A Study on the Construction Waste Forecasting Method Considering Material Loss Rate in South Korea

2014 ◽  
Vol 905 ◽  
pp. 187-190 ◽  
Author(s):  
Rak Hyun Kim ◽  
Sung Ho Tae
Keyword(s):  
South Korea ◽  
Loss Rate ◽  
Construction Materials ◽  
Material Loss ◽  
Construction Waste ◽  
Forecasting Method

With the purpose of proposing a construction waste forecasting method specialized for construction phase, this study suggested a forecasting method based on material loss rate to forecase construction wastes with diverse properties. Loss rate of 124 construction materials found in South Korea and Japan was provided. Also to review applicability of construction waste forecasting method using material loss rate, the amount of construction waste found using existing construction waste forecasting method and forecasing method proposed in this study was comparatively analyzed on apartment houses.

scholarly journals Construction Waste Reduction through Application of Different Structural Systems for the Slab in a Commercial Building: A South Korean Case

2021 ◽  
Vol 11 (13) ◽  
pp. 5870
Author(s):  
Seunguk Na ◽  
Seok-Jae Heo ◽  
Sehee Han
Keyword(s):  
Carbon Dioxide Emissions ◽  
Influencing Factor ◽  
Construction Materials ◽  
Waste Reduction ◽  
Structural Systems ◽  
Waste Generation ◽  
Commercial Building ◽  
Material Loss ◽  
Construction Waste ◽  
South Korean

Construction waste generation along with the extensive consumption of natural resources has propelled researchers to investigate effective measures for minimising the waste. While several studies have shown that the structural design would be an influencing factor on the carbon dioxide emissions of a building, there is a lack of studies to corroborate the effect of different structural systems to generate waste during the construction stage. This article seeks to bridge some of the knowledge gaps regarding the waste generation from different structural systems during the construction phase in a building project in South Korea and demonstrate its potential for waste reduction. In this study, the amount of waste generation during the construction phase was calculated based on the quantities and the material loss rate of each building material to estimate the quantity of construction waste by the changes in the application of different structural systems for the slab of the studied model. The total waste generation during the construction phase of the different slab systems shows that the solid slab system produces the largest amount of construction waste, which is 101,361.385 kg. On the other hand, the void slab system generates 87,603.958 kg of the construction waste, which is the lowest amount among the four variables of this study. The additional purchasing costs due to the loss of construction materials indicate that the solid slab system would require 80,709.76 USD, which is the highest value of the four variables in this study. The void slab system would cost USD 50,054.12 for additional materials purchasing costs, which is approximately 38% lower than the solid slab system.

Trowelable Rubber Rocket Insulation for Use at 2800°C

1984 ◽  
Vol 57 (4) ◽  
pp. 843-854 ◽  
Author(s):  
J. G. Sommer
Keyword(s):  
Room Temperature ◽  
Loss Rate ◽  
Service Temperature ◽  
Material Loss ◽  
Blowing Agent ◽  
Unusual Combination ◽  
Novel Approaches ◽  
Glass Microballoons ◽  
Burning Propellant ◽  
Intense Heat

Abstract Ablative, trowelable rocket insulation was prepared; it crosslinks at room temperature and self-bonds to prevulcanized NBR insulation. The material loss rate (MLR) of this insulation is low when it is tested by an oxyacetylene torch at temperatures of about 2800°C. Boric acid in the insulation causes an effective char to form at service temperature. This char slows the loss rate of nondegraded insulation beneath it. Density of this nondegraded insulation is 1.3 g/cm3. Density is reduced sharply to 0.8 g/cm3 by incorporating glass microballoons. They cause only a slight increase in MLR of the insulation at service temperatures. MLR can be significantly reduced by incorporating a blowing agent which decomposes only after the insulation is exposed to service temperature. Hence, an unusual combination of requirements is met by several novel approaches. This insulation has protected rockets as large as 6.6 meters in diameter from the intense heat of burning propellant in service.

