Preparation and Performance Study of Carboaluminate Artificial Aggregate Concrete Modified by GGBS

doi:10.16552/j.cnki.issn1001-1625.2025.0573

Abstract

Abstract: In response to the challenges posed by scarcity of natural aggregates (NA) and the accumulation of solid waste for sustainable development, this study proposed a design method for solid waste carboaluminate artificial aggregates modified by ground granulated blast furnace slag (GGBS) based on phosphogypsum (PG)-limestone powder (LP)- mayenite (C₁₂A₇) synergistic system. The method was developed through thermal gravimetric analysis, scanning electron microscopy-energy dispersive spectroscopy, and nanoindentation tests. The results show that the main hydration products of aggregates are ettringite(AFt), monocarboaluminate(Mc), aluminum hydroxide (AH₃) and calcium aluminosilicate hydrate (C-A-S-H) gel. The introduction of GGBS increases the reaction degree of calcium carbonate in LP, increases the amount of C-A-S-H gel formation, and enhances the strength of aggregates. When 15% (mass fraction) GGBS is added to aggregates(SL-C), the 28 d compressive strength of artificial aggregate concrete is 51.68 MPa, reaching 71.9% of the compressive strength of natural aggregate concrete (NAC) (71.87 MPa). Micro-mechanical and chemical composition analyses further indicate that there is a significant enrichment chemical component effect in interfacial transition zone (ITZ). The enrichment of Ca and Si elements in the ITZ of SL-C samples promotes the formation of calcium silicate hydrate (C-S-H) gel. An appropriate Si/Al molar ratio (1.0~3.0) is conducive to the formation of a dense sodium aluminumsilicate hydrate (N-A-S-H) gel, ensuring the generation of AFt and single sulfur aluminates (AFm), and enhancing the mechanical properties of ITZ.

Key words: ground granulated blast furnace slag, carboaluminate, artificial aggregate, interface transition zone, nanoindentation

CLC Number:

TU528.041

ZHANG Linxiaohan, WANG Yanshuai, PENG Rongxin, DONG Biqin. Preparation and Performance Study of Carboaluminate Artificial Aggregate Concrete Modified by GGBS[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(11): 4132-4146.

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