Alida Abdullah
Thumbnail Image
Preferred name
Alida Abdullah
Official Name
Alida, Abdullah
Alternative Name
Abdullah, Alida
Abdullah, A.
Abdullah, A. C.
Main Affiliation
Scopus Author ID
54979598300

Research Output

Filters

19
Reset filters

Settings
Now showing 1 - 10 of 19
No Thumbnail Available
Publication

Preliminary study on the physical properties of palm ash and PCB waste mixed with phenolic resin

2010-06-09 , Mohd Radzi Ali , Shamsul Baharin Jamaludin , Che Mohd Ruzaidi Ghazali , Nur Hidayah Ahmad Zaidi , Alida Abdullah

Brake pad is widely used in automotive industry and consists of various materials including asbestos which is harmful to the human and its production exceeds 10 or more ingredients. In this work, preliminary investigation on possibility to use combination palm ash and PCB waste was carried out in order to reduce harmful materials in brake pad and pollutions. Characterization of palm ash and PCB was done by using XRF, Malvern Particle size and Scanning Electron Microscopy (SEM). The composition palm ash and PCB waste was prepared by pre-mix the palm ash, PCB waste and aluminum powder with phenolic resins in ball mill and then compressed at 122 MPa. Samples were cured at temperature 150°C for 5 minutes. Microstructure, density and porosity, water absorption and compressive test were carried out on the specimens.

View
Thumbnail Image
Publication

Performance of Sintered Pozzolanic Artificial Aggregates as Coarse Aggregate Replacement in Concrete

2021-01-01 , Rafiza Abd Razak , Mohd. Mustafa Al Bakri Abdullah , Kamarudin Hussin , Subaer , Zarina Yahya , Mohamed R. , Alida Abdullah

The abundant increase in waste quantities year by year and the depletion of natural resources worldwide are the major concerns among researchers. Recycling and reusing various types of natural or by-product material waste from industry become highlighted in the recent study. The growing demand for concrete and the production of artificial aggregate become crucial in the construction industry. Artificial aggregate can be produced either by sintering, auto-clave or cold bonding method. Although auto-clave and cold bonding methods can minimize energy consumption, the selection of the sintering method always leads to high quality and better properties of artificial aggregates produced. The use of sintering methods to produce artificial aggregate made from pozzolanic material focuses on the use of volcanic ash as raw material activated by geopolymerization process to produce artificial lightweight aggregate-based geopolymer will be summarized in this chapter. This chapter discusses the result of the physical and mechanical properties of artificial lightweight aggregate or known as sintered geopolymer volcanic ash artificial lightweight aggregate (SGVA). The interfacial transition zone (ITZ) of sintered geopolymer volcanic ash artificial lightweight aggregate (SGVA) is presented. The performance of sintered geopolymer volcanic ash artificial lightweight aggregate (SGVA) in concrete is also discussed.

View
Thumbnail Image
Publication

Aggregate impact value (AIV) of fly ash geopolymer artificial aggregate at different sodium hydroxide (NaOH) concentration

2020-11-02 , Alida Abdullah , Mohd. Mustafa Al Bakri Abdullah , Kamarudin Hussin , Zarina Yahya , Romisuhani Ahmad , Rafiza Abd Razak

This research was conducted to study the aggregate impact value (AIV) of fly ash geopolymer artificial aggregate at different sodium hydroxide (NaOH) concentration. This research involves five different concentrations of NaOH solution which are 6M, 8M, 10M, 12M and 14M while ratio of NaOH/NaSi2O3 is constant at 2.5. In this study, the ratio of solid to liquid is fix at 3.0. The characterization of fly ash was observed by Scanning Electron Microscope (SEM). Results show that, the sample with 12M of NaOH concentration give the lowest percentage of AIV (22.43%) which denotes a high performance of aggregate in concrete field and also contribute to high performance of concrete while 6M of NaOH concentration gives the highest percentage of AIV (26.95%). The tested results indicated that the significant potential of fly ash geopolymer aggregate as an alternative artificial aggregate in construction materials field.

