Journal of Construction Research
EISSN : 2630-5089
Published by: Bilingual Publishing Co. (10.30564)
Total articles ≅ 37
Latest articles in this journal
Journal of Construction Research, Volume 4; https://doi.org/10.30564/jcr.v3i2.4042
Indoor Air Quality (IAQ), particularly in educational facilities, is gainingconsiderable interest and is a synonymous indicator towards evaluatinghuman comfort. Factors such as CO2 concentration, temperature, andhumidity play crucial parts in determining an acceptable level of IAQ.Many studies have also demonstrated that the indoor air quality ofclassrooms affects students’ concentration and performance. Today withthe threat of a global pandemic, the demand of clean & fresh indoor airquality in education buildings is extremely intensive. This study focuseson investigating IAQ situations and changes in different typical functionalspaces of a higher education building in the UK. CO2, temperature, andhumidity data in various learning environment were monitored via dataloggers during the winter. Associated with data monitoring, a set ofquestionnaires surveys were carried out to evaluate the user’s experience.The results of this study show that temperature and CO2 concentrationin the classrooms was constantly higher than the government guidanceon a daily basis. The analysis also shows that temperature and humidityincreased with CO2 levels, but at a much lower rate. This study hasrevealed poor and concerning IAQ in higher education buildings in the UK,particularly in larger rooms with high occupancy. Along with the findings,this paper also identifies possible impact or factors and proposes solutionsto overcome these issues.
Journal of Construction Research, Volume 3, pp 19-26; https://doi.org/10.30564/jcr.v3i2.4075
Through the systematic analysis of the ground settlement generatedby the process of shield tunneling, the relationships between grounddeformation and construction parameters are studied in this paper. Basedon the assumption of linear small deformation, a mathematical model ofthe relationship between ground deformation and construction parametersis set up. The principle and method of optimization for estimating grounddeformation is studied. The actual measured data are compared with theresults of theoretical analysis in a case. Considering different groundformations in different construction sites with different adverse effectson surface and underground structures, the ground surface deformationscaused by shield tunneling is an aimed topic in this paper. The contributionsand research implications are the revealed relationships between the grounddeformation and the shield tunneling parameters during construction.
Journal of Construction Research, Volume 3, pp 56-62; https://doi.org/10.30564/jcr.v3i2.4137
Buildings are designed to offer protection to the occupants against harshoutdoor environment thereby enhancing optimal indoor comfort. Overthe years, there have been a rise in population of students applying foradmission into tertiary institution, which has led to an increase in thenumber of students that resides at the university hostel. These rise in thenumber of students, has brought about overcrowding and stretching offacilities, with spaces which were originally intended for four students arenow been habited by six to eight students thereby causing imbalance inthe general indoor climatic condition. The study is aimed at investigatingthermal comfort in student’s accommodation in tertiary institutionstowards achieving a better thermal condition in the hostel environment.The objective is to evaluate the thermal performance in the student hostelaccommodation, and also to identify passive ways of controlling thermalperformance in student dwelling buildings at Federal University ofTechnology Minna main campus, Gidan Kwano. For the purpose of thisresearch work, primary data were collected through the use questionnaire,case studies and observation. Secondary data were collected from availableliterature, internet, and studying of similar existing facilities. The studyrevealed that most student hostel possessed few elements of passive coolingtechnique which in turn deprives students a quality conducive environment.The research recommends that soft landscaping elements should be adoptedand deciduous trees planted in the environment for cooling effect duringhot and humid period, provision of two openings in each room if possible.This can be achieved through proper building orientation, use of highthermal mass to reduce heat absorption, use of high thermal mass withnight cooling, roof, ceiling and attic insulation. Designing in a hot climatearea requires lots of consideration, which is mentioned above so as toincorporate a general conducive indoor thermal comfort for the users.
