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外文翻譯---淺談水泥混凝土路面縱向裂縫的防治-閱讀頁

2025-01-30 02:26本頁面
  

【正文】 ors of vertical cracks, but there can be summarized in the following categories. (1) Fill Embankment Vertical cracking is mainly due to the high embankment of filling from the ground to the top surface of the road bed is greater than 80cm away from the roadbed subgrade paction of such degrees can not design or specification requirements. But sometimes also increase as a result of subroadbed filling the vertical joints and handled properly, or the thickness increase is too large, in the opening between the two has bee the weak side. (2) Half filled and halfdug into the old road embankment Halffilled and the old road a halfdug into the road in the new way to fill one side of the new and the old roadbed excavation side of the seven Department, if handled properly, it often appears in the vertical cracks here. In particular, the side excavation is hard soil or rock, there a greater chance of vertical cracks. (3) Zerofilling and excavation subgrade If this type of subgrade vertical crack is not handled properly or not based on thorough, based on the strength of the bid opening should be less than the capacity. In the past and the existing norms and standards, the excavation and zerofilled sections of the basis for the treatment of only the roadbed (way below the top surface slot 0 ~ 30cm) made a request, and on the road under the bed (the way trough the following top 30 ~ 80cm) do not require natural state can be. On ordinary soil, the natural state of the dry density of the soil maximum dry density is only about 80%. Its bearing capacity is relatively low。 second is due to the reasons for the construction of paving concrete slabs less than the design value of strength. (1)Concrete strength less than the design requirements Lead to less than the strength of the concrete itself has two aspects. First, the quality of raw materials failed. No. away such as cement, aggregates of low strength or uneven grading standard, impurity content, such as transfinite. Second, when mixing the concrete measures are not allowed to change the mix design. (2)The construction of paving concrete slabs less than the design value of strengthSo far, domestic Cement Concrete Pavement Technology improper construction of the main manual and mechanical paver paving methods. Two construction methods of this difference on the vibration process, and impact strength of the concrete slab is mainly due to the vibration process paver. Artificial surface of the vibrated concrete paving process is usually inserted manually using vibrated vibrated point。 At the same time to prevent concrete segregation. 4 To deal with cracks 160
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