BAENLA Jean

Scopus Publications

Acid and Alkaline Activations of Raw Laterites Cured at Ambient Temperature: A Comparative Study
Monique Michèle Ngo Bitty, Jean Baenla, Vivien Igor Banzouzi Samba, Jean Jacques Madiba Mboka, Marchand Joseph Manga Dika, Antoine Elimbi
Silicon, 2025
Physical, mechanical and microstructural properties of alkaline and acid-activated mixtures of calcined laterite-volcanic ash based inorganic polymers: Effects of reciprocal substitution
Solomon T Ndisho, Ngaba Taybe, Jean Baenla, Philippe Douwe, Antoine Elimbi
Advances in Applied Ceramics, 2025
This study determines certain characteristics of inorganic aluminosilicate polymers synthesized by alkaline and acid activations of three calcined laterites and powder of volcanic ash obtained by reciprocal progressive partial replacements, in order to compare their characteristics as earthen building materials. Firstly, the calcined laterites were partially replaced with volcanic ash before activation in the ideal alkaline and acid solutions to obtain inorganic polymer composites. Secondly, reverse replacements and activations were achieved. The results have shown that both the reactive phase content in the aluminosilicates along with the presence of certain oxides (Fe 2 O 3 and Al 2 O 3 ) are the main parameters that influence the optimization of the characteristics of the obtained composites. Hence, the partial replacement of calcined laterites by volcanic ash is detrimental to the properties of the obtained products. Compressive strength reduces averagely by 57.6% and 36.7%, respectively for alkaline and acid-activated inorganic aluminosilicate polymers obtained by substituting calcined laterites with up to 50% volcanic ash. Conversely, partial replacement of volcanic ash with calcined laterites leads to 28 days compressive strength increase from 2.0 to 12.2 MPa (alkaline medium) and from 12.5 to 23.9 MPa (acidic medium). To get the best earthen building materials, activation of calcined laterite/volcanic ash mixtures is more effective in acidic medium than in alkaline one. Also, to obtain reliable products, only an aluminosilicate material with greater reactive phase content should be used as a substitute to partially replace the one with lesser reactive phase, not the reverse.
Effects of curing regimes on mechanical strength and durability of alkali-activated low reactive volcanic ashes
J. Baenla, I.B. Djon Li Ndjock, B.D. Missota Priso, P.D. Belibi Belibi, J.B. Bike Mbah, A. Elimbi
Materials Chemistry and Physics, 2024
Alkaline and Acid Activations of Calcined Laterites: A Comparative Study
Solomon Ndisho Tantono, Placide Desire Belibi Belibi, Jean Baenla, Antoine Elimbi
Silicon, 2023
Effects of Kinetic Parameters on Initial Setting Time, Microstructure and Mechanical Strength of Volcanic Ash-based Phosphate Inorganic Polymers
Bernard Missota Priso Dickson, Joseph Dika Manga, Thierry Ebenizer Pougnong, Jean Baenla, Louise Ndongo Ebongue, Antoine Elimbi
Silicon, 2022
Effects of Non-thermal Plasma Treatment on the Geopolymerization of Kaolin Clay
B. Sop-Tamo, L. N. Tchadjié, J. B. Tarkwa, Thamer Alomayri, Hasan Assaedi, J. P. Kamseu Mogo, J. Baenla, G. Kamgang-Youbi
Silicon, 2022
Effects of Al and Fe powders on the formation of foamed cement obtained by phosphoric acid activation of volcanic ash
B.I. Djon Li Ndjock, J. Baenla, E. Yanne, J.B. Bike Mbah, Souaïbou, A. Elimbi
Materials Letters, 2022
Effects of chemical composition of amorphous phase on the reactivity of phosphoric acid activation of volcanic ashes
Thierry Ebenizer Pougnong, Placide Desiré Belibi Belibi, Jean Baenla, Alomayri Thamer, Emmanuel Tiffo, Antoine Elimbi
Journal of Non Crystalline Solids, 2022
Effect of various amounts of aluminium oxy‐hydroxide coupled with thermal treatment on the performance of alkali‐activated metakaolin and volcanic scoria
Emmanuel Tiffo, Placide Désiré Belibi Belibi, Jean Batiste Bike Mbah, Alomayri Thamer, Thierry Ebenizer Pougnong, Jean Baenla, Antoine Elimbi
Scientific African, 2021
This study aims to improve the stability of alkali-activated products, such as powdered volcanic scoria and metakaolin, by thermal treatment in addition to their partial replacement with aluminium oxy-hydroxide. To this effect, mixtures obtained from a partial replacement of aluminosilicate sources (volcanic scoria or metakaolin) with respectively 0, 10, 20 or 30 % of mass of aluminium oxy-hydroxide were alkali-activated and stored for 28 days at room temperature in the laboratory. The various specimens obtained were heated at 900–1200 °C and both the alkali-aluminosilicates and the heated products were analysed. It appeared that aluminium oxy-hydroxide improves the stability of heated products. Thus, without replacement, alkali-activated specimens of metakaolin showed cracks at 1100 °C while those of volcanic scoria melted at 1150 °C. Conversely, heated alkali-activated specimens of either volcanic scoria or metakaolin with the replacement showed stability up to 1200 °C and an improvement in the residual compressive strength as from 900 °C. Indeed, at 1150 °C, the metakaolin-based geopolymers or the alkali-activated volcanic scoria with 30 % of mass of the replacement showed residual compressive strength of 76.7 and 35.0 MPa, respectively, due to the sintering and to the formation of new crystalline phases (mullite, corundum, carnegieite and nepheline). Yet, residual compressive strength in the alkali-activated aluminosilicate specimens with replacement that were heated at 1200 °C dropped as a result of the partial dissolution of nepheline and carnegieite which may have generated closed pores within their microstructure. Hence, alkali-activation of volcanic scoria or metakaolin partially replaced with aluminium oxy-hydroxide is a remarkable process to get thermally stable products.
Phosphoric acid activation of volcanic ashes: Influence of the molar ratio R = (MgO + CaO) / P2O5 on reactivity of volcanic ash and strength of obtained cementitious material
B.I. Djon Li Ndjock, R.A. Robayo-Salazar, R. Mejía de Gutiérrez, J. Baenla, J.A. Mbey, Martin Cyr, A. Elimbi
Journal of Building Engineering, 2021
Amorphous phase of volcanic ash and microstructure of cement product obtained from phosphoric acid activation
Benjamin Igor Djon Li Ndjock, Jean Baenla, Jean Baptiste Bike Mbah, Antoine Elimbi, Martin Cyr
SN Applied Sciences, 2020
Partial replacement of low reactive volcanic ash by cassava peel ash in the synthesis of volcanic ash based geopolymer
J. Baenla, J.B. Bike Mbah, I.B. Djon Li Ndjock, A. Elimbi
Construction and Building Materials, 2019

BAENLA Jean

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Scopus Publications