Effect of curing temperature on geopolymerization of metakaolin-based geopolymers

Mo, Bing-hui; Zhu, Hongyu; Cui, Xuemin; He, Yan; Gong, Sha

doi:10.1016/j.clay.2014.06.024

Cited by 268 publications

(113 citation statements)

References 17 publications

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“…Geopolymerisation process can be referred as alkaline activation where it transforms the amorphous phase of source materials into composite which have binding property [5][6]. The presence of strong alkaline solution such as sodium hydroxide (NaOH), potassium hydroxide (KOH), water glass or their combinations are required for geopolymerisation to occur.…”

Section: Introductionmentioning

confidence: 99%

Comparative study on early strength of sodium hydroxide (NaOH) activated fly ash based geopolymer

Yahya

Talib

Razak

2017

AIP Conference Proceedings

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Abstract. The urge to reduce carbon dioxide (CO2) emission has encourage researchers to introduce environmental friendly binder or known as geopolymer. This new binder was produced by mixing source materials rich in silica and alumina with alkaline liquids. For this study, class F fly ash was used as source material with two different types of alkaline activator; sodium hydroxide (NaOH) only and a combination of water glass with NaOH. The different concentration of the NaOH solutions (8M, 10M, 12M and 14M) is used in the production of geopolymer. The parameters such as curing regime, solid/liquid ratio, and water glass/NaOH ratio are controlled in the study. The samples with combination of NaOH and water glass as alkaline activator were prepared by mixing these two solution and stirred for 2 minutes. Then this solution were mixed together with fly ash for 3 minutes and casted in the mould. The performance of the fly ash based geopolymer are evaluated by the compressive strength, water absorption and density at the early age of 1th, 3th and 7th days. Based on the study, at a concentration of 14M on 7th days had achieved the maximum compressive strength of 7.1 MPa for samples activated with NaOH only. Meanwhile, for geopolymer samples activated with a combination of the water glass and NaOH, the maximum strength of 33.33 MPa was recorded on 7th days of testing with NaOH concentration of 12 M. The water absorption for all geopolymer samples were ranging from 2.04 % to 2.78%, which are below the limit (3%). While the density of the geopolymer paste were in the range of 1552 kg/m3 to 1680 kg/m3, which are below the limit (2400 kg/m3). From the standpoint of strength of hardened geopolymer samples, the most effective alkaline activator in geopolymer is the combination of NaOH and water glass.

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Section: Introductionmentioning

confidence: 99%

Comparative study on early strength of sodium hydroxide (NaOH) activated fly ash based geopolymer

Yahya

Talib

Razak

2017

AIP Conference Proceedings

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“…Geopolymers are a class of cementitious aluminosilicate binder materials synthesized by a geopolymerization reaction between alumino-silicate oxides and alkali-metal silicate solutions under alkaline conditions, with partially or fully amorphous polymeric structures containing tetrahedral SiO 4 and AlO 4 randomly distributed along the polymeric chains [8][9][10][11]. The researches on the geopolymerization mechanism in this system are attracting more and more attentions, and the process may be summarized briefly as follows: dissolution, rearrangement, condensation and re-solidification [12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Si/Al on Mechanical Properties and Fracture Behavior of Stainless Steel Mesh/Cr_pReinforced Geopolymer Composites

Yuan

Jia

2017

MATEC Web Conf.

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Abstract. In this study, a series stainless steel mesh/Cr p reinforced geopolymer composites with different Si/Al molar ratio (N) were designed and prepared, where N = 1.75, 2 and 2.25, respectively. The effect of Si/Al molar ratio in the geopolymer matrix on mechanical properties and fracture behavior of the geopolymer composites were investigated. The microstructure of geopolymer became more compact when Si/Al increased from 1.75 to 2, which was beneficial to the improvement of geopolymer's mechanical properties. And continuing to rise to 2.25 for Si/Al, the completely curing of geopolymer composites required more time compared with lower Si/Al, which can be attributed to the different microstructure and chemical composition caused by the different Si/Al. The optimum Si/Al molar ratio was about 2 at which the composites samples present the best mechanical properties with the flexure strength of 115.3 MPa and elastic modulus of 11.0 GPa, respectively. The results of fracture behavior suggested that geopolymer composites with N is 2.25 displayed the behavior characteristics of metal materials, which can be attributed to a poor integrated condition in interface between reinforcements and geopolymer matrix.

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“…For example, at the 80°C and 100°C curing temperatures, the 7-day compressive strengths of the deriving geopolymers were lower than those by 60°C curing, although their 1-day and 3-day compressive strengths were very close (Mo et al, 2014). Jian et al (2014) proposed a scheme that is to seal the cast specimens in moulds and cured at 50°C for 9 days followed by room temperature curing to achieve high strength.…”

Section: Effects Of Curing Schemementioning

confidence: 94%

Geopolymer from kaolin in China: An overview

Zhang¹,

Zhu

Zhou

et al. 2016

Applied Clay Science

195

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Effect of curing temperature on geopolymerization of metakaolin-based geopolymers

Cited by 268 publications

References 17 publications

Comparative study on early strength of sodium hydroxide (NaOH) activated fly ash based geopolymer

Comparative study on early strength of sodium hydroxide (NaOH) activated fly ash based geopolymer

The Effect of Si/Al on Mechanical Properties and Fracture Behavior of Stainless Steel Mesh/Cr_pReinforced Geopolymer Composites

Geopolymer from kaolin in China: An overview

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Effect of curing temperature on geopolymerization of metakaolin-based geopolymers

Cited by 268 publications

References 17 publications

Comparative study on early strength of sodium hydroxide (NaOH) activated fly ash based geopolymer

Comparative study on early strength of sodium hydroxide (NaOH) activated fly ash based geopolymer

The Effect of Si/Al on Mechanical Properties and Fracture Behavior of Stainless Steel Mesh/CrpReinforced Geopolymer Composites

Geopolymer from kaolin in China: An overview

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The Effect of Si/Al on Mechanical Properties and Fracture Behavior of Stainless Steel Mesh/Cr_pReinforced Geopolymer Composites