Compressive strength and microstructural analysis of fly ash/palm oil fuel ash based geopolymer mortar under elevated temperatures

Ranjbar, Navid; Mehrali, Mehdi; Alengaram, U. Johnson; Metselaar, Hendrik Simon Cornelis; Jumaat, Mohd Zamin

doi:10.1016/j.conbuildmat.2014.04.064

Cited by 290 publications

(132 citation statements)

References 36 publications

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“…10. This change has occurred in the microstructure because of sintering and further geopolymerization with the increase in temperature [23,24]. Thus, the microstructure of geopolymer specimens remained stable after exposure to high temperature and presents less mass loss at temperatures tested above 400 • C. …”

Section: Mass Lossmentioning

confidence: 85%

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Thermal Behavior of Portland Cement and Fly Ash–Metakaolin-Based Geopolymer Cement Pastes

et al. 2015

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Geopolymer specimens were prepared by combination of fly ash and metakaolin activated by sodium silicate (Na 2 SiO 3 ) and sodium hydroxide (NaOH) solutions. The effect of high temperature on the compressive strength, mass loss and shrinkage of geopolymer cement pastes and ordinary portland cement (OPC) pastes were assessed experimentally. Microstructure formation and development were characterized in terms of pore structure by mercury intrusion porosimetry. The results reveal that at temperatures exceeding 400 • C geopolymer cement paste is superior to OPC paste. Firstly, the compressive strength drops rapidly for the OPC paste to practically zero strength at 600 • C, while it drops slowly for the fly ash-metakaolin-based geopolymer cement paste to 46 MPa at 1000 • C. Secondly, while the mass loss increases for the OPC paste, it is maintained at a constant, lower value for the geopolymer cement paste. Thirdly, shrinkage of geopolymer cement paste is at least three times smaller than that of OPC paste.

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Section: Mass Lossmentioning

confidence: 85%

“…5. The shrinkage for geopolymer is likely due to sintering and further geopolymerization at elevated temperature above 600 • C which is revealed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS) [23,24].…”

Section: Shrinkagementioning

confidence: 99%

Thermal Behavior of Portland Cement and Fly Ash–Metakaolin-Based Geopolymer Cement Pastes

et al. 2015

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“…Their statement is in line with the study conducted by [6] stated that molarity and curing temperature affected the strength of geopolymer. Commonly, the curing temperatures used in geopolymer were at range 60°C to 120°C for 24 to 90 hours [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Strength Performance of Blended Ash Based Geopolymer Mortar

2018

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Abstract.Geopolymer is a based on inorganic alumino-silicate binder system. Geopolymeric materials are formed using materials that containing silica and aluminium such as fly ash and rice husk ash, which activated by alkaline solution. This paper presents the study on the effect of replacement of SSA in RHA based geopolymer, types of curing and different molarity of NaOH used on the strength of Sewage Sludge Ash (SSA) and Rice Husk Ash (RHA) based geopolymer mortar incorporating with three (3) different mix proportions. Based geopolymer mortar was synthesized from treated sewage sludge and rice husk undergoing incineration process in producing ashes, activated with sodium silicate and sodium hydroxide solution by ratio of 2.5:1 and solution to ash ratio of 1:1. Molarity of 8M and 10M NaOH were used. The percentages of SSA replacement were 0%, 10% and 20% by weight. Compressive strength was conducted at age 7, 14 and 28 days to see the development of strength with two curing regimes, which are air curing and oven curing (60°C for 24 hours). From the research conducted, the ultimate compressive strength (6.28MPa) was obtained at zero replacement of SSA taken at 28 days of oven curing with 10M of NaOH. This shows that RHA, which is rich in silica content is enough to enhance the strength of geopolymer mortar especially with high molarity of NaOH.

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“…Furthermore, fracture energy was increased with compressive strength in both types of concrete and the difference in fracture behaviors of GPC and OPC concrete is because of the higher bond and tensile strengths of GPC. Navid Ranjbar et al [10] performed XRF, XRD, TGA/DTG and FESEM analysis for finding the compressive strength behaviour of palm oil fiue ash and fly ash based mortar and found all the fly ash based geopolymer mixtures gained strength when exposed to 500°c and all the specimens lost strength when exposed to temperatures above 500 °C. The materials used in the test are fly ash, activator of sodium hydroxide and sodium silicate solutions.…”

Section: Introductionmentioning

confidence: 99%

A study on the strength development of geopolymer concrete using fly ash

Chokkalingam

Ganesan

2017

IJET

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Cement consumption is increasing day by day due to the tremendous development in the infrastructure facilities. The productio n of one ton of cement emits approximately one ton of carbon dioxide to the atmosphere. In order to reduce the use of cement a new-generation concrete has been developed such as geopolymer concrete (GPC).Geopolymer Geopolymer is a new material which has the potential to replace ordinary Portland cement. It is an inorganic material synthesiz ed by alkali activation of amorphous aluminosilicates at ambient or slightly increased temperatures having an amorphous to semi-crystalline polymeric structure. In this study, low calcium flyash from Tuticorin was used to produce geopolymer concrete. The geopolymer was synthesized with sodium silicate and sodium hydroxide solutions. The sodium hydroxide pellets was dissolved in the distilled water to make free from mixing water contaminants. The ratio of s odium silicate and sodium hydroxide ratio was kept as 2. The specimens after casting in moulds were kept in oven at 60°C for 6 hours and left to air dry at room temperature and tested at 7 and 28 days. The test results revealed the compressive strength of 30 Mpa was achieved. There was not much significant difference in strength development at 28 days between the mixes due to the increase of flyash content. The microstructural images at 28 days revealed that there was not much difference in the microstructure due to the variation in flyash content from 450 kg/m 3 to 550 kg/m 3 .

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Compressive strength and microstructural analysis of fly ash/palm oil fuel ash based geopolymer mortar under elevated temperatures

Cited by 290 publications

References 36 publications

Thermal Behavior of Portland Cement and Fly Ash–Metakaolin-Based Geopolymer Cement Pastes

Thermal Behavior of Portland Cement and Fly Ash–Metakaolin-Based Geopolymer Cement Pastes

Strength Performance of Blended Ash Based Geopolymer Mortar

A study on the strength development of geopolymer concrete using fly ash

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