Muhd Afiq Hizami Abdullah
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Preferred name
Muhd Afiq Hizami Abdullah
Official Name
Muhd Afiq Hizami, Abdullah
Alternative Name
Abdullah, Muhd Afiq Hizami
Hizami Abdullah, Muhd Afiq
Abdullah, M. A.H.
Main Affiliation
Scopus Author ID
57206254418
Researcher ID
EJY-0602-2022

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Study of albumen as foaming agent for use in self-healing high strength concrete

2023 , Zuhairiah Zainal Zainal Abidin , Muhd Afiq Hizami Abdullah , Kunasundari Balakrishnan , Muhammad Munsif Ahmad , Nurul Ain Harmiza Abdullah , Mohd. Mustafa Al Bakri Abdullah , Q. A. Musa

Self-healing is an effective solution for sustainable maintenance for concrete to increase its durability against to sensitivity of cracking. As recently, the method of introducing bacterial agent in concrete were modified because of harsh environment in concrete such as small size of pore which cause squeezing of bacteria. In this research, the albumen from egg was used as foaming agent to create voids in concrete matrix. The aerated concrete matrix offer voids to bacteria as concrete will become dense and bacteria would squeezed during hydration process. The effect of albumen as foaming agent in concrete was studied while achieving the high strength aerated concrete type towards its compressive strength, splitting tensile strength and study the voids dissolution (visual) in concrete matrix when incorporation of albumen as foaming agent. The albumen of 2%, 4% and 6% is used as foaming agent (FA) to produce the high strength aerated concrete (HSAC). After 28 days of curing, the compressive and splitting tensile strength of HSAC reduced with the increased of albumen used in concrete. The highest compressive and splitting tensile strength of HSAC were 95.40 MPa and 6.67% respectively with 2% FA in comparison to control. The results of water absorption of HSAC also decreased when higher concentration of albumen used. The sizes of voids created in all samples were less than 15 mm. It can deduced that 2% of foaming agent was ideal to produce optimum characteristics in strength, uniform and size of voids in high strength aerated concrete.

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Effect of Using Soap Nut as Natural Foaming Agent on Mechanical Properties and Pore Distribution of High Strength Aerated Concrete

2020-07-09 , Muhd Afiq Hizami Abdullah , Rashid N.A. , Abdul Rani A.L. , Mohd Firdaus Omar , Tan Chan Sin

Aerated concrete is a type of concrete that contains pore in its matrix structure. This pores could provide spaces for water absorption which makes aerated concrete more durable toward freeze-thaw cycle. Many methods have been studied in forming an aerated concrete and using soap nut as aerating agent is more sustainable than other chemically formulated agent. Forming of pore inside concrete not only improve freeze-thaw cycle durability but also as places to store healing agent in concrete. This is important in developing a self-healing concrete especially a microbial induced healing. This paper aims to study the effect of using soap nut in high strength concrete. Four types of high strength concrete samples were prepared which are Control sample, AE2 with 2% of aerated soap nut, AE4 with 4% of aerated soap nut and AE6 with 6% of aerated soap nut. Total of 3nos. of 100mm cubes and 3nos. of 50mm cubes from each type of samples were prepared. Cubes samples of 100mm dimension were tested for water absorption and compressive strength while cube samples of 50mm dimension were split and analysed for pore distribution. The results showed that increase in addition of soap nut in concrete mixture resulted in decrease of compressive strength but minimal effect on its water absorption rate. Pore formation and dispersion were optimum in concrete with 4% and 6% inclusion of soap nut. In conclusion, 4% of aerated soap nut in high strength concrete present the optimum characteristic in producing well-dispersed pores of high strength aerated concrete.

