Muhammad Faheem Mohd Tahir, Mr.This page provides access to scholarly publication by UniMAP Faculty members and researchershttp://dspace.unimap.edu.my:80/xmlui/handle/123456789/393292024-03-29T00:45:16Z2024-03-29T00:45:16ZOptimizing of the cementitious composite matrix by addition of steel wool fibers (chopped) based on physical and mechanical analysisAkrm A Rmdan, AmerMohd Mustafa Al Bakri, AbdullahLiew, Yun-MingIkmal Hakem, AzizWysłocki, Jerzy J.Muhammad Faheem, Mohd TahirSochacki, WojciechGarus, SebastianGondro, JoannaHetham A, . R. Amerhttp://dspace.unimap.edu.my:80/xmlui/handle/123456789/747592022-03-23T01:42:04Z2021-02-01T00:00:00ZOptimizing of the cementitious composite matrix by addition of steel wool fibers (chopped) based on physical and mechanical analysis
Akrm A Rmdan, Amer; Mohd Mustafa Al Bakri, Abdullah; Liew, Yun-Ming; Ikmal Hakem, Aziz; Wysłocki, Jerzy J.; Muhammad Faheem, Mohd Tahir; Sochacki, Wojciech; Garus, Sebastian; Gondro, Joanna; Hetham A, . R. Amer
The demand for durable, resistant, and high-strength structural material has led to the use of fibers as reinforcing elements. This paper presents an investigation into the inclusion of chopped steel wool fibers (CSWFs) in cement to form a high-flexural strength cementitious composite matrix (CCM). CSWFs were used as the primary reinforcement in CCM at increments of 0.5 wt%, from 0.5–6 wt%, with ratios of cement to sand of 1:1.5 and water to cement of 0.45. The inclusion of CSWFs resulted in an excellent optimization of the physicomechanical properties of the CCM, such as its density (2.302 g/cm3), compressive strength (61.452 MPa), and maximum flexural strength (10.64 MPa), all of which exceeded the performances of other reinforcement elements reported in the literature.
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2021-02-01T00:00:00ZCharacterisation at the bonding zone between fly ash based geopolymer repair materials (GRM) and ordinary portland cement concrete (OPCC)Warid Wazien, Ahmad ZailaniMohd Mustafa Al Bakri, AbdullahMohd Fadzil, ArshadRafiza, Abd RazakMuhammad Faheem, Mohd TahirRemy Rozainy, Mohd Arif ZainolNabiałek, MarcinSandu, Andrei VictorWysłocki, Jerzy J.Błoch, Katarzynahttp://dspace.unimap.edu.my:80/xmlui/handle/123456789/747502022-03-22T02:24:10Z2020-12-01T00:00:00ZCharacterisation at the bonding zone between fly ash based geopolymer repair materials (GRM) and ordinary portland cement concrete (OPCC)
Warid Wazien, Ahmad Zailani; Mohd Mustafa Al Bakri, Abdullah; Mohd Fadzil, Arshad; Rafiza, Abd Razak; Muhammad Faheem, Mohd Tahir; Remy Rozainy, Mohd Arif Zainol; Nabiałek, Marcin; Sandu, Andrei Victor; Wysłocki, Jerzy J.; Błoch, Katarzyna
In recent years, research and development of geopolymers has gained significant interest in the fields of repairs and restoration. This paper investigates the application of a geopolymer as a repair material by implementation of high-calcium fly ash (FA) as a main precursor, activated by a sodium hydroxide and sodium silicate solution. Three methods of concrete substrate surface preparation were cast and patched: as-cast against ordinary Portland cement concrete (OPCC), with drilled holes, wire-brushed, and left as-cast against the OPCC grade 30. This study indicated that FA-based geopolymer repair materials (GRMs) possessed very high bonding strength at early stages and that the behavior was not affected significantly by high surface treatment roughness. In addition, the investigations using scanning electron microscopy (SEM) and energy-dispersive X-ray (EDX) spectroscopy have revealed that the geopolymer repair material became chemically bonded to the OPC concrete substrate, due to the formation of a C–A–S–H gel. Fundamentally, the geopolymer network is composed of tetrahedral anions (SiO4)4− and (AlO4)5− sharing the oxygen, which requires positive ions such as Na+, K+, Li+, Ca2+, Na+, Ba2+, NH4+, and H3O+. The availability of calcium hydroxide (Ca(OH)2) at the surface of the OPCC substrate, which was rich in calcium ions (Ca2+), reacted with the geopolymer; this compensated the electron vacancies of the framework cavities at the bonding zone between the GRM and the OPCC substrate.
