Abstract
This study explored the potential of GGBS and SAC to enhance the thermal resistance of cement. The research explores changes in compressive strength and pore structure at various temperatures, employing microscopic analysis to elucidate underlying mechanisms. The results indicated that an optimal GGBS content enhanced strength, whereas SAC significantly reduced strength. The strength variation was not correlated with porosity or pore size distribution but rather with the hydration products of the blended cement. GGBS promoted the generation of C-A-S-H gels by introducing Al to replace Si in C-S-H gels, thereby increasing both the quality and quantity of gels. This enhancement suggested that GGBS improved thermal resistance by augmenting hydrate formation. SAC promoted ettringite formation even at high temperatures but reduced the quantity of hydrate gels, illustrating that SAC did not provide Al for the generation of C-A-S-H gels, consequently diminishing strength.
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