Afizah Ayob
Thumbnail Image
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

Research Output

Filters

29
29
Reset filters

Settings
Now showing 1 - 10 of 29
  • Publication
    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.
  • Publication
    The Contractors' Perception on the Development of Green Building Projects in Penang
    ( 2023-01-01)
    Nur Soleha Abdul Rahim
    ;
    Rahman B.A.
    ;
    Fazdliel Aswad Ibrahim
    ;
    Nurfadzillah Ishak
    ;
    Afizah Ayob
    A strategy to lessen the substantial effects of the building development on the environment, society, and economy is green construction. However, despite the positive effects of green buildings on society, numerous market hurdles prevent the growth of green buildings, particularly in Malaysia. This happens because of the lack of awareness regarding the development of green buildings. Therefore, this study aims to explore the contractor perception of the development of green building projects in Penang. A set of questionnaire survey was distributed among eighty-three (83) contractors representing construction organizations in Penang. The analysis showed that the contractors mostly agreed with the benefits of green building, indicating that the respondents are aware of green building. The results shows that financial factor with mean value of 4.66 is the main factor hampering the development of green buildings, followed by law and regulation factor (x ., = 4.60) and quality factor (x ., = 4.54). Besides, most of the respondents also agreed that improving the professional knowledge among contractors (x ., = 4.70) will encourage the development of green buildings. Immediate action should be taken on the strategy either from their sides or from other authorities. Overall, this research provides insight into the perception of the development of green building projects among contractors, which can increase awareness on green building and contributing to a better environment.
  • Publication
    The Behavior of Non-Destructive Test for Different Grade of Concrete
    ( 2020-12-28)
    Rahim M.A.
    ;
    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.
  • Publication
    Relationship between Density and Early Compressive Strength of Slurry Infiltrated Fiber Reinforced Concrete (SIFCON)
    ( 2021-12-14)
    Mustaqqim Abdul Rahim
    ;
    Jonq L.J.
    ;
    Afizah Ayob
    ;
    Shamilah Anudai @ Anuar
    ;
    Nor Faizah Bawadi
    ;
    Norlia Mohamad Ibrahim
    ;
    Shahidan S.
    ;
    Ahmad A.N.A.
    ;
    Wahab R.A.
    The aim of the study is to study the physical and mechanical characteristics of Slurry Infiltrated Fiber Reinforced Concrete with fiber percentage volume of 5% and lower. For the testing of physical characteristics of the concrete, density test been conducted. For the testing of mechanical characteristics, compression test used to determine strength of concrete sample. The density of Slurry Infiltrated Fiber Reinforced Concrete increased when the usage of steel fiber percentage volume increases from 1% to 5%, nevertheless when compared to density of ordinary concrete, ordinary concrete is denser. For the significant of study, the mechanical properties of Slurry Infiltrated Fiber Reinforced Concrete, compressive strength increased when the fiber content increases from 1% to 5% percentage volume.
      1
  • Publication
    The Effect of Concrete Mix Incorporating Different Percentage of Dolomite Fines
    ( 2023-01-01)
    Mustaqqim Abdul Rahim
    ;
    Ivin C.
    ;
    Norlia Mohamad Ibrahim
    ;
    Afizah Ayob
    ;
    Shamilah Anudai @ Anuar
    ;
    Nor Faizah Bawadi
    ;
    Nur Liza Rahim
    ;
    Shahidan S.
    ;
    Zuki S.S.M.
    ;
    Ahmad A.N.A.
    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. In this research, the replacement of cement with dolomite fines carried out in this study is 0%, 5%, 10%, 15% and 25%. The grade of concrete a designed to be 30. A total of 45 units of 150 mm x 150 mm x 150 mm concrete cube and 30 units of cylindrical concrete sample with diameter of 150 mm and height of 300 mm designed in this study. The properties of concrete sample in terms of compressive strength, splitting tensile strength, ultra-pulse velocity and rebound hammer test for various percentage replacement are determined in this study. The tests on concrete sample carried out at the age of 7-days and 28-days. Overall, its shows that 10 % replacement of cement with dolomite fines provided the highest strength to the concrete in terms of compressive strength and splitting tensile strength.
      2
  • Publication
    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.
      2
  • Publication
    Manufacturing of cast in situ ultra high performance fibre reinforced concrete (uhpfrc)-Workability, Tensile and Compressive Strength
    ( 2020-03-18)
    Mohd Zulham Affandi Mohd Zahid
    ;
    Abu Bakar B.H.
    ;
    Mohamed Nazri F.
    ;
    Afizah Ayob
    ;
    Abdul Razak R.
    The aim of this article is to share on the manufacturing process of Ultra High Performance Fibre Reinforced Concrete (UHPFRC) without heat curing or steam curing, hence, it makes UHPFRC possible to be used for in situ application. The common materials used in numerous previous studies were used in this work to produce UHPFRC: Cement type CEM I, fine sand, silica fume, water and third generation high range water reducer. Three tests were conducted, i.e. Compression test and slump flow test and tensile test. The targeted slump flow is in the range of 600 mm to 750 mm, minimum targeted compressive strength and tensile strength test is 115 MPa and 10 MPa, respectively. In addition, the UHPFRC must exhibit strain hardening properties. As a result, this study proposes the mix proportion of the above mentioned material used to produce UHPFRC which is suitable to be utilized for in situ application.
  • Publication
    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.
  • Publication
    Relationship between Ultrasonic-Pulse Velocity and Compression Test for Different Grade of Concrete
    ( 2020-07-09)
    Mustaqqim Abdul Rahim
    ;
    Choon Onn L.
    ;
    Nur Aizat Ahmad A.
    ;
    Shahidan S.
    ;
    Salwa Mohd Zuki S.
    ;
    Shamshinar Salehuddin
    ;
    Afizah Ayob
    ;
    Shamilah Anudai @ Anuar
    ;
    Nor Faizah Bawadi
    Ultrasonic pulse velocity methods is one of the non-destructive testing methods. Commonly the compression test was used to determine the compression strength of concrete. Laboratory works had been carried out at heavy concrete laboratory to obtain the result for both non-destructive and destructive test. By using concrete cubes of sizes 100 x 100 x 100 mm and subjected to water curing for 7, 14, 21 and 28 days to obtained desire result for Ultrasonic Pulse Velocity and Compression test. Ultrasonic Pulse Velocity were initially done before the Compression test. The data obtained from each test has been evaluated and tabulated in this report. From this research, the variation between predicted strength and experimental strength for Ultrasonic Pulse Velocity testing was identified; the higher the pulse velocity, the higher the predicted strength and lower times passes by pulse velocity, the higher the predicted strength.
  • Publication
    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%).