Afizah Ayob
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Preferred name
Afizah Ayob
Official Name
Afizah, Ayob
Alternative Name
Ayob, Afizah
Ayob, A.
Afizah, A.
Main Affiliation
Scopus Author ID
23767077500
Researcher ID
D-3484-2018

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Publication

Applications of waste material in the pervious concrete pavement: A review

2017-09-26 , Shahrul Azwan Shakrani , Afizah Ayob , Mohd Asri Ab Rahim

Pervious concrete pavement is one of the innovative structures designed in order to manage the quantity and quality of urban stormwater for a sustainable development. In general, pervious concrete pavement enables water to permeate through its structure and have a capability to cater dynamic loads at the same time. However, the conventional pervious concrete pavement lacks a superior strength while performing as pavement structure. Thus, an extensive research has been carried out in order to explore the possible materials to be incorporated into the pervious concrete pavement for better physical, structural and mechanical properties. The objectives of this paper are to review the waste materials used in the pervious concrete pavement along with their mechanical, durability and permeability performance.

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Physical properties of Dolomite fines as partially replacement of cement

2023-01-01 , Mustaqqim Abdul Rahim , Ivin C. , Norlia Mohamad Ibrahim , Shahidan S. , Afizah Ayob , Nor Faizah Bawadi , Shamilah Anudai @ Anuar , Zuki S.S.M. , Shamshinar Salehuddin

Since the cost of cement increases and the pollution to environment due to greenhouse effect are becoming more serious year by year, thus, dolomite fines subjected to replace the cement in concrete mix as it has lower cost compared to cement and it is obtain directly from the Earth ground without any manufactured process. Dolomite fines also shows almost similar physical and chemical properties as cement. The various replacement of cement with dolomite fines carried out in this study is 0%, 5%, 10%, 15% and 25%. The grade of concrete sample designed to be 30. The properties of concrete sample in terms of physical characteristics; slump, density and water absorption for various percentage replacement are determined in this study. In this study, it shows the dolomite fines are lightweight aggregate compared to the cement and the water absorption of is lower compare to that of the control concrete.

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Physical and mechanical properties of coconut shell concrete (CSC)

2021-07-21 , Mustaqqim Abdul Rahim , Cheah S.W. , Afizah Ayob , Norlia Mohamad Ibrahim , Shamilah Anudai @ Anuar , Nor Faizah Bawadi , Shahidan S. , Ahmad A.N.A.

The use of waste products as partial replacement for the material in concrete can help to reduce the environmental and economic problem. Coconut shell (CS) is one of the agricultural waste that suitable to use as and coarse aggregates replacement due availability of CS which not only can help to decrease the cost of the concrete and reduce the environmental problem, it also can maintain the properties of the concrete. In this study, the compressive strength of the concrete has been chosen to be investigated. Three different types concrete cube have been casted in this study; 0, 10%, 15%, 20% of CS to replace for coarse aggregates. The size of the cube samples to be casted is 100 x 100 x 100 mm and were cured for 7 and 28 days. The study shows that the optimum percentage for CS concrete is 10% due to in this percentage of replacement, it gives the highest compressive strength value compare to other percentage at 28 days.

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Mechanical, Durability and Rheology Properties of Ultra High Performance Concrete (UHPC) with Low Cement Content

2021-11-26 , Mohd Zulham Affandi Mohd Zahid , Bakar B.H.A. , Nazri F.M. , Alasmari H. , Latiff M.F.P.M. , Afizah Ayob , Khairunnisa Muhammad , Muhammad Munsif Ahmad , Manaf B.H.A. , Mokhzani Khair Ishak

This current study attempts to investigate the mechanical, durability as well as rheology properties of Ultra-High Performance Concrete (UHPC) with low cement content and using coarse aggregate. The cement content used in UHPC mix in current study was 800 kg/m3. The slump flow, compressive strength, splitting tensile strength, modulus of elasticity, water absorption and water penetration tests were conducted to determine the workability, mechanical and durability properties of explored UHPC mixture. The test results show that the above properties were exceptional and comparable with other UHPC mixtures.

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Physical behaviours of maximum loading and cracking for slurry infiltrated fibre reinforced concrete

2020-06-10 , Mustaqqim Abdul Rahim , Zahirah A. , Shahidan S. , Mohd Badrul Hisyam Ab Manaf , Shamshinar Salehuddin , Zuhayr Md Ghazaly , Afizah Ayob , Nor Faizah Bawadi , Shamilah Anudai @ Anuar , Ahmad A.N.A.

Concrete prisms are being test with flexural testing by different percentage volume of steel fibres. The total number of 24 prisms were made which contain 3 %, 6 % and 9 % of steel fibres respectively. This only consist experimental results. Specimens used in this study using a prism mold of 100 mm x 100 mm x 500 mm. Eighteen prisms will be added with a layer of 10 mm of steel fibre using slurry method. All of the samples were tested using flexural testing to determine the maximum loading. The highlight scope of this research is to evaluate the physical behavior of Slurry Infiltrated Fibre Reinforced Concrete in term of maximum load and cracking pattern. The results of the study were also compared with concrete without steel fibres. However, the workability of the concrete decreased as the number of steels fibre increase. The maximum load was obtained by the lowest percentage of steel fibre (3%).

