In this study, a non-contact electrical resistivity method is employed to investigate the hydration process of calcium aluminate cement (CAC) pastes incorporating silica fume (SF) at an early age. The CAC-SF pastes have a water-to-binder ratio (w/b) of 0.6 and a replacement of SF for CAC at 0, 5, 10, and 20% (by weight of the binder). The pastes are tested for electrical resistivity, thermal analysis (internal temperature), setting time, and compressive strength, and the hydration products of the pastes are also examined. The results indicate that the evolution of electrical resistivity is closely related to the hydration process of the CAC pastes, and the conversion stage is closely associated with the setting time of pastes. As the increase of SF replacement, the hydration process of CAC pastes was accelerated within 24 h, and the development of compressive strength was hampered at an early age but increased later. SF replacement inhibits the conversion of metastable CAC hydrates (CAH10 and C2AH8) to C3AH6 through filling, seeding, and reacting with CAC, thus reducing the heat of hydration. 

A study on the hydration of calcium aluminate cement pastes containing silica fume using non-contact electrical resistivity measurement

Enhanced corrosion resistance through the introduction of fine pores: Role of nano-sized intracrystalline pores

Improving the anti-oxidation and water wettability of graphite through the design of coating structure for the preparation of Al2O3–SiC–C castables

Research on the co-pyrolysis of coal gangue and coffee industry residue based on machine language: Interaction, kinetics, and thermodynamics

Sulfate erosion is one of the main durability issue of ordinary Portland cement (OPC) while used in a sulfate-rich environment. Two aluminate phases in OPC, tricalcium aluminate (C3A) and tetracalcium aluminoferrite (C4AF), are primarily responsible for sulfate attack but with different sulfate resistant performance. This paper therefore focuses on the internal sulfate invasion to hydration products of these two aluminate minerals and attempts to explain the role of irons in hydrates. Chemical shrinkage coupled with X-ray diffraction (XRD), scanning electron microscope (SEM), and energy-dispersive X-ray spectra (EDS) are employed to determine the overall development of internal sulfate erosion of these hydrates. The results suggested that the doped iron in hydrogarnet (C3(A,F)H6) dramatically changes crystal growth and leads to large size of polyhedral particle to tiny cubic grain of C3AH6, which contributes superior performance to sulfate erosion. As to another hydrate monosulfate, the introduction of Fe...

Enhanced Sulfate Resistance: The Importance of Iron in Aluminate Hydrates

Conversion of calcium aluminate cement hydrates at 60°C with and without water

Trace nanoscale Al2O3 in Al2O3-MgAl2O4 castable for improved thermal shock performance

Effect of curing temperature on volume stability of CAC-bonded alumina-based castables

Comparison of interactions of MgO-based refractories with Li-ion battery cathode materials during calcination

Andalusite transformation and properties of andalusite-bearing refractories fired in different atmospheres

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