Special Issue 1(5) 2018
Chief Guest Editor
Dr. Muhamad Azry Khoiry
Dr. Aizat Mohd Taib, Dr. Irfana Kabir Ahmad
Jurnal Kejuruteraan-SUTRA (Journal of Engineering- SUTRA) provides forum for the publication of papers in innovative and collaborative interdisciplinary researches and applications towards energy, environment and smart living. Research areas involved in this edition are geotechnics, structures and materials, transport, and the environmental engineering. Full length papers, reviews and short communications are welcomed, on subjects such as experimentation (both techniques and data), new theoretical models, commentaries work and letters to the editor.
Table of Contents
|1.||Application of Microscopic Techniques for Studying Microstructure of Concrete Containing Lightweight Aggregate
Nur Fatihah Halim, Muhamad Razuhanafi Mat Yazid* & Mukhlis Nahriri Bastam
The reason for failure in engineering component can be attributed to design deficiencies, poor selection of materials, manufacturing defects, exceeding design limits and overloading, and inadequate maintenance. The behaviour of material depends on the chemical, physical, mineralogical, microstructure characteristics and the interaction between them in the concrete. The aim of this research is to investigate some of the properties on the concrete that is containing the lightweight expanded clay aggregates (LECA). Study the microstructure of concrete be able to understand the relationship between structure and behaviour of concrete. Interaction inside the phase of concrete such as dislocations, grain boundaries, phase interfaces, pores and crack can be identified by a microstructure of concrete. Therefore, a microstructure of concrete has been studied under a digital microscope. The properties of LECA were investigated in order to relate the behaviour of aggregate in the concrete. LECA were used in the production of lightweight aggregate concrete (LWAC) with the size 50 mm × 50 mm × 50 mm. The results show that LECA has several improvements when compared with normal crushed aggregate. The density of LECA was 520 kg/m3 and its characteristics were round, rough and porous. Besides that, the LWAC shows an excellent strength development, 29.41 MPa compared than normal weight concrete (NWC), 25.57 MPa. The surface of LWAC was darker than NWC due to LWAC experience more hydration of ferrite compound. In addition, the microstructure investigation of the LWAC shows a good bonding between aggregate and mortar at the interface transition zone (ITZ).
Keywords: Lightweight expanded clay aggregates; Digital microscope; Interface Transition Zone
|2.||The Effectiveness of Swale Drainage in Terms of Pollutant Removal and Rate of Infiltration
Nafahatul Qayyimah Shammizi & Siti Fatin Mohd Razali*Abstract
Swale drainage is a broad and shallow drainage that is able to filter runoff before flowing to the main drain and river. This study is focused on the effectiveness of the swale drainage compared to concrete drainage, in terms of pollutant removal and its relationship with the infiltration rate. The chosen site is at Astaka field, in Selangor.
Keywords: Swale; Water runoff; Pollutant removal; Infiltration rate
|3.||Motorist Compliance Level towards Pedestrian Crossing in University Campus
Siti Khairunisa Zainal, Muhamad Nazri Borhan*, Mardhiah Othman
A pedestrian crossing is a facility designated for pedestrians to cross a road in groups, so that they can be seen by the motorists. Pedestrian crossing is also used by them to cross safely across a flow of vehicular traffic. However, accidents still occur among pedestrians even though there are provisions for pedestrian crossing facilities. The purpose of this research is to identify the level of motorists’ compliance towards pedestrian crossing at Universiti Kebangsaan Malaysia (UKM) which is located in Bangi, Selangor. This research involved 326 respondents among motorists and pedestrian that comprised of UKM’s undergraduate and postgraduate students. This research aims to measure and analyse the level of compliance and the importance of motorists, pedestrian, facilities and maintenance factors using the Importance Performance Analysis (IPA) method. The data were analysed by using the Statistical Package for Science Social (SPSS) 22. The results of IPA were divided into four quadrants where some of the factors must be improved by UKM’s authority and some must be maintained. From the IPA analysis, it was concluded that the street lightings must be improved and upgraded by UKM’s management as the attribute lies on Quadrant 2 where Quadrant 2 represents the attributes that need to be prioritised, so that accidents between motorists and pedestrians can be avoided.
