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Articles by Roszilah Hamid
Total Records ( 5 ) for Roszilah Hamid
  M.F.M. Zain , Suhad M. Abd , Roszilah Hamid and M. Jamil
  In this study, the potential for utilising properties of concrete as a powerful tool to predict its compressive strength at different ages has been realised. Novel mathematical models were proposed and developed using multiple non-linear regression equations to predict the concrete strength. The variables used in the prediction models, such as the mix proportion elements, were statistically analysed. According to the analysis, the models provided a good estimation of compressive strength and yielded good correlations with the data used in this study. The correlation coefficients were 0.995 for the prediction of 7- and 28-day compressive strength. Moreover, the proposed models proved to be a significant tool in predicting the compressive strength of different concretes despite variations in the data used to validate the model.
  Rahel Kh. Ibrahim , Kambiz Ramyar , Roszilah Hamid and Mohd Raihan Taha
  In this research the effect of high temperature on the compressive strength of silica incorporated mortar specimens have been studied. For this purpose prismatic mortar specimens containing 0, 5 and 10% silica fume substituted for cement with different w/b ratios and cured at different ages were prepared. The compressive strength before and after exposure to high temperatures of 300 and 600°C were recorded. It was observed that silica fume incorporated mortars has no potential effects in the face of fire hazardous.
  Fatin Nabilah Tajul Ariffin , Yusof Abdullah , Roslinda Shamsudin , Roszilah Hamid and Sahrim Haji Ahmad
  Concrete nuclear reactors could be improved in terms of life safety by adding boron carbide. This study presents an experimental investigation of the physical, mechanical and microstructural properties of Portland cement concrete containing boron carbide (B4C) as a neutron radiation-absorbing material for nuclear reactor applications. The boron carbide powder additions were 5 and 20% of the cement weight. The water-to-cement ratio of the concrete design mix was 0.4. The results show that the concrete density decreased as the percentage of boron carbide content increased. The results also show that concrete with a 0% content of B4C produced the highest compressive strength (32.73 MPa) and that the addition of 5 and 20% B4C produced a negligible reduction of strength (<2% compared with 0% B4C concrete). Scanning Electron Microscopy (SEM) results confirm that the addition of boron carbide to Portland cement concrete reduces the strength and density of concrete because the morphology of samples containing 5 and 20% B4C by weight (wt.) shows a more porous concrete microstructure compared with the control samples. Energy Dispersive X-ray (EDX) analysis was used to conclude that the higher content of B4C results in a lower percentage of calcium in the concrete which in turn reduces the strength. Up to 20% B4C powder by weight can be added to concrete which produces minimal strength reduction.
  Noor Azim Mohd Radzi , Roszilah Hamid and Azrul A. Mutalib
  This review compiles the methodologies, issues and challenges regarding small-scale fire tests on tunnel lining concrete. First, this review examines testing, including furnace tests on specimens of actual and reduced dimensions and on site mobile furnace tests. Second is a discussion of the issues surrounding the tests, including the effects of loading, size reduction, inclusion of reinforcement and differences in the properties of actual and laboratory specimens. The major challenge with small-scale testing is there still no reliable theoretical method to predict concrete spalling due to fire exposure. Present contributions to the development of fireproof concrete also support the progress of small-scale fire testing of tunnel lining concrete.
  Husen Alhawat , Roszilah Hamid , Shahrizan Bahroom and Mohamed H. Mussa
  This review gathers the methodologies, issues and challenges concerning to large-scale fire experiments on concrete tunnel lining. Firstly, the study reviews fire testing of concrete tunnel lining, large-scale rather than small-scale and effect of tunnel fire on spalling of fireproof concrete. Secondly, issues surrounding the tests, including new fireproof concretes which involves high strength, high performance which normally containing various pozzalanic cementitious materials such as fly ash, silica fume and nanosilica which are very dense and behave explosively during fire are discussed. The main challenge for large-scale testing is that the influenc es of the specific spalling measures are difficult to predict and compare with others given the distinctions in testing setups and types of fire curves that are applied to obtain results. Current contributions in large scale fire testing are to improve fire-resistant concrete and to support the advancement of the large-scale fire testing of concrete tunnel lining.
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