How to Use Grouting Material to Repair Concrete Pavement

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Shandong Xindadi Group


How to Use Grouting Material to Repair Concrete Pavement

Generally speaking, after the expressway with cement concrete pavement is completed and opened to traffic for a period of time, uneven sinking of some parts may occur due to vehicle overloading, local weakness of subgrade and other reasons, causing the road surface to sink and lead to the phenomenon of car jumping. If it is not handled in time, problems such as empty bottom, broken board, churn, wrong platform, edge collapse, potholes and so on will occur, and finally it will develop into serious broken board, it seriously affects the safety and comfort of driving, and affects the driving speed and road appearance. So how to better solve this situation?
Limited by factors such as construction scale, construction thickness, and maintenance after paving, we generally use board replacement.grouting materialLaw of reinforcement. Since the root cause of the road depression is usually the weakness of the roadbed, the general leveling method cannot effectively and firmly deal with the problem. After a period of opening to traffic, the old disease recurs, making the work frequent, repeated and endless, not only wasting a lot of money, but also causing Very bad social impact. The use of high-strength non-shrinkage grouting material technology to reinforce the roadbed first, and then use the leveling scheme, can effectively solve the occurrence of this problem.
Reasonable use of high-strength grouting material slurry pressure and create a suitable lifting force can make the sinking building rise to a fairly accurate position. Using the principle of compaction grouting, very thick slurry is poured into the soil through drilling, and the soil is compacted at the grouting point to form slurry bubbles. When the diameter of the slurry bubble is small, the grouting pressure basically expands along the radial direction of the borehole, that is, horizontally. With the gradual increase of the size of the slurry bubble, a large upward lifting force will be generated to lift the road surface.
The principle of using grouting material in soil reinforcement can be described as follows: the prepared slurry is sent to the soil layer to be reinforced by using a special double-liquid grouting system. The slurry first fills the cracks of the soil (does not enter between particles) and sets quickly. After the cracks are "blocked", the grouting pressure rises automatically, causing "hydraulic cracking" of the soil. The slurry enters along the cracks and sets quickly, the inlet channel is also "blocked", thus creating a new splitting surface. At the same time, with the continuous entry of high-strength grouting material, the initial setting of the slurry squeezes the soil on the split surface, causing the soil particles to move, rearrange and then dehydrate. The above processes do not occur one by one, but almost simultaneously, and are repeated continuously and densely in the same way in different parts within a certain range, so that the reinforced soil can fully receive the dual effects of splitting grouting and compaction grouting. However, to obtain this effect, it is not necessary to have the higher grouting pressure necessary for splitting grouting and compaction grouting, and generally, the grouting pressure of 0.1 ~ 0.5MPa can be used to make all kinds of soils fully into the grout. The controllability of the solidification time of the grouting material makes the soil prone to "hydraulic cracking", and at the same time, the slurry will not "run" too far and cause waste. In summary, the role and advantages of grouting material in repairing concrete pavement are obvious.

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