Method for repairing cracks of special concrete grouting

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The grouting material is made of high-strength material as aggregate and cement as binder, supplemented by high fluid state, micro-expansion, anti-segregation and other materials. It adds a certain amount of water to the construction site and can be used after mixing. The grout has good self-flowing property, fast and hard, early strength, high strength, no shrinkage, micro-expansion; non-toxic, harmless, non-aging, no pollution to water quality and surrounding environment, good self-tightness, anti-rust and so on. In terms of construction, it has the advantages of reliable quality, reduced cost, shortened construction period and convenient use.

1. Direct filling method: Applicable to the shrinkage crack of concrete grout generated during construction. Before the vehicle is opened, once the concrete grout is found to have cracks, it can be directly poured with high-performance grouting material.
2. Nozzle filling method; applicable to repair cracks in winter roads. The infusion process is: clearing the seam→burying the grouting nozzle to close the crack→preparing the filling material→grouting→heating enhancement.
Clearing the seam; using a special nozzle of compressed air with a small lead wire to pull out the dirt and other debris in the gap.
The grouting nozzle is buried to close the crack; the grouting nozzle is usually set at about 30cm, and the crack is heated and melted by rosin and paraffin in a ratio of 2:1, and then the seam is pasted with a tape, and rosin and paraffin are applied.
With the filling material; according to the width of the filling opening and the required opening time, select the appropriate grouting material and mix ratio, mix and adjust evenly and pour into the small aluminum pan.
Grouting; pour the configured grouting material into a plexiglass tube syringe or other special grouting device. Generally, it is recommended to use a pressure drop grouting material from 30 to 40 minutes to fill the grout from each grouting nozzle until it is full. Until the tape above. It is recommended to add a layer of cement or mortar to the surface and spray the curing agent to make the surface color consistent.
Heating is enhanced; generally, it is better to use infrared lamps or long strips with 60~100W bulbs to heat the filled joints. The temperature is controlled between 50~60°C, and heating for 1~2h, it can be opened to traffic.
3, drilling grouting method; can be used for repairing cracks in winter.
A row of 15mm diameter holes are drilled along the crack to form a strip-shaped groove; a compressed air lance is inserted into the slot to remove the concrete grout residue; the clean small gravel is filled into the hole and along the hole Hole groove grouting; cover the decorative notch with latex cement; heat it for 1~2h with infrared rays, etc., to promote the grout to reach the strength, then open to traffic.
Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn

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