Waste concrete reclaimed tunnel back lining grouting material and preparation method thereof

Abstract

The invention belongs to the field of construction materials, and relates to a waste concrete reclaimed tunnel back lining grouting material and a preparation method thereof. The tunnel back lining grouting material comprises 400-600 kg / m<3> of waste concrete, 100-300 kg / m<3> of mineral slag and / or steel slag, 750-1350 kg / m<3> of sand, 350-630 kg / m<3> of water, 10-40 kg / m<3> of silica fume, 5-25 kg / m<3> of superfine zeolite powder, 0.3-0.6 kg / m<3> of hydroxyethyl cellulose, 0.1-0.3 kg / m<3> of polyacrylamide, 0.2-0.4 kg / m<3> of sulfamate, 2.0-3.6 kg / m<3> of naphthalene water reducing agent and 0.2-0.5 kg / m<3> of sodium gluconate. The waste concrete is effectively reclaimed to prepare the cement-free grouting material which has high stability, high water dispersion resistance, high water-reducing plastic-retaining properties and adjustable setting time under high-water-pressure water-saturation conditions, thereby greatly improving the working property and durability of the common grouting material.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a recycled tunnel backing grouting material for waste concrete and a preparation method thereof. Background technique [0002] With the continuous construction of large-scale cross-river and sea tunnels at home and abroad, the shield construction technology under various working conditions will face severe challenges. In the case of large sections and high water pressure, when ordinary synchronous grouting materials are washed by water in high-pressure water-rich formations, the grouting materials will be diluted, resulting in the destruction of the material structure, not only can not play the role of filling the formation purpose, and will directly affect the stability of the segment lining structure, the slurry flows into the segment arch bottom, lifts the segment, and intensifies the uplift of the segment. At the same time, the durability of synchronous grouting...

AI Technical Summary

Problems solved by technology

[0004] Synchronous grouting materials for ordinary shield tunnels are mainly designed to fill the ground, reduce foundation subsidence, ensure environmental safety, and serve as reinforcement layers for lining structures, but lack functional design and evaluation of materials under special site conditions, especially Under the condition of high water pressure and saturated water, the slurry is easily washed by water, which causes the slurry to lose its filling function, resulting in an unsupported state of the segment. At the same time, the tunnel segment can be regarded as immersed in the liquid, and it will inevitably rise and fall under the action of buoyancy. The subsidence of the foundation seriously affects the structural safety of the tunnel

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