Journal of Construction Research, Volume 3, pp 1-18; https://doi.org/10.30564/jcr.v3i2.4071
This paper is based on a scientific methodology developed by its author(1987) in his doctoral dissertation and later (2004) published in a book.According to this methodology, architecture is understood as a systemconsisting of four basic elements: Environment, Man, Boundaries andPerspectives. As a case study, this methodology was checked and confirmed(in the dissertation and in the cited book) on the example of an orientaltype town hall in Bosnia and Herzegovina, Serbia, Montenegro, Kosovoand Macedonia, and later in all published books, to date.In this paper, the author draws attention to the element of Perspective (inarchitecture) thus emphasizing its exceptional importance in understandingarchitecture as a whole. In doing so, this element cannot be separated fromthe other three elements (Environment, Man, Boundaries) since with themhe builds architecture as a single whole.
Journal of Construction Research, Volume 3, pp 27-42; https://doi.org/10.30564/jcr.v3i2.4106
Earlier research works on fire risk evaluation indicated that an objective,reliable, comprehensive, and practical fire risk evaluation model is essentialfor mitigating fire occurrence in building construction sites. Nevertheless,real empirical studies in this research area are quite limited. This journalpaper gives an account of the second stage of a research study aiming atdeveloping a fuzzy fire risk evaluation model for building construction sitesin Hong Kong. The empirical research findings showed that the overall firerisk level of building construction sites is 3.6427, which can be interpretedas “moderate risk”. Also, the survey respondents perceived that “Restrictionsfor On-Site Personnel” is the most vital fire risk factor; with “Storage ofFlammable Liquids or Dangerous Goods” being the second; and “Attitudeof Main Contractor” the third. The proposed fuzzy fire risk evaluationmodel for building construction sites can be used to assess the overall firerisk level for a building construction site, and to identify improvementareas needed. Although the fuzzy fire risk evaluation model was developeddomestically in Hong Kong, the research could be reproduced in othernations to develop similar models for international comparisons. Suchan extension would provide a deeper understanding of the fire riskmanagement on building construction sites.
Journal of Construction Research, Volume 3, pp 43-48; https://doi.org/10.30564/jcr.v3i2.4157
On-time completion of road infrastructure projects is a critical goal. Whenprojects were not completed on schedule and real construction progress isslower than expected, the inconvenience and disruption to business accessincreases. On time completion is linked to economic and social welfare,as well as safety. Construction delays continue to be a typical occurrence,despite the need of prompt completion.A literature study is conducted in this context in order to learn more aboutthe causes and factors that contribute to delays. Following a thoroughreview of the literature, it was determined that a questionnaire survey isthe most effective and trustworthy way for gathering information about thecauses and quantifying delays caused by emergent factors. The RelativeImportance Index (RII) method was used to analyze the data, and thereasons for the delay were prioritized according to their importance. Thisstudy focuses on the emergent concerns/causes and reasons of concernin road infrastructure projects, as well as how to priorities these issuessequentially during the planning stage. This study survey can assistconstruction companies doing business in India in understanding theessential or sensitive issues that require special attention in order to conducttheir businesses smoothly in this country while employing appropriateproject management practices.
Journal of Construction Research, Volume 3, pp 49-55; https://doi.org/10.30564/jcr.v3i2.4049
Concrete is the most generally used construction material in buildings,pavements, and infrastructures. Concrete is a construction materialcomposed of cement as binder, fine aggregates and coarse aggregatesmixed with water which hardens with time. Concrete is a versatileconstruction material within the housing industry of the planet. Thestandard of the concrete is tormented by various factors and from thosevarious factors which may have an effect on the concrete quality are, thecoarse combination size has its own nice role on the standard of concreteproduction. A laboratorial experiment was conducted to work out the resultscoarse aggregates size on recent and hardened concrete properties. For thisstudy totally different crushed volcanic rock aggregates sizes were collectedfrom almost Jimma city for determination of the results of coarse aggregatesizes in concrete production. Three coarse aggregate nominal sizes of 10mm, 14 mm and 20 mm were used for samples production to envision thescale effects on concrete properties. For this study the procedures that wasfollowed, the types and quantity of materials for concrete creating weresimilar whereas sizes of nominal basaltic coarse aggregate were different.The fresh concrete has a slump value of 67 mm, 72 mm and 83 mm for10mm, 14 mm and 20 mm aggregate sizes respectively. A total of thirty sixconcrete cube samples were ready and tested using compressive strengthtesting machine at totally different ages of the cube 7 days, 14 days, and 28days, to know their strengths. The compressive strength was 23.524 Mpa,22.643 Mpa and 22.41 MPa for aggregate sizes of 10 mm, 14 mm and 20mm respectively. The laboratory results show that 10mm coarse aggregatesize gave the most effective compressive strength and comparativelylowest slump at similar water/cement ratio of 0.6. At 28th day 10mmcoarse aggregate size gave 23.524 Mpa compressive strength which is themaximum compressive strength from the remainder coarse aggregates so,the optimum maximum size of coarse aggregate for this study was 10mm.
