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Evaluation of sulfate resistance of calcined dolomite activated ground granulated blast furnace slag

Gu, K and Jin, F and Al-Tabbaa, A and Shi, B and Tang, C (2016) Evaluation of sulfate resistance of calcined dolomite activated ground granulated blast furnace slag. Journal of Materials in Civil Engineering, 28. ISSN 0899-1561

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Aggressive environments significantly influence the durability and serviceability of hardened cement and concrete. This paper presents an evaluation of the resistance of ground-granulated blast-furnace slag (GGBS) activated with calcined dolomite, as a novel alkali activator, to 5% sodium sulfate attack and 5% magnesium sulfate attack. Two calcined dolomites, D800 and D1000, were prepared in the laboratory at 800°C and 1,000°C, respectively. The results demonstrated the good potential of using calcined dolomite activated slag in resisting sulfate attack. Immersion in Na SO (aqueous) led to an increase in strength in both the D800 (D800S) and the portland cement CEM I 52.5 N (PCS) activated slag with a more pronounced effect in the former and a decrease in the D1000 (D1000S) activated slag. Conversely, calcined dolomite activated slag had less strength loss than PCS after MgSO attack. The products of sulfate attack and the deterioration processes are also analyzed by a range of tests, including pH, weight change, corroded depth, X-ray diffraction (XRD), thermogravimetric analysis (TGA), and scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). After Na SO attack, the main product on D800S and D1000S was gypsum with a larger amount in the latter. Gypsum, thaumasite, and M-S-H were the main products of D800S and D1000S after MgSO attack. The better resistance of D800S to sulfate attack was attributed to the absence of portlandite in the hydrated paste. Conversely, the presence of portlandite in D1000S led to the inhomogeneous sulfate ions inward progression; hence, the severe deterioration of the sample was observed. 2 4 4 2 4 4

Item Type: Article
Divisions: Div D > Geotechnical and Environmental
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:40
Last Modified: 22 Apr 2021 06:16
DOI: 10.1061/(ASCE)MT.1943-5533.0001392