The Effect of Curing Temperature on Physical and Chemical Properties of Geopolymers

Bakria, A.M. Mustafa Al; Kamarudin, H.; Binhussain, Mohammed; Nizar, Ismail Khairul; Yahya, Zarina; Rafiza, A.R.

doi:10.1016/j.phpro.2011.11.045

Cited by 166 publications

(68 citation statements)

References 18 publications

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“…Compressive strength results, shown in Figure 12.5, indicate that increasing the curing temperature from room temperature to 70 C increases the compressive strength of the geopolymeric masonry bricks. Nevertheless, the compressive strength of geopolymeric masonry bricks slightly decreased from 18.9 to 17.4 MPa with an increase in the curing temperature from 70 to 80 C. The results from this research agreed with that of other researchers who also studied the effect of curing temperature on the properties of fly ash-based geopolymeric materials (Fareed, Muhd Fadhil, Samuel, & Nasir, 2011;Hardjito, Wallah, Sumajouw, & Rangan, 2004;Mustafa Al Bakri et al, 2011;Swanepoel & Strydom, 2002). Therefore, it can be concluded that the rate of geopolymerization reaction depends on the heat treatment for the strength development of geopolymeric masonry bricks.…”

Section: Influence Of Curing Temperaturesupporting

confidence: 89%

The properties and durability of fly ash-based geopolymeric masonry bricks

Ibrahim

Tahir

2015

Eco-Efficient Masonry Bricks and Blocks

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Section: Influence Of Curing Temperaturesupporting

confidence: 89%

The properties and durability of fly ash-based geopolymeric masonry bricks

Ibrahim

Tahir

2015

Eco-Efficient Masonry Bricks and Blocks

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“…4 and 5) show the typical amorphous hump in the XRD patterns at around 28 2θ° even after curing at 150 °C for up to 48 hr (Figure 4), as is also the case for the samples cured at 180 °C for up to 30 hr ( Figure 5). However, the XRD trace of sample cured for 48 hr at 180 °C (Figure 4) 7.23 (PDF# 01-085-0976), as well as quartz and minor amounts of anatase, the latter two being originally present in the metakaolin (Figure 1). …”

Section: X-ray Diffraction (Xrd)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Among the different geopolymer materials, metakolin-and fly ash-based geopolymers activated by alkali were found to have an optimum curing temperature in air of 60 °C (6,7). However when these geopolymer samples were cured at temperatures >60 °C, the compressive strength decreased (7). Based on the current knowledge of geopolymers, the facile preparation procedure for a chemically stable metakaolin geopolymer can be summarized as follows: setting and curing of the reagents (a solid aluminosilicate source and an alkali silicate solution) occurs at room temperature in a mould which provides a moisture level of about 40% (8).…”

Section: Introductionmentioning

confidence: 99%

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K-Based Geopolymer from metakaolin: roles of K/Al ratio and water or steam Curing at different temperatures

Tawfik¹,

Abd-El-Raoof²,

Katsuki³

et al. 2016

Mater. construcc.

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K-based geopolymer binder was prepared by reacting metakaolin with alkaline solutions having different potassium contents and by water curing at room temperature and 80 °C as well as steam curing at 150 and 180 °C. The phase formation, microstructure and Al and Si nearest neighbor environments were studied using XRD, TEM and 27 Al and 29 Si MAS NMR spectroscopy, respectively. The results revealed that amorphous alumino-silicates were predominant in geopolymer prepared by curing up to 28 days at room temperature or at 80 °C. The amorphous alumino-silicates persisted after hydrothermal treatment at 150 °C/48 hrs and even at 180 °C/30 hrs. However, the samples cured hydrothermally at 180 °C/48 hrs revealed formation of crystalline potassium aluminum silicate and chabazite phases. The Al nearest neighbor environments was not significantly affected by increasing the K/Al ratio up to 1.55 or by the curing temperatures. On the other hand, the geopolymer reaction appears to have increased when cured at 80 °C or steam cured at 150° and 180 °C and crystalline aluminosilicates resulted when the geopolymer sample was hydrothermally treated at 180 °C/48 hrs. RESUMEN: Geopolímeros de metakaolin basados en potasio: papel de la relación K/Al y del curado en agua o con vapor a diferentes temperaturas.Se prepararon geopolímeros por reacción de metacaolín con disoluciones alcalinas con diferentes contenidos de potasio. Se realizó un curado con agua a temperatura ambiente y a 80 °C, y con vapor de agua a 150 y 180 °C. La formación de las diferentes fases así como la microestructura y entornos del Al y Si se estudiaron mediante DRX, TEM y espectroscopia de RMN MAS de 27 Al y 29Si. Los aluminosilicatos amorfos fueron predominantes en aquellos geopolímeros sometidos a curado de hasta 28 días a temperatura ambiente o a 80 °C. Los aluminosilicatos amorfos persistieron tras el tratamiento hidrotermal a 150 °C/48 horas e incluso a 180 °C/30 h. Sin embargo, las muestras curadas hidrotermalmente a 180 °C/48 h revelaron la formación de fases cristalinas de silicatos de aluminio y potasio, así como de chabazita. Los entornos de Al no resultaron afectados significativamente por el aumento de la relación K/Al de hasta 1.55, ni por las temperaturas de curado. Por otro lado, la reacción de geopolimerización aumentó cuando el curado se realizó a 80 °C o con curado a vapor a 150 y 180 °C.PALABRAS CLAVE: Geopolímero basado en potasio; Curado con vapor; Distribución de tamaño de partículas; Resonancia Magnética Nuclear (RMN)

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“…However previous research shows that one of challenges in the application of low calcium fly ash based geopolymer as binder is its setting process needs relatively high curing temperature 60°C-120°C for 6 -24 hours [2][3][4][5][6][7]. This conditions limit the application of geopolymer for precast purposes whilst for normal concrete, the binder should be able to set in room temperature.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Lime Addition on the Setting Time and Strength of Ambient Cured Fly Ash Based Geopolymer Binder

Adam

Amiri

Suarnita

et al. 2016

MATEC Web of Conferences

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Abstract.One of the limitations of geopolymer as the alternative binders in concrete is the necessity of heat curing. This study aimed to produce fly ash geopolymer binder subjected to ambient curing by adding a small proportion of lime and varying the activator dosage. The Class F fly ash from Mpanau coal-fired power plant was mixed with alkaline solution consists of sodium silicate and sodium hydroxide with Na2O dosage of 5%, 7%, and 9%. To achieve ambient cured paste, 8%, 9%, and 10% slaked lime was added as the substitute for the fly ash. The setting time test was conducted for each mix and the compressive strength was performed at age of 7, 14 and 28 days. The test result shows that the setting time of the fly ash based geopolymer paste can be controlled by adding a small proportion of slaked lime. The addition of lime increased strength but decreased the setting time.

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The Effect of Curing Temperature on Physical and Chemical Properties of Geopolymers

Cited by 166 publications

References 18 publications

The properties and durability of fly ash-based geopolymeric masonry bricks

The properties and durability of fly ash-based geopolymeric masonry bricks

K-Based Geopolymer from metakaolin: roles of K/Al ratio and water or steam Curing at different temperatures

The Effect of Lime Addition on the Setting Time and Strength of Ambient Cured Fly Ash Based Geopolymer Binder

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