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Microbiological removal of hydrogen sulphide from natural rubber latex processing wastewater by Acidithiobacillus thiooxidans strain UniMAP-AIN01

2020 , Sandrasekaran Naresh , Nurul Ain Harmiza Abdullah , Nor Helya Iman Kamaludin , Muhd Afiq Hizami Abdullah , Mohamad Fahrurrazi Tompang

Acidithiobacillus thiooxidans is an acidophilic chemoautotrophic bacterium which capable to convert the toxic hydrogen sulphide in wastewater into non-toxic compounds. The Acidithiobacillus thiooxidans strain UniMAP-AIN01 was previously isolated from a local natural rubber latex processing mill. In this study, the A. thiooxidans strain UniMAP-AIN01 was subjected to its growth performance evaluation in the wastewater of natural rubber latex. The sulphur content in the wastewater was utilized as energy source and support their growth. It was discovered that the A. thiooxidans strain UniMAP-AIN01 has long doubling time of 2 days in thiosulphate medium, while log phase lasted until 6th day of incubation. Regression analysis of the growth kinetic was established with the aid of POLYMATH software. The precision value obtained as follows; linear regression, R2 of 0.9811, adjusted linear regression, Adj R2 of 0.9764, root mean square deviation, RMSD of 0.0015, and variance of 1.992 × 10-5 indicate the data is highly correlated and error is insignificant. Assessment on hydrogen sulphide removal efficiency using locally isolated A. thiooxidans strain UniMAP-AIN01 revealed 90% of hydrogen sulphide removal was achieved within a week.

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Aerobic granules cultivated using industrial rubber wastewater: Effect of size distribution and Performance of granules.

2020-12-18 , Najihah Abdul Rashid , Abdul Latif Abdul Rani , Mardhiah Farhana Omar , Muhd Afiq Hizami Abdullah

Sequential batch reactors (SBR) have been successfully developed granular sludge using industrial rubber wastewater on a cylindrical shaped SBR. SBR was introduced to industrial wastewater with varying chemical oxygen demand (COD) loadings from as low as 0.01 to 0.28 kgCOD/m3/d. First phase of experiment utilized 24 hours cycle time whilst second phase of experiment utilized 4 hours cycle time. Granules were successfully developed at the second phase (4 hours) of experiment. Fortunately, the overall performance for both cycles were excellent. COD removal efficiency throughout the experiment was kept at about 78 % to 98 %. Although higher COD removal was observed for both cycle, granulation did not occur in the first phase (24 hours). Decrement of cycling time to 4 hours promotes the growth of dense and structured sludge granules.

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Determination of the mechanical properties and gamma-neutron shielding effectiveness of ultra-high performance dense concrete (UHPdC) exposed to high temperatures

2025-01 , Muhd Afiq Hizami Abdullah , Raizal S.M. Rashid , Abdullah Alnutayfat

Nuclear energy is integral in producing energy with net-zero emissions but widening its adoption requires advanced radiation shielding material. While concrete is widely used as radiation shielding material, there is a lack of study on shielding using ultra-high-performance concrete (UHPC) despite it being the most advanced concrete material to-date. This study delves into the mechanical properties and the shielding capabilities of denser UHPC (ultra-high-performance dense concrete, UHPdC) against both gamma-rays and neutron radiation, particularly under high-temperature scenarios. Three mixtures of UHPdC are composed of sand, barite, and magnetite, separately, with a common incorporation of colemanite, steel and polyvinyl alcohol (PVA) fibers. These mixtures are subjected to temperatures of 400 and 800 °C, assessing their microstructural changes via X-ray µ-CT analysis, mechanical strength, and their gamma-rays and neutron shielding properties. Key findings revealed that sand UHPdC exhibited the highest compressive strength of 131.0 MPa, while magnetite UHPdC showed superior shielding against neutron radiation and gamma-rays emitted by Co-60, demonstrating enhanced effectiveness of more than 17 % and 12 %, respectively, compared to other types. The durability of magnetite UHPdC was notably robust up to 400°C, attributed to the thermal stability of its iron oxide content. However, at 800°C, all variants exhibited diminished shielding properties, likely due to degradation of neutron moderators and absorbers at the lower temperature. This research underscores the potential of UHPdC, especially magnetite-based, as a formidable material in nuclear infrastructure, capable of withstanding extreme conditions while providing effective radiation shielding. In addition, future studies should focus on the optimizing mix designs of UHPdC to mitigate the impacts of high temperatures, thereby enhancing the structural integrity and longevity of nuclear facilities.

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Studies on factors affecting unconfined compressive strength of industrial rubber sludge containing heavy metals treated using ordinary Portland cement via stabilization/solidification technique

2020-12-18 , Abdul Latif Abdul Rani , Najihah Abdul Rashid , Muhd Afiq Hizami Abdullah , Mohd Firdaus Omar , Salim A.S. , Anuar N.A.I.

