Now showing items 21-40 of 43

    • Study on radioactivity components, water quality and microstructure characteristic of volcano ash as geopolymer artificial aggregate 

      Rafiza, Abdul Razak; Mohd Mustafa Al Bakri, Abdullah; Kamarudin, Hussin, Brig. Jen. Dato' Prof. Dr.; Khairul Nizar, Ismail, Assoc. Prof. Dr.; Sandu, Ion; Djwantoro, Hardjito, Dr.; Zarina, Yahya (SYSCOM 18, 2013-06)
      The assessments of radioactivity, water qualitytesting and microstructure characteristic of volcano ash have been examined. The measurement of the 226Ra, 232Th, 40K, and 238U were carried out using radioactive concentration ...
    • Reviews on the different sources materials to the geopolymer performance 

      S. N. Fifinatasha; Mohd Mustafa Al-Bakri, Abdullah; Kamarudin, Hussin, Brig. Jen. Dato' Prof. Dr.; Zarina, Yahya; Rafiza, Abdul Razak; Liyana, Jamaludin (AENSI Publisher All rights reserved, 2013-10)
      Geopolymer is manufactured from the aluminosilicate source material in example fly ash, silica fume, kaolin, ground granulate blast slag (GGBS), boiler ash and volcano ash reactivated via alkaline solution. But the different ...
    • Comparison of geopolymer fly ash and ordinary Portland cement to the strength of concrete 

      Mohd Mustafa Al Bakri, Abdullah; Kamarudin, Hussin, Brig. Jen. Dato' Prof. Dr.; Mohamed, Bnhussain, Prof. Dr.; Khairul Nizar, Ismail, Assoc. Prof. Dr.; Rafiza, Abdul Razak; Zarina, Yahya (American Scientific Publishers, 2013-12)
      The aim of this study is to evaluate the effect of various fly ash: aggregate ratios by using fly ash (FA) based geopolymer compared to ordinary Portland cement (OPC) on the compressive strength of concrete. The different ...
    • Microstructure study on volcano ash geopolymer aggregate at different sintering temperature 

      Rafiza, Abdul Razak; Mohd Mustafa Al Bakri, Abdullah; Kamarudin, Hussin, Brig. Jen. Dato' Prof. Dr.; Khairul Nizar, Ismail, Assoc. Prof. Dr.; Djwantoro, Hardjito, Dr.; Wan Hamidon Wan Badaruzzaman, Ir. Dr.; Zarina, Yahya (Trans Tech Publications, 2014)
      Recent research shows that the by-product materials such as fly ash can be used as raw material in producing aggregates and lightweight aggregates. The usage of this material can improve the quality of the aggregates ...
    • Influence of dolomite on the mechanical properties of boiler ash geopolymer paste 

      Zarina, Yahya; Kamarudin, Hussin, Brig. Jen. Dato' Prof. Dr.; Mohd Mustafa Al-Bakri, Abdullah; Khairul Nizar, Ismail, Assoc. Prof. Dr.; Rafiza, Abdul Razak (Trans Tech Publications, 2014)
      The waste material from palm oil industry has been increasing since Malaysia was the world largest exported of palm oil mill. The waste such as palm fibers, nut shells, palm kernel and empty fruit bunches are the solid ...
    • Effect on strength and hardness of clay ceramic substrate after treatment using koalin based geopolymer glaze 

      Mohd Mustafa Al Bakri, Abdullah; Liyana, Jamaludin; Muhammad Faheem, Mohd Tahir; Kamarudin, Hussin, Brig. Jen. Dato' Prof. Dr.; Rafiza, Abdul Razak; Zarina, Yahya; Alida, Abdullah (Trans Tech Publications, 2014)
      Geopolymerization is an alternative for ceramic industry by using clay based material such as kaolin or calcined kaolin geopolymer. Geopolymer paste is initially produced by alkaline activation of calcined kaolin with NaOH ...
    • Effect of Solids-To-Liquids, Na2SiO3-To-NaOH and Curing Temperature on the Palm Oil Boiler Ash (Si + Ca) Geopolymerisation System 

