| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Study on the Mechanical Properties of CaCO3 Whisker-enhanced Artificial Aggregates |
| GAO Peng1,2,3, XU Erdong1, TAO Shuqing1, WANG Guotao4,*, ZHENG Qing3,5, NI Mingxing3,5, NING Xiaolong1, ZHAN Binggen1,6,7, YU Qijun1,2,3
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1 School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, China;
2 Engineering Research Center of Low-carbon Technology and Equipment for Cement-based Materials, Ministry of Education, Hefei 230009, China;
3 Anhui Key Laboratory of Green and Low-carbon Technology in Cement Manufacturing, Hefei 230009, China;
4 Hainan Hengbao Concrete Engineering Co., LTD, Haikou 570300, China;
5 Hefei Cement Research & Design Institute Corporation LTD, Hefei 230009, China;
6 Anhui Province Cement Based Materials Low Carbon Technology Engineering Research Center, Hefei 230009, China;
7 Anhui Key Laboratory of Civil Engineering Structures and Materials, Hefei 230009, China |
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Abstract Using recycled concrete powder to produce artificial aggregates reduces urban solid waste and partially replaces natural aggregates. However, artificial aggregates derived from recycled concrete powder exhibit lower mechanical strength and durability. This work investigated the effects of calcium carbonate whiskers (CW) as microscale reinforcements on the strength, density, and water absorption of artificial aggregates. The reinforcement mechanisms were analyzed using scanning electron microscopy (SEM). The results show that the aspect ratio of CW significantly influences its reinforcement efficacy. Specifically, as the dosage of CW1 (high aspect ratio) increases from 0% to 2.5%, the mechanical properties of the aggregates initially improve before declining. At an optimal dosage of 1.5%, the single-particle strength, cylinder compressive strength, and apparent density reach peak values of 2.36 MPa, 5.2 MPa, and 1 550 kg/m3, respectively. Increasing CW1 content reduces water absorption while increasing bulk density, with a significant negative correlation between these properties. SEM analysis reveals that CW enhances aggregate performance through a synergistic combination of filling, crack resistance, and bridging effects. Specifically, CW fills micro-pores and micro-cracks within the aggregates and provides tensile strength by bridging crack ends, significantly improving crack resistance.
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Published: 25 July 2026
Online: 2026-08-12
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2026, Vol. 40 
