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Ceramics-Silikáty |
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SYNERGISTIC ENHANCEMENT OF UHPC PERFORMANCE BY ULTRAFINE SLAG AND LIMESTONE POWDER: PORE STRUCTURE FRACTAL CHARACTERIZATION AND INSIGHTS INTO MICROSTRUCTURAL EVOLUTION WITH C-(A)-S-H GEL POLYMERIZATION
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Chen Zhengzheng 1, Chu Jun 1, Chen Changmin 2, Luan Congqi 1, Li Gaonian 3, Pang Bo 4, Wang Jianling 5, Ren Zunchao 6, Wang Wei 7
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1 School of Resources and Civil Engineering, Suzhou university, 234000, China
2 Shandong Zhengyuan Construction Engineering Co., Ltd. Jinan 250100, China
3 PowerChina Huadong Engineering Corporation Limited, Hangzhou, 311122, China
4 School of Civil Engineering, Qingdao University of Technology, Qingdao, 266520, China
5 Qingdao Haihe Underwater Technology Engineering Co., Ltd.Qingdao, 266520, China
6 The First Company of China Eighth Engineering Bureau Ltd, Jinan 250100, China
7 Conservatory of music, Suzhou university, 234000, China
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Keywords: UHPC, Synergistic effect, Ultrafine slag, Limestone, Microstructure
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This paper examines the combined influence of ultrafine slag (USL) and limestone powder (LS) on the microstructural evolution and mechanical performance of aluminum-rich cement-based UHPC. Experimental findings show that the optimal mix of 20% USL and 10% LS (U20L10) achieves a 28-day compressive strength of 155.8 MPa and the lowest chloride migration coefficient. The synergistic mechanism involves LS providing nucleation sites to accelerate early hydration, USL consuming calcium hydroxide to generate additional C-S-H, and LS reacting with aluminate to form monocarboaluminate (Mc), increasing paste density. U20L10 yields C-S-H with the greatest mean chain length and Al/Si ratio, minimal total porosity, and optimized pore architecture. Fractal dimension (Ds) positively correlates with compressive strength and fine capillary pores (3–50 nm), and negatively with chloride migration, suggesting its potential as a useful parameter for characterizing pore structure and performance within the studied mixture system. Thus, combined USL and LS is an effective strategy for producing durable, high-performance UHPC. |
doi: 10.13168/cs.2026.0031
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