Journal of Construction Research, Volume 3; https://doi.org/10.30564/jcr.v3i1.3262
Weak soils, such as soft clay and loose sand, have a poor bearing capacity, making them incapable of bearing the load of superstructures that will be imposed on them. As a result, engineers must have a solution to the issue of poor bearing capacity in weak soils before embanking into building on them. This paper reviewed the use of stone columns, piled rafts, and geogrids for improving the bearing capability of weak soils. Important findings from recent research are also discussed. From the review of the previous researcher’s findings, it was found that modelling approaches such as physical modelling (full scale, centrifuge, laboratory scale) and numerical modelling are used to study bearing capacity improvement.
Journal of Construction Research, Volume 3; https://doi.org/10.30564/jcr.v3i1.3079
Wood and fly ash were observed to have significant qualities that could improved the strength of self compacting concrete, the material were applied to increase the compressive strength of concrete strength, this material could be the demanding material for partial replacement for cement, the study observed the behaviour of the material from experts that applied these material through experimental investigation, but the study monitored the behaviour of this material by applied modeling and simulation to determine other effect that could influence the behaviour of this materials in compressive strength, this was to determine the significant effect on the addictive applied as partial replacement for cement, lots of experts has done works on fly ash through experiment concept, but the application of predictive concept has not be carried out, the adoption of this concept has expressed other parameters that contributed to the efficiency of wood and fly ash as partial replacement for cement on self compacting concrete. The study adopting modeling and simulation observed 10 and 20% by weight of cement as it is reflected on its performance in the simulation, from the simulation wood recorded 10% as it was observed from the growth rate of this self compacting concrete reflected from the trend, the simulation for model validation were compared with the works of the studies carried out . And both values developed best fits correlation
Journal of Construction Research, Volume 3; https://doi.org/10.30564/jcr.v3i1.3081
This paper monitors the growth rate of tensile strength under partial replacement of locally sourced materials, the study monitor the behaviour of tensile between seven and twenty eight days of optimum curing age, modeling and simulation were applied in the study, whereby parameters that generate the attained tensile strength from self compacting concrete were monitored considering various factors such as variation of compaction and water cement ratio, the reaction of these parameters were examined in the study through the simulation, the reflection of these parameters influence where observed in all the trend, the study examined the level of significances of tensile on concrete structure, therefore try to evaluate various reflection effect from permeability and other parameters that were not considered in experimental process, these are developed from self compacting concrete partially replace cement with fly ash and wood. Tensile strength is an important property of concrete due its level of vulnerability to tensile cracking base on different kind of applied loading itself. The influence of permeability as a physical property has definitely affect the durability of concrete, these where observed on the its reflection on tensile strength in all the trend, the rate of permeability effect on tensile were monitored to reflect its reaction through microstructural perspective influence from porosity, pore size, connectivity including its rates of bonding, these correlation includes air content and capillarity, there rate of permeability coefficient on its reduction are determined by the decrease in porosity and void ratios from concrete compaction rate, it is reflected on its variation of tensile strength in self compacting concrete, the rate of permeability reducing at constant rates determined the tensile strength through it microstructural setting on the self compacting concrete, these condition were applied on the simulation to generates the predictive values compared with experimental values by an expert , while an improvement were made on it study, these include monitoring of concrete permeability and void ratios effect on tensile, the behaviour of porosity under the influence of permeability and variation concrete void were examined from the permeability influence on tensile strength.