Effect of Tunnel Debris on Concrete Durability

Tunnel debris used as coarse aggregate in concrete can reduce the amount of disposal effectively. And can ease the insufficient sand and stone. This study compared the effects of coarse aggregate on the durability of concrete from gneiss and limestone scrap. (1) C50 concrete prepared from gneiss gravel and limestone gravel has no significant difference in its antifreeze properties. That is, the lithology of the coarse aggregate does not affect the frost resistance of the concrete. (2) Concrete prepared from gneiss gravel and limestone gravel has no significant difference in the corrosion resistance of chloride ions. That is, the lithology of the coarse aggregate does not affect the corrosion resistance of