Search Results - "Yankwa Djobo, Jean Noel"

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  1. 1

    Mechanical properties and durability of volcanic ash based geopolymer mortars by Yankwa Djobo, Jean Noël, Elimbi, Antoine, Kouamo Tchakouté, Hervé, Kumar, Sanjay

    Published in Construction & building materials (15-10-2016)
    “…•Volcanic ash based geopolymer mortars perform well under wet-dry cycles.•Samples cured at 27°C have better acid resistance than those cured at 80°C.•The…”
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    Journal Article
  2. 2

    Volcanic ash-based geopolymer cements/concretes: the current state of the art and perspectives by Djobo, Jean Noël Yankwa, Elimbi, Antoine, Tchakouté, Hervé Kouamo, Kumar, Sanjay

    “…The progress achieved with the use of volcanic ash for geopolymer synthesis has been critically reviewed in this paper. This consists of an overview of…”
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  3. 3

    The role of chemistry and fineness of metakaolin on the fresh properties and heat resistance of blended fly ash-based geopolymer by Abbass, Ahmed Mohamed, Firdous, Rafia, Yankwa Djobo, Jean Noel, Stephan, Dietmar, Elrahman, Mohamed Abd

    Published in SN applied sciences (01-05-2023)
    “…Sensible thermal energy storage using concrete as a storage medium is a promising technology that helps minimize energy in power plant. The purpose of this…”
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  4. 4

    The reaction of calcium during the formation of metakaolin phosphate geopolymer binder by Djobo, Jean Noël Yankwa, Stephan, Dietmar

    Published in Cement and concrete research (01-08-2022)
    “…This work reports the role of calcium during the acidic aluminum phosphate-activation of metakaolin (MK) and the characteristics of the resulting binder…”
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  5. 5

    Natural pozzolan based geopolymers: A review on mechanical, microstructural and durability characteristics by Firdous, Rafia, Stephan, Dietmar, Djobo, Jean Noël Yankwa

    Published in Construction & building materials (30-11-2018)
    “…•Use of natural pozzolans in development of geopolymers.•Properties of natural pozzolan based geopolymers.•Factors influencing the geopolymerization of natural…”
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  6. 6

    Lateritic soils based geopolymer materials: A review by Cyriaque Kaze, Rodrigue, Naghizadeh, Abdolhossein, Tchadjie, Leonel, Adesina, Adeyemi, Noel Yankwa Djobo, Jean, Deutou Nemaleu, Juvenal Giogetti, Kamseu, Elie, Chinje Melo, Uphie, Tayeh, Bassam A.

    Published in Construction & building materials (15-08-2022)
    “…[Display omitted] •Use of lateritic soils in the development of geopolymer products.•Advances in the mechanism of laterite based geopolymer were…”
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  7. 7

    Control of the setting reaction and strength development of slag-blended volcanic ash-based phosphate geopolymer with the addition of boric acid by Djobo, Jean Noël Yankwa, Stephan, Dietmar

    Published in Journal of the Australian Ceramic Society (01-09-2021)
    “…This work aimed to evaluate the role of the addition of blast furnace slag for the formation of reaction products and the strength development of volcanic…”
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  8. 8

    Preparation of acid aluminum phosphate solutions for metakaolin phosphate geopolymer binder by Yankwa Djobo, Jean Noël, Nkwaju, Rachel Yanou

    Published in RSC advances (30-09-2021)
    “…This work assessed the potential of synthetic acid aluminum phosphate solutions for the enhancement of the characteristics of metakaolin phosphate geopolymer…”
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  9. 9

    Setting and hardening behavior of volcanic ash phosphate cement by Djobo, Jean Noël Yankwa, Stephan, Dietmar, Elimbi, Antoine

    Published in Journal of Building Engineering (01-09-2020)
    “…This study aims at determining the setting and hardening behavior of volcanic ash-phosphate cement (VAPC) at room temperature using various concentrations of…”
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  10. 10

    Gel Composition and Strength Properties of Alkali-Activated Oyster Shell-Volcanic Ash: Effect of Synthesis Conditions by Djobo, Jean Noël Yankwa, Tchakouté, Hervé Kouamo, Ranjbar, Navid, Elimbi, Antoine, Tchadjié, Leonel Noumbissié, Njopwouo, Daniel

