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Corresponding Author

:唐强,男,博士,教授.E-mail:tangqiang@suda.edu.cn

Abstract

After putting the urban underground tunnels into use, common tunnel diseases such as cracking, leakage, and even collapse caused by concrete cracks occur in the tunnels, making in-depth research on shrinkage-compensating concrete technology an important measure to solve the problem of concrete cracks in underground engineering. This paper studied the feasibility of applying the HME-V expanding admixture to shrinkage-compensating mortar technology from the perspective of mortar, and discussed the basic properties of cement mortar. Meanwhile, compressive, flexural, and consistency tests were conducted on the cement mortar specimens with different HME-V expanding admixture contents (0%, 4%, 8%, 12%, and 16%) and fly ash contents (15%, 20%, 25%) under the water ash ratio of 0.45. The experimental results show that the increasing content of a small amount of the expanding admixture and fly ash can achieve an early strength increase of up to 40%, while excessive content results in the development of small cracks caused by the decrease in cement bonding effect. When the content of the expanding admixture is 8% and the content of fly ash is 20%, the strength reaches its peak. The mortar with this content has sound workability, and the compressive strength at 28 days can exceed 55 MPa. Finally, Real Failure Process Analysis (RFPA) numerical simulation was conducted on the cement mortar specimens, and the simulation results were different from the actual experimental failure process, revealing the entire process from crack development to specimen failure.

Publication Date

8-18-2022

DOI

10.14048/j.issn.1671-2579.2022.04.028

First Page

153

Last Page

158

Submission Date

May 2025

Reference

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