Thermal Analysis and Pozzolanic Index of Rice Husk Ash at Different Grinding Time

Ramadhansyah, P. J.; Mahyun, Ab Wahab; Salwa, Mohd Zaini Makhtar; Bakar, B.H. Abu; Johari, Megat Azmi Megat; Ibrahim, Mohd Haziman Wan

doi:10.1016/j.proeng.2012.10.013

Cited by 13 publications

(10 citation statements)

References 15 publications

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“…ese pores contribute to the RHA's high chemical reactivity and very large specific surface area. Ramadhansyah [25] evaluated how the mineralogical composition and the RHA's PAI was influenced by variation in temperature and grinding. RHA samples were calcinated at 700°C for 6 hours at 10°C/minute heating rate.…”

Section: Introductionmentioning

confidence: 99%

Evaluating the Effect of Calcination and Grinding of Corn Stalk Ash on Pozzolanic Potential for Sustainable Cement‐Based Materials

Memon

Khan

Wahid

et al. 2020

Advances in Materials Science and Engineering

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In developing countries, one of the usual practices is the uncontrolled, open burning of corn stalk (CS) or its utilization as a fuel. It is known that the ash obtained under uncontrolled burning conditions constitutes blackish and unburnt carbon particles as well as whitish and grayish particles (representing crystallization of silica) due to over burning. However, controlling the burning process can improve the quality of ash produced to effectively use it in cement-based materials. Hence, this research was aimed at exploring the pozzolanic properties of corn stalk ash upon calcination and grinding, for it to be used in the manufacturing of sustainable cement-based materials. In order to obtain a suitable corn stalk ash (CSA), which can be used in cement/concrete, a research investigation consisted of two phases. In the first phase, calcination was carried out at 400°C, 500°C, 600°C, 700°C, and 800°C for 2 hours. The tests applied on the resulting ashes were weight loss, XRD, pozzolanic activity index (PAI), Chapelle, Fratini, and consistency. From XRD spectra, it was found that, at lower temperatures, silica remained amorphous, while it crystallized at higher temperature. Ash combusted at a temperature of 500°C possessed largest pozzolanic activity of 96.8%, had a Fratini CaO reduction of 93.2%, and Chapelle activity of 856.3 mg/g. Thus, 500°C was chosen as an optimum calcination temperature. In the second phase, the ash produced at 500°C was grinded for durations of 30, 60, 120, and 240 minutes to ascertain the optimum grinding times. Resulting ashes were examined for hydrometer analysis, Blaine fineness, Chapelle activity, and pozzolanic activity. Experiment outcomes revealed a direct relationship between values of Blaine fineness, surface area, Chapelle activity, PAI, and grinding duration. It was concluded that CSA can be used as a pozzolan, and thus, its utilization in cement/concrete would solve ash disposal problems and aid in production of eco-friendly cement/concrete.

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Section: Introductionmentioning

confidence: 99%

Evaluating the Effect of Calcination and Grinding of Corn Stalk Ash on Pozzolanic Potential for Sustainable Cement‐Based Materials

Memon

Khan

Wahid

et al. 2020

Advances in Materials Science and Engineering

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“…Carbonisation is defined as the RH decomposition at temperatures greater than 300°C which has liberated combustible gas and tar. Meanwhile, decarbonation is the fixed carbon combustion that exists in the RH char in the presence of oxygen at higher temperature (Ramadhansyah et al , 2012). Besides that, the greater mass loss was because of loss of constitutive water, volatile materials and carbon combustion (Vieira et al , 2012).…”

Section: Resultsmentioning

confidence: 99%

Study of the mechanical and the thermal insulation properties of polyurethane coating containing chicken eggshell and rice husk ash as fillers

Ang

Ahmad

Ong

et al. 2016

PRT

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Purpose The main aim of this study was to examine the effects of chicken eggshell (CES) and rice husk ash (RHA) as fillers on the mechanical and the thermal insulation properties of polyurethane coatings. Design/methodology/approach CES and RHA were ground via ball milling set at different parameters, and the smallest particles size obtained were selected and used as fillers. Fillers of different weight proportions were mixed with other components such as binder, solvent and pigment to form various coating formulations and test samples were made via dip coating. A series of characterisations were conducted to analyse the thermal and mechanical properties of the coating. Findings The smallest particle size of CES and RHA was obtained after both of them had undergone grinding process at 400 rpm within 180 min. Morphological studies revealed that CES and RHA have irregular shape and high porosity. In crystallographic analysis, CES mainly composed of pure calcite crystal structure and RHA contained amorphous silica. Both of fillers were found thermally stable up to 520 and 710°C for RHA and CES, respectively. In RHA individual system, as the RHA proportion increases, the thermal conductivity of the coating declined. In contrast, in the CES coating system, the thermal conductivity demonstrated an opposite trend. Thermal gravimetric analysis results displayed that by adding hybrid fillers, the residue weight and the thermal stability of the coatings were increased. In addition, the adhesion strength of the coating was increased as the filler weight content increased. Research limitations/implications Fillers with nano-range size were expected to be produced in this research for better performance of the coating. However, the obtained fillers were limited to micron size through dry grinding method. Another drawback in this research was the coating technique which is dip coating. The coated substrates do not have uniform coating thickness and this subsequently influenced the performance. Originality/value A novel attempt has been made to study the formulation coating system by mixing CES and RHA as fillers which is also known as a hybrid system.

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“…Permeability of the concrete is one of the main parameters that could represent the durability performance of the concrete [19]. Fig.…”

Section:  Water Permeabilitymentioning

confidence: 99%

Influence of Partial Replacement of Cement and Sand with Coal Bottom Ash on Concrete Properties

Al-Fasih¹,

Haziman²,

Fasihah³

et al. 2019

IJRTE

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 Abstract: An experimental study was accomplished to study the effect of replacement of both cement and sand with coal bottom ash (CBA) on the properties of the concrete. Control mix was prepared without coal bottom ash replacement and nominated as series A. The mixes of series B were prepared with20 % replacement of cement with 30 hours ground coal bottom ash (GCBA). Mixes of series C were prepared with four percentages (5,10,15,20) of CBA as partial replacement of sand. Mixes of Series D mixes were prepared as a combination of series B and C. Slump flow, compressive strength, and water permeability properties were investigated. Series D mixes showed lower workability compared to the series C mixes and control mix.Compressive strength of series D mix gained slightly higher strength compared to the control mix but lower than series C strength. Series C mixes absorbed more water compared to control mix concrete. Series D mixes achieved lower water permeability coefficient compare to series C which showed lower water permeability than the control.

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Thermal Analysis and Pozzolanic Index of Rice Husk Ash at Different Grinding Time

Cited by 13 publications

References 15 publications

Evaluating the Effect of Calcination and Grinding of Corn Stalk Ash on Pozzolanic Potential for Sustainable Cement‐Based Materials

Evaluating the Effect of Calcination and Grinding of Corn Stalk Ash on Pozzolanic Potential for Sustainable Cement‐Based Materials

Study of the mechanical and the thermal insulation properties of polyurethane coating containing chicken eggshell and rice husk ash as fillers

Influence of Partial Replacement of Cement and Sand with Coal Bottom Ash on Concrete Properties

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