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Thermal and mechanical properties of chemical modification on sugarcane bagasse mixed with polypropylene and recycle acrylonitrile butadiene rubber composite

2020-11-01 , Zainal, Mustaffa , Ragunathan Al Santiagoo , Afizah Ayob , Azlinda Abdul Ghani , Wan Azani Wan Mustafa , Othman, Nurul Syazwani

The goal of this research is to investigate the thermal, chemical, and tensile properties of chemical modification of sugarcane bagasse (SCB)-filled polypropylene (PP) and recycled acrylonitrile butadiene rubber (NBRr). The composites with different SCB loading (5, 15, and 30 per hundred resin) were prepared using a heated two-roll mill at temperature of 180°C.Thermal and the tensile properties of the modified SCB composite have shown improvement. The silane-treated composites have higher thermal stability compared to treated NaOH. The degradation temperature at 70% weight (T70%) of NaOH and silane composite increase by 6% and 15%, respectively. Meanwhile, the tensile strength and Young’s modulus for the both treatment showed an improvement of 20% and 25% for NaOH and 30% and 32% for silane compared to untreated composites, respectively. The chemical properties were investigated using Fourier transform infrared analysis. The modification SCB fiber has improved the adhesion and interfacial bonding between SCB fiber and PP/NBRr matrices.

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A review of nanoclay applications in the pervious concrete pavement

2017-09-26 , Shahrul Azwan Shakrani , Afizah Ayob , Mohd Asri Ab Rahim

In recent years, the use of nanoclay has received various interests in order to enhance the properties of construction materials which can also be eligible for pavement technology and engineering application. This review paper summarizes the effect of nanoclay as cement replacement and additive to the performance of pervious concrete pavement. The addition of nanoclay to pervious concrete has demonstrated improvements in strength properties such as compressive and flexural strength, durability such as freeze-thaw and chloride penetration resistance, shrinkage, and denser microstructure but at the same time reduced the porosity, permeability and water absorption properties. This enhancement is due to the roles of nanoclay as nanoreinforcements, nanofillers, nucleation site, and reactive pozzolans in order to promote hydration and improve material properties.

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Publication

A practical guide of thesis writing for engineering students

2022 , Afizah Ayob

This book is an essential guide to thesis writing for university students. Written by the people who supervise your thesis, it will show you step-by-step to choose an engineering topic for the thesis that can be explored and turned into a thesis. This book will guide you through all the stages, including developing research strategies, writing with distinction, completing strongly with editing, and getting your referencing right every time. Emphasizing insider tips on what examiners look for, this straightforward and easy-to-use guide includes: The important principle for a good thesis (Yes, there is a principle!) Effective time management approach so you never submit the thesis late Putting the results into a convincing format and dealing with issues that inevitably arise Guidelines for getting your academic English right every time Avoiding common missteps, how to fix them, and improving the level of writing This book is the result of many years of teaching and supervising students. It is a must-read for anyone writing a thesis, or anyone who supervises these students.

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The Behavior of Non-Destructive Test for Different Grade of Concrete

2020-12-28 , Mustaqqim Abdul Rahim , Mohd Shahidan Shaari , Onn L.C. , Saiful Bahari N.A.A. , Rahman N.A. , Afizah Ayob

Rebound hammer tests are generally preferred as a non-destructive testing method as compared to destructive testing methods such as compression tests. In this study, a general series of rebound hammer tests and destructive tests were carried on in a heavy concrete laboratory. A set of concrete cubes measuring 100 x 100 x 100 mm were cast and subjected to water curing for 7, 14 and 28 days to obtain the cube strength and rebound number. Three grades of concrete, namely M20, M25 and M30 were used in this experiment. At 28 days, the minimum target strength should be 30 MPa. The rebound hammer tests were conducted before the compression tests. The data obtained for each test was evaluated and tabulated in the findings of this study. It was found that the variation between predicted strength and experimental strength for the rebound hammer test was 0.18%. This indicates that the rebound hammer test is able to predict strength with acceptable accuracy.

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Evaluation of occupational safety and health at construction site in state of Perlis

2021-02-27 , Afizah Ayob , Ibrahim A.M. , Mokhtar H. , Syamsyiah N.R. , Din A.Z.M. , Zahid M.Z.A.M. , Rahim M.A. , Zakaria M.H.

This current study evaluates occupational safety and health (OSH) practices for 35 medium-and high-grade contractors in the state of Perlis by using structured questionnaires and interviews. Among the 70% of valid participants, majority (Scale Interval Index = 4.16) agreed that "failure to comply with OSH Act"is the main challenge to safety. They strongly believed that complying with OSH standards is beneficial to "the elimination of injury and death"and that "providing the necessary safety gears"at the construction site is among the effective methods to promote efficient OSH among the workers. Companies with adequate OSH management systems have a better record in terms of safety and performance than those that do not have such systems.

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