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Improving the Performance of Ultra-high Performance Concrete Containing Lithium Slag by Incorporating Limestone Powder by Yannian Zhang; Bohan Yang; Xiaowei Gu; Dong Han; Qingjie Wang is a Engineering article available to read on EtoBox.

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To improve the performance of ultra-high performance concrete (UHPC) containing lithium slag (LS-UHPC), this study attempted to replace a part of the lithium slag (LS) in LS-UHPC with limestone powder (LP). And the effect of incorporating different ratios of LS and LP on UHPC was explored. This paper evaluated the fresh behaviors, hydration process, microstructure and compressive strength of LS-UHPC incorporating LP. The results showed that the fluidity of LS-UHPC improved with the increase of LP. The addition of LP shortened the induction period of LS-UHPC. Since LS can supplement SO4 2− for UHPC, both LS-UHPC containing 5% and 10% LP did not show earlier depletion of sulfate. Although the XRD tests did not detect any carboaluminate phase, replacing 5% LS with LP instead reduced the calcium hydroxide content in UHPC, implying the formation of hemicarboaluminate. The incorporation of LP increased the large air voids in LS-UHPC, but refined the pores smaller than 100 nm. The porosity of UHPC was reduced by adding 10% LP, which was related to the synergistic effect between LS and LP. A small amount of LP increased the compressive strength of LS-UHPC at all ages. In conclusion, the op

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Author

Yannian Zhang; Bohan Yang; Xiaowei Gu; Dong Han; Qingjie Wang

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Engineering (Physical Sciences)