Comparison of the microstructure and the compressive strength of two geopolymers derived from Metakaolin and an industrial sludge

Belmokhtar, Noureddine; Ammari, Mohammed; Brigui, Jamal; Allal, Laïla Ben

doi:10.1016/j.conbuildmat.2017.04.127

Cited by 59 publications

(34 citation statements)

References 38 publications

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“…The disappearance of the absorption bands of Al VI OH at 910 and 696 cm −1 are due to dehydroxylation phenomenon, and the intensity decrease of characteristic vibration bond of the Si O at about 536 cm −1 simultaneously with its displacement to a higher frequency (about 549 cm −1 ) are due to the deformation of the tetrahedral and octahedral sheets of the kaolinite network present in KT. These results are in agreement with those obtained by Belmokhtar et al [35]. All these changes happening on the kaolinite network make them more disordered, which is manifested in the X-ray pattern by the disappearance of the kaolinite peaks.…”

Section: Ftir Characterizationsupporting

confidence: 93%

“…These two oxides are of fundamental ingredients during the geopolymerization. The report SiO 2 /Al 2 O 3 is higher than 1.17 (case of kaolinites), this gap would suggest the presence of silica free (quartz) in the kaolin used [35]. This is in agreement with results obtained by XRD analysis.…”

Section: Raw Materials Xrd and Fx Characterizationsupporting

confidence: 90%

“…These results are in agreement with those obtained by Belmokhtar et al . . All these changes happening on the kaolinite network make them more disordered, which is manifested in the X‐ray pattern by the disappearance of the kaolinite peaks.…”

Section: Resultsmentioning

confidence: 99%

“…After calcination, the characteristic peaks of kaolinite have disappeared as shown in the CKT spectrum. This disappearance can be explained by transformation of kaolinite phase present in KT to an amorphous phase metakaolinite which prove dehydroxylation of kaolinite [35,36].…”

Section: Raw Materials Xrd and Fx Characterizationmentioning

confidence: 99%

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Efficiency of stabilization/solidification of heavy metals contained in hydroxide sludge waste into metakaolin based geopolymers

Chaabane

Moussaceb

Aït‐Mokhtar

2018

Env Prog and Sustain Energy

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In this work, the S/S of heavy metals contained in hydroxide sludge waste was used into geopolymers. Metakaolin, sludge waste, hydroxide, and sodium silicate were mixed. Amount of waste added varied between 10% and 40% in the synthesis of geopolymers. Geopolymers were cured at 40°C for 24 h. After 7 and 28 days of aging, strength of the geopolymers specimen were studied. Mineralogical phases, morphology and FTIR analysis were used to characterize raw materials and geopolymers. TCLP test was used to determine amount of heavy metals released from S/S materials. Amount of heavy metals released are lower than quantities released from raw waste. Heavy metals were identified, by XRD analysis, within mineralogical phases. Results obtained shows that geopolymers can immobilize heavy metals and reduce their release to the environment. Mechanical strengths of all samples are higher than the lower required for the S/S processes. Best mechanical strength was of 9.29 and 10.02 MPa at 7 and 28 days, respectively. A decrease of mechanical strengths recorded is due to increasing amount of waste added that causes structural discontinuity within the gel during geopolymerization. © 2018 American Institute of Chemical Engineers Environ Prog, 38:e13137, 2019

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Section: Ftir Characterizationsupporting

confidence: 93%

Section: Raw Materials Xrd and Fx Characterizationsupporting

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Section: Raw Materials Xrd and Fx Characterizationmentioning

confidence: 99%

See 2 more Smart Citations

Efficiency of stabilization/solidification of heavy metals contained in hydroxide sludge waste into metakaolin based geopolymers

Chaabane

Moussaceb

Aït‐Mokhtar

2018

Env Prog and Sustain Energy

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“…The alkaline activated binding materials, also know as geopolymers or inorganic polymers can be produced by the polycondensation of the SiO 4 and AlO 4 groups present in aluminosilicate raw materials 4,5 . The alkali-activated materials (AAM) can be produced with a wide variety of starting materials rich in silicon and aluminum with short-range atomic ordering [6][7][8][9][10][11][12] . Theses amorphous or semi-crystalline compounds are solubilized in an alkaline environment and release monomers promoting the formation of a polymer chain by polycondensation reactions.…”

Section: Introductionmentioning

confidence: 99%

Effect of Curing Temperature, Activator Solution Composition and Particle Size in Brazilian Fly-Ash Based Geopolymer Production

et al. 2019

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The geopolymer binder is a relatively new class of inorganic binding material of elevated mechanical strength and good chemical properties. This can be produced using clay minerals or byproducts of the industrial processes, such as metakaolin, fly-ash and blast furnace slag. In this work, geopolymers were produced by alkaline activation of a Brazilian fly-ash with simple and compound solutions (NaOH and NaOH + Na 2 SiO 3). The hardened specimens presented values of the mechanical strength close to 48 MPa when the activator used presented SiO 2 /Na 2 O ration close to 1.0 after 24 h of curing at 65 °C. The increase of the temperature to 90 °C favored the reactions of the N-AS -H gel (geopolymer) formation and compression strength increased to values close to 90 MPa after 24 h. It has been found that physical properties, such as density and porosity, varied when different SiO 2 /Na 2 O rations was present in alkaline solutions. Time, temperature of curing and particle size of fly-ash modified the mechanical and physical proprieties of hardened inorganic binder. Was observed the diffraction phases related to zeolitic phases and carbonate new bands of absorption were related to reactions of Na2O in excess with atmospheric CO 2. The variation of SiO 2 /Na 2 O modified the microstructural of the hardened specimens.

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A New Approach for the Management of an Industrial Waste: A Case Study

Belmokhtar

Ayadi

Ammari

et al. 2020

Advances in Intelligent Systems and Computing

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Comparison of the microstructure and the compressive strength of two geopolymers derived from Metakaolin and an industrial sludge

Cited by 59 publications

References 38 publications

Efficiency of stabilization/solidification of heavy metals contained in hydroxide sludge waste into metakaolin based geopolymers

Efficiency of stabilization/solidification of heavy metals contained in hydroxide sludge waste into metakaolin based geopolymers

Effect of Curing Temperature, Activator Solution Composition and Particle Size in Brazilian Fly-Ash Based Geopolymer Production

A New Approach for the Management of an Industrial Waste: A Case Study

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