View
No Thumbnail Available
Publication

Pengenalan Bahan Komposit

2011 , Khairel Rafezi Ahmad , Mohd. Mustafa Al Bakri Abdullah , Che Mohd Ruzaidi Ghazali , Shamsul Baharin Jamaluddin , Mohamed Faisol Mohamed Nor , Alida Abdullah

Bahan komposit ialah satu bahan kejuruteraan yang juga dikenali sebagai ‘Bahan Termaju’ dan penggunaannya semakin meluas pada masa kini. Perkara-perkara asas seperti jenis, sifat, kaedah penghasilan dan contoh aplikasi bagi bahan komposit dibincangkan di dalam buku ini. Buku ini juga menerangkan secara terperinci tentang bahan komposit seperti komposit matriks polimer, komposit matriks logam, komposit matriks seramik dan komposit matriks simen. Dengan terhasilnya penerbitan buku ini, diharapkan dapat membantu dan menarik minat pembaca yang ingin mengetahui lebih lanjut tentang bahan komposit dalam meningkatkan pemahaman terhadap asas-asas komposit atau bahan termaju dalam kejuruteran bahan.

View
Thumbnail Image
Publication

Mechanical performance, microstructure, and porosity evolution of fly ash geopolymer after ten years of curing age

2023 , Ikmal Hakem A. Aziz , Mohd. Mustafa Al Bakri Abdullah , Rafiza Abd Razak , Zarina Yahya , Mohd Arif Anuar Mohd Salleh , Jitrin Chaiprapa , Catleya Rojviriya , Petrica Vizureanu , Andrei Victor Sandu , Muhammad Faheem Mohd. Tahir , Alida Abdullah , Liyana Jamaludin

This paper elucidates the mechanical performance, microstructure, and porosity evolution of fly ash geopolymer after 10 years of curing age. Given their wide range of applications, understanding the microstructure of geopolymers is critical for their long-term use. The outcome of fly ash geopolymer on mechanical performance and microstructural characteristics was compared between 28 days of curing (FA28D) and after 10 years of curing age (FA10Y) at similar mixing designs. The results of this work reveal that the FA10Y has a beneficial effect on strength development and denser microstructure compared to FA28D. The total porosity of FA10Y was also lower than FA28D due to the anorthite formation resulting in the compacted matrix. After 10 years of curing age, the 3D pore distribution showed a considerable decrease in the range of 5–30 µm with the formation of isolated and intergranular holes.

View
Thumbnail Image
Publication

The effects of various concentrations of NaOH on the Inter-Particle Gelation of a Fly Ash Geopolymer Aggregate

2021 , Alida Abdullah , Kamarudin Hussin , Mohd. Mustafa Al Bakri Abdullah , Zarina Yahya , Wojciech Sochacki , Rafiza Abdul Razak , Katarzyna Błoch , Hamzah Fansuri

Aggregates can be categorized into natural and artificial aggregates. Preserving natural resources is crucial to ensuring the constant supply of natural aggregates. In order to preserve these natural resources, the production of artificial aggregates is beginning to gain the attention of researchers worldwide. One of the methods involves using geopolymer technology. On this basis, this current research focuses on the inter-particle effect on the properties of fly ash geopolymer aggregates with different molarities of sodium hydroxide (NaOH). The effects of synthesis parameters (6, 8, 10, 12, and 14 M) on the mechanical and microstructural properties of the fly ash geopolymer aggregate were studied. The fly ash geopolymer aggregate was palletized manually by using a hand to form a sphere-shaped aggregate where the ratio of NaOH/Na2SiO3 used was constant at 2.5. The results indicated that the NaOH molarity has a significant effect on the impact strength of a fly ash geopolymer aggregate. The highest aggregate impact value (AIV) was obtained for samples with 6 M NaOH molarity (26.95%), indicating the lowest strength among other molarities studied and the lowest density of 2150 kg/m3. The low concentration of sodium hydroxide in the alkali activator solution resulted in the dissolution of fly ash being limited; thus, the inter-particle volume cannot be fully filled by the precipitated gels.

View
Thumbnail Image
Publication

The Effects of Various Concentrations of NaOH on the Inter-Particle Gelation of a Fly Ash Geopolymer Aggregate

2021 , Alida Abdullah , Kamarudin Hussin , Mohd. Mustafa Al Bakri Abdullah , Zarina Yahya , Wojciech Sochacki , Katarzyna Błoch , Hamzah Fansuri , Rafiza Abdul Razak

