Abstract
Gap exists in the interface of cement asphalt emulsion mortar and CRTS I track slab universally, which is more severe at four corners than other parts of the track slab. In this work, the temperature and elevation of CRTS I slab track with and without rail were measured continuously to study the influence mechanism of rail on the gap. The results show that the alternating temperature gradient of track slab is the main reason that causes the gap, and laying rail can efficiently decrease the gap size in the slab track without rail. Compared with the slab track without rail, the maximum elevation occurred at the corner, the maximum gap width and the maximum gap depth of the slab track with rail laid were decreased by 0.45 mm (25.7%), 0.75 mm (46.6%) and 9.5 mm (59.4%), respectively; meanwhile, the disqualification ratio at corners was reduced to 5.9%, which is 50% less than that of the track without rail. When elevation mismatch occurs in adjacent track slabs, a gasket should be placed at rail-bearing bed below the track slab in order to avoid the lower slab being dragged up by the higher slab and the further occurrence of new gap.
Highlights
Gap exists in the interface of cement asphalt emulsion mortar and China railway track system I type (CRTS I) track slab universally, which is more severe at four corners than other parts of the track slab
Compared with the slab track without rail, the maximum elevation occurred at the corner, the maximum gap width and the maximum gap depth of the slab track with rail laid were decreased by 0.45 mm (25.7%), 0.75 mm (46.6%) and 9.5 mm (59.4%), respectively; the disqualification ratio at corners was reduced to 5.9%, which is 50% less than that of the track without rail
Compared with the track slab without rail, the maximum elevation at the corners of track slab with rail measured by dial gauge decreases by 0.75 mm (46.6%), the maximum width measured by feeler gauge decreases by 0.45 mm (25.7%), and the maximum depth measured by steel ruler decreases by 9.5 mm (59.4%)
Summary
After the CA mortar was grouted, temperatures in different sites were tested over 24 h during the first 2 days, and solar radiation of the first day was much stronger than that of the second day. The possible reason for this difference is that the exothermic hardening process of CA mortar reaches the highest rate 10 h later after grouted, resulting in the highest temperature at midnight. The maximum temperature difference is 11.2 °C between the atmosphere and the bottom surface of slab (i.e., the top surface of CA mortar layer), while there is a difference of 8.3 °C between the top surface and the bottom surface. The temperature at the top mortar surface is slightly higher than that at the bottom surface and the maximum difference is 2.6 °C. The alteration of day and night caused a temperature gradient between the top and bottom surfaces of the slab, resulting in curling deformation of the slab
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