерабатываемых строительных отходов (около 10% от их общего объема) Россия сильно отстает от развитых стран. На примере г. Москвы рассмотрены предварительные итоги начального этапа реновации ветхого жилого фонда и выявлены основные проблемы, негативно влияющие на эффективность и развитие отрасли по переработке строительных отходов. Главные из них</span><span class="myHorizontalScaleForEmDashSpaceBefore"> </span><span>–</span><span class="myHorizontalScaleForEmDashSpaceAfter"> </span><span>это недостаточная мощность существующих предприятий и сложность организации процесса сбора и сортировки отходов непосредственно на строительной площадке. С целью преодоления названных ограничений авторы предлагают блок-схему структуры и этапов комплексного рециклинга вторичных строительных ресурсов. Определены и рассмотрены основные экономически эффективные технологии переработки ВСР, которые перспективны для инвестирования в развитие малого и среднего бизнеса с использованием рыночных механизмов и государственного регулирования.</span>

Construction waste processing management and demolition of five-storey apartment blocks in Moscow

Data on waste processing management in waste processing technology. Processing of scrap concrete waste, similar in composition and condition to traditional raw materials, is economically and ecologically feasible. The research suggests that concrete with scrap concrete waste shows strength properties similar to primary concrete and helps organize waste-free production.The methods of waste recycled usage, especially, usage of secondary crushed stone made of crushed concrete scrap are becoming ever more relevant with every passing year. Imported concrete aggregate volumes can be reduced by 15-30% due to usage of secondary crushed stone. Consideration of industrial waste problem and methods of solving this problem by using waste in construction industry including secondary crushed stone made of crushed concrete scrap.Annually, about 11.5 million tons of construction waste is generated in Moscow, in the near future concrete scrap volumes are expected to rise to 13-15 million tons per year because of building demolition, reconstruction, overhaul and piling of reject structures.One of the problems in modem development in the production of concrete and reinforced concrete parts and products is a matter of replacing the traditional scarce raw materials while maintaining the placeability of the concrete mix and strength of the finished products. The use of industrial waste similar in terms of composition and condition of traditional raw materials unquestionable from economic and environmental point of view. Studies show that concrete, using from fine granulated blast furnace slag as cement additives, have higher initial strength characteristics of concrete.

Waste diminution in Construction projects: Environmental Predicaments

Waste diminution in construction projects is not only a behavioural issue, but also an energy consumption and reduction concern. With construction waste equating to the significant amount of exhausted energy together with increased pollution, this contributes to a series of environmental predicaments. The overall goal of construction solid Waste Management is to collect, treat and dispose of solid wastes generated by project activities in an environmentally and socially satisfactory manner, using the most economical means available. As cities expand, their construction activities and consumption patterns further drive up the solid waste quantities. Governments are usually authorized to have responsibility for providing solid Waste Management services, and various administrative laws give them exclusive ownership over the waste produced. In addition, construction waste processing can be further controlled and minimized according to specialized authorities such as Environmental Protection Agencies (EPA) and their relevant acts and regulations. Moreover, a Construction Environmental Management Plan (CEMP) can further control the treatment of waste and therefore, reduce the amount produced. Key elements of a CEMP not only include complying with relevant legislation, standards and guidance from the EPA; however, also to ensuring that there are systems in place to resolve any potential problems associated with site activities. Accordingly, as a part of energy consumption and lessening strategies, this paper will discuss various effective waste reduction methods for construction projects. Finally, this paper will also examine tactics to further improve energy efficiency through innovative construction Waste Management strategies (including desirability rating of most favourable options) to promote the lessening of overall CO2production.

Modeling of construction waste processing system development

Construction waste is the most important source for reducing raw material resources. In this regard, many countries conduct large-scale research in developing progressive construction waste utilization technologies and creating highly efficient production equipment. Current experience in this field views the construction waste processing system as a number of interconnected subsystems: organizational and technical preparatory measures; waste collection and sorting; waste containerization, packaging and transportation; waste processing and manufacturing of recyclable resources. Each subsystem consists of a set of measures which characterize the change in material quality and properties. Modeling of the construction waste processing system addresses the task of assessing the actual level of the system and subsystems and determining the condition of the same within certain forecasted time perspectives. For this purpose, the cost vs. revenue comparison tools are used. To develop the construction waste processing system and maintain it in working condition it is important that, early on in the project, a waste classification catalogue and a relevant glossary of terms be compiled with all waste processing contractors having to agree to it and observe it. Also, a data bank containing all the relevant engineering and process documentation shall be drafted and maintained.

