Synthesis and characterization of geopolymer binders based on local materials from Burkina Faso – Metakaolin and rice husk ash

Sore, Seick Omar; Messan, Adamah; Prud’Homme, Elodie; Escadeillas, Gilles; Tsobnang, F.

doi:10.1016/j.conbuildmat.2016.07.102

Cited by 81 publications

(30 citation statements)

References 36 publications

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“…Similarly, an increase in the curing period also changes the failure mode from ductile to brittle, perhaps due to the formation of micro cracks. Clearly, the mechanical properties are time-dependent, which is similar to previous studies using metakaolin, fly ash, red mud, and rice husk based geopolymers [20,41]. From Figure 5d, it is noted that even at 28 days of curing, the strength shows an upward trend without reaching a The stiffness (i.e., the Young's modulus, E) of the specimens also improved with increase in the curing period and fly ash content as seen from E = 0.06, 0.34, and 0.63 GPa at 28 days curing for FA4, FA6, and FA8 respectively (see Table 4).…”

Section: Parametric Influences On Mechanical Propertiessupporting

confidence: 85%

Mechanical Properties of Geopolymers Synthesized from Fly Ash and Red Mud under Ambient Conditions

Koshy

Dondrob

et al. 2019

Crystals

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Aluminosilicate gels form geopolymers and nanocrystalline zeolites which have comparable strength properties, making them a potential replacement for ordinary Portland cement. The study explores the use of two untreated industrial wastes, Class-F fly ash and red mud, for synthesizing geopolymeric material at ambient synthesis conditions. The high alkalinity present in the red mud was exploited for the dissolution of silica in the fly ash and red mud. The mechanical, mineralogical, microstructural, and pore characteristics were analyzed and the contributions of curing period, Si/Al, Na/Al, and liquid-to-solid (L/S) ratios on the compressive strength of the end products were also investigated. The alkalinity of the system due to the red mud was adequate for the dissolution of raw fly ash and the subsequent formation of aluminosilicate gels. The strength of the end product was directly proportional to the initial Si/Al ratio and the specimens with highest fly ash content exhibited highest compressive strength values after 28 days of curing. Furthermore, fly ash contributed to the formation and distribution of interstitial and capillary pores in the aluminosilicate matrix. The lowest L/S ratio of the initial mix resulted in the end product with the highest unconfined compressive strength.

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Section: Parametric Influences On Mechanical Propertiessupporting

confidence: 85%

Mechanical Properties of Geopolymers Synthesized from Fly Ash and Red Mud under Ambient Conditions

Koshy

Dondrob

et al. 2019

Crystals

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“…Nevertheless, hardening at elevated temperatures (above 100˚C) promotes the appearance of cracks and can negatively affect the properties of the geopolymer binder [9]. Metakaolin and rice husk ash were used as the main source of aluminosilicate material for the synthesis of geopolymer as in previous studies [10] [11]. In the present study, two alkaline solutions (NaOH/KOH) were additionally used as activator to investigate the influence of their nature on the properties of geopolymer binders.…”

Section: Introductionmentioning

confidence: 97%

Comparative Study on Geopolymer Binders Based on Two Alkaline Solutions (NaOH and KOH)

Sore¹,

Messan²,

Prud’Homme³

et al. 2020

JMMCE

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This study specifically investigated the influence of the composition of aluminosilicate material i.e. the substitution of metakaolin by rice husk ash and the nature of alkaline activators (Na + /K +) on mineralogical, structural, physical and mechanical properties of geopolymer binders. This influence was evaluated based on X-ray diffraction (XRD), Fourier Transform InfraRed spectroscopy (FTIR) and Scanning Electron Microscope (SEM analyses, apparent density, water accessible porosity, compressive strength and thermal properties. Two types of geopolymer binder were synthesized according to the type of alkali activator used, the NaOH-based geopolymer and the KOH-based geopolymer. The results of characterization performed after 14 days of curing of geopolymer samples showed that the activation of the aluminosilicate powder using alkaline solution led to change in their microstructure. The highest compressive strength was obtained with the NaOH-based geopolymer.

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“…The kaolin clay used in this work was extracted from the quarry of SAABA located in the suburbs of Ouagadougou the capital at coordinates N 12˚22.772', W 001˚24.634', and at an average altitude of around 317 m. This material has been used in previous research about synthesis of geopolymer binders based on local materials from Burkina Faso [23]. The heat treatment applied was for a three hours' period at 700˚C at a 10˚C/min rate.…”

Section: Kaolin and Metakaolin From Saabamentioning

confidence: 99%

“…After a 24 hours' period, the mortars were demolded and immediately placed into water in the laboratory conditions at 20˚C and 60 RH till test days (2, 7, 28, 56 days). The mortars prepared for durability testing were cast into the cylindrical molds of 50 Open Journal of Civil Engineering The grain size distribution of metakaolin and cement used in the study [23].…”

Section: Sample Preparation and MIX Designmentioning

confidence: 99%

The Influence of Metakaolin from Saaba (Burkina Faso) over Physico-Mechanical and Durability Properties of Mortars

Ntimugura¹,

Sore²,

Bello³

et al. 2017

OJCE

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The paper evaluates the feasibility of reducing clinker in the Portland Cement production using local metakaolin in Burkina Faso. Standardized testing methods have been used for this purpose, and experiments were performed on mortar prisms containing different amounts of metakaolin. Important results about the physical, mechanical and durability characterization of blended mortars were carried out in this study. The obtained results are discussed based on available literature data. These results have shown increased physical and durability properties for blended mortars. Although the mechanical strengths remained relatively low for higher MK incorporations, the latter grow to surpass these of PC mortars (the reference) at 28, 56 and 90 days of curing. The results in the paper, have confirmed the possibility of using metakaolin to partially substitute cement, a possibility to reduce the CO2 production by the cement industry in Burkina Faso.

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Synthesis and characterization of geopolymer binders based on local materials from Burkina Faso – Metakaolin and rice husk ash

Cited by 81 publications

References 36 publications

Mechanical Properties of Geopolymers Synthesized from Fly Ash and Red Mud under Ambient Conditions

Mechanical Properties of Geopolymers Synthesized from Fly Ash and Red Mud under Ambient Conditions

Comparative Study on Geopolymer Binders Based on Two Alkaline Solutions (NaOH and KOH)

The Influence of Metakaolin from Saaba (Burkina Faso) over Physico-Mechanical and Durability Properties of Mortars

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