Semi-rigid base crack trenchless grouting repair material and preparation method thereof

Abstract

The invention relates to a semi-rigid base crack trenchless grouting repair material and a preparation method thereof. The semi-rigid base crack trenchless grouting repair material comprises the following components in parts by weight: 70-100 parts of a two-component polyurethane prepolymer, 10-15 parts of diatomite powder, 150-200 parts of cement, 60-80 parts of water and 1.0-2.0 parts of a retarder. The diatomite, the cement and the polyurethane form a network interpenetrating multi-element composite structure, so that the compactness and the bonding strength of the splicing interface part of the new pavement base layer and the old pavement base layer are favorably improved. The activity of the diatomite can be excited after calcination and ball milling, the average particle size of the calcined and ball-milled diatomite becomes smaller, the particle size distribution is wide, the specific surface area becomes larger, the faster the reaction speed with calcium hydroxide in cement paste is, the more hydration products in unit time are, and the quantity of hydrated calcium silicate in cement paste is increased. The calcium-silicon ratio and the content of calcium hydroxide are reduced, and the strength of cement is improved.

Description

technical field [0001] The invention belongs to a grouting material for roadbed and pavement repair, in particular to a non-excavation grouting repairing material for semi-rigid base cracks and a preparation method thereof. Background technique [0002] Highway disease refers to the phenomenon of cracks, potholes, looseness, hugging, etc. on the road surface under the combined action of driving and natural factors after the road is completed and put into use. Among them, crack diseases are the main ones. Taking Jiangsu Province as an example, crack diseases account for 75% to 95% of highway diseases, and crack diseases are mainly reflective cracks in semi-rigid bases, accounting for 90%. %~95%. [0003] At present, the treatment methods for reflective cracks in semi-rigid base mainly include: overlay treatment, excavation and repair, and grouting reinforcement. It is widely used in the repair of cracks. The method is to use air pressure or hydraulic pressure to inject gro...

AI Technical Summary

Problems solved by technology

Although the grouting effect is affected by factors such as grouting materials, grouting equipment, and on-site construction technology, the performance of the grouting material is the key to the grouting technology, and the performance of the grouting material directly affects the repair effect of the crack.

[0004] At present, the commonly used grouting materials mainly include cement slurry, geopolymer or polyurethane. It is difficult to inject the slurry into small gaps when using cement grouting material, resulting in incomplete repair, and there is still a hidden danger of secondary cracking; using geopolymer grouting material There is a problem of poor post-shrinkage effect, and the use of polyurethane grouting materials cannot play a role in structural reinforcement, and the treatment effect on reflective cracks is not ideal