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Author:

Yuan, Qiang (Yuan, Qiang.) | Xue, Kaiwei (Xue, Kaiwei.) | Zhang, Suhui (Zhang, Suhui.) | Tian, Yi (Tian, Yi.) | Hu, Chaolong (Hu, Chaolong.) | Liu, Xiao (Liu, Xiao.)

Indexed by:

EI Scopus SCIE

Abstract:

The high geothermal environment causes a temperature gradient inside shotcrete, which affects the development of its mechanical strength. This research investigated the strength evolution of shotcrete in simulated high geothermal environment by applying a unidirectional heat source. The influence of temperature gradient on the pore structure, morphology, phase composition, and hydration degree of shotcrete was also studied. It was found that the early strength of shotcrete was improved but that the later strength was reduced in the high geothermal environment. It was attributed to the increase in harmful porosity and total porosity of the concrete caused by the high-temperature curing. Cracks and pores can be observed in the microstructure near the heat source region. Besides, the ettringite content in shotcrete was lower than that under standard curing environment and presented gradient distribution in the direction of the temperature gradient.

Keyword:

Porosity Microstructure High geothermal environment Strength Shotcrete

Author Community:

  • [ 1 ] [Yuan, Qiang]Cent South Univ, Sch Civil Engn, Changsha 410075, Peoples R China
  • [ 2 ] [Xue, Kaiwei]Cent South Univ, Sch Civil Engn, Changsha 410075, Peoples R China
  • [ 3 ] [Zhang, Suhui]Cent South Univ, Sch Civil Engn, Changsha 410075, Peoples R China
  • [ 4 ] [Tian, Yi]Cent South Univ, Sch Civil Engn, Changsha 410075, Peoples R China
  • [ 5 ] [Yuan, Qiang]Natl Engn Res Ctr High Speed Railway Construct Tec, Changsha 410075, Peoples R China
  • [ 6 ] [Xue, Kaiwei]Natl Engn Res Ctr High Speed Railway Construct Tec, Changsha 410075, Peoples R China
  • [ 7 ] [Zhang, Suhui]Natl Engn Res Ctr High Speed Railway Construct Tec, Changsha 410075, Peoples R China
  • [ 8 ] [Tian, Yi]Natl Engn Res Ctr High Speed Railway Construct Tec, Changsha 410075, Peoples R China
  • [ 9 ] [Hu, Chaolong]China Railway No 10 Engn Grp Co Ltd, Mat Ind & Trade Co Ltd, Beijing, Peoples R China
  • [ 10 ] [Liu, Xiao]Beijing Univ Technol, Minist Educ, Fac Mat & Mfg, Key Lab Adv Funct Mat, Beijing 100124, Peoples R China

Reprint Author's Address:

  • [Yuan, Qiang]Cent South Univ, Sch Civil Engn, Changsha 410075, Peoples R China;;[Yuan, Qiang]Natl Engn Res Ctr High Speed Railway Construct Tec, Changsha 410075, Peoples R China

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Source :

ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING

ISSN: 1644-9665

Year: 2024

Issue: 2

Volume: 24

4 . 4 0 0

JCR@2022

Cited Count:

WoS CC Cited Count:

SCOPUS Cited Count: 4

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 1

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