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| Preparation of Ultra-High Performance Concrete with Steel Slag Mud |
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Received:December 25, 2022
Revised:December 27, 2022
Accepted:January 09, 2023
Published Online:April 20, 2023
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| DOI：doi：10.3969/j.issn.1007-7545.2023.05.014 |
| KeyWord:steel slag mud; ultra-high performance concrete; orthogonal test; ettringite; C—S—H gel |
| Author | Institution |
| YU Yang |
北京科技大学 |
| NI Wen |
北京科技大学 |
| MU Xin-li |
北京科技大学 |
| CHEN Zhi-yuan |
北京科技大学 |
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| Abstract: |
| The technology of mechanical activation and multi-solid waste synergistic reaction is adopted to make use of the cementing properties and fine aggregate properties of steel slag mud and cooperate with other industrial solid waste to prepare ultra-high performance concrete (UHPC), so as to realize the utilization of high dosage and high added value of steel slag mud. Effects of steel slag tailing mud content, mass ratio of slag to gypsum, water consumption, and curing temperature on compressive and flexural strength of ultra-high performance concrete were studied. The results show that the 28 d compressive strength of UHPC test block is 140 MPa above, and the flexural strength is 35 MPa under the conditions including steel slag mud content of 60%, mass ratio of blast furnace slag to desulfurization gypsum of 4, water consumption per cubic meter of 210 kg, curing temperature of 50 ℃, and the volume content of steel fiber of 5%. By means of X-ray diffraction (XRD), Fourier ? infrared spectroscopy (FT?IR) and TG?DSC testing methods, the hydration hardening characteristics of steel slag mud - blast furnace slag - desulfurization gypsum system have been studied. With the continuous development of the reaction, the amount of hydration products ettringite and C—S—H gel strength substance is increasing. |
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