Experiment and Optimization of High-Efficiency Mechanical Separation of Peanut Seedlings and Residual Film Based on Suspension Velocity

2021 ◽  
Vol 64 (4) ◽  
pp. 1381-1389
Author(s):  
Fengwei Gu ◽  
Meng Yang ◽  
Zhichao Hu ◽  
Yanhua Zhang ◽  
Chong Zhang ◽  
...  
Keyword(s):  
Moisture Content ◽  
Rotational Speed ◽  
Loss Rate ◽  
Removal Rate ◽  
Performance Tests ◽  
Test Results ◽  
Material Loss ◽  
Validation Test ◽  
Residual Film ◽  
Forage Utilization

HighlightsAn efficient method for separating peanut seedlings and residual film harvested from film-mulched peanut was proposed, and the mechanism was optimized.The relationships between the suspension velocity and moisture content of different shredded materials were studied.Four-factor, three-level Box-Behnken experiments were carried out and analyzed, and the optimal parameter combination was determined.A validation test was carried out to verify the rationality and accuracy of the optimized regression model.Abstract. To address the problems of lower residual film removal and higher material loss in the forage utilization of peanut seedlings wrapped in residual film, this study explored the relationships between the suspension velocity and moisture content of different shredded materials derived from peanut seedlings and conducted performance tests and parameter optimization for a machine that uses peanut seedlings as forage material. Four-factor, three-level Box-Behnken experiments were designed using the rotational speeds of the shredding shaft, upper fans, and lower fans and the frequency of the vibrating sieve as test factors, and using the residual film removal rate and material loss rate as response values. The test results indicated that the suspension velocity of the shredded materials showed a quadratic relationship with moisture content. The performance tests showed that the significance sequence of the test factors for the residual film removal rate was: rotational speed of the lower fans, rotational speed of the upper fans, rotational speed of the shredding shaft, and frequency of the vibrating sieve. The significance sequence for the material loss rate was: rotational speed of the lower fans, rotational speed of the shredding shaft, frequency of the vibrating sieve, and rotational speed of the upper fans. The parameter optimization and validation test showed that the residual film removal rate was 92.71% and the material loss rate was 8.19% when the rotational speeds of the shredding shaft, upper fans, and lower fans were 1650, 770, and 665 rpm, respectively, and the frequency of the vibrating sieve was 4 Hz. The relative errors between the validation test results and the predicted values from the regression models were less than 3%, which suggests that the regression models are reliable. This study provides a reference for the forage utilization of peanut seedlings harvested from film-mulched peanut and provides a reference for determining the optimal working parameters of forage processing machines. Keywords: Agricultural machinery, Box-Behnken experiment, Optimization, Peanut film-seedling separation, Suspension velocity.

scholarly journals Public Services in Construction Sector and Waste Management in SR

2020 ◽  
Vol 9 (2) ◽  
pp. 29-35
Author(s):  
Ivana Lichnerová ◽  
Eleonóra Marišová
Keyword(s):  
Waste Management ◽  
Public Interest ◽  
Slovak Republic ◽  
Construction Materials ◽  
Municipal Waste ◽  
Basic Material ◽  
Construction Sector ◽  
Construction Waste ◽  
State Administration ◽  
Provision Of Services

AbstractThe issue of public interest is regulated by the legislation of the Slovak Republic, which addresses services provided in the public interest in specific fields. One of these areas is also the provision of services in the construction sector, while these competencies were transferred by the Act no. 416/2001 Coll. from the state administration to self-government - municipalities and each municipality became a building authority. The problem, however, is that mostly small building offices have existential problems with the performance of this delegated competence, as the basis of their existence - financial resources for this competence- are insufficient. The way out of this unfavourable situation in this case could be the adoption of new legislation consisting of legally defined seats of joint building offices. When investigating the construction competencies of municipalities, we also encounter a solution for waste management (since it is also one of the competencies transferred to municipalities, but only partially). Municipalities are burdened by insufficient legislative specification of sorting biodegradable municipal waste from mixed municipal waste and subsequently an alternative in practice - waste sorting by citizens themselves. The population is dissatisfied with the amount of the fee for the collection and removal of municipal and small construction waste. In order to avoid paying fees for the storage of small construction waste, municipal residents export it to black dumps, which is in conflict with the EU and Slovak legislation in the field of waste management, whereas this type of waste can be the basic material for new, especially construction, materials.

