Comparison of the condition of steel fiber-reinforced shotcrete with water-glass and alkali-free activators after more than 20 years of service in a subsea road tunnel

Manquehual, Cristobal Javier; Jakobsen, Pål Drevland; Holter, Karl Gunnar; Weerdt, Klaartje De; Danner, Tobias; Bruland, Amund

doi:10.1016/j.conbuildmat.2022.127090

Cited by 6 publications

(3 citation statements)

References 24 publications

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“…Corrosion of the steel fibres was only observed in the carbonation zone at the intrados of the linings. Given the uncertainties about concrete composition and variations over the 6.8 km long tunnel, the study indicates no clear negative long-term durability of concerns of sprayed concrete with alkali free accelerators compared to water glass accelerators [25].…”

Section: Effect On Durabilitymentioning

confidence: 82%

“…Recently research by Manquehual et al [25] on the effect of both old-fashioned water glass and modern alkali-free accelerators provide information about performance of alkali free accelerators in sprayed concrete with the (to our knowledge) longest service life so far -greater than 20 years at the time of writing. The tunnel linings studied in their paper were the first use of sprayed concrete linings with aluminium sulphate based set accelerators in Norwegian road tunnels [25].…”

Section: Effect On Durabilitymentioning

confidence: 99%

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Effect of Set Accelerator on Capillary Suction and Porosity of Concrete – Cast Samples with Constant Water/Binder Ratio

Trussell

Cepurītis

Jacobsen

2022

Nordic Concrete Research

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Alkali-free set accelerators are added at the nozzle to ensure rapid set of wet sprayed concrete. The accelerator affects the strength development, porosity and transport properties, and hence the durability, of the sprayed concrete. We developed a method to cast samples with varying set accelerator doses to measure the effect of the accelerator on porosity, but with a constant effective water/binder ratio of 0.45 for each accelerator dose. Six cylinders of concrete were cast with set accelerator doses of 0, 2, 4, 6, 8 and 10 % of effective binder mass. High workability was achieved to enable mixing before rapid stiffening occurred, though this high workability led to some aggregate settlement in the cylinders. Porosity was measured by capillary suction on dried specimens of hardened concrete and subsequent pressure saturation of macro pores (PF test). The samples cast with higher doses of set accelerator had higher suction porosities and higher rates of capillary suction. Using a modified Powers equation gave very low calculated degree of hydration values for concrete with set accelerator, indicating that the equation is not applicable for concrete with set accelerators, due to the higher suction porosity in accelerated matrices, caused by different hydration products.

show abstract

Section: Effect On Durabilitymentioning

confidence: 82%

Section: Effect On Durabilitymentioning

confidence: 99%

Effect of Set Accelerator on Capillary Suction and Porosity of Concrete – Cast Samples with Constant Water/Binder Ratio

Trussell

Cepurītis

Jacobsen

2022

Nordic Concrete Research

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show abstract

“…The conclusion was that composite fiber shotcrete and basalt fiber shotcrete had better flatness and compactness than plain concrete, and basalt fiber shotcrete was more economical than composite fiber shotcrete. However, compare with the application of steel fiber reinforced concrete and polypropylene fiber concrete (Hagelia, 2011;Bhasin and Aarset, 2020;Jiang et al, 2020;Alencar Monteiro and Andrade Silva, 2021;Manquehual et al, 2022), the application of basalt fiber reinforced concrete was limited. Basalt fiber is a kind of new inorganic fiber material with good physical and mechanical properties, and it has the characteristics of high cost performance and easy access to materials.…”

Section: Fiber Typesmentioning

confidence: 99%

The effect of basalt fiber addition on cement concrete: A review focused on basalt fiber shotcrete

Liu

Song

et al. 2022

Front. Mater.

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Basalt fiber, as a natural silicate fiber, has excellent engineering performance in high and low temperature resistance, high fracture strength, toughness, shear and elastic modulus in nature. Shotcrete was widely used in tunnel lining, slope support, coal mine roadway and other projects. With the continuous development of shotcrete technology, scholars found that adding fiber to shotcrete would greatly improve the performance of shotcrete. Compared with traditional plain shotcrete and steel fiber shotcrete, shotcrete incorporated with basalt fiber can dramatically improve the bending resistance, toughness and durability, therefore effectively improving the engineering performance of concrete structure, such as lining support. This paper summarized and discussed the mechanical properties, early age performance, durability and practical applications of basalt fiber reinforced concrete with a focus on basalt fiber shotcrete (BFSC). Meanwhile, it focused on the engineering performance improvement and enhancement mechanisms of basalt fiber as a mineral admixture into shotcrete, and assessed the deficiencies existing in the current research. Eventually, the suggestions and prospects for future BFSC related research were proposed.

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Investigation of leaching in steel fiber-reinforced shotcrete exposed to fresh and saline groundwater in a subsea road tunnel

Manquehual

Jakobsen

Holter

et al. 2023

Cement and Concrete Research

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Comparison of the condition of steel fiber-reinforced shotcrete with water-glass and alkali-free activators after more than 20 years of service in a subsea road tunnel

Cited by 6 publications

References 24 publications

Effect of Set Accelerator on Capillary Suction and Porosity of Concrete – Cast Samples with Constant Water/Binder Ratio

Effect of Set Accelerator on Capillary Suction and Porosity of Concrete – Cast Samples with Constant Water/Binder Ratio

The effect of basalt fiber addition on cement concrete: A review focused on basalt fiber shotcrete

Investigation of leaching in steel fiber-reinforced shotcrete exposed to fresh and saline groundwater in a subsea road tunnel

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