Multifunctional quick repair material for cement concrete pavements and preparation method thereof

Abstract

The invention relates to pavement repair, particularly a multifunctional quick repair material for cement concrete pavements, which is prepared by mixing the following raw materials in percentage by weight: 20-30% of magnesium oxide, 14-26% of ammonium monoacid phosphate, 9-14% of boric acid, 5-20% of aluminate cement, 2-10% of fly ash, 2-10% of rubber powder, 0.5-1.5% of polypropylene fiber, 0.5-1.5% of redispersible latex powder, silica sol and water; the silica sol accounts for 20-60% of the water. The preparation method of the multifunctional quick repair material for cement concrete pavements is implemented by proportionally mixing the raw materials. The material is convenient for construction, has enduring effect after curing, and has quick and enduring repair capacities for most damage forms of cement concrete pavements.

Description

technical field [0001] The invention relates to road surface repair, in particular to a material for road surface repair. Background technique [0002] Road maintenance is one of the important issues facing the field of road engineering today. According to statistics, in recent years, my country has spent more than 30 billion yuan on road maintenance and repairs every year. With the gradual improvement of my country's road traffic network, road maintenance has received more and more attention. Due to the characteristics of high strength, strong bearing capacity, wide application range, rich raw materials, and good durability, cement concrete pavement has always occupied an important position in my country's road network construction and is a very important pavement structure form. However, under the current situation, the service life of cement concrete pavement often does not reach the expected value. Many physical projects have only been open to traffic for a few years, a...

AI Technical Summary

Problems solved by technology

These materials can only achieve the function of sealing the cracks, and cannot support the two walls of the cracks so that they cannot be jointly stressed with the road panels on both sides as a whole. Therefore, when the vehicle puts pressure on the two walls of the cracks, the cracks will spread and expand; in addition, due to these The shrinkage and expansion of the material and the cement concrete material are quite different, which makes it easy to be extruded in summer, and the extruded material falls off from the original place under the action of the wheel. In winter, when the concrete panel shrinks, a large gap is formed in the crack to fill The joint material fails; and, due to the large color contrast between the flexible repair material and the cement concrete pavement, black lines are formed on the pavement after pouring, which seriously affects the performance of the pavement

[0004] For the surface damage of cement concrete pavement, the traditional method of road maintenance department is to use asphalt mixture to repair it locally or cover it as a whole. Although the construction is relatively simple, because the rigidity of the two materials is inconsistent, the shear force between the interface Existence can easily lead to peeling off and failure of repair materials

Another traditional repair method is to remove the damaged concrete and re-pave ordinary concrete that is not lower than the original design strength level. This repair method mainly has the following problems: (1) The shrinkage of the new concrete is larger than that of the old concrete, and it is easy to Cause shrinkage and cracking; (2) Due to interface defects and other reasons, the mutual bond strength between old and new concrete is low, which easily leads to repair failure; (3) Long maintenance period, which brings great pressure to traffic operations

[0006] Rapid repair materials such as polymer concrete, polymer modified concrete, fiber concrete, admixture concrete, and rapid hardening cement are mainly suitable for plate repair and overlay repair, and the scope of use has great limitations, and polymers, fibers and admixtures, etc. are used in a large amount, and the price is relatively expensive, which limits its development and use

[0007] The above description of the status quo of cement concrete pavement repair materials shows that all kinds of existing materials used for cement concrete pavement repair and maintenance have their own defects and limitations in the scope of use

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