Experimental study on the synthesis and characterization of aplite rock-based geopolymers

Khalifeh, Mahmoud; Saasen, Arild; Vrålstad, Torbjørn; Larsen, Helge B.; Hodne, Helge

doi:10.1080/21650373.2015.1044049

Cited by 31 publications

(24 citation statements)

References 27 publications

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“…An aplite rock was used as a source of aluminosilicate material. [14] A commercial microsilica (Grade 955, delivered by Elkem, Norway) and a commercial Ground Granulated Blast Furnace Slag, GGBFS, ("Merit 5000" delivered by Merit 5000, Sweden) were used as additives to adjust the chemical composition of the rock. Table 1 presents the chemical composition of the aplite rock, GGBFS and microsilica.…”

Section: Methodsmentioning

confidence: 99%

“…They studied the characteristics and reactivity of the aplite rock as a geopolymeric precursor, synthesized the aplite-based geopolymers and eventually characterized the synthesized geopolymers. [14] With the exception of longterm integrity perspectives, the use of aplite-based geopolymers for oilfield applications has been suggested by Khalifeh et al [14][15][16].…”

Section: Introductionmentioning

confidence: 98%

“…[12,13] Therefore, to consider the usability of these geopolymers as an alternative to Portland cement, it is important to study its long-term durability in addition to its placeability and initial mechanical properties. Khalifeh et al [14] synthesized a new geopolymeric material, aplite-based, from a naturally occurring mineral. They studied the characteristics and reactivity of the aplite rock as a geopolymeric precursor, synthesized the aplite-based geopolymers and eventually characterized the synthesized geopolymers.…”

Section: Introductionmentioning

confidence: 99%

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Long-term durability of rock-based geopolymers aged at downhole conditions for oil well cementing operations

Khalifeh

Todorović

Vrålstad

et al. 2016

Journal of Sustainable Cement-Based Materials

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The long-term integrity of rock-based geopolymers was studied in corrosive environments. The geopolymers were cured for 7 days at ambient conditions. Afterwards, the geopolymers were exposed to crude oil, brine and H 2 S in brine at 100°C and elevated pressures. The compressive strength, tensile strength, weight and volume changes were measured prior and after 3, 6 and 12 months of exposure. The measurements showed a turning point after 6 months of ageing. Whereas the compressive strength and tensile strength started to increase when the specimens were exposed to crude oil and brine, the specimens that were exposed to H 2 S experienced some degradation. Permeability of geopolymers before exposure and after 12 months of exposure to the crude oil and brine was very low. The permeability of the specimens which were exposed to H 2 S was not measureable. Substantial volume changes were observed for the geopolymers which were exposed to H 2 S and brine.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Long-term durability of rock-based geopolymers aged at downhole conditions for oil well cementing operations

Khalifeh

Todorović

Vrålstad

et al. 2016

Journal of Sustainable Cement-Based Materials

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“…However, the compressive strength of the binder is higher for the Kcontaining systems than for the Na-containing systems [2,24,25]. This phenomenon is explained by the size of K + cations and the formation of zeolite in the geopolymer structure [26]. Therefore, to get the same strength as the K-containing system, the amount of sodium solution may be increased.…”

Section: Effect Of Alkali Solutionmentioning

confidence: 99%

Development and Characterization of Norite-Based Cementitious Binder from an Ilmenite Mine Waste Stream

Khalifeh

Saasen

Larsen

et al. 2017

Advances in Materials Science and Engineering

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Norite is a major type of solid waste generated during the production of ilmenite. This study focuses on the usability of norite as a solid precursor of alkali-activated cement. Sensitivity analysis was performed to find the influence of different alkali types and particle sizes of the source material on polycondensation. Norite was ground and mixed with sodium hydroxide and potassium hydroxide solutions to produce a binder. Potassium-containing systems were more effective compared to sodium-containing systems with respect to strength development. The X-ray diffraction patterns indicated formation of zeolites, albite, and oligoclase based on the type of activator and used additives. The patterns also revealed formation of an amorphous phase in the matrices of the binder that was cured at 87 ∘ C. Microstructure analysis revealed some degree of crystallization with different Si : Al ratios, which indicated heterogeneity of the binder matrices.

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“…Many previous works have reported the formation of geopolymer materials from calcined clays [9] [10], granulated blast furnace slag and fly ash as industrial by-products or wastes [11] [12], volcanic ashes [13] [14] [15], ground perlite [16], ground aplite rock [17], granite waste [18], Taftan and esite and Shahindej [19], alkali-feldspars [20] [21], a pumice-type natural pozzolan [22], basaltic ash [23].…”

Section: Introductionmentioning

confidence: 99%

Preliminary Study of Alkali Activation of Basalt: Effect of NaOH Concentration on Geopolymerization of Basalt

Saraya¹,

El-Fadaly²

2017

MSCE

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The main objective of this study is to examine the possibility of using fresh basalt powder in the preparation of geopolymer pastes. Four NaOH concentrations of 2.5, 5, 7.5 and 10 M were used to alkali activation of basalt. In addition, effect of curing temperature at ambient, 45˚C and 65˚C were studied. The geopolymer pastes were investigated using FTIR, XRD and SEM-EDS techniques as well as compressive strength up to 90 days. The results were shown the compressive strength of prepared geopolymer increased with concentration of alkali activator up to 90 days. On the other hand, the compressive strength of prepared geopolymer pastes were improved with increased curing temperature. The results showed that there was a change in the chemical and mineral structure, due to the reaction of the sodium hydroxide with the different minerals of the basalt. In addition, the Na/Al and Si/Al ratios were completely different from that of the raw basalt. The geopolymerization reactions occurred at the surface basalt and the unreacted basalt particles actually play a supporting role in the geopolymer properties.

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Experimental study on the synthesis and characterization of aplite rock-based geopolymers

Cited by 31 publications

References 27 publications

Long-term durability of rock-based geopolymers aged at downhole conditions for oil well cementing operations

Long-term durability of rock-based geopolymers aged at downhole conditions for oil well cementing operations

Development and Characterization of Norite-Based Cementitious Binder from an Ilmenite Mine Waste Stream

Preliminary Study of Alkali Activation of Basalt: Effect of NaOH Concentration on Geopolymerization of Basalt

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