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

Ntimugura, Fabrice; Sore, Seick Omar; Bello, Latifou; Messan, Adamah

doi:10.4236/ojce.2017.73027

Cited by 6 publications

(7 citation statements)

References 22 publications

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“…From the filtrate, the remaining unreacted portlandite was extracted with saccharose and titrated by a 0.1 N hydrochloric acid solution according to equation (Eq. 1) 18 , 19 , each value considered being the average of three test results made under the same conditions. On the other hand, the precipitated products of reactions with K, Kc, K 10 and Kc 10 , denoted as K′, Kc′, K 10 ′ and Kc 10 ′ respectively, were analyzed by XRD to identify constitutive phases.…”

Section: Methodsmentioning

confidence: 99%

Pozzolanic activity of kaolins containing aluminum hydroxide

Leussa

Libessart

Djelal

et al. 2020

Sci Rep

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The addition of 10 wt% aluminum hydroxide to two crude kaolinitic clays, a commercial and a natural freshly mined one, has enhanced their pozzolanic activity, more substantially in the natural sample containing gibbsite. The obtained blends were used as replacement of 20 wt% of Portland cement in the formulations of pastes and mortars which exhibited significant decrease of setting time and increase of compressive strength from early age to 28 days. Also, SEM/EDX analyses showed very heterogeneous structures with hydrated phases identified from XRD. Specific interpretation of the role played by aluminum hydroxide revealed its aptitude to promote the formation of metastable hydrated phases (CAH 10 /C 2 AH 8 ) at early age, which temporally inhibited the hydration of cement. This progressive transformation led to the formation of more stable hydrated phases such as C–A–S–H which favored the increase of mechanical strength of the specimens. The sequence of transformation reactions is fully obtained with limited aluminum hydroxide content in clays. Either added as synthetic or naturally occurring in clays, aluminum hydroxide has close role in the strengthening process of cement. Hence, kaolinitic clays that naturally contain gibbsite are suggested as suitable supplementary cementitious material for partial replacement of cement.

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Section: Methodsmentioning

confidence: 99%

Pozzolanic activity of kaolins containing aluminum hydroxide

Leussa

Libessart

Djelal

et al. 2020

Sci Rep

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“…The geotechnical properties of clay materials before calcination are listed in Table 3. These results indicate that the first three clay materials (A1, A2, A3) have the highest plasticity indexes (17)(18)(19)(20)(21)(22), while the clay material A4 has the lowest plasticity index (8). Thus, the first three materials may have a higher content of clay minerals, while the last material has a lower plasticity index and thus possibly lower content of clay minerals [11,33].…”

Section: Geotechnical and Physical Properties Of Claysmentioning

confidence: 98%

“…Numerous studies have shown that industrial by-products, such as silica fume, fly ash, rice husk ash or simply natural materials, such as tuff, granite dust and limestone Sustainability 2022, 14, 2308 2 of 21 fillers, among others, meet the specific criteria of reactivity and/or filler [5][6][7][8][9]. These byproducts can therefore be used as partial substitutes for clinker or supplementary cementing materials.…”

Section: Introductionmentioning

confidence: 99%

“…These byproducts can therefore be used as partial substitutes for clinker or supplementary cementing materials. One of the solutions for reducing CO 2 emissions in cement manufacturing is to use metakaolin, which is generally a calcined clay [8]. Many authors have evaluated the usage of calcined clays as partial substitutes or supplementary cementing materials.…”

Section: Introductionmentioning

confidence: 99%

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Microstructural Analysis of the Reactivity Parameters of Calcined Clays

et al. 2022

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Four (04) different types of clays from Burkina Faso were studied for their potential applications in the production of calcined clays as substitution materials for Portland cement. The study aimed at analyzing the factors affecting their reactivity. The untreated clays were subjected to various tests to highlight the intrinsic properties that can influence their reactivity. After the treatment by calcination, the clays were subjected to various pozzolanicity tests and microstructural analysis in order to evaluate their influence on the microstructure of the cement paste. The results showed that the reactivity of calcined clays is strongly related to the intrinsic properties of the raw clays, such as the content and the structure of kaolinite: disordered kaolinite reacts better than ordered kaolinite. After the calcination, the reactivity depends on the amorphous phase (amorphous content) of the clays, which influences the strength activity index. This study established a correlation between different parameters to easily identify the main properties of calcined clays that can influence their pozzolanic reactivity. All the results showed that the kaolinite content is a determining factor in the reactivity of clays before calcination. However, the study showed that the amorphous content of kaolinite is the determining parameter of the reactivity of calcined clays, as calcination can lead to the recrystallization of kaolinite.

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“…In Burkina Faso, clay materials are already the subject of scientific work for their valorization [7,8,9] in construction. However, there is little literature on the use of Tuff in the cement industry, except in Algeria, where more than 50% of the cement plants that use calcareous Tuffs as pozzolans in the manufacture of cement are found [10].…”

Section: Introductionmentioning

confidence: 99%

Physical Mechanical Properties and Durability of Mortars Containing Tuff from Burkina Faso as Partial Substitution of CEM I

Kabre¹,

Savadogo²,

Lawane³

et al. 2018

AJCEA

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This paper presents the feasibility of using locally available limestone Tuff in Burkina Faso as a partial replacement for CEM I artificial Portland cement. To this end, standard tests were carried out in the laboratory on mortars containing variable proportions of Tuff in partial substitution of CEM I cement. These include heat of hydration, setting time, total shrinkage, compressive strength, capillary absorption and resistance to acid attack. The experimental results obtained show that Tuff can be used as a natural pozzolan. It is also noted that the incorporation of Tuff into cement has virtually no influence on the transfer properties of mortars. However, at a rate above 15% partial substitution of CEM I, the mechanical strength of mortars is considerably reduced. This is probably linked to the finesse of the Tuff used. A finer shredding improved the mechanical activity index. However, we note a better resistance to acid attack (sulphuric acid that can come from acid rain) of mortars containing Tuff compared to mortar based on artificial Portland cement. All these results have shown that the Tuff used in this work can be a solution for reducing CO 2 emissions in cement production and also in reducing the price of cement in Burkina Faso.

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

Cited by 6 publications

References 22 publications

Pozzolanic activity of kaolins containing aluminum hydroxide

Pozzolanic activity of kaolins containing aluminum hydroxide

Microstructural Analysis of the Reactivity Parameters of Calcined Clays

Physical Mechanical Properties and Durability of Mortars Containing Tuff from Burkina Faso as Partial Substitution of CEM I

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