Influence of Accelerators on Cement Mortars Using Fluid Catalytic Cracking Catalyst Residue (FCC): Enhanced Mechanical Properties at Early Curing Ages

Supplementary cementitious materials (SCMs) have been used in the construction industry to mainly reduce the greenhouse gas emissions associated with Portland cement. Of SCMs, the petrochemical industry waste known as fluid catalytic cracking catalyst residue (FCC) is recognized for its high reactiv...

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Published inMaterials Vol. 17; no. 5; p. 1219
Main Authors Soriano, Lourdes, Borrachero, María Victoria, Giménez-Carbo, Ester, Tashima, Mauro M, Monzó, José María, Payá, Jordi
Format Journal Article
LanguageEnglish
Published Switzerland MDPI AG 01.03.2024
MDPI
Subjects
accelerator
Accelerators
Additives
Age
Air pollution
Air quality management
Catalysts
Catalytic cracking
Cement
Compressive strength
Construction industry
Curing
Emissions
Fluid catalytic cracking
Greenhouse gases
Hydration
Industrial wastes
Mechanical properties
Medical research
Medicine, Experimental
Mortars (material)
Nitrates
Portland cements
pozzolan
Reinforced concrete
Residues
Sodium silicates
thermogravimetry
Spain
compressive strength
pozzolan
thermogravimetry
accelerator
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Summary:Supplementary cementitious materials (SCMs) have been used in the construction industry to mainly reduce the greenhouse gas emissions associated with Portland cement. Of SCMs, the petrochemical industry waste known as fluid catalytic cracking catalyst residue (FCC) is recognized for its high reactivity. Nevertheless, the binders produced using SCMs usually present low mechanical strength at early curing ages. This study aims to assess the effect of different accelerating additives (KOH, sodium silicate SIL, commercial additive SKR) on the mechanical strength of mortars containing FCC. The results show that after only 8 curing hours, the compressive strength gain of the FCC mortars containing SKR was over 100% compared to the FCC mortar with no additive (26.0 vs. 12.8 MPa). Comparing the compressive strength of FCC mortar containing SKR to the control mortar, the enhancement is spetacular (6.85 vs. 26.03 MPa). The effectiveness of the tested accelerators at 8-24 curing hours was KOH ≈ SIL < SKR, whereas it was KOH < SIL < SKR for 48 h-28 days. The thermogravimetric data confirmed the good compatibility of FCC and the commercial accelerator.
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ISSN:1996-1944
1996-1944
DOI:10.3390/ma17051219