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◆?Construction:
1. ?Preparation
(1)?Determine the slot size
The slot size is based on the local pavement temperature and the road grade. Generally ,the width?shall not?exceed 38mm, depth of the groove shall?not exceed 25mm. The both sides of grooving should remove at least 3mm and should?be grooved?vertically, intact surfaces with no loosely bonded aggregate.
(2) Calculate the amount of materialcontact一三三五五四八六六六三
According to the empirical formula, can use following formula :
Estimation method: width (cm) * depth (cm) * Length (m) * 0.12 (kg)
?E.g.??A?slot pavement : 2cm(width) *2cm(depth)*10m(length ), then crack and joint sealants amount is: 2 *2 *10 * 0.12 = 4.8 kg
2. Grooving
Step one: design the slot size ;
Step two:?adjust to grooving machine ;
Step three: construction
3.?Clearing
For appropriate adhesion , cracks must be cleaned and dried before pouring. After grooving or cleaning?impurities, and then use high pressure ,oil free ,dry compressed air at 90psi (620kpa )minimum ,to remove any remaining dust .contact一三三五五四八六六六三
4. Preheating
It must preheat groove when the temperature is below 4°C.What we done just ensure the temperatureabove 10°C.
5. Pouring
Putting the crack and joint sealants into groove when the temperature reaches 185°C. It?needs pouring several?times until the cracks filled.
6. Maintenancecontact一三三五五四八六六六三
Clearing the site after the Crack and Joint Sealants Sufficient cooling(about 15-25min).
It must be sprayed a layer of sand or powder?if you need to open the traffic immediately.
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