Current Issue : July - September Volume : 2017 Issue Number : 3 Articles : 5 Articles
Construction industry is one of the significant contributors to the economic\ngrowth and development of Cambodia. Two major challenges are limiting\nthe performance of the construction industry in Cambodia, which are poor cost\nand schedule performance of the construction projects. Therefore, the aim of this\nstudy is to fill an important knowledge gap by identifying the various attributes\nfor construction project delay, using the residential building projects as a starting\npoint. Feedback from a survey administered to the contractors and consultants\nwas analysed using Relative Importance Index (RII). Results showed that shortage\nof materials on site; unrealistic project scheduling; late delivery of material; shortage\nof skilled labour; complexity of project; labour absenteeism; late payment by\nthe owner for the completed work; poor site management; delay by subcontractor;\naccidents due to poor site safety are ranked by the contractors and consultants as\nthe main causes of project delays in Cambodia. Construction frontline players are\nrecommended to put their efforts on the identified key factors in relation to their\nmagnitudes of influence. By doing so, the causes of project delays in the Cambodia�s\nconstruction and real estate sector could be significantly reduced or controlled,\nwhich will ultimately lead to the on time project completion.\nSubjects: Construction Management; Building Project Management; Construction Business\nManagement...
The ongoing undertaking of construction industrialization in China is redefining the industry\nand creating a new era for building construction. In order to identify the construction industrialization\nstatus and progress, a national survey is conducted across 19 key provinces and municipalities in China.\nBased on the collected data, construction industrialization is analyzed from various perspectives:\n(1) the industrialized building floor area is profiled using maps with colours showing the different\nlevels of construction industrialization in China as of 2014; and (2) structural types and building\ntypes are analyzed for industrialized construction, and it is found that reinforced concrete is\nthe predominant structure type, accounting for 77.1% of total floor area of industrialized construction\nin 2014. The industrialization trends are also predicted for the following five years using Holt�s\nand Delphi method. This research reveals the status and the promising trends of construction\nindustrialization in China....
To increase the heat capacity in lightweight construction materials, a phase change material (PCM) can be introduced to building\nelements. A thermally activated building system (TABS) with graphite/PCM concrete hollow core slab is suggested as an energy efficient\ntechnology to shift and reduce the peak thermal load in buildings. An evaluation of heat storage and dissipation\ncharacteristics of TABS in graphite/PCM concrete has been conducted using dynamic simulations, but empirical validation is\nnecessary to acceptably predict the thermal behavior of graphite/PCM concrete. This study aimed to validate the thermal behavior\nof graphite/PCM concrete through a three-dimensional transient heat transfer simulation.The simulation results were compared to\nexperimental results from previous studies of concrete and graphite/PCM concrete.The overall thermal behavior for both materials\nwas found to be similar to experiment results. Limitations in the simulation modeling, which included determination of the indoor\nheat transfer coefficient, assumption of constant thermal conductivity with temperature, and assumption of specimen homogeneity,\nled to slight differences between the measured and simulated results....
The construction waste has been produced more and more with the rapid development of urbanization and\nindustrialization in China in recent years. The waste clay brick of construction waste named recycled coarse\naggregate was mixed with cement concrete mainly by making laboratory experimental study. The clay brick as\nrecycled coarse aggregate was mixed into the concrete at 0%, 20%, 25%, 30 %, 35%, 40%, 50%, 60%, 70%, 80%,\n100% and fixed water-cement ratio according to references at home and abroad, which made the C30 standard test\nblocks, and strictly controlled the variable of the coarse aggregate replacement rate; the slump and 7-day compressive\nstrength were measured, and their performance was compared with that of the standard C30 concrete specimen; the\noptimum range of incorporation of recycled aggregate would be put forward according to their performance. This\nresult would have a certain significance in waste bricks....
Lightweight steel-framed (LSF) construction, given its advantages, has the potential to reach\nhigh standards in energy and environmental performance of buildings, such as nearly zero-energy\nbuildings (nZEB). When compared with traditional construction, LSF system offers distinct benefits\nin such fields as sustainability, cost-effectiveness, constructive process, and safety at work. Despite\nthe benefits of this constructive system, the effect of thermal bridges in LSF elements, caused by the\nhigh thermal conductivity of the steel structure, can be a disadvantage. The excessive heat losses or\ngains through these thermal bridges are more relevant in buildings� exterior envelope, such as facade\nwalls. These building components� thermal performance is crucial in the buildings� overall energetic\nbehaviour, with a direct impact on energy consumption and resulting monetary costs during their\noperational stage. In this work the influence of the thermal insulation position on its effectiveness is\nevaluated in LSF facade walls. For this purpose, several LSF wall types are assessed, namely cold,\nwarm, and hybrid construction. The influence of thermal bridges instigated by the steel studs in the\nLSF walls� overall thermal performance is evaluated as well. The computations are performed using\nspecialized finite element software (THERM)....
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