High concentration of selected heavy metals within industrial rubber sludge collected from rubber industry wastewater treatment plant has classified the waste as scheduled waste. Special treatment to the waste by using ordinary Portland cement via solidification/stabilization (S/S) technique has been performed in laboratory scale. The objective of this research is to determine related factors that affect unconfined compressive strength (UCS) performance of stabilised/solidified (s/s) cube specimens which contains industrial rubber sludge waste. Other parameters observed include the curing condition (i.e. air and water immersion curing method), waste composition, specimen age and density. The prepared fresh mix were cast in plastic moulds in order to produce 50 mm3 cubical shape specimens and leaved to set approximately 24 to 48 hours. The prepared specimen batches are S1 (90% OPC + 10% waste), S2 (70% OPC + 30% waste), S3 (50% OPC + 50% waste). UCS was performed on respective specimen age of 7 and 28 days. Positive results were obtained as relatively the average compressive strength of 7 day air cured specimens reach 5.25 MPa, 5.28 MPa, and 2.16 MPa for S1, S2 and S3.While, 28 days air cured specimens results are 9.59 MPa, 8.01 MPa, and 1.46 MPa for S1, S2, and S3 respectively. As for water immersion, the compressive strengths are 8.19 MPa, 4.93 MPa, and 1.90 MPa for 7 days, and 7.75 MPa, 10.10 MPa, and 2.11 MPa for 28 days at respective S1, S2 and S3 sequence. As conclusion, the specimens prepared passed the minimum requirement for secured landfill disposal which is at 1 MPa.

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Performance of sequencing batch reactor for the removal of chemical oxygen demand from waste cooking oil

2022-06-01 , Abdul Rashid N.B. , Abdul Latif Abdul Rani , Mardhiah Farhana Omar , Muhd Afiq Hizami Abdullah , Permana Putri E.B. , Syafiuddin A.

The production of highly polluted waste cooking oil (WCO) that contains both inorganic and organic compounds has been increased in Malaysia particularly in food industries. This study was aimed to utilize a sequencing batch reactor (SBR) in order to investigate the aerobic treatment of WCO. The system was operated at pH ranging from 4 to 5 and temperature ranged from 25°C to 31°C. The SBR reactor was fabricated using Perspex with a working volume of 2 L. Experiments were con-ducted daily at fill, react, settle, draw, and idle phase at 1, 1, 2, 1, and 1 h, respectively. The chemical oxygen demand (COD) and turbidity were assessed in determining SBR performance. Highest COD removal and turbidity values were at 67% and 0.94 NTU, respectively. A stable effluent quality was achieved after 13 d of operational investigation. In general, the SBR treatment was able to achieve acceptable discharge limit for the final treated effluent.

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Partially Replacement of Cement by Sawdust and Fly Ash in Lightweight Foam Concrete

2020-03-18 , Mohd Firdaus Omar , Muhd Afiq Hizami Abdullah , Rashid N.A. , Abdul Latif Abdul Rani

The rapid growth of population has led to increased demand for fast, affordable and quality housing development. Today, the construction industry in Malaysia has shifted from conventional methods to Industrial Building Systems (IBS). The most commonly used IBS component is precasat concrete with lightweight foam concrete. This study focuses on the main component of foam lighweight concrete, which is a partially replacement of cement by sawdust and fly ash. Among the features of lightweight concrete is density below 1800 kg/m3. Therefore, the objectives of this study is to determine the effects of sawdust and fly ash as part of cement replacement in terms of mechanical properties (compressive strenght) and physical properties (water absorption). In addition, this study also determine the optimum percentage of cement replacement by sawdust and fly ash in building material. The percentage of saw dust and fly ash used in this study as a partial replacement cement are 5%, 10%, 15% and 20%. The results show that increasing the percentage of mix propotion will increase the water absorption rate as well as decrease the compressive strenght of strength. Also, the density and compressive strength of lightweight foam concrete will decrease as the percentage of partial replacement cement increases. According to JKR Standard Specification for Building Works that referred in Malaysia, the minimum compression strength of lightweight foam concrete allowed for hollow blocks is 2.8 N/mm2. The results obtained from this study show lightweight concrete blocks using saw dust and fly ash as part of the cement replacement meet the standards and can be commercialized in the industrial building system development.

