Strength Formation Mechanism of Alkali-Activation Steel Solid Waste Concrete

Abstract

Abstract: In order to comprehensively utilize steel solid waste, this paper used steel slag, blast furnace slag, iron tailings and natural crushed sand as raw materials, NaOH and Na₂SiO₃ as activators to prepare concrete. The effects of mass ratio of steel slag-to-blast furnace slag, iron tailings replacement rate, alkali dosage and alkali modulus on the working and mechanical properties of concrete were investigated. Based on microstructural analysis and pH test, the corresponding hydration mechanisms of alkali-activated steel solid waste concrete were revealed. The results show that the addition of iron tailings can improve the gradation of aggregates particles and enhance the overall compactness of concrete. The activators promote the dissolution of active minerals of steel slag and blast furnace slag, and speed up the hydration reaction process of concrete. The inclusion of steel slag can provide abundant Ca²⁺ for the formation of C-S-H gel, C-A-S-H gel and Ca(OH)₂ crystal. When the mass of steel slag-to-blast furnace slag is 1∶9, the iron tailing replacement rate is 45% (mass fraction), the alkali dosage is 6% (mass fraction) and the alkali modulus (molar ratio of SiO₂ and Na₂O) is 1.4, the 28 d compressive strength of alkali-activation steel solid waste concrete reaches 47.6 MPa.

Key words: alkali-activation, steel solid waste, concrete material, compressive strength, microstructure, hydration mechanism

CLC Number:

TU528

LIU Dekun, SUN Qi. Strength Formation Mechanism of Alkali-Activation Steel Solid Waste Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(3): 1057-1068.

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