      Zarina, Yahya; Mohd Mustafa Al Bakri, Abdullah; Kamarudin, Hussin; Khairul Nizar, Ismail; Rafiza, Abd Razak; Sandu, Andrei Victor (MDPI AG, 2015)
      This paper investigates the effect of the solids-to-liquids (S/L) and Na2SiO3/NaOH ratios on the production of palm oil boiler ash (POBA) based geopolymer. Sodium silicate and sodium hydroxide (NaOH) solution were used as ...
    • Optimization of NaOH Molarity, LUSI Mud/Alkaline Activator, and Na2SiO3/NaOH Ratio to Produce Lightweight Aggregate-Based Geopolymer 

      Rafiza, Abdul Razak; Mohd Mustafa Al Bakri, Abdullah; Kamarudin, Hussin; Khairul Nizar, Ismail; Djwantoro, Hardjito; Zarina, Yahya (MDPI AG, 2015-05-21)
      This paper presents the mechanical function and characterization of an artificial lightweight geopolymer aggregate (ALGA) using LUSI (Sidoarjo mud) and alkaline activator as source materials. LUSI stands for LU-Lumpur and ...
    • Review on potential of Geopolymer for concrete repair and rehabilitation 

      Warid Wazien, Ahmad Zailani; Mohd Mustafa Al Bakri, Abdullah; Rafiza, Abd. Razak; Mohd M.A.Z. Remy, Rozainy; Muhammad Faheem, Mohd Tahir; Meor Ahmad Faris, Meor Ahmad Tajudin; Hazamaah, Nur Hamzah (EDP Sciences, 2016)
      Cracking, spalling, surface deterioration, seepage and other concrete damage of the existing infrastructure have raised concern among residents, local authorities and developers. Dealing with concrete infrastructure ...
    • Strength, density and water absoprtion of Palm oil boiler ash (POBA) geopolymer brick/IBS brick 

      Zarina, Yahya; Kamarudin, Hussin; Mohd Mustafa Al Bakri, Abdullah; Khairul Nizar, Ismail; Rafiza, Abd Razak (Trans Tech Publications Ltd., 2016-01)
      Geopolymer or alkali-activated binder is produced by synthesizing aluminosilicate source materials with an alkaline activator solution. This study has been conducted to produce palm oil boiler ash (POBA) geopolymer brick/IBS ...
    • A Review on the Manufacturing of Lightweight Aggregates Using Industrial By-Product 

      Nor Aiman, Mahmad; Zarina, Yahya; Mohd Mustafa Al Bakri, Abdullah; Rafiza, Abd Razak; Januarti Jaya, Ekaputri; M. A., Faris; Hazamaah, Nur Hamzah (EDP Sciences, 2016-10)
      The waste materials from industrial are one of the concern issues in sustainable development. Recycle and reduce the waste material is one of the strategies to produce the better sustainable system. One of the methods is ...
    • Properties and behavior of Geopolymer Concrete Subjected to Explosive Air Blast Loading: a review 

      Nurul Aida, Mohd Mortar; Kamarudin, Hussin; Rafiza, Abdul Razak; Mohd Mustafa Al Bakri, Abdullah; Ahmad Humaizi, Hilmi; Andrei Victor, Sandu (EDP Sciences, 2017)
      The severe damage to civilian buildings, public area, jet aircraft impact and defense target under explosive blast loading can cause a huge property loss. Most of researcher discusses the topics on design the concrete ...
    • Bond strength mechanism of fly ash based geopolymer mortars: a review 

