Technological and Environmental Behavior of Coal Fly Ash in Lime-Based Materials

Sall, Mamoudou; Dieye, Gora; Traoré, Alassane; Gueye, Prince Momar; Diouf, S.; Wade, Abdou Ciss; Diop, Djibril

doi:10.4236/gm.2022.122002

Cited by 4 publications

(5 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A portable X-ray fluorescence (P-XRF) device Niton XLT900s was used to analyze the chemical composition of the ashes in terms of major and minor elements with a measurement time of 350 s. XRF was performed with 100% norma-lization and full fundamental parameter quantification techniques [23] [24] [25] [26]. The mineralogical characterization of ashes and mixtures lime-ash-water was carried out by X-ray powder diffraction (XRD) using a PW1840 diffractometer with Cu Kα radiation operating at 30 mA and 40 kV.…”

Section: Methodsmentioning

confidence: 99%

“…The analysis was done in the continuous scanning mode with a speed of 0.05˚ per s within the range of 10˚ ≤ 2θ ≤ 70˚ and acquisition time of 1560 s. The diffractometer is linked to a computer equipped with APD software. For data processing we used X Pert High Score software [22] [25] [26]. The Fourier transform infrared FTIR measurements were carried out by spectrometer Perkin Elmer FTIR System Spectrum X in the range 400 -4000 cm −1 .…”

Section: Methodsmentioning

confidence: 99%

“…Diffractograms of FSSA (Figure 2) and CFA (Figure 3) show the existence of a complex polyphasic material composed of several crystalline phases and a glass phase [1] [14] [25] [26].…”

Section: Mineralogical Characterizationmentioning

confidence: 99%

See 2 more Smart Citations

Comparative Characteristics of Hydrated Lime with Fine Sewage Sludge Ash (FSSA) and Coal Fly Ash (CFA)

Sall¹,

Wade²,

Dieye³

et al. 2022

JMMCE

Self Cite

View full text Add to dashboard Cite

The disposal of waste has become an environmental issue due to the limited available landfilling space. This paper aims to compare the characteristics of hydrated lime with fine sewage sludge ash (FSSA) and coal fly ash (CFA). Multiple techniques, X-ray fluorescence (XRF), X-ray diffraction (XRD), the Fourier transform infrared (FTIR), compressive strengths, thermophysical properties, and setting time were used to assess the physicochemical characteristics of the lime-based materials. X-ray fluorescence and X-ray diffraction were used to determine the chemical composition and phases of ashes, lime and binders. The results showed that the chemical composition of ashes is similar to that of cement. Besides glass, the main minerals identified in CFA and FSSA are quartz (SiO 2 ) and anhydrite (CaSO 4 ). Moreover, calcium aluminium oxide (Ca 3 Al 2 O 6 ) was detected for CFA and phosphorus calcium silicate (Ca 2 SiO 4 -Ca 3 (PO 4 ) 2 ) for FSSA and minor phases were detected for both. FTIR measurements were carried out to characterize the inorganics components of different samples. Compressive strengths of mortars with different formulations have shown that both have a long-term positive effect which might be related to a pozzolanic activity. For the CFA the L 3 binder consisting of 60% of coal fly ash and 40% lime has a higher compressive strength than the others while for the FSSA the L 4 binder consisting of 80% fine ash and 20% lime has a higher compressive strength than the others. Both binders setting start times are greater than that of cement but shorter than that of lime. The study of the thermophysical properties of binders shows that they have a higher thermal resistance than cement mortar. Moreover, binders heat up less quickly because of their low effusivity compared to cement. Lime-based ma-

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Comparative Characteristics of Hydrated Lime with Fine Sewage Sludge Ash (FSSA) and Coal Fly Ash (CFA)

Sall¹,

Wade²,

Dieye³

et al. 2022

JMMCE

Self Cite

View full text Add to dashboard Cite

show abstract

“…During slaking, some active CaO in lime soil is hydrated to produce Ca(OH) 2 . The reaction formula is as follows (1). The increase in Ca(OH) 2 content during lime soil slaking increases the pH value.…”

Section: Micro Mechanism Analysismentioning

confidence: 99%

“…Lime and soil are mixed to form lime soil, which has the characteristics of high strength, good integrity, economic material and convenient construction [1,2]. As a repair material, lime is widely used to improve the mechanical properties of rammed soils in the restoration of ancient rammed earth projects [3][4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Cracking and Mechanical Properties of Lime Soil with Different Slaking Conditions of Newly Repaired Earthen City Walls

Yue

Song

et al. 2022

Materials

View full text Add to dashboard Cite

In this paper, a method to control the lime reaction by different slaking conditions is proposed to reduce the occurrence of cracks in newly repaired earthen city walls. The effects and mechanisms of the slaking time (0 h, 12 h, 24 h, 48 h and 72 h), lime content (10%, 15% and 20%), and moisture content (14%, 18% and 22%) on the cracking and mechanical properties of lime soil were analyzed by the test results of surface cracks, triaxial compression, particle gradation, pH value, X-ray diffraction and scanning electron microscope. The results show that proper slaking of lime soil specimens can reduce surface cracks and improve mechanical properties. After 12 h of appropriate slaking, the crack rate of the lime soil with 20% content decreased by 97.13%, the cohesion increased by 20.27%, and the internal friction angle decreased by 11.27%. However, the mechanical properties decreased when the slaking time was too long. After 72 h of slaking, the cohesion of 20% lime soil decreased by 8.21% and the internal friction angle increased by 2.82%. Further analysis shows that the appropriate slaking conditions can regulate the reaction rate and alkali environment, control the lime produced cementitious substances, improve the particle gradation and further reduce the occurrence of surface cracks. These results provide a basis for the restoration technology of newly repaired earthen city walls.

show abstract

Synthesis of Inorganic Polymeric Materials from Industrial Solid Waste

Das

Rout²

2022

Silicon

View full text Add to dashboard Cite

Technological and Environmental Behavior of Coal Fly Ash in Lime-Based Materials

Cited by 4 publications

References 23 publications

Comparative Characteristics of Hydrated Lime with Fine Sewage Sludge Ash (FSSA) and Coal Fly Ash (CFA)

Comparative Characteristics of Hydrated Lime with Fine Sewage Sludge Ash (FSSA) and Coal Fly Ash (CFA)

Experimental Study on the Cracking and Mechanical Properties of Lime Soil with Different Slaking Conditions of Newly Repaired Earthen City Walls

Synthesis of Inorganic Polymeric Materials from Industrial Solid Waste

Contact Info

Product

Resources

About