Factor Analysis of Construction Waste in Riyadh Metro Project, KSA

2021 ◽  
Vol 39 (10) ◽  
Author(s):  
Raja Khan Mohammed Gopang ◽  
Qadir Bux Alias Imran Latif
Keyword(s):  
Factor Analysis ◽  
Material Handling ◽  
Construction Material ◽  
Construction Materials ◽  
Waste Generation ◽  
Construction Waste ◽  
Five Factors ◽  
Material Procurement ◽  
The Government ◽  
Metro Project

Development of the infrastructure is favorable for the growth and economy for any country; however, the issues to manage construction waste due originating from development exercises is a noteworthy reason for concern. The waste from construction contributes to negative repercussions on time, cost, productivity, and environment. Therefore, to reduce these negative and undesirable effects, a detailed review of waste generation and management must be provided. The significant construction waste causes were identified and grouped into seven clusters: construction management, design, construction material procurement, construction material handling, construction site condition, and external factor. A total of 150 questionnaire survey forms were distributed to professionals working on the Riyadh metro project, and only 118 questionnaire forms were received. The collected data from the questionnaire is analyzed using the average index and factor analysis. Analysis identified that ‘Design errors; ‘Accidents; ‘Damage during handling’; ‘Communication problems; ‘Frequent variation orders’ ; ‘Congestion of the site’ and ‘Damage caused by workers’; are highest significant causes in each category respectively. Furthermore, factor analysis was conducted through Exploratory Factor Analysis (EFA) technique to the top fifteen (15) factors and found five factors responsible for the construction waste was identified such as management, workers issues, material related issues, improper handling, and design. The findings from this study are useful for policymakers to develop or/and enhance recommendations on construction waste generation to prevent problems in construction industries. The government or building industry should establish or strengthen regulations that regulates how construction materials should be disposed of.  

scholarly journals Construction Waste as a Resource in a Sustainable Built Environment

2020 ◽  
Vol 2020 (08) ◽  
pp. 28-36
Author(s):  
Martina Zbašnik-Senegačnik ◽  
Ljudmila Koprivec
Keyword(s):  
Life Cycle ◽  
Built Environment ◽  
Building Materials ◽  
Waste Treatment ◽  
Raw Materials ◽  
Construction Materials ◽  
Raw Material ◽  
Sustainable Construction ◽  
Construction Waste ◽  
Key Factor

The built environment requires ever-increasing amounts of raw material resources and at the same time bears the responsibility for the resulting waste. Waste is generated throughout the life cycle. In the initial phases it is referred to as industrial waste, while during construction, reconstruction, and demolition it is called construction waste. Construction waste is most voluminous but it also has a great potential in circular economy that aims at the closed loop cycle where already used construction materials and components are recovered as raw materials. Sustainable building principles include four basic strategies, waste avoidance, construction materials and components re-use, continued use, and recycling. The possibility of construction waste treatment and its possible recovery in the building process depends on the type of prevailing materials that are contained in building elements as well as on detachability, separability and inseparability of structural joints and components. The architect plays a responsible role in decreasing the volume of construction waste as the conception of a building represents the key factor in sustainable construction waste management. Planning a construction with a good dismantling potential at the end of the building’s life cycle includes a number of factors such as the choice of building materials with a low environmental impact, the design of detachable composite materials and structures as well as the design of mono material structures. This article focuses on waste resulting from the built environment and discusses architectural concepts with a potential of reducing the volume of construction waste and its potential recovery as a construction resource.

scholarly journals Modern biopositive technologies of waste processing in the utilities and construction industries

Vestnik MGSU ◽  
2020 ◽  
pp. 1135-1146
Author(s):  
Konstantin L. Chertes ◽  
Nikolay I. Shestakov
Keyword(s):  
Asphalt Concrete ◽  
Waste Water Treatment ◽  
Construction Materials ◽  
Research Literature ◽  
Municipal Sewage ◽  
Waste Processing ◽  
Engineering Structures ◽  
Sedimentation Stability ◽  
Construction Waste ◽  
Wide Range