      ‪Warid Wazien, Ahmad Zailani; Mohd Mustafa Al Bakri, Abdullah; Rafiza, Abd Razak; Mohd Remy Rozainy, Mohd Arif Zainol‬; Muhammad Faheem, Mohd Tahir (IOP Publishing Ltd, 2017-11)
      Geopolymer possess many excellent properties such as high compressive and bond strength, long term durability, better acid resistance and also known as a "Sustainable Material" due to its low carbon emission and low energy ...
    • Durability of geopolymer lightweight concrete infilled LECA in seawater exposure 

      Rafiza, Abd Razak; Mohd Mustafa Al Bakri, Abdullah; Zarina, Yahya; M. S. A. Hamid (IOP Publishing Ltd, 2017-11)
      This paper describes a development of lightweight concrete using lightweight expanded clay aggregate (LECA) in fly ash (FA) based geopolymer immersed in seawater. The objective of this research is to compare the performance ...
    • Influence of kaolin in fly ash based geopolymer concrete: destructive and non-destructive testing 

      Zarina, Yahya; Mohd Mustafa Al Bakri, Abdullah; N. Mohd Ramli; Burduhos-Nergis, D. D.; Rafiza, Abd Razak (IOP Publishing Ltd, 2018-06)
      Development of geopolymer concrete is mainly to reduce the production of ordinary Portland cement (OPC) that adverse the natural effect. Fly ash is a by-product collected from electrical generating power plant which resulted ...
    • Durability of fly ash based geopolymer concrete infilled with rubber crumb in seawater exposure 

      Zarina, Yahya; Mohd Mustafa Al Bakri, Abdullah; S. N. H. Ramli; Minciuna, M. G.; Rafiza, Abd Razak (IOP Publishing Ltd, 2018-06)
      Geopolymer is an alternative binder to replace Ordinary Portland Cement (OPC)in construction industry. Source materials that rich in silica (Si) and alumina (Al) were activated by using alkaline solution. Production of ...
    • Investigation of heat released during geopolymerization with fly ash based geopolymer 

      Rosnita, Mohamed; Rafiza, Abd Razak; Mohd Mustafa Al Bakri, Abdullah; Raa Khimi, Shuib; Nurul Aida, Mohd Mortar; Warid Wazien, Ahmad Zailani (IOP Publishing Ltd, 2019-08)
      Geopolymerization consists of several chemical reactions that has been reported widely as an exothermic reaction. Previous studies on heat released during geopolymerization used metakaolin and fly ash of F class as a ...
    • Paraffin as a phase change material in concrete for enhancing thermal energy storage 

      Rafiza, Abd Razak; Khang Zhe, Adeline Choo; Mohd Mustafa Al Bakri, Abdullah; Zarina, Yahya; Subaer, Junaidi; Khairunnisa, Muhamad; Nurul Aida, Mohd Mortar (IOP Publishing Ltd, 2020-02)
      Phase change material (PCM) for thermal energy storage (TES) is the material that can absorb energy during heating process as phase change takes place and release energy to environment during cooling process. Nowadays, ...
    • Seawater exposure effect on fly ash based geopolymer concrete with inclusion of steel fiber 

      Zarina, Yahya; Mohd Mustafa Al Bakri, Abdullah; Yee Jing, Leow; Long-Yuan, Li; Rafiza, Abd Razak (IOP Publishing Ltd, 2020-02)
      Concrete is widely used in construction offshore such as concrete floating bridges and sea tank. This research is providing an alternative construction material to replace ordinary Portland cement (OPC) concrete known as ...
    • Bonding strength characteristics of FA-based geopolymer paste as a repair material when applied on OPC substrate 

      Warid Wazien, Ahmad Zailani; Bouaissi, Aissa; Mohd Mustafa Al Bakri, Abdullah; Rafiza, Abd Razak; Yoriya, Sorachon; Mohd Arif Anuar, Mohd Salleh; Mohd Remy Rozainy, M. A. Z.; Hamzah, Fansuri (MDPI AG, 2020-05)
      This investigative study aims to study the mechanical and morphological properties of fly ash (FA)-based geopolymer paste as a repair material when applied on ordinary Portland cement (OPC) overlay concrete. The first part ...