Keywords : Pedestrian crossing; Motorist; Universiti Kebangsaan Malaysia; Importance Performance Analysis
|4.||Auditing Road Maintenance Work using Unmanned Aerial Vehicle
Aimi Nadira Mohd Safie, Khairul Nizam Abdul Maulud*, Othman Jaafar
Road maintenance works performed by contractors require validation upon completion. Conventional methods are typically chosen to validate the works. Geographic Information System (GIS) is applied in this study to produce accurate data such that waste from road maintenance costs can be minimised. In this study, Unmanned
Keywords: Road maintenance works; Validation; Geospatial; Unmanned Aerial Vehicle (UAV)
|5.||Validation of Numerical Modelling Techniques in Unsaturated Slope Behaviour
Aizat Mohd Taib*, Mohd Raihan Taha
Knowledge in modelling unsaturated slope behaviour remains limited. Research findings have challenged the common assumption of fully saturated conditions for all soil problems thus widening the perspective of partially saturated states. The calibration of unsaturated soil parameters requires good understanding of the soil-water
Keywords: Unsaturated slope; Groundwater flow; Factor of safety; Plaxis.
|6.||An Application of Capacitance Proximity Sensor for Identification of Recyclable Materials
Irfana Kabir Ahmad*, Siti Nur Hidayah Harun, Mohd Reza Azmi
Capacitive proximity sensor is often used in various industrial applications for contactless measurement of an object or target displacement and position. In this research, the capacitive proximity sensor is used for new alternatives in detecting recyclable materials specifically plastic and paper for aiding in the separation process. The detection of the sensor for this study is based on the permittivity values of each material where the sensor is adjusted according to the tested material permittivity. Several experiments have been conducted using different types of papers, plastics, and a combination of both materials for this study. At the end of the experiment, the sensor is able to detect a different type of paper and plastic. The sensor also able to detect the combination of both paper and plastic based on their difference in permittivity values. However, there are some limitations to this system such as the size, density, permittivity values, as well as the distance between both sensor and target are affecting the accuracy of the detection system causing the sensor to fail in identifying the samples.
Keywords: Capacitive proximity sensor; Permittivity; Detection; Recyclable
|7.||Traffic Impact Assessment on a New Commercial Development in the Neighbourhoods of Ampang Town in Selangor
Amiruddin Ismail* & Nursyahirah Surianis MokhtarAbstract
Traffic impact assessment (TIA) on a proposed commercial development in the neighbourhoods of Ampang Town in Selangor was conducted. In this study, trip rate analysis and regression analysis were carried out to assess future traffic expected to be generated by the proposed new commercial development. Calculations of trips were based on the Malaysian Highway Planning Unit (HPU) Trip Generation Manual (TGM) Malaysia 2010 related to a category of proposed new commercial development. Before and after construction study on the proposed new commercial development at neighbouring critical intersections and roads was carried out to determine existing and projected traffic volumes. A Statistical Package for the Social Sciences (SPSS) software was used to analyse traffic growth rate. This procedure uses a growth factor in the traffic data to show an increase in demand for transport journeys in the future. Then, intersections and roads traffic performances were analysed using the Signalised and Un-signalised Intersection Design and Research Aid (SIDRA) software. Result of SIDRA analysis with traffic projection horizon of year 2026 shows deterioration in Level of Service (LOS) D at one of the existing main junctions leading to the proposed new commercial development. Finally, traffic improvements were proposed to address future impact of generated traffic caused by the proposed new commercial development. Consequently, this study has provided a framework for TIA preparation and would assist developers and local authorities in their decision making to meet all the requirements needed in the design and improvement of traffic flow.
