Cracks are mainly divided into: 1. Structural damage cracks caused by the action of driving loads; Temperature cracks caused by temperature changes in the asphalt surface layer, including non load cracks such as low-temperature shrinkage cracks and temperature fatigue cracks. Domestic and foreign studies have shown that the reflection cracks of semi-rigid base asphalt pavement correspond to non load type, caused by temperature changes, and in some cases may also be generated by the combined action of temperature and load.
Destructive cracks are usually caused by structural damage to the asphalt concrete pavement, known as "surface" damage, which can only be removed by excavation "surgery". Reflective cracks, on the other hand, belong to "line" damage when they first appear. It is important to seize the opportunity and immediately fill the cracks with grout. The original asphalt concrete pavement should be well connected, forming a stretching effect with elastic expansion joint properties, sealing off the intrusion of rain (snow) water and debris on the road surface, delaying the speed of road damage, and achieving preventive maintenance effects. Otherwise, with the intrusion of rain (snow) water and debris, the cracks will continue to expand and develop into the first type of cracks, namely destructive cracks. In the end, only "surgery" can be carried out to repair the potholes, which will affect the safety and smoothness of the highway and increase maintenance costs.
Slotting and grouting repair process and method
The slotting and grouting repair method is suitable for small and medium-sized cracks and is a commonly used crack treatment method abroad. The main equipment used includes slotting machines and grouting machines. The slotting size should be at least 25px wide and 1-75px deep. The depth to width ratio of the slotting should not exceed 2:1, and the lower the depth ratio, the better. The construction process of slotting repair method generally consists of 5 steps.
(1) Preparation work. Check the slotting machine and grouting machine to ensure their technical condition is good; Determine the joint filling design plan based on the specific situation of road cracks; Start the grouting machine;
(2) Slot. Adjust the slotting depth of the slotting machine in advance according to the designed slotting size, and then proceed with the slotting operation. During homework, adjust the slot size in a timely manner according to the type of crack width to meet the minimum design requirements.
(3) Clear the groove. Use a hair dryer to thoroughly clean the debris and dust within a range of at least 250px on both sides of the cracks in the groove.
(4) Grouting. If the seam is repaired when the temperature is below 4 ℃, the grouting machine must be equipped with preheating equipment to preheat the slotted area. If the seam is repaired without preheating at this temperature, it will reduce the bonding strength; If the joint is repaired when the temperature is above 4 ℃, preheating is not necessary. Generally, the joint repair effect after preheating is better.
(5) Maintenance. After grouting, traffic can only be opened after sufficient cooling and cleaning of debris on the road surface.
Precautions for slotting and grouting construction
When applying this technology, the following points should be grasped: firstly, the earlier the grouting timing, the better; Secondly, it is necessary to select good grouting equipment and grouting materials; Thirdly, it is necessary to strictly follow the construction process requirements for the operation.
Destructive cracks are usually caused by structural damage to the asphalt concrete pavement, known as "surface" damage, which can only be removed by excavation "surgery". Reflective cracks, on the other hand, belong to "line" damage when they first appear. It is important to seize the opportunity and immediately fill the cracks with grout. The original asphalt concrete pavement should be well connected, forming a stretching effect with elastic expansion joint properties, sealing off the intrusion of rain (snow) water and debris on the road surface, delaying the speed of road damage, and achieving preventive maintenance effects. Otherwise, with the intrusion of rain (snow) water and debris, the cracks will continue to expand and develop into the first type of cracks, namely destructive cracks. In the end, only "surgery" can be carried out to repair the potholes, which will affect the safety and smoothness of the highway and increase maintenance costs.
Slotting and grouting repair process and method
The slotting and grouting repair method is suitable for small and medium-sized cracks and is a commonly used crack treatment method abroad. The main equipment used includes slotting machines and grouting machines. The slotting size should be at least 25px wide and 1-75px deep. The depth to width ratio of the slotting should not exceed 2:1, and the lower the depth ratio, the better. The construction process of slotting repair method generally consists of 5 steps.
(1) Preparation work. Check the slotting machine and grouting machine to ensure their technical condition is good; Determine the joint filling design plan based on the specific situation of road cracks; Start the grouting machine;
(2) Slot. Adjust the slotting depth of the slotting machine in advance according to the designed slotting size, and then proceed with the slotting operation. During homework, adjust the slot size in a timely manner according to the type of crack width to meet the minimum design requirements.
(3) Clear the groove. Use a hair dryer to thoroughly clean the debris and dust within a range of at least 250px on both sides of the cracks in the groove.
(4) Grouting. If the seam is repaired when the temperature is below 4 ℃, the grouting machine must be equipped with preheating equipment to preheat the slotted area. If the seam is repaired without preheating at this temperature, it will reduce the bonding strength; If the joint is repaired when the temperature is above 4 ℃, preheating is not necessary. Generally, the joint repair effect after preheating is better.
(5) Maintenance. After grouting, traffic can only be opened after sufficient cooling and cleaning of debris on the road surface.
Precautions for slotting and grouting construction
When applying this technology, the following points should be grasped: firstly, the earlier the grouting timing, the better; Secondly, it is necessary to select good grouting equipment and grouting materials; Thirdly, it is necessary to strictly follow the construction process requirements for the operation.
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