Construction waste processing management and demolition of five-storey apartment blocks in Moscow

Data on waste processing management is presented in the article. Processing of scrap concrete waste, which is similar to traditional raw materials in composition and condition, is economically and ecologically feasible. The research suggests that concrete with scrap concrete waste shows strength properties similar to primary concrete and helps organizing waste-free production.

Modeling of construction waste processing system development

Construction waste is the most important source for reducing raw material resources. In this regard, many countries conduct large-scale research in developing progressive construction waste utilization technologies and creating highly efficient production equipment. Current experience in this field views the construction waste processing system as a number of interconnected subsystems: organizational and technical preparatory measures; waste collection and sorting; waste containerization, packaging and transportation; waste processing and manufacturing of recyclable resources. Each sub-system consists of a set of measures which characterize the change in material quality and properties. Modeling of the construction waste processing system addresses the task of assessing the actual level of the system and subsystems and determining the condition of the same within certain forecasted time perspectives. For this purpose, the cost vs. revenue comparison tools are used. To develop the construction waste processing system and maintain it in working condition it is important that, early on in the project, a waste classification catalogue and a relevant glossary of terms be compiled with all waste processing contractors having to agree to it and observe it. Also, a data bank containing all the relevant engineering and process documentation shall be drafted and maintained

Experimental Studies on Basic Performance and Application of Self-Compacting Concrete Using Waste Brick Recycled Coarse Aggregate

With rapid economic development in China, the frequency of that new buildings replace old buildings increases gradually in rural areas, which inevitably results in the emergence of a large amount of waste clay brick. The processing of construction waste takes up a lot of land resources and worsen the existing rural environmental pollution situation. using waste clay brick to prepare recycled coarse aggregate concrete not only can effectively eliminate construction waste and reduce the consumption of original coarse aggregate and thus the cost of buildings, but also solves a series of environmental problems—it conforms to the concept of "green building" and stands in line with the strategic objectives of sustainable development. This paper researched on the influence of recycled coarse aggregate gradation and water cement ratio to the strength of recycled concrete at first, then experimentally verified the application feasibility of recycled coarse aggregate self-compacting concrete.

Construction WasteTreating Based on Urban Planning

During the construction of large-scale infrastructure in China, the construction waste becomes a major environmental problem hampered the development of urban. In this study, the treating models of construction waste were analyzed. A case study was implemented in Xiaoting district in Yichang. It was proposed that the treatment can be started from urban planning, including controlling the source of construction waste on macro, designing transportation route of construction waste reasonably, and establishing regional system of joint control points, and constructing the governance model which used "building garbage's disposal" as the core of corridor of industrial chain economy. Finally, a practical kind of urban construction waste processing means and method was put forward which can provide scientific basis for construction of low carbon city.

Web-based construction waste estimation system for building construction projects

This paper proposes a web-based construction waste estimation system (WCWES) for building construction projects incorporating the concepts of work breakdown structure, material quantity takeoff, material classification, material conversion ratios, material wastage levels, and the mass balance principle. The WCWES integrates online data input modules and online analytical modules for the quantification of different kinds of waste generated in the construction process at the project level. It facilitates accessibility, interfacing, connectivity and information sharing of users in carrying out a wide range of construction waste estimation tasks for sustainable construction waste management. A hypothetical building construction project is used to demonstrate the application and usefulness of the WCWES. • Developing a web-based building construction waste estimation system • Allowing online analytical processing of construction waste • Improving the estimation accuracy of construction waste • Allowing multi-dimensional analysis of construction waste

Recovery of Aggregates from Waste Concrete by Heating and Grinding

ABSTRACT This research virus carried put to recycle the aggregates in the waste concrete. The recycled aggregates below 25 mm produced by the company I. a construction waste processing company were divided into several pans. According as the particle size was decreased, the amount of cement mortar, absorption ratio and abrasion ratio of recycled aggregate were increased. When they were heated at 200~500°C and ground by ball mill, the amount of cement mortar separated from the recycled aggregates was increased according to increase in temperature. When the aggregates such as granite and gneiss were heated above 550°C, their compressive strength was declined for α-SiO2 contained in them was transformed into β-SiO2. Thus, the waste concrete was heated at 400~500°C and ground by ball mill for 1 hr not to deteriorate the aggregate in concrete. As a result, the specific gravity, the absorption ratio, and the abrasion ratio of the aggregates become above 2.5, below 3.0%, and below 40%.