Journal Articles

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https://hdl.handle.net/20.500.14170/296

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Browsing Journal Articles by Subject "Aggregate impact value"
  • Publication
    Influence of Recycled Concrete Aggregate (RCA) towards the performance of Hot-Mix Asphalt (HMA) mixture
    (The World Academy of Research in Science and Engineering, 2020)
    Significant use of Recycled Concrete Aggregate (RCA) has been applied by many countries especially in Hot-Mix Asphalt (HMA) as can possibly improve road construction in the economic and environmental aspects. However, in spite of such promising potentials, insufficient and inconclusive data to be referred based on previous study causes further study to be conducted as to focus more on the performance of aggregate in term of the impact and crushing value by using RCA. Also, to investigate the influence of different percentage 0%, 10%, 20%, 30% and 40% of RCA in the HMA mixture to the Marshall stability, flow value and water absorption. When the percentage of RCA content increase, the performance of all the parameters has become weaker and lowered. But then, RCA still can be used in the HMA as the differences in the performances with the natural aggregate is slightly small. Therefore, the optimum percentage of RCA got on this study is 30% by referred and discussed on all the five parameters. In conclusion, RCA is a great material that can be used to replace natural aggregate as it contributes great benefit in the environment aspect and also helps in the reduction of stockpiles of concrete wastes.
  • Publication
    Optimization of NaOH molarity, LUSI mud/alkaline activator, and Na₂SiO₃/NaOH ratio to produce lightweight aggregate-based geopolymer
    ( 2015)
    Rafiza Abd Razak
    ;
    Mohd. Mustafa Al Bakri Abdullah
    ;
    Djwantoro Hardjito
    ;
    Kamarudin Hussin
    ;
    Khairul Azwan Ismail
    ;
    Zarina Yahya
    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 SI-Sidoarjo, meaning mud from Sidoarjo which erupted near the Banjarpanji-1 exploration well in Sidoarjo, East Java, Indonesia on 27 May 2006. The effect of NaOH molarity, LUSI mud/Alkaline activator (LM/AA) ratio, and Na₂SiO₃/NaOH ratio to the ALGA are investigated at a sintering temperature of 950 °C. The results show that the optimum NaOH molarity found in this study is 12 M due to the highest strength (lowest AIV value) of 15.79% with lower water absorption and specific gravity. The optimum LUSI mud/Alkaline activator (LM/AA) ratio of 1.7 and the Na2SiO3/NaOH ratio of 0.4 gives the highest strength with AIV value of 15.42% with specific gravity of 1.10 g/cm3 and water absorption of 4.7%. The major synthesized crystalline phases were identified as sodalite, quartz and albite. Scanning Electron Microscope (SEM) image showed more complete geopolymer matrix which contributes to highest strength of ALGA produced.
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