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Ceramics-Silikáty |
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SHRINKAGE PROPERTIES AND CONTROL TECHNIQUES OF STEEL SLAG-BASED UHPC: SYNERGISTIC CONTROL OF EXPANSIVE AGENTS, SHRINKAGE REDUCING AGENTS, AND PRE-WETTED AGGREGATES (II)
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Han Huichao 1, Guo Ruijie 2,3, Ma Zongjie 2, 3, Li Jingjun 2, 3, Huang Yongbo 4
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1 China Second Metallurgy Group Corporation Limited, Baotou, 014010, China
2 School of Civil Engineering, Inner Mongolia University of Science and Technology, Baotou, 014010, China
3 Inner Mongolia Key Laboratory of Safety and Durability for Civil Engineering, Baotou, 014010, China
4 Shandong Provincial Key Lab of Preparation and Measurement of Building Materials, University of Jinan, Jinan, 250022, China
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Keywords: Steel slag-based UHPC (SS-UHPC), Autogenous shrinkage, Expansive agents (EAs) , Shrinkage-reducing agents (SRAs) , Pre-wet ceramic aggregate (PW-CA)
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To address the issues of shrinkage cracking and poor volume stability in steel slag-based UHPC (SS-UHPC), this study utilised temperature and humidity sensors along with a smart shrinkage and expansion monitoring device. The effects of expansive agents (EAs), shrinkage-reducing agents (SRAs), pre-wet ceramic aggregate (PW-CA), and their various combinations (EA with SRA, EA with PW-CA, SRA with PW-CA) on the shrinkage behaviour of SS-UHPC were investigated, resulting in an effective autogenous shrinkage control strategy with excellent shrinkage reduction. The results showed that the addition of EA and SRA reduced the expansion of SS-UHPC, while the incorporation of PW-CA significantly enhanced its expansion. The use of individual EA, SRA, and PW-CA resulted in a clear reduction in the total autogenous shrinkage of SS-UHPC. Notably, incorporating 6% EA and 0.8% SRA significantly reduced the autogenous shrinkage throughout the process. The shrinkage-reducing effect of SS-UHPC with PW-CA was relatively weak, but incorporating 10% PW-CA showed the best shrinkage reduction. The combined use of EA, SRA, and PW-CA did not show significant reductions in the overall autogenous shrinkage of SS-UHPC. Overall, the combined shrinkage-reducing effect was less effective than using individual agents, with the combination of EA and PW-CA showing significantly better shrinkage reduction than other combinations. This study found that there is a proportional relationship between different shrinkage-reducing materials, and that an appropriate combination ratio significantly affects the autogenous shrinkage of SS-UHPC. The shrinkage-reduction methods developed in this study are comprehensive and effective, making a significant contribution to advancing the practical application of SS-UHPC in engineering. |
doi: 10.13168/cs.2026.0006
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