The effect of unburned carbon in palm oil fuel ash on fluidity of cement pastes containing superplasticizer

Chandara, Chea; Sakai, Etsuo; Azizli, Khairun Azizi Mohd; Ahmad, Zainal Arifin; Hashim, Syed Fuad Saiyid

doi:10.1016/j.conbuildmat.2010.02.036

Cited by 114 publications

(48 citation statements)

References 10 publications

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“…1. This process was similar to that reported previously by Zeyad et al (2013) and also by Chandara et al (2010) but without the second stage grinding. The physical properties and chemical compositions of OPC and UPOFA are provided in Table 1 and Table 2, respectively.…”

Section: Experimental Worksupporting

confidence: 77%

Improving the Engineering and Fluid Transport Properties of Ultra-High Strength Concrete Utilizing Ultrafine Palm Oil Fuel Ash

Mohammed

Johari

Zeyad

et al. 2014

ACT

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Ground treated ultrafine-POFA obtained from palm oil industry was heat-treated to remove excess carbon. The varied proportion (17%, 30% and 40%) of UPOFA was incorporated into the ultra-high strength concrete (UHSC) to study its effects on the UPOFA-UHSC (U x -UHSC) in comparison with OPC-UHSC (U 0 -UHSC) engineering and transport properties. The U x -UHSC has an increasing workability tendency with a retarded setting times as compared to U 0 -UHSC. Besides, U x -UHSC registered higher compressive strength than the U 0 -UHSC. The 90-d strength of 156 MPa was achieved in U 17 -UHSC which was 4.7%, 7.5% and 12.2% higher than the values obtained for U 30 -UHSC, U 40 -UHSC and U 0 -UHSC, respectively. The U 40 -UHSC exhibited the greatest improvement at 90 days in transport properties such as porosity, water absorption, initial surface absorption, rapid chloride permeability, gas permeability and water permeability while the highest strength was recorded with U 17 -UHSC. Thus, the pozzolanic UPOFA is capable of improving the engineering and transport properties of UHSC.

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Section: Experimental Worksupporting

confidence: 77%

Improving the Engineering and Fluid Transport Properties of Ultra-High Strength Concrete Utilizing Ultrafine Palm Oil Fuel Ash

Mohammed

Johari

Zeyad

et al. 2014

ACT

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“…The high LOI content, an indication of the high level of unburned carbon particles, can be blamed for this. Chandara et al (30) mentioned that high levels of unburned carbon particles increase the requirement Figure 3. SEM micrographs and elemental analysis of the UtSCBA used in the present study.…”

Section: Properties In Fresh State Of Mortarsmentioning

confidence: 99%

The influence of untreated sugarcane bagasse ash on the microstructural and mechanical properties of mortars

et al. 2018

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This study investigated the effects of the addition of untreated sugarcane bagasse ash (UtSCBA) on the microstructural and mechanical properties of mortars. The SCBA was sieved for only five minutes through a No. 200 ASTM mesh, and fully characterized by chemical composition analysis, laser ray diffraction, the physical absorption of gas, scanning electron microscopy (SEM) and X-ray diffraction (XRD) techniques. Mortar mixtures with 0, 10 and 20% UtSCBA as cement replacement and a constant 0.63 water/cementitious material ratio were prepared. Fresh properties of the mortars were obtained. The microstructural characteristics of the mortars at 1, 7, 28, 90 and 600 days were evaluated by SEM and XRD. The compressive strengths of the mortars at the same ages were then obtained. The results show that the addition of 10 and 20% UtSCBA caused a slight decrease in workability of the mortars but improved their microstructure, increasing the long-term compressive strength.

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“…This is because porous samples characterised by low density have had improved porosity hence increased density (Payá et al 1996). The loss on ignition (LOI) values after heat treatment is 2.3% an indication of low unburnt residue in the POFA (Chandara et al 2010). The reduction in the LOI value is compensated for by the increase in mass percentages of other oxide components.…”

Section: Experimental Programmentioning

confidence: 99%

POFA-Engineered Alkali-activated Cementitious Composite Performance in Acid Environment

Salami

Johari

Ahmad

et al. 2017

ACT

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The durability performance of palm oil fuel ash engineered alkali-activated cementitious composite (POFA-EACC) mortar exposed to different acid solutions is assessed in this study. 50 mm cubic specimens used for the study were prepared from 100% POFA, alkali-activator (Na 2 SiO 3(aq) /NaOH (aq) ) ratios of 2.5, different molarities (10, 12 and 14 M) of NaOH (aq) and 2% volume fraction of polyvinyl alcohol (PVA) fibres. Specimens were exposed to 10% H 2 SO 4(aq) , 10% HNO 3(aq) and 10% HCl (aq) at pH of 0.56, 0.52 and 0.42 respectively for 3, 6 and 9 months, with unexposed specimens as control. Small changes in compressive strength were identified with POFA mortar specimens during exposure to H 2 SO 4(aq) , while exposure to HNO 3(aq) and HCl (aq) greatly reduced the strength of the POFA mortar specimens. The results were supported through microstructural examinations using SEM, while the characterization was done using XRD and FTIR. The high resistance of POFA-EACC mortar to H 2 SO 4(aq) is the contribution received through the formation of gypsum, which hinders the infiltration of more acids into the matrix microstructure.

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The effect of unburned carbon in palm oil fuel ash on fluidity of cement pastes containing superplasticizer

Cited by 114 publications

References 10 publications

Improving the Engineering and Fluid Transport Properties of Ultra-High Strength Concrete Utilizing Ultrafine Palm Oil Fuel Ash

Improving the Engineering and Fluid Transport Properties of Ultra-High Strength Concrete Utilizing Ultrafine Palm Oil Fuel Ash

The influence of untreated sugarcane bagasse ash on the microstructural and mechanical properties of mortars

POFA-Engineered Alkali-activated Cementitious Composite Performance in Acid Environment

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