WANG G, CAI J,et al.Experimental study on nano-modified Portland cement-based grouting materials[J].Journal of Henan Polytechnic University(Natural Science) ,2026,45(1):197-204.

doi:10.16186/j.cnki.1673-9787.2024030080

Received:2024/03/29

Revised:2024/06/14

Published:2025-12-03

Experimental study on nano-modified Portland cement-based grouting materials

Wang Gang1,2, Cai Jin1,2

1.Shandong Key Laboratory of Civil Engineering， Disaster Prevention and Mitigation， Shandong University of Science and Technology， Qingdao  266590， Shandong， China；2.College of Civil Engineering and Architecture， Shandong University of Science and Technology， Qingdao  266590， Shandong， China

Abstract: Objectives To address issues in rock mass microfracture grouting for reinforcement and seepage control， this study investigated nano-modified Portland cement-based grouting materials. Methods A nano-modified grouting material was developed using Taguchi-grey correlation optimization combined with orthogonal tests. Signal-to-noise ratio analysis based on the Taguchi method was applied to systematically evaluate the effects of nano-CaCO₃， polycarboxylate superplasticizer， ultrafine fly ash， and water–cement ratio on the grouting material’s viscosity， bleeding rate， setting time， and 28 d stone body strength. Results The orthogonal tests showed that the material prepared under the optimal ratio from Taguchi-grey correlation optimization exhibited excellent fluidity and mechanical properties， ensuring injectability and reinforcement performance. Signal-to-noise ratio analysis indicated： nano-CaCO₃ significantly increased viscosity while reducing bleeding rate； 28 d stone strength first increased and then decreased with increasing nano-CaCO₃ content. Polycarboxylate superplasticizer reduced viscosity but prolonged setting time and slightly increased bleeding rate， with minor effect on 28 d strength. Ultrafine fly ash also decreased viscosity but was unfavorable for shortening setting time or improving 28 d strength. The water-cement ratio had the most pronounced effect on bleeding rate， setting time， and 28 d strength： increasing water-cement ratio improved fluidity but prolonged setting and reduced 28 d strength. Conclusions The developed nano-modified Portland cement-based grouting material demonstrated good fluidity， stability， and mechanical performance. These findings provide theoretical and experimental guidance for material selection in practical grouting engineering.

Key words:grouting material;orthogonal test;Taguchi method;nano-CaCO;microfracture