Keywords: Traffic impact assessment; Regression analysis; Trip rates; Level of service
|8.||Effective Use of Indigenous Microorganism (IMO) in Composting a Mixture of Food and Yard Wastes on an Industrial Scale
Farishya Kamaruzzaman, Shahrom Md Zain*, Nur Fatin Mat Saad, Hassan Basri, Noor Ezlin Ahmad Basri
The aim of this research is to determine the performance of effective microorganisms (EM) in the composting of mixed food and yard wastes on an industrial scale. Composting parameters such as temperature, moisture content, pH, and the carbon to nitrogen ratio (C:N), as well as the maturity of nitrogen, phosphorus and potassium (NPK), were determined. For this purpose, the type of EM used to accelerate the composting process is Indigenous Microorganism (IMO). The study, which was conducted using the best EM, accelerated the composting process, wherein it only takes approximately 13 weeks for the decomposition process to occur in each heap. The results show that the final temperature for each heap is between 25.57 and 28.03 ͦ C, the percentage of moisture content is between 45.55 and 60.49%, the pH is between 6.81 and 7:41, the ratio of carbon to nitrogen is between 17:1 and 23:1, the NPK value for nitrogen ammonia is between 0 mg/L and 0.56 mg/L, the potassium content is between 2.25 and 3.25 ppm, and the value of phosphorus is between 0.56 and 0.76 ppm. Based on these results, it can be concluded that the quality of the compost produced for all piles is high. Due to the slight differences in parameters between all piles, the effectiveness of EM IMO was not conclusive for either open or closed aerated piles, and further research needs to be done.
Keywords: Effective Microorganism (EM); Indigenous Microorganism (IMO); Composting; Yard Waste; Food Waste
|9.||Ultimate Load Behaviour of Steel-Concrete Composite Plate Girders with Inclined Stiffeners
Mohd Reza Azmi*, Mohd Yazmil Md. Yatim, Wan Hamidon Wan Badaruzzaman, Irfana Kabir Ahmad, Mohd Hafiz Mohd Zawawi
This paper focuses on the ultimate load behaviour of steel-concrete composite plate girders with inclined stiffeners. For this research, non-linear modelling and analyses were carried out on ten simply supported composite plate girders using a commercial finite element software, LUSAS. The girders are of practical design size and subjected to a single concentrated load applied at the centre of the girder span. Effects of different inclination angles of intermediate stiffeners and web-depth to thickness (d/t) ratios on the post-buckling behaviour of the girders are investigated. Five different angles of stiffeners, measured from the bottom flange, were considered in the research, viz., 90°, 75°, 60°, 45° and 30° while the web thickness, tw used in this study are 2 mm and 3 mm. With the effects of such inclinations, the variations of ultimate load, load-deflection response and failure characteristics were obtained. The load carrying capacity was found to rise significantly of about 32%, as the angle of inclination reduced from 90° to 30°. The ultimate strength of the composite girder also shows a maximum increase of 28%, when the web thickness, tw rises from 2 mm to 3 mm.
Keywords: Composite girder; inclined stiffener; non-linear modelling; ultimate load behaviour; post-buckling
|10.||Engineering Properties and Impact Resistance of Kenaf and Rice Straw Fibres Reinforced Concrete
Muhammad Zulhamdi Abdul Mulok, Amirul Anwar Mohd Solong, Wan Nur Ain Nabila Wan Mat Ali, Roszilah Hamid*
Natural fibre reinforced concrete (NFRC) has been a subject of interest for research in the past few decades due to the many advantages of natural fibres such as abundantly available, lightweight, cheap, diverse and as reinforcement in composite, provide great energy absorption and good impact resistance to the composite. The purpose of this paper is to study the engineering properties (workability, compressive, flexural and split tensile strengths, and impact resistance of NFRC, particularly kenaf (K) and rice straw (RS) fibres. Both fibres are investigated to determine feasibility of using abundant waste (RS) instead of kenaf (planted) as natural fibre reinforcement in concrete for impact resistance application such as roof tiles. Samples consist of untreated kenaf and rice straw fibres, with different percentages by volume of cement (0, 1, 1.5, 2, 3, 4 and 5%), as concrete reinforcement. The slump, compressive, flexural, split tensile strengths, and impact resistance are determined in accordance to BS, ASTM and ACI codes of practice. Results show that, due to high rate of water absorption of rice straw fibre, reduction in workability and compressive strength of RSFRC can be observed compared to KFRC. Increasing the volume of RS fibre leads to high volumes of entrapped air after curing process, resulting in decrease of concrete strength. However, addition of both fibres as reinforcement, enhanced the flexural, split tensile and impact resistance of concrete at up to a certain volume fraction of fibres. The energy absorption of RAFRC at 2% is superior compared to other fibres, except only coir and exhibit better performance in resisting impact even though kenaf has superior properties compared to RA due to its higher ductility compared to kenaf.
