2.8　Quality Control

2.8.1　Requirement for deviation of track slab overall dimension

Refer to Table 7 for the requirement for deviation of track slab overall dimension.

Table 7　Requirement List for Deviation of Track Slab Overall Dimension

2.8.2　Requirement for appearance quality of track slab Refer to Table 8 for requirement for appearance quality of track slab.

Table 8　Requirement List for Appearance Quality of Track Slab

continued

2.8.3　Other quality requirements

1.The compressive strength of concrete shall not be lower than design strength，and the elasticity modulus shall not be lower than design value.

2.The pulling resistance of embedded sleeve shall not be less than 60 kN，there shall be no visible crack around after testing，but little mortar peeling is allowed.

3.The insulation performance of track slab shall comply with the technical requirement for track circuit.

4.The grounding terminal of track slab，as well as the position，quantity and welding joint length of grounding rebar shall comply with design requirement.