Choon Wah Yuen

• Doctor of Philosophy
• Head of Department at University of Malaya

This study investigates the suitability of limestone aggregate sourced from the Sta’at quarry in Lundu, Sarawak, as a substitute for granite aggregate in concrete. The physical and mechanical properties of limestone and granite aggregates, along with their performance in concrete were evaluated following international and local standards. Both aggr...

Plain Language Summary The purpose of this study was to investigate how individual sociodemographic traits influence travel mode choices among urban residents in Klang Valley, Malaysia. The study collected data from 415 participants regarding their daily short trips. It discovered that men, individuals with lower education levels, students, and tho...

Given ever-increasing private transportation ownership, a rising population, and unceasing mobility, it is crucial to ensure the usage and improvement of public transportation services. Therefore, it is important to review and understand relationships between variables affecting ridership to boost them. This paper acts as a preliminary data analysi...

Prediction of bus travel time is a key component of an intelligent transportation system and has many benefits for both service users and providers. Although there is a rich literature on bus travel prediction, some limitations can still be observed. First, high-frequency and low-frequency bus routes have different characterizations in both operati...

Mixed-use developments (MXDs) are a single development project that integrates and interacts with different land uses. Traffic is estimated to be reduced with such development. However, there is no standard procedure is available to estimate the MXD trip generation rates in Malaysia. The Malaysian Trip Generation Manual (MTGM) is the guidelines cur...

Electric vehicles (EVs) have been progressing rapidly in urban transport systems given their potential in reducing emissions and energy consumptions. The Shared Free-Floating Electric Scooter (SFFES) is an emerging EV publicized to address the first-/last-mile problem in travel. It also offers alternatives for short-distance journeys using cars or...

Lightweight cementitious composite (LCC) produced by incorporating lightweight silica aerogel was explored in this study. Silica aerogel was incorporated as 60% replacement of fine aggregate (sand/crushed glass) in producing the LCC. The effect of aerogel on the drying shrinkage and alkali-silica expansion of LCC was evaluated and compared with tho...

The use of recycled concrete aggregates (RCA) for porous asphalts is a viable attempt towards waste management and sustainable conservation of natural resources. Installation of a porous asphalt wearing course is justified in highway pavements because it offers higher skid resistance, glare reduction, lesser traffic noise, reduction of hydroplaning...

Recycling of concrete aggregates in asphalt pavement surfacing is a viable solid waste management strategy. This study evaluated the strength and environmental performance of asphalt mixtures containing different proportions of Recycled Concrete Aggregates (RCA) for road pavement surfacing. Laboratory experiments and environmental life cycle assess...

This research involves a preliminary study of high calcium fly ash (HCFA) geopolymer and exploring the potential for textile reinforced mortar (TRM) application. The properties of the HCFA geopolymer added with styrene-butadiene rubber (SBR) were compared with normal cement mortar. The performance of HCFA geopolymer TRM in flexural strengthening of...

Increase in urban population across the globe has resulted in drastic rise in anthropogenic activities and urban surface modifications. These contribute to the hike of urban temperature above the temperature of surrounding rural areas. When this happens, the city is said to experience Urban Heat Island (UHI). This paper presents a review of availab...

Service quality is a significant concern for both providers and users of public transportation. It is crucial for transit agencies to clearly recognize the causes of unreliability before adapting any improvement strategy. However, evaluation of main causes of bus service unreliability has not been investigated well. Existing studies have three main...

This research proposes the use of a basalt textile-reinforced mortar (TRM) system as an overlay to strengthen brick masonry. A comparison of the strength performances, namely, the compressive strength, flexural bond strength, and shear bond strength, between unreinforced brick assembly and basalt TRM–reinforced brick assembly was made. The reinforc...

Bus services naturally tend to be unstable and are not always capable of adhering to schedules without control strategies. Therefore, bus users and bus service providers face travel time variation and irregularity. After a comprehensive review of the literature, a significant gap was recognized in the field of public transportation reliability. Acc...

Utilisation of recycled concrete aggregates (RCA) for highway pavement construction has been a sustainable attempt towards conservation of the natural resource base as well as mitigation against the environmental problems associated with harmful solid waste disposal. The performances of asphalt mixtures with 20%, 40%, 60%, 80% and 100% of coarse gr...

Highway pavements are very expensive infrastructures that consume very high amounts of natural resources. Utilisation of recycled concrete aggregates (RCA) for highway pavement construction can bring a number of benefits towards environmental, economic and societal sustainability. This would reduce the carbon footprint of the construction industry,...

The level of bus running time variation depends on various factors. This study employs automatic data collection systems (ADCS) to evaluate the variation in running time. The results proved that longer distances between key stops, experience of the driver and effective supervision at the terminals can significantly reduce the variation.

Light Rail Transit (LRT) is one of the sustainable transports which is highly promoted by Malaysian government with the intention to ease traffic congestion. However, it is observed that a few of LRT stations in Klang Valley are underutilised and have lesser amount of user. Location of the stations should not be a reason for this as they are usuall...

This research strives to develop a high-temperature resistant lightweight aggregate (LWA) mortar skin layer for use in sandwich concrete composite. The first phase of the research was focused on the development of the LWA mortar while the subsequent phase of work dealt with assessing the performance of the resulting sandwich concrete composite. In...

This paper explored the factors influencing commuter’s preferences of using park and ride (PnR), by investigating their travel mode choice behaviour, and assessing the effectiveness of PnR facilities. Binary logistic regression (BLR) was used to develop travel mode choice model which provides insight into commuter’s considerations contributing to t...

In order to reduce the dependency on virgin materials for construction, efforts have been made to incorporate by-products and wastes from different industries as alternatives in concrete. Originating from the fishery industry, seashell waste, such as oyster shells, mussel shells, and scallop shells, among others, is available in huge quantities in...

The utilization of recycled coarse aggregates (RCA) from construction and demolition wastes to produce green concrete serves as a sustainable solution with manifold environmental benefits. This study aims to widen the potential uses of RCA to fabricate pervious concrete for non-structural applications. The mechanical and surface properties, permeab...

Since 2012, the government has been promoting the electric vehicles and the development of related infrastructure to encourage local automakers to explore into the alternatively powered vehicles. However, the benefits of grid-dependent EVs can only be harvested under the condition that their use is coupled with a low carbon electricity grid. Thus,...

The decrease in density of lightweight aggregate concrete (LWAC) leads to the economic savings in terms of structural design, transportation and handling costs. LWAC exhibits better insulation properties and resistance towards earthquake effects as compared to normal concrete. However, the use of higher content and better quality of cement paste in...

This paper focuses on the study of the change of various types of riding behaviour, such as speed, brake force, and throttle force applied, when they ride across the speed table. An instrumented motorcycle equipped with various types of sensor, on-board camera, and data logger was used in acquiring the traffic data in the research. Riders were inst...

Motorcyclists are considered a very vulnerable group of road users as far as road accidents are concerned. Safety of this form of transportation is an important issue. This paper details the study on the changes in riding behaviour, such as changes in speed as well as brake force and throttle force applied, when motorcyclists ride over a curve sect...

This paper details the study on the changes in riding behaviour, such as changes in speed as well as the brake force and throttle force applied, when motorcyclists ride over a curve section road using an instrumented motorcycle. In this study, an instrumented motorcycle equipped with various types of sensors, on-board cameras, and data loggers, was...