Influence of Ultrafine Powder Content on Compressive and Impermeability of Tunnel Lining Concrete under High Ground Temperature Environment

doi:10.19894/j.issn.1000-0518.240127

Chinese Journal of Applied Chemistry ›› 2024, Vol. 41 ›› Issue (9): 1342-1349.DOI: 10.19894/j.issn.1000-0518.240127

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Influence of Ultrafine Powder Content on Compressive and Impermeability of Tunnel Lining Concrete under High Ground Temperature Environment

Jun SHANG¹(), Yi-Fei CUI², Wei-Lin HUANG¹

^1.Hotel Engineering Department，Qingdao Vocational and Technical College of Hotel Management，Qingdao 266100，China
^2.Qingdao University of Technology，School of Civil Engineering，Qingdao 266520，China

Received:2024-04-05 Accepted:2024-07-19 Published:2024-09-01 Online:2024-10-09
Contact: Jun SHANG

Abstract

Abstract:

By simulating the high-temperature service environment of tunnel lining concrete， this study investigates the compressive and impermeable properties of tunnel lining concrete at 20， 60， and ambient temperature of 80 ℃ for 3， 7， and 28 d， and analyzes the changes in compressive and impermeable properties of tunnel lining concrete under high-temperature environmental conditions， in order to provide theoretical support and empirical reference for the construction of tunnel lining concrete under high-temperature environmental conditions. The results indicate that a high-temperature curing environment can improve the compressive strength of tunnel lining concrete at 3 and 7 d， but an 80 ℃ high-temperature curing environment can reduce the compressive strength of tunnel lining concrete at 28 d； With the increase of ultrafine powder content， the compressive strength of tunnel lining concrete first increases and then decreases. When the content is 30%， the compressive strength of concrete is the highest； With the increase of temperature and the addition of ultrafine powder， the electrical flux of tunnel lining concrete generally shows a downward trend. In the same mix， the modal chord length of concrete specimens does not show a significant change with the increase of curing temperature， but the average chord length decreases with the increase of curing temperature.

Key words: High ground temperature, Tunnel lining concrete, Physical and mechanical properties, Ultrafine powder dosage

CLC Number:

O647.9

Jun SHANG, Yi-Fei CUI, Wei-Lin HUANG. Influence of Ultrafine Powder Content on Compressive and Impermeability of Tunnel Lining Concrete under High Ground Temperature Environment[J]. Chinese Journal of Applied Chemistry, 2024, 41(9): 1342-1349.

Figures/Tables 7

Table 1 Amount of cementing material

Groups	1	2	3	4	5	6
Cement/（kg·m^-3）	396	297	277.2	257.4	237.6	217.8
Ultrafine powder/（kg·m^-3）	0	79.2	99	118.8	138.6	158.4
Silica fume/（kg·m^-3）	0	19.8	19.8	19.8	19.8	19.8

Fig.1 3 d compressive strength of concrete

Fig.2 7 d compressive strength of concrete

Fig.3 28 d compressive strength of concrete

Fig.4 Electrical flux of concrete at different temperatures

Fig.5 Effect of ultrafine powder on pore structure

Fig.6 Effect of ultrafine powder on pores

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Influence of Ultrafine Powder Content on Compressive and Impermeability of Tunnel Lining Concrete under High Ground Temperature Environment

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