Materials Reports  2021, Vol. 35 Issue (z2): 460-464 |
| METALS AND METAL MATRIX COMPOSITES |
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| Study on the Effect of Acidified Pseudo-boehmite Modified Nickel Steel Slag Composite Dopant |
| LI Chongzhi, SUN Hao, YE Guolin, ZHANG Yijie
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| School of Civil and Transportation Engineering, Beijing University of Civil and Architecture, Beijing 102600, China |
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Abstract To improve the activity of nickel steel slag, a series of modified nickel steel slag composite admixtures (Modified NSSCA) with different acidified pseudo-boehmite content were obtained by adding 0%-8% of pseudo-boehmite (acidified pseudo-boehmite) to the nickel steel slag cementitious material after acidification with hydrochloric acid. The effects of different amounts of acidified pseudo-boehmite on the flow, setting time, mechanical properties and volumetric stability of modified NSSCA-cement were investigated. The results showed that the acidified pseudo-boehmite has better gelling and bonding properties, which will lead to the reduction of the flow rate and setting time of the modified NSSCA-cement net slurry; it will also significantly stimulate the mechanical properties of the modified NSSCA, which will increase the flexural strength and compressive strength of the cement sand. The 28 d flexural strength and compressive strength of NSSCA specimens were improved by 20.1% and 30.3%, respectively, compared with the control group; acidified pseudo-boehmite could promote the hydration of modified NSSCA-cement to generate excess AFt, which together with f-CaO and RO phase in modified NSSCA caused micro-expansion of specimens.
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Published: 09 December 2021
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| Fund:This work was financially supported by the Beijing Natural Science Foundation(51508020). |
| About author:: Chongzhi Li, a professor at Beijing University of Civil Engineering and Architecture, graduated from Tsinghua University with a Ph.D. in Civil Engineering in 2004, mainly engaged in the research on the development and application of concrete admixtures and mineral dopants. |
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