Keywords: Natural fibre reinforced concrete; Kenaf; Rice straw; Mechanical properties; Impact resistance
|11.||Effectiveness of Masjid Lestari Program on Recycling Practices among Bandar Baru Bangi and Semenyih Residents
Tasnim Mohammad Mohsin, Noor Ezlin Ahmad Basri*, Shahrom Md. Zain, Tiew Kian Ghee
The government of Malaysia has implemented various measures to reduce disposal of daily solid waste to landfills including recycling. Based on the issue, the Universiti Kebangsaan Malaysia took the initiative to organise “Program Masjid Lestari” targeting to enhance recycling practices among the community. The objectives of this study are to identify factors that influence the behaviour of recycling practices in the community and to assess the effectiveness of the awareness programme, “Program Masjid Lestari”. “Program Masjid Lestari” focused on recycling practices among Bandar Baru Bangi and Semenyih residents took place in 2015, 2016 and 2017. The study applies survey instrument and also weight of recyclable items collected during the program. The questionnaires were distributed to the residents who had attended the event at Section 3 and Section 4, Bandar Baru Bangi and also Bandar Rinching, Semenyih. The survey data was analysed using Statistical Packages for Social Sciences (SPSS) version 23. Based on the findings, the total recyclable items collected during the program were 800 kg in 2016 and 878 kg in 2017 for Bandar Rinching, Semenyih. Most of the respondents have good knowledge, awareness and attitude towards recycling. However, the involvement of community in recycling practices is still low due to lack of facilities, time and cost constraints. In general, awareness campaigns are able to increase community involvement to recycle. A good advertising and promotion, appropriate time, location and improvement of facilities are the important factors to ensure a successful awareness program that could make an impact on the recycling practice.
Keywords: Recycle; Community; Awareness Program; Behaviour
|12.||Threshold Criteria of Sediment Motion for Biological Cohesive Sediment Mixture
Najwa Izzaty Muhammad Azha, Wan Hanna Melini Wan Mohtar*
Shields diagram is used as the main source to determine the incipient motion of sediment. However, incipient sediment motion in the Shields diagram was developed based on non-cohesive sediment where the parameter influencing the motion of cohesive and non-cohesive sediments are different. Therefore, this study attempts to investigate the incipient sediment motion for biological extracellular polymeric substance (EPS) influenced by a cohesive sediment mixture. Percentage of silt with a median grain size of 28μm (which acts as the cohesive material) and fine sand with of 150μm were varied as 10:90, 20:80, 40:60, and 50:50, which formed the cohesive sediment mixture. Two different concentrations of EPS 0.02% (which denotes as low concentration) and 0.1% (as high concentration) were well mixed with the sediment mixture. This study utilised Xanthan gum, which acts as a substitution for EPS. The experiments were conducted in a laboratory flume and the threshold criterion for sediment motion was obtained through observation. The critical Shields parameter θ_c was calculated using the critical shear velocity and root-mean-square horizontal velocity (representing turbulent fluctuations) when few of the particles on the bed was observed to move. Obvious finding from this study is the presence of EPS clearly influence the threshold criteria based on the higher value obtained at sediment mixture with 0.1% compared to the values found for the 0.02% EPS sediment mixture. The values of the critical Shields parameter were monotonously increased as the percentage of silt in the sediment mixture increases. The presence of silt in the sediment mixture increases the sediment stability signifying more hydrodynamic forces are required for the particles to be entrained. The critical Shields parameter obtained based on the critical shear velocity and turbulent fluctuations posed similar trend as described in the well-established Shields curve indicating that the velocity scale used to describe the incipient sediment motion is not a decisive factor.
Keywords: Incipient sediment motion; Silt-sand-EPS mixture; Biological cohesive sediment