Properties and Microstructure of Steel Slag Powder-Fly Ash Based Geopolymer

Abstract

Abstract: Steel slag powder and fly ash were used as the main raw materials to prepare geopolymers. The compressive strength was used as the index to optimize the preparation conditions. The factors affecting strength of the geopolymers were discussed. The phase composition, microstructure and thermostability of the products were characterized by SEM, XRD and TG-DSC. The results show that the compressive strength of geopolymer increases first and then decreases with the increase of the content of steel slag powder and activator, and increases with the increase of curing temperature, among which curing temperature is the most significant factor, and modulus of sodium silicate is the weakest. The optimum process conditions are as follows: sodium silicate modulus 1.0, sodium silicate content 20% (mass fraction), steel slag powder content 20% (mass fraction), liquid-solid ratio 0.3, curing temperature 60 ℃. The 3 d and 7 d compressive strength of geopolymers are as high as 40.11 MPa and 43.03 MPa. Solidified Pb²⁺ has little effect on its strength and the solidified effect is more than 99.99%. Geopolymer has high surface density, excellent thermal stability, and no obvious crack and obvious steel slag particle profile is not observed. Its crystal phase is mainly quartz and mullite.

Key words: steel slag, fly ash, geopolymer, compressive strength, microstructure, solidified Pb²⁺

CLC Number:

TQ172

ZHANG Xiling, GUO Haifeng, TANG Ziqi, HE Zhiwei, SONG Liting, YU Mengqin. Properties and Microstructure of Steel Slag Powder-Fly Ash Based Geopolymer[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(12): 4044-4051.

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