Mechanical Properties of Engineered Cementitious Composite with Palm Oil Fuel Ash as a Supplementary Binder

Palm oil fuel ash (POFA) was used to produce engineered cementitious composite (ECC) in this research where ECC mixtures containing different volume of POFA (up to 55% by weight) of cement, were prepared. Mechanical properties of the resulting ECC mixtures were assessed using the compression, flexural and uniaxial tensile tests. The findings of the study show that the use of POFA improves the mechanical properties of the ECCs. The ECC mix with 1.2 POFA/cement ratio achieved a compressive strength of 30 MPa at 28 days, which is within the normal range of concrete strength for many applications. Moreover, the results portray that the use of POFA should be helpful for achieving strain-hardening behaviour. The increase in the POFA content concomitantly increased the flexural deflection and tensile strain capacities of the POFA-ECC. Furthermore, crack width of the ECC was significantly decreased with an increase of POFA content. In addition, the resulting POFA-ECC is expected to enhance the material greenness and durability.

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Prediction Model and Influence of Fe2O3 on the Mechanical Properties of Porcelain with POFA as Quartz Replacement

Materials Science Forum ◽

10.4028/www.scientific.net/msf.1010.244 ◽

2020 ◽

Vol 1010 ◽

pp. 244-249

Author(s):

Sani Garba Durumin Iya ◽

Mohamad Zaky Noh ◽

Norazreen Sharip ◽

Siti Noraiza Ab Razak ◽

A.R.M. Warikh ◽

...

Keyword(s):

Mechanical Properties ◽

Prediction Model ◽

Palm Oil ◽

Vickers Microhardness ◽

Physical And Mechanical Properties ◽

Palm Oil Fuel Ash ◽

Empty Fruit Bunches ◽

Fuel Ash ◽

Predicted Values ◽

Oil Fuel

Palm oil fuel ash (POFA) is solid waste from palm oil industries discarded after burning of shell, fiber, kernel and empty fruit bunches to heat boiler and generate electricity. A standard porcelain consisting of clay, feldspar and quartz is produced by sintering at temperature between 1300 °C to 1400 °C for toughness and translucency. This research developed a prediction model for optimum physical and mechanical properties of porcelain by addition of Fe2O3 at 5 wt.%. Quartz was replaced with POFA powder at 15 wt.% and Fe2O3 was also added at 5 wt.% of POFA mixed with others porcelain composition. Then the powder was dry pressed into pellet at 91 MPa and the samples were sintered at 1150 °C. The bulk density, compressive strength and Vickers microhardness were found to increase by addition of Fe2O3 at 5 wt.%. Prediction model was developed and from the predicted values it is revealed that, the model is efficient and good for the purpose of this research.

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The Effect of Eggshell Powder as an Accelerator for Blended Cement Concrete

Journal of Computational and Theoretical Nanoscience ◽

10.1166/jctn.2020.8762 ◽

2020 ◽

Vol 17 (2) ◽

pp. 1032-1036

Author(s):

Nur Nadhira Abdul Rasid ◽

Abdul Rahman Mohd. Sam ◽

Azman Mohamed ◽

Nor Hasanah Abdul Shukor Lim ◽

Zaiton Abdul Majid ◽

...

Keyword(s):

Calcium Oxide ◽

Palm Oil ◽

Concrete Strength ◽

Strength Development ◽

Early Age ◽

Palm Oil Fuel Ash ◽

Fuel Ash ◽

Early Strength ◽

Oil Fuel ◽

Silica Oxide

Blended concrete has later strength development with long maturity strength development. An accelerator is thus needed to enhance the early strength development of concrete. This paper shows the combination of ground palm oil fuel ash and eggshell powder that was designed for later and early strength development, respectively. Two types of eggshell powder were utilised in concrete: uncarbonised eggshell powder and decarbonised eggshell powder. The study was initiated with compression test for concrete curing at age 1, 3, 7, and 28 days followed by rapid evaluation test of setting time to investigate the preliminary performance between materials. The results revealed decarbonised eggshell powder as a high accelerator that can improve the early age of concrete strength development. Meanwhile, despite showing the best performance, uncarbonised eggshell powder is a very low accelerator thus not fit the purpose. In conclusion, the combination of ground palm oil fuel ash (rich with silica oxide) and decarbonised eggshell powder (rich with calcium oxide) provided dual function, where ground palm oil fuel ash and decarbonised eggshell powder took later and early strength development, respectively. The combination between silica oxide and calcium oxide in cementitious materials has potential to be utilised to enhance the early age of a blended concrete strength development.

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