The thickness of plastic film should be considered in the maintenance of plastic film, and the width of plastic film should be greater than the width of the ground, preferably more than 60 cm. Cover both sides with soil to prevent water loss. Finally, it should be noted that the lap width between films should be greater than 40 cm.
When the polymer cement waterproof mortar has not reached the hardened state, it shall not be watered for curing or directly washed by rain. After hardening, dry and wet alternate curing method should be adopted. In a humid environment, it can be cured under natural conditions.
In the process of maintenance, the pits and grooves on the road surface that seriously affect traffic safety must be repaired quickly, and even if temporary emergency measures are taken, traffic safety should be ensured. Cracks and joint filling are allowed on the pavement, but pits and grooves are not allowed on the normal pavement, which endangers the driving safety.
Extended data:
In the hardening process of cement, if uneven volume deformation, cracks and bending do not occur, it is called qualified volume stability; If the volume of cement changes unevenly after hardening, causing harmful expansion and cracking or even collapse of buildings, it is called unqualified stability. This cement can't be used in engineering.
If the cement contains too much free calcium oxide or magnesium oxide, especially coarse particles, it will be unqualified in stability if it is stored in the factory for a short time.
Because the burnt calcium oxide and magnesium oxide (above 1000℃) are not fully matured, their hydration is very slow. After cement is solidified, it begins to hydrate under the constraint of cement stone, and cracks will form after volume expansion. In addition, if the content of sulfur trioxide in cement is too high, calcium sulphoaluminate will be generated and its volume will expand, which will also cause poor stability.
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