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Ismail Abdul Rahman

Universiti Tun Hussein Onn Malaysia

Author-ID : 2411919

Earth & Planetary Sciences Environmental Science Materials Science & Nanotechnology Mathematics Physics

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Analytical Model for Critical Impact Energy of Spalling and Penetration in Concrete Wall Qadir Bux alias Imran Latif; Ismail Abdul Rahman; Ahmad Mujahid Ahmad Zaidi; Kamran Latif; Aftab Hameed; Sasitharan Nagapan
International Journal of Advances in Applied Sciences Vol 1, No 2: June 2012
Publisher : Institute of Advanced Engineering and Science

Penetration is the basic element of designing protective concrete structure against the local impact of hard projectile. Conventional, un-conventional, and sensitive structures should have to be designed as self-protective structures in order to resist natural disaster, consciously engendered unpleasant incidents, or/and against accidently occur incidents in nuclear plants, local industries etc.. When hard projectile collides with concrete wall, it is the critical impact energy of the projectile that deforms concrete wall. Critical impact energy is the dominant cause of penetration in concrete structures. Therefore, it is vital to study critical impact energy that causes penetration. An analytical model is developed to predict the required critical impact energy for spalling and tunneling and maximum penetration without rear effects in concrete walls when it is impacted with hard projectile. The newly developed analytical model is examined for CRH =2.0, 3.0. It was found that the predicted results from analytical model are in close relation with experimental data with less than (8%) and (17%) error in case of CRH =2.0 and 3.0. Furthermore, Chen and Li nose shape factor is modified as (Ni), with introduction of empirical frictional factor (Nf). It was found that the predicted results from analytical model with proposed nose shape (Ni) are in close relation with experimental data in all cases as compared to predicted results with traditional Li and Chen nose shape (N*). In general, the analytical model generates encouraging prediction which is consistent and follows a general trend of experimental results. Therefore, it is suggested that the proposed analytical model is conservative.

Factors Contributing to Physical and Non-Physical Waste Generation in Construction Industry Sasitharan Nagapan; Ismail Abdul Rahman; Ade Asmi
International Journal of Advances in Applied Sciences Vol 1, No 1: March 2012
Publisher : Institute of Advanced Engineering and Science

Construction industry has been developing rapidly around the world. This development increases pressure especially in developing countries to manage construction wastes generated from the industry. The construction wastes can be grouped into physical and non-physical waste and it has impact to environment, economy and social of a country. Before it can be managed well, it is crucial to understand the root causes of the generation. This paper identifies factors that contribute to the generated construction waste. Mapping technique was adopted to extract the physical and non-physical waste factors from 30 research articles around the world. It was found 81 factors exist in construction activities which are directly contributing to waste generation. These factors are grouped into seven categories: Design, Handling, Worker, Management, Site condition, Procurement and External factor. From these factors, 63 contribute to physical waste and 73 contribute to non-physical waste. The highest frequency scored in each category of physical and non-physical waste factor is identified and explained with examples. These findings give awareness to construction stakeholder about the existence of physical and non-physical waste contributory factors.

Time and Cost Performance in Construction Projects in Southern and Central Regions of Peninsular Malaysia Aftab Hameed Memon; Ismail Abdul Rahman; Ade Asmi Abdul Azis
International Journal of Advances in Applied Sciences Vol 1, No 1: March 2012
Publisher : Institute of Advanced Engineering and Science

Time and cost performance is the fundamental criteria for success of any project. Unfortunately construction industry in Malaysia has been regarded as industry facing poor performance leading to failure in achieving effective time and cost performance. As a consequence most of the project face huge amount of time and cost overrun. This study assessed the time and cost performance of construction projects in Malaysia using structured questionnaire survey. The findings of study revealed that 92% of construction projects were overrun and only 8% of project could achieve completion within contract duration. The amount of time overrun was in between 5-10% as agreed by respondents. In terms of cost performance only 11% of respondents mentioned that normally their projects are finished within the budgeted cost while 89% of respondents agreed that their projects were facing the problem of cost overrun with average overrun at 5-10% of contract price. The major contributors of this poor performance include design and documentation issues, financial resource management and project management and contract administration issues. Further, qualitative study was carried out using semi-structured interviews with the experience personnel involving in managing construction project which resulted in developing 13 mitigation measure to improve time performance and 15 mitigation measure to improve cost performance in construction project. This study will help the practitioners to implement the mitigation measure at planning stage in order to achieve successful construction projects.

The Way Forward in Sustainable Construction: Issues and Challenges Jamilus Md Hussin; Ismail Abdul Rahman; Aftab Hameed Memon
International Journal of Advances in Applied Sciences Vol 2, No 1: March 2013
Publisher : Institute of Advanced Engineering and Science

Construction industry is one of the most significant industries that contribute toward socio-economic growth especially to developing countries. The nature of the industry are fragmented, unique and complex which always face chronic problems like time overrun (70% of projects), cost overrun (average 14% of contract cost), and waste generation (approximately 10% of material cost). It is also regarded as one of the largest polluters to our environment. Traditional practices of construction process and management are found unable to control unprecedented challenges including the carbon emission issue. These challenges accent the need for practitioners to rethink and improve the construction process and technology. This shows that the construction industry has a major potential in the advancement of sustainable development by addressing issues related to the economic, social, and environment. By adopting sustainable construction, it can reduce the overall energy use and maximize potential for renewable energy supply, minimize waste, conserve water resources, enhance water quality, incorporate water sensitive design and minimize vulnerability to flooding, minimize polluting emissions to water, air and soil and minimize noise and light pollution.

Co-Authors Ade Asmi Ade Asmi Abdul Azis Aftab Hameed Aftab Hameed Memon Ahmad Mujahid Ahmad Zaidi Jamilus Md Hussin Kamran Latif Qadir Bux alias Imran Latif Sasitharan Nagapan Sasitharan Nagapan

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