Farahiyah Abdul Rahman
Thumbnail Image
Preferred name
Farahiyah Abdul Rahman
Official Name
Farahiyah, Abdul Rahman
Alternative Name
Abdul Rahman, Farahiyah
Main Affiliation

Research Output

Filters

3
2 1
Reset filters

Settings
Now showing 1 - 3 of 3
Thumbnail Image
Publication

Mechanical performance of Fly Ash based Geopolymer (FAG) as road base stabilizer

2022 , Liyana Ahmad Sofri , Mohd. Mustafa Al Bakri Abdullah , Andrei Victor Sandu , Thanongsak Imjai , Petrica Vizureanu , Mohd Rosli Mohd Hasan , Mohammad Almadani , Ikmal Hakem Ab Aziz , Farahiyah Abdul Rahman

This study examines the strength development of fly ash-based geopolymer (FAG) as a stabilizer for road base material for pavement construction. In the last decade, there has been a rapid development of conventionally treated bases, such as cement-treated bases. However, a major problem with this kind of application is the shrinkage cracking in cement-treated bases that may result in the reflection cracks on the asphalt pavement surface. This study explores the effects of FAG on base layer properties using mechanistic laboratory evaluation and its practicability in pavement base layers. The investigated properties are flexural strength (FS), unconfined compressive strength (UCS), shrinkage, and resilient modulus (RM), as well as indirect tensile strength (ITS). The findings showed that the mechanical properties of the mixture enhanced when FAG was added to 80–85% of crushed aggregate, with the UCS being shown to be a crucial quality parameter. The effectiveness of FAG base material can have an impact on the flexible pavements’ overall performance since the base course stiffness directly depends on the base material properties. As a stabilizing agent for flexible pavement applications, the FAG-stabilized base appeared promising, predicated on test outcomes.

View
Thumbnail Image
Publication

Statistical Analysis of Accident Patterns and The Causes at A State Road in Perlis

2023-01-01 , Doraisamy G. , Farahiyah Abdul Rahman , Afizah Ayob , Rani H.A. , Ibrahim M.K.A. , Harnaeni S.R.

According to data from the World Health Organization, approximately 1.3 million road users are at high risk of road traffic accidents every year. This study aims to assess accident patterns and causes on a state road between Kangar and Alor Setar. The evaluation of accident pattern employed include the chi-squared test (CST) and the level of service (LOS) survey. Analysis using Pearson CST reveals that age and vehicle type are significant factors in accidents. Specifically, individuals below 30 years old have a higher likelihood of being involved in accidents (ρ = 0.037), while motorcycles are more prone to accidents (ρ = 0.000). However, gender does not appear to impact accident involvement significantly (ρ = 0.911). The LOS E category indicates unstable traffic flows during Monday and Friday evenings. To evaluate accident causes from the perspective of road users, a questionnaire was used, and its validity and reliability were ensured through a pilot study. Four hypotheses were developed, examining human factors, vehicle factors, environmental factors, and road condition factors as independent variables. The results reveal that a majority of road users (33.3%) travel 1 to 3 times per week, with 23.1% of them being involved in accidents on this road. The validity test using the structural model identifies road factors (t = 6.166, ρ = 0.000), vehicle factors (t = 4.3399, ρ = 0.000), and human factors (t = 2.893, ρ = 0.005) as the most significant contributors to accidents. Hence, it is crucial for authorities to prioritize countermeasures focusing on these factors to reduce accidents on this road.

View
Thumbnail Image
Publication

Perspective of Construction Building Professionals on Low-Carbon Materials in Malaysia

2023-01-01 , Mohd Rohim Omar , Afizah Ayob , Hamizah Mokhtar , Mohd Hafiz Zakaria , Hafnidar A. Rani , Nur Soleha Abdul Rahim , Farahiyah Abdul Rahman

Low-carbon (LC) materials and alternative technology must overcome various institutional policy and market constraints to gain greater acceptance in the construction sector. The primary impediments that must be addressed to build a viable and sustainable local construction sector are awareness and knowledge. To analyse the perspective on LC materials in the northern states of Malaysia, 93 companies were surveyed via their construction building professionals (CBPs) on awareness, usage frequency, user experience, drivers for material selection and barriers to LC material adoption in projects. To establish an understanding of CBPs and LC materials, survey data were analysed using semi-structured qualitative-quantitative approaches and the Statistical Package for the Social Sciences (SPSS), influenced by basic theory. 79.57% valid responses indicate that most participants had a low degree of awareness, with 95% confidence that there is no difference in the score levels of the overall viewpoints between architects, civil engineers and structural engineers. While unfired bricks (16.2%) are commonly and widely employed in construction projects, structural insulated panels (40.9%) are the most favourable LC materials for future projects. Client requirements, regulatory requirements and expectations of a shorter completion time are the most important factors driving CBPs to select LC materials, accounting for 44.6%, 37.8% and 37.8%, respectively. According to the CBPs, the main constraint factor to market acceptability is the “Lack of sustainable material information” (44.9%). The proposed recommendations include “Training on designing a building with LC material”, “Clear regulation on limiting carbon emission in a project” and “Increase demonstration of projects and case studies” at a rate ranging from 36.5% to 43.2% to improve client and CBPs acceptance of LC materials for a more sustainable building sector.

View