求翻译：（3）加强基层养护，在基层施工完成后，采用麻袋进行养护，也可以采用喷洒沥青乳液保护。若不能封闭交通，应限制重车通行， 其车速不应超过20km／ h，同时应注意其他交通设施对基层的损坏。若出现车槽（坑槽）松散，应采用相同材料修补压实。严禁用松散粒是什么意思？

(3) strengthening grassroots conservation, upon completion of the construction, used sacks for the conservation, protection of asphalt emulsion sprays can also be used. If it cannot be closed to traffic, should limit heavy vehicle traffic, its speed should not exceed 20km/h, taking note that damage to other transport facilities on the base. If the car slots (pit) loose patch compaction should adopt the same material. No loose grain