Strength Development of Two-Component Grouts for Annular Gap Grouting

1 Schematical presentation of annular gap grouting Quelle/credit: Ruhr-Universität Bochum
1 Schematical presentation of annular gap grouting
Quelle/credit: Ruhr-Universität Bochum
2 Strength development of a two-component mortar [3] Quelle/credit: Ruhr-Universität Bochum
2 Strength development of a two-component mortar [3]
Quelle/credit: Ruhr-Universität Bochum
3 Sample manufacturing of two-component mortar in laboratory: a) Mixing the components; Quelle/credit: Ruhr-Universität Bochum
3 Sample manufacturing of two-component mortar in laboratory: a) Mixing the components;
Quelle/credit: Ruhr-Universität Bochum
b) Filling the mould; Quelle/credit: Ruhr-Universität Bochum
b) Filling the mould;
Quelle/credit: Ruhr-Universität Bochum
c) Smoothing the surface Quelle/credit: Ruhr-Universität Bochum
c) Smoothing the surface
Quelle/credit: Ruhr-Universität Bochum
4 On the left: usual 2KM; on the right: same composition, accelerator coloured with pigments Quelle/credit: Ruhr-Universität Bochum
4 On the left: usual 2KM; on the right: same composition, accelerator coloured with pigments
Quelle/credit: Ruhr-Universität Bochum
5a By means of additional weight adjusted tension [N/mm²] Quelle/credit: Ruhr-Universität Bochum
5a By means of additional weight adjusted tension [N/mm²]
Quelle/credit: Ruhr-Universität Bochum
5b modification of Vicat needle tester Quelle/credit: Ruhr-Universität Bochum
5b modification of Vicat needle tester
Quelle/credit: Ruhr-Universität Bochum
6 Early strengths up to one hour after production measured by modified Vicat needle tester Quelle/credit: Ruhr-Universität Bochum
6 Early strengths up to one hour after production measured by modified Vicat needle tester
Quelle/credit: Ruhr-Universität Bochum
7 Development of shear strength between 25 to 80 minutes after production Quelle/credit: Ruhr-Universität Bochum
7 Development of shear strength between 25 to 80 minutes after production
Quelle/credit: Ruhr-Universität Bochum
8 Development of compressive strength up to 91 days after production Quelle/credit: Ruhr-Universität Bochum
8 Development of compressive strength up to 91 days after production
Quelle/credit: Ruhr-Universität Bochum
9 Development of stiffness modulus up to 56 days after production Quelle/credit: Ruhr-Universität Bochum
9 Development of stiffness modulus up to 56 days after production
Quelle/credit: Ruhr-Universität Bochum

In mechanized tunnelling an early and safe bedding of the last inserted segment rings is a constructive necessity. This can purposefully be achieved by using a two-component mortar as grouting material whose composition is adapted for the geological and structural circumstances. For this purpose, the operating side requires knowledge about possible control parameters based on optimization in terms of material as well as a fundamental understanding of the strength development of a two-component mortar.

1 Introduction and Motivation

In mechanized tunnelling with segmental lining a cavity emerges during the production of the tunnel between the surrounding soil and the exterior wall of the tunnel with a size of generally 10 to 20 cm [1]. This annular gap must be backfilled using a suitable material in order to reduce surface settlements as well as stabilize the segmental lining appropriately at the same time for ensuring durability and serviceability of the construction.

Thereby a complete filling of the annular gap is necessary. Additionally, the mortar must be able to absorb the operating...

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