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2020-12-01T00:00:00ZCompressive strength and thermal conductivity of metakaolin geopolymers with anisotropic insulationsNur Ain, JayaYun-Ming, LiewMohd Mustafa Al Bakri, AbdullahKamarudin, HussinCheng Yong, HeahRidho, BayuajiMuhammad Faheem, Mohd Tahirhttp://dspace.unimap.edu.my:80/xmlui/handle/123456789/747052022-03-17T03:21:17Z2020-02-01T00:00:00ZCompressive strength and thermal conductivity of metakaolin geopolymers with anisotropic insulations
Nur Ain, Jaya; Yun-Ming, Liew; Mohd Mustafa Al Bakri, Abdullah; Kamarudin, Hussin; Cheng Yong, Heah; Ridho, Bayuaji; Muhammad Faheem, Mohd Tahir
This research investigated the properties of thermally insulating geopolymer prepared using waste filler (fibreboard and rubber) to act as anisotropic pore/insulation. The geopolymer matrix was synthesised using metakaolin and an alkaline solution consists of sodium hydroxide solution and sodium silicate mixture. Geopolymers with varying content (0, 3, 5 and 7 layers) of coin-shaped fibreboard and expanded polystyrene are produced to examine the anisotropic insulation effect on the material characteristics. The compressive strength and thermal conductivity were determined experimentally. From the results, it is proved that the use of anisotropic insulations can improve the thermal conductivity and minimizing the reduction of compressive strength. Geopolymer incorporated with fibreboard had better performance in terms of strength while geopolymer incorporated with rubber had better thermal conductivity.
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2020-02-01T00:00:00ZPerformance of geopolymer concrete when exposed to marine environmentFakhryna Hannanee, Ahmad ZaidiRomisuhani, AhmadMohd Mustafa Al Bakri, AbdullahMuhammad Faheem, Mohd TahirZarina, YahyaWan Mastura, Wan IbrahimAhmad Syauqi, Sauffihttp://dspace.unimap.edu.my:80/xmlui/handle/123456789/746332022-03-15T01:01:32Z2019-07-01T00:00:00ZPerformance of geopolymer concrete when exposed to marine environment
Fakhryna Hannanee, Ahmad Zaidi; Romisuhani, Ahmad; Mohd Mustafa Al Bakri, Abdullah; Muhammad Faheem, Mohd Tahir; Zarina, Yahya; Wan Mastura, Wan Ibrahim; Ahmad Syauqi, Sauffi
Over the decades, concrete is widely known as the most resourceful construction material as it is suitable for many building applications. However, despite its ability to last hundreds of years in many applications, it has been proven that Portland cement concrete poses problems such as carbon dioxide emission and its durability when exposed to sea water, sulphuric soils or freezing weather. As a result, an alternative binder is in need to reduce these problem which nowadays, the uses of geopolymer concrete is promoted. Therefore, this research is intended to investigate the effect of marine environment towards geopolymer concrete and is compared to OPC concrete. By using the same curing conditions, both type of concrete is immersed in artificial seawater for total of 28 days before the properties such as water absorption, density and compressive strength is tested. As a result, despite the similar density, the GPC is found to have lower water absorption and higher compressive strength when compared to OPC concrete. As a conclusion, GPC exhibits a higher resistance to seawater thus, suitable for construction in marine environment when compared to OPC.
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2019-07-01T00:00:00Z