Study on Concrete Optimization and Cracking Performance of CRTS Ⅲ Slab Ballastless Track Structure Base
For the optimization and cracking performance of the base concrete of CRTS Ⅲ slab ballastless track structure,through the experimental analysis of working performance,mechanical properties and volume stability,it is concluded that the influence of different slumps on the compressive strength,plastic shrinkage and dry shrinkage of concrete is almost negligible.However,during the construction,the slump affects the bleeding layer of the base concrete,so the slump of the concrete should be reduced as much as possible.The increase of TK-ac type shrinkage-reducing and anti-cracking agent will increase the plastic shrinkage deformation of concrete and reduce the dry shrinkage deformation.Therefore,after adding TK-ac type shrinkage-reducing and anti-cracking agent,it is necessary to do a good job in early moisturizing maintenance,reduce the amount of cementitious materials and water consumption,so as to reduce the early plastic shrinkage of concrete and improve the crack resistance of concrete.
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