Browsing Zarina Yahya, Dr. by Author "nizar@unimap.edu.my"

Now showing items 1-14 of 14

    • Chemical and physical characterization of boiler ash from palm oil industry waste for geopolymer composite 

      Zarina, Yahya; Mohd Mustafa, Al Bakri Abdullah; Kamarudin, Hussin; Khairul Nizar, Ismail; Andrei Victor, Sandu; Petricǎ, Vizureanu; Rafiza, Abdul Razak (Syscom 18 SRL/ SC BIBLIOTECA CHIMIEI SA, 2013-12)
      The characterizations of boiler ash waste from waste of palm oil industry were performed. The boiler ash was obtained from the boiler in the palm oil processing factory. The chemical and physical characterization has been ...

    • 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 ...

    • Correlation between Na 2SiO 3/NaOH ratio and fly ash/alkaline activator ratio to the strength of geopolymer 

      Mohd Mustafa Al Bakri, Abdullah; Kamarudin, Hussin, Brig. Jen. Dato' Prof. Dr.; Khairul Nizar, Ismail, Assoc. Prof. Dr.; Mohamed, Bnhussain, Prof. Dr.; Zarina, Yahya; Rafiza, Abdul Razak (Trans Tech Publications, 2012)
      Geopolymer requires an alkaline activator to induce it pozzolanic property and to accelerate the geopolymerisation process. The geopolymerisation process occurs due to the mixing of fly ash, sodium silicate and sodium ...

    • Design, processing and characterization of fly ash-based geopolymers for lightweight concrete application 

      Mohd Mustafa Al-Bakri, Abdullah; Kamarudin, Hussin, Brig. Jen. Dato' Prof. Dr.; Khairul Nizar, Ismail, Assoc. Prof. Dr.; Sandu, Andrei Victor; Mohamed, Bnhussain, Prof. Dr.; Zarina, Yahya; Rafiza, Abdul Razak (Institute for Scientific Information (ISI), 2013-04)
      The mix design of geopolymers plays important role in obtaining desirable compressive strength. Optimum mix design of geopolymers can be applied for application, such as lightweight concrete. In order to determine the ...

    • The effect of curing temperature on physical and chemical properties of geopolymers 

      Mohd Mustafa, Al Bakri Abdullah; Kamarudin, Hussin; Mohammed Amjad, Hussain; Khairul Nizar, Ismail; Zarina, Yahya; Rafiza, Abdul Razak (Elsevier BV, 2011)
      Fly ash-based geopolymers required heat to increase the geopolymerization process in order to obtain higher compressive strength. As such, geopolymer samples were prepared using different curing temperatures (room temperature, ...

    • Effect of NaOH concentration on microstructure of boiler ash based geopolymer 

      Zarina, Yahya; Mohd Mustafa, Al Bakri Abdullah; Kamarudin, Hussin; Khairul Nizar, Ismail; Abdul Rahim, Abdul Razak (Trans Tech Publications Ltd., 2015)
      Boiler ash is one of the waste material from palm oil processing industry and it was widely available. The role of alkaline activator in geopolymer is important for its mechanical properties. NaOH and sodium silicate ...

    • 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 ...

    • Microstructure studies on the effect of the alkaline activators of fly ash-based geopolymer at elevated heat treatment temperature 

      Mohd Mustafa Al-Bakri, Abdullah; Omar A., Abdulkareem; Kamarudin, Hussin, Brig. Jen. Dato' Prof. Dr.; Khairul Nizar, Ismail, Assoc. Prof. Dr.; Rafiza, Abdul Razak; Zarina, Yahya; Alida, Abdullah (Trans Tech Publications, 2013)
      Fly ash-based geopolymers are new binding materials produced to replace the ordinary Portland cement (OPC) used in concrete. In this research, the effect of alkaline activators on the compressive strength and the microstructure ...

    • 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 ...

    • The relationship of NaOH molarity, Na2SiO3/NaOH ratio, fly ash/alkaline activator ratio, and curing temperature to the strength of fly ash-based geopolymer 

      Mohd Mustafa, Al Bakri Abdullah; Kamarudin, Hussin; Mohammed Amjad, Hussin; Khairul Nizar, Ismail; Rafiza, Abdul Razak; Zarina, Yahya (Trans Tech Publications, 2011)
      Geopolymer, produced by the reaction of fly ash with an alkaline activator (mixture of Na2SiO3 and NaOH solutions), is an alternative to the use of ordinary Portland cement (OPC) in the construction industry. However, there ...

    • Reviews on the Geopolymer materials for coating application 

      Zarina, Yahya; Mohd Mustafa Al Bakri, Abdullah; Kamarudin, Hussin, Brig. Jen. Dato' Prof. Dr.; Khairul Nizar, Ismail, Assoc. Prof. Dr.; Rafiza, Abdul Razak (Scientific.Net, 2012-12)
      The application of geopolymer has been expand in many areas where before this it only used for the production of cement and concrete. One of the new applications of geopolymer is for coating. Metakaolin, fly ash and ...

    • Reviews on the properties of aggregates made with or without geopolymerisation method 

      Rafiza, Abdul Razak; Mohd Mustafa Al Bakri, Abdullah; Kamarudin, Hussin, Brig. Jen. Dato' Prof. Dr.; Khairul Nizar, Ismail, Prof. Madya Dr.; Djwantoro, Hardjito, Dr.; Zarina, Yahya (Scientific.Net/Trans Tech Publications, 2012-12)
      Aggregates are popular for use in concrete and lightweight concrete applications. Recent research shows that the by-product materials such as fly ash can be used as raw material in producing aggregates and lightweight ...

    • 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 ...

    • 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 ...