IMPROVEMENT OF CORROSION PROTECTION OF TUNNEL LINING

Increasing rates of urbanization in Russia and around the world require new approaches to ensure trouble-free operation of municipal tunnels, which are the basis of life support of the city. The modern era is characterized by complication of tunneling and tunnel operation conditions, which often leads to defects in reinforced concrete lining of tunnels, reducing their service life and requiring enormous costs for repair. Furthermore, the implemented repair often fails to guarantee long-term trouble-free operation of the tunnels later on. The paper identifies the main causes of failure of underground utilities. It is shown that when defects appear in lining of underground structures, the greatest hazard is rusting of concrete reinforcement, which, when exposed to moisture in the tunnel air, increases in size several times, which leads to the rupture of concrete and to failure of the whole structure.
The sources of aggressive action on tunnel structure are: soil and rock mass, groundwater; tunnel environment. Destroying the tunnel structure, the aggressive medium promotes flow of various harmful substances into the environment. Reinforced concrete, which is the main material for lining of underground structures of a city, is a compound material composed of steel resisting tension and concrete resisting compression. In aggressive conditions, the lining structure can be durable if concrete is sufficiently resistant and retains the ability to protect reinforcement steel for a long time. The appearance and growth of corrosion of reinforcement indicates protective ability loss of concrete under the influence of external factors, which include physical, physicochemical and chemical processes. The only reliable solution to this problem is to improve these load-bearing materials. This article describes the most effective way of improving materials for lining of underground structures — introduction of additives that increase water permeability and corrosion resistance of concrete and reduces its erosion. For the first time, the procedure of corrosion test of steel reinforcement in concrete with addition of aluminum sulfate is presented. The introduction of such an additive, which is quite cheap and not scarce, can significantly increase the durability of tunnels. In this case, the mobility of the concrete mixture is increased by about 125%, the setting time is slightly reduced, the concrete ceases to let water at a pressure of about 1.2 MPa, and the strength of concrete increases to 150% compared to concrete without additives.

For citation: Kulikova E. Yu. Improvement of corrosion protection of tunnel lining. Gornyy informatsionno-analiticheskiy byulleten'. 2019;3:30-35. [In Russ]. DOI: 10.25018/0236-1493-2019-03-0-30-35.

Keywords

Underground structure, reinforced concrete, steel reinforcement, aluminum sulfate additive, superplasticizer, corrosion.

Issue number: 3
Year: 2019
ISBN: 0236-1493
UDK: 624.191.24.001.5(047)
DOI: 10.25018/0236-1493-2019-03-0-30-35
Authors: Kulikova E. Yu.

About authors: E.Yu. Kulickova, Doctor of Technical Sciences, Professor, e-mail: fragrante@mail.ru, National University of Science and Technology «MISiS», 119049, Moscow, Russia.

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