Evaluation of performances of volcanic-ash-laterite based blended geopolymer concretes: Mechanical properties and durability

Metekong, Jordan Valdès Sontia; Kaze, Cyriaque Rodrigue; Deutou, Juvenal Giogetti Nemaleu; Venyite, Paul; Nana, Achile; Kamseu, Elie; Melo, Uphie Chinje; Tatietsé, Thomas Tamo

doi:10.1016/j.jobe.2020.101935

Cited by 34 publications

(26 citation statements)

References 42 publications

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“…The displacement of the bands through the geopolymer reaction justi es the formation of the newly formed amorphous phase as previously reported by other studies where different aluminosilicate precursors are used [3,17,39]. The bands located at 864 cm − 1 , 867 cm − 1 , 868 cm − 1 and 909 cm − 1 in Fig.…”

Section: Ftir Spectrasupporting

confidence: 79%

“…Due to their local availability and large quantities, increasing interest was recently observed in the use of lateritic soils as precursors in the synthesis of geopolymers [2,16,17]. The main studies in this area indicated that, the characteristics of the end products are governed by the synthesis conditions and the starting material composition and pretreatment.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Thermal Activation and Silica Modulus on the Properties of Clayey-Lateritic Based Geopolymer Binders Cured at Room Temperature

Metekong

Kaze

Adesina

et al. 2022

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The growing demand and use of geopolymer binders have been of high interest in recent times due to their sustainability and economic bene ts. However, locally available materials must be used in the production of geopolymer binders in order to maximize their bene ts. In this study, a laterite soil which is a locally available material in many parts of the world was used as the aluminosilicate precursor. In order to produce the geopolymer binders, the laterite soil was activated thermally through calcination and the resulting calcined laterite was activated with an alkali activator composed of sodium hydroxide (NaOH) and sodium silicate (Na 2 SiO 3 ). The in uence of calcination temperature and the concentration of NaOH on the properties of the developed geopolymers was investigated. Calcination temperature used ranged between 550 °C to 750 °C and the NaOH concentrations used were 8 M and 10 M. The results from this study indicate that some locally available laterite soils can be utilized in the production of geopolymer binders if they undergo calcination. Increasing the calcination temperature from 550 °C to 750 °C resulted in the transformation of phases and an increase in the reactivity of the laterites, resulting in material with improved properties. The use of laterite calcined at 750 °C and activated with 8 M NaOH solution resulted to an increase in the 28 days compressive strength by 35.3 MPa compared to when laterite calcined at 550 °C was used. Increasing the concentration of the NaOH solution was also found to yield higher material performance. Microstructural investigations were also carried out to con rm the macrostructural properties.

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Section: Ftir Spectrasupporting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Influence of Thermal Activation and Silica Modulus on the Properties of Clayey-Lateritic Based Geopolymer Binders Cured at Room Temperature

Metekong

Kaze

Adesina

et al. 2022

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“…The porosity increased significantly after exposure to 400 • C and reached a maximum at 1000 • C, which could be directly attributed to increasing visible cracks [81]. Sontia Metekong et al [82] performed X-ray diffraction analysis on volcanic ash and calcined-laterite-based geopolymer concrete samples. In the study, volcanic ash and calcined laterite were applied as the aluminosilicate sources of the geopolymer concrete.…”

Section: Morphological and Chemical Properties Of Durable Geopolymer ...mentioning

confidence: 99%

“…Sontia Metekong et al [ 82 ] performed X-ray diffraction analysis on volcanic ash and calcined-laterite-based geopolymer concrete samples. In the study, volcanic ash and calcined laterite were applied as the aluminosilicate sources of the geopolymer concrete.…”

Section: Morphological and Chemical Properties Of Durable Geopolymer ...mentioning

confidence: 99%

“…In both GL20 and GL40 samples, the minerals of the volcanic ash inclusive of quartz, hematite, and anorthoclase could be traced from their high intensity peaks of X-ray diffraction. This could be justified by the fact that these mineral phases have been unaltered or partially dissolved in alkaline medium [ 82 ]. The unreacted minerals could function as filling agents that reinforced the geopolymer concrete, and this contributed to the concrete robustness.…”

Section: Morphological and Chemical Properties Of Durable Geopolymer ...mentioning

confidence: 99%

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Durability Performance of Geopolymer Concrete: A Review

Wong

2022

Polymers

107

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Geopolymer concrete is produced from the geopolymerization process, in which molecules known as oligomers integrate to form geopolymer networks with covalent bonding. Its production expends less thermal energy and results in a smaller carbon footprint compared to Ordinary Portland Cement (OPC) concrete. It requires only an alkaline activator to catalyze its aluminosilicate sources such as metakaolin and fly ash, to yield geopolymer binder for the geopolymerization to take place. Because of its eco-friendly technology and practical application, current research interest is mainly concentrated on the endurance of geopolymer concrete to resist heat and chemical aggressions. As such, it is pertinent for this review article to provide critical insight into the recent progress in research on the durability of geopolymer concrete. One significant outcome of the review is that the admixture of geopolymer concrete could be blended with additives such as micro-silica and fibers such as polypropylene fibers, to enhance its durability. The review on the durability aspects of geopolymer concrete showed that it had high compressive strength at an optimal elevated temperature, low to medium chloride ion penetrability, and high resistance to acid attack and abrasion. This makes geopolymer concrete a viable candidate to replace OPC concrete in the construction industry.

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Feasibility of production fired bricks based lateritic soil at very low temperature

Sontia Metekong,

Kaze,

Kamseu

et al. 2024

Int J Ceramic Engine & Sci

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The present project deals with the production of lateritic soil based bricks under different curing temperatures (28°C–150°C). A fraction of 10–30 wt% amount alkaline solution was added to improve the reactive phase content. The raw materials and hardened products were characterized using X‐ray diffraction (XRD), fourrier transform infrared spectroscopy (FTIR), mechanical properties and scanning electron microscope analysis. The results show that the addition of alkaline solution (30%) and the curing temperature (150°C) have a beneficial influence on physical properties (bulk density: 1.77 g/cm3, water absorption: 16.98%, and porosity: 30.13%) and mechanical performances (flexural: 6.61 MPa and compressive: 13.57 MPa). Compared with the code requirements for stabilized earth blocks, the compressive strength was higher than the minimum required. Microstructural investigations were also carried out to confirm the macrostructural properties. The above‐mentioned process appears to be a suitable candidate for engineering applications such as the stabilization of earth roads.

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Evaluation of performances of volcanic-ash-laterite based blended geopolymer concretes: Mechanical properties and durability

Cited by 34 publications

References 42 publications

Influence of Thermal Activation and Silica Modulus on the Properties of Clayey-Lateritic Based Geopolymer Binders Cured at Room Temperature

Influence of Thermal Activation and Silica Modulus on the Properties of Clayey-Lateritic Based Geopolymer Binders Cured at Room Temperature

Durability Performance of Geopolymer Concrete: A Review

Feasibility of production fired bricks based lateritic soil at very low temperature

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