Aggregates can be categorized into natural and artificial aggregates. Preserving natural resources is crucial to ensuring the constant supply of natural aggregates. In order to preserve these natural resources, the production of artificial aggregates is beginning to gain the attention of researchers worldwide. One of the methods involves using geopolymer technology. On this basis, this current research focuses on the inter-particle effect on the properties of fly ash geopolymer aggregates with different molarities of sodium hydroxide (NaOH). The effects of synthesis parameters (6, 8, 10, 12, and 14 M) on the mechanical and microstructural properties of the fly ash geopolymer aggregate were studied. The fly ash geopolymer aggregate was palletized manually by using a hand to form a sphere-shaped aggregate where the ratio of NaOH/Na2SiO3 used was constant at 2.5. The results indicated that the NaOH molarity has a significant effect on the impact strength of a fly ash geopolymer aggregate. The highest aggregate impact value (AIV) was obtained for samples with 6 M NaOH molarity (26.95%), indicating the lowest strength among other molarities studied and the lowest density of 2150 kg/m3. The low concentration of sodium hydroxide in the alkali activator solution resulted in the dissolution of fly ash being limited; thus, the inter-particle volume cannot be fully filled by the precipitated gels.

View
Thumbnail Image
Publication

Development of composite cement reinforced with coconut fibre

2012 , Alida Abdullah

This research was conducted to develop cement composite with the addition of coconut fibre in cement panel. The raw materials used were Ordinary Portland cement, coconut fibre, sand and water. The development of cement composites in this research were done by substituting coconut fibre to the portion of sand based on the ratio of cement to sand. In this study, the ratios used to design the mixture were 1:1:0, 1:0.97:0.03, 1:0.94:0.06, 1:0.91:0.09, 1:0.87:0.12 and 1:0.84:0.15 (cement: sand: coconut fibre). The amount of water per cement ratio was fixed at 0.55 for each mixture ratio. The sizes of sample tested were, 160 mm x 40 mm x 40 mm for compression test, and 100 mm x 100 mm x 40 mm for density, moisture content and water absorption tests. The samples were cured in water for 7, 14, and 28 days. The result shows that the cement composite with 9 wt. % of coconut fibre gives highest flexural and compressive strength. It was found that by increasing the content of coconut fibre, the density of cement composite was decreased while the water absorption and the moisture content percentages were increased. This study also reports the fracture behaviour of composites after flexural test. It revealed the crack bridging had strengthened the composite.

View
Thumbnail Image
Publication

Bahan geopolimer : Pemprosesan, Pencirian dan Aplikasi

2015 , Mohd. Mustafa Al Bakri Abdullah , Zarina Yahya , Alida Abdullah , Rafiza Abd Razak , Kamarudin Hussin , Liyana Jamaludin , Muhammad Faheem Mohd. Tahir

Buku Bahan Geopolimer: Pemprosesan, Pencirian dan Aplikasi adalah sebuah buku yang membincangkan beberapa aspek penting mengenai bahan geopolimer seperti pemprosesan, perincian, aplikasi dan sifat bahan geopolimer dalam teknologi konkrit. Buku ini juga menerangkan secara terperinci tentang bahan geopolimer dari aspek teori, pemprosesan, pencirian dan aplikasi yang sesuai dijadikan sebagai bahan rujukan dan panduan kepada pelajar, penyelidik dan pengamal industri.

View
Thumbnail Image
Publication

Article the effects of various concentrations of naoh on the inter-particle gelation of a fly ash geopolymer aggregate

2021-03-01 , Alida Abdullah , Kamarudin Hussin , Mohd. Mustafa Al Bakri Abdullah , Zarina Yahya , Sochacki W. , Rafiza Abd Razak , Błoch K. , Fansuri H.

Aggregates can be categorized into natural and artificial aggregates. Preserving natural resources is crucial to ensuring the constant supply of natural aggregates. In order to preserve these natural resources, the production of artificial aggregates is beginning to gain the attention of researchers worldwide. One of the methods involves using geopolymer technology. On this basis, this current research focuses on the inter-particle effect on the properties of fly ash geopolymer aggregates with different molarities of sodium hydroxide (NaOH). The effects of synthesis parameters (6, 8, 10, 12, and 14 M) on the mechanical and microstructural properties of the fly ash geopolymer aggregate were studied. The fly ash geopolymer aggregate was palletized manually by using a hand to form a sphere-shaped aggregate where the ratio of NaOH/Na2SiO3 used was constant at 2.5. The results indicated that the NaOH molarity has a significant effect on the impact strength of a fly ash geopolymer aggregate. The highest aggregate impact value (AIV) was obtained for samples with 6 M NaOH molarity (26.95%), indicating the lowest strength among other molarities studied and the lowest density of 2150 kg/m3 . The low concentration of sodium hydroxide in the alkali activator solution resulted in the dissolution of fly ash being limited; thus, the inter-particle volume cannot be fully filled by the precipitated gels.

View