Introduction. In this article the analysis of certain biopositive technologies applied to processing or recycling of construction waste, municipal sewage, and paste-like slurries of organo-mineral nature is performed. The relevance of this research is confirmed by the steadily growing number of publications and currently implemented government programmes aimed at solving such problems. The paper summarizes the results of research into the treatment of wastes having different origin. Materials and methods. The analysis of the research literature and patents for inventions, as well as publicly available technologies used in waste processing and recycling is performed. Selection of biopositive technologies based on the chemical nature of materials and their groups is described. Biopositive technologies, most effectively applied to construction materials, are identified for the purpose of converting engineering structures into secondary raw components. The co-authors demonstrate the application of a biopositive technology to sludge decontaminated at municipal waste water treatment plants and to hot waste generated by the hydrolysis industry, as well as technologies used to process special thermal insulation and waterproofing materials. Results. The use of water-organic emulsions as active components in effective regeneration of asphalt granulated concrete mixtures is considered. Сompositions, concentrations and sedimentation stability of such emulsions have been identified. The results of the study of physical, mechanical and hydro-physical properties of the asphalt-concrete granulate treated with water-organic emulsions are described. This regeneration technology helps bitumen to restore binding properties on the surface of the asphalt-concrete granulate and makes this composite applicable as a material designated for the bottom layers of the road pavement. Conclusions. These biopositive technologies make it possible to efficiently and rationally process or recycle a wide range of municipal and construction waste into structures and products having various applications. Recycling, composting and plasma technologies are considered in this case.

Increasing the Capacity of Concrete Column with Integrated Permanent Formwork Using Wood-Wool Cement Board

2013 ◽  
Vol 325-326 ◽  
pp. 1305-1309 ◽  
Author(s):  
Nursafarina Ahmad ◽  
Zakiah Ahmad ◽  
Azerai Ali Rahman ◽  
Hanizah Abdul Hamid ◽  
Mohd Azrizal Aziz Fauzi
Keyword(s):  
Compressive Strength ◽  
Failure Modes ◽  
Construction Materials ◽  
Concrete Column ◽  
Construction Technology ◽  
Construction Waste ◽  
Permanent Formwork ◽  
Technology Process ◽  
The Cost ◽  
Cement Board

Growing construction activities requires increase in construction materials. The conventional method of constructions results in a rise in construction waste. Formwork as a main factor to generate construction waste has been the topic of investigation. The permanent formwork has been introduced with the aim to: promote the construction technology process that put quality, safety and environment issues into account, reduce the cost of workers and reduce the overall time of construction project. At present the permanent formwork available in the market are made from steel, and plastic and the cost is still high. Therefore this study is looking at the potential of commercial wood-wool cement board (WWCB) as permanent formwork. A series of concrete columns were constructed with and without integrated WWCB with different configurations of WWCB as permanent formwork. These columns were subjected to axial load and the compressive strength and failure modes were recorded. The results show that the present of permanent formwork from WWCB improves the compressive strength of the column. With the permanent formwork, the size of concrete column can be reduced and able to support the same load as column without permanent formwork. Therefore this construction method can reduce the overall cost of construction.

scholarly journals A Fuzzy Logic Method for Lightning Prediction Using Thermodynamic and Kinematic Parameters from Radio Sounding Observations in South Korea

2012 ◽  
Vol 27 (1) ◽  
pp. 205-217 ◽  
Author(s):  
Bongjae Kuk ◽  
Hongil Kim ◽  
Jongsung Ha ◽  
Hyokeun Lee ◽  
Gyuwon Lee
Keyword(s):  
Fuzzy Logic ◽  
South Korea ◽  
Probability Of Detection ◽  
Kinematic Parameters ◽  
Percent Correct ◽  
Fuzzy Logic Algorithm ◽  
Critical Success ◽  
Radio Sounding ◽  
Forecasting Method ◽  
Fuzzy Logic Method

Abstract Lightning is one of the most troubling weather phenomena for weather forecasters at space centers. In this study, proximity sounding and lightning data were used to evaluate the utility of thermodynamic and kinematic parameters for forecasting lightning prior to launch operations. Various parameters from 4138 radio sounding observations at five sites and cloud-to-ground (CG) stroke data from the Korea Meteorological Administration’s Lightning Detection Network (KLDN) over South Korea during 2004–09 were used. To support launch operations, forecasts of the total membership function for lightning (TMF) were derived from the combination of membership functions of selected thermodynamic and kinematic parameters with each objective weight using a fuzzy logic algorithm. The forecast skill of TMF was evaluated by computing several skill statistics, which include probability of detection (POD), false alarm rate (FAR), percent correct (PC), critical success index (CSI), and the true skill statistic (TSS). The lightning forecasting method for Gwangju, South Korea (site nearest to the Naro Space Center), was found to have a POD of 0.68, an FAR of 0.45, a PC of 0.76, a CSI of 0.44, and a TSS of 0.47.

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