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Evaluation on physical and chemical properties of treated industrial wastewater sludge containing latex and heavy metals using ordinary Portland cement via stabilization / solidification technique

2020-07-09 , Abdul Latif Abdul Rani , Rashid N.A. , Muhd Afiq Hizami Abdullah , Mohd Firdaus Omar

Industrial wastewater sludge containing latex collected from rubber industry wastewater treatment plant has classified the waste as scheduled waste due to high concentration of selected heavy metals within it. Laboratory scale of special treatment via solidification/stabilization (S/S) technique has been performed to the waste by using ordinary Portland cement. The objective of this research is to evaluate the chemical properties of the raw waste using X-Ray Fluorescence (XRF) and physical properties related to unconfined compressive strength (UCS) performance of stabilised/solidified (s/s) cube specimens. Other factors took into consideration include the curing condition using air and water immersion curing technique, waste addition percentage, specimen age and density. The fresh mix prepared were cast in plastic moulds internal dimension of 50 mm3 producing cubical shape specimens and cured approximately 24 to 48 hours. The prepared specimen batches are A1 (90% OPC + 10% waste), A2 (70% OPC + 30% waste), A3 (50% OPC + 50% waste). Chemical analyses using XRF indicates that raw sludge contains approximately several heavy metals such as Aluminium (30%), Phosphorus, P (17.5%) and Zinc, Zn (11.7%). UCS testing were conducted on 7 and 28 days of specimen age. Positive average compressive strength results of 7 day air cured specimens reach 5.25 MPa, 5.28 MPa, and 2.16 MPa for A1, A2 and A3. Next, 28 days air cured specimens results are 9.59 MPa, 8.01 MPa, and 1.46 MPa for A1, A2, and A3 respectively. As for water immersion, the compressive strengths are 8.19 MPa, 4.93 MPa, and 1.90 MPa for 7 days, and 7.75 MPa, 10.10 MPa, and 2.11 MPa for 28 days at respective A1, A2 and A3 sequence. Based on the UCS performance, the tested specimens surpassed the minimum requirement for secured landfill disposal which is at 1 MPa.

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Study on the potential of repair fire-damaged reinforced concrete beams using ultra high performance concrete with curing at ambient temperature

2016 , Muhd Afiq Hizami Abdullah

Fire-damaged reinforced concrete structure requires repair work to improve its serviceability and prevent structural failure. The intense fire exposure on the structure deteriorates its strength and durability. Fire-damaged concrete structure was normally repaired using the shotcrete and normal strength concrete as practised previously. In experimental work, usage of fibre reinforced polymer (FRP) as repair material to retrofit or wrap around the fire-damaged concrete indicates improve strength but has lower effect on stiffness. This study used Ultra High Performance Concrete (UHPC) as repair material. UHPC composed of fine size aggregate, cement, silica fume and superplasticizer. Another composition of UHPC that also includes steel fibre is considered as ultra high performance fibre reinforced concrete (UHPFRC). This material has an excellent mechanical properties compared to high strength concrete and steel fibre in the UHPFRC enhances its ductility behaviour. Contrary to normal practise of curing regime for UHPC, this research adopted ambient temperature curing instead of high temperature curing. This is to ease the application of UHPC on site. The aim of this research is to repair fire-damaged reinforced beam concrete with 2 types of material which is UHPC and UHPFRC. UHPC which does not incorporate steel fibre in the mix was laid on compressive face of fire-damaged beam sample. UHPC is considered as economical compared to UHPFRC and aimed to repair fire-damaged beam as additional layer of compression. UHPFRC has steel fibre in the mix and is placed on tensile face of fire-damaged beam. UHPFRC is aimed to repair the fire-damaged sample as additional tensile layer of composite structure. Assessment is made based on flexural strength, peak load capacity, toughness and elastic stiffness to evaluate the suitability of UHPC as repair material. Repair of 400°C fire-damaged samples using UHPC fully regained its original peak load capacity and toughness. Repair of 400°C fire-damaged samples using UHPFRC fully regained its original flexural strength, peak load capacity and toughness. Repair of 600°C fire-damaged samples using UHPC and UHPFRC failed to fully rehabilitate its peak load capacity, flexural strength, elastic stiffness and toughness. In conclusion, UHPC of 20mm thickness is not viable as repair material for fire-damaged concrete.

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