    Published in Journal of the American Ceramic Society (01-09-2016)
    “…The gel composition and mechanical properties of alkali‐activated oyster shell‐volcanic ash were investigated at different NaOH concentrations (8, 12, and 15M)…”
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  11. 11

    Microstructural characterization and mechanical properties of bottom ash mortar by Hashemi, Sajedeh Sadat Ghazizadeh, Mahmud, Hilmi Bin, Djobo, Jean Noël Yankwa, Tan, Chee Ghuan, Ang, Bee Chin, Ranjbar, Navid

    Published in Journal of cleaner production (01-01-2018)
    “…Coal Bottom Ash (CBA) is one of the widely-produced residues of coal incineration in thermal power plants. The annual extraction of such a huge amount of waste…”
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  12. 12

    Reactivity of volcanic ash in alkaline medium, microstructural and strength characteristics of resulting geopolymers under different synthesis conditions by Djobo, Jean Noël Yankwa, Elimbi, Antoine, Tchakouté, Hervé Kouamo, Kumar, Sanjay

    Published in Journal of materials science (01-11-2016)
    “…The present paper investigated the reactivity of volcanic ash in alkaline medium and reported the effect of synthesis conditions on microstructural and…”
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  13. 13

    Utilization of sodium waterglass from sugar cane bagasse ash as a new alternative hardener for producing metakaolin-based geopolymer cement by Tchakouté, Hervé Kouamo, Rüscher, Claus Henning, Hinsch, Malte, Djobo, Jean Noël Yankwa, Kamseu, Elie, Leonelli, Cristina

    Published in Chemie der Erde (01-05-2017)
    “…Sugar cane bagasse ash from SOSUCAM company in Cameroon was used to synthesize sodium waterglass as a new alternative hardener. The new hardener was used to…”
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  14. 14

    Physical and mechanical properties of unheated and heated kaolin based-geopolymers with partial replacement of aluminium hydroxide by Tiffo, Emmanuel, Bike Mbah, Jean Batiste, Belibi Belibi, Placide Désiré, Yankwa Djobo, Jean Noel, Elimbi, Antoine

    Published in Materials chemistry and physics (01-01-2020)
    “…Amorphous aluminium hydroxide and aluminium oxy-hydroxide were used as replacements in the synthesis of kaolin based-geopolymers. Physical and mechanical…”
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    A comparative study of two methods to produce geopolymer composites from volcanic scoria and the role of structural water contained in the volcanic scoria on its reactivity by Tchakouté, Hervé Kouamo, Kong, Sakeo, Djobo, Jean Noël Yankwa, Tchadjié, Leonel Noumbissié, Njopwouo, Daniel

    Published in Ceramics international (01-12-2015)
    “…Volcanic scoria (ZG, ZK) and kaolin (MY38) were applied for producing geopolymer mortars using two methods such as fusion and conventional methods. Kaolin was…”
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  17. 17

    Size fractionation of brown fly ash: utilisation of grey fraction as a pozzolanic material in blended cement by Kumar, Sujeet, Djobo, Jean Noël Yankwa, Kumar, Anil, Kumar, Sanjay

    “…The work aimed to classify a raw brown colour fly ash (RFA) into coarse grey fly ash (GFA) and fine brown fly ash (BFA) using a laboratory air classifier and…”
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    Early age properties and water resistance of calcium hydroxide modified volcanic ash‐based phosphate geopolymer binders by Djobo, Jean Noël Yankwa, Hirsch, Tamino, Stephan, Dietmar

    “…Abstract This work aims to improve the early age characteristics and water resistance of volcanic ash‐based phosphate geopolymer materials by modifying the…”
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  20. 20

    Effective Stabilization of Cadmium and Copper in Iron-Rich Laterite-Based Geopolymers and Influence on Physical Properties by Nkwaju, Rachel Yanou, Nouping, Joëlle Nadia Fekoua, Bachirou, Soumayah, Abo, Tatiane Marina, Deutou, Juvenal Giogetti Nemaleu, Djobo, Jean Noël Yankwa

    Published in Materials (12-12-2023)
    “…This study aimed to investigate the efficiency of a geopolymer binder of the type of Na-poly(ferro-silico-aluminate) as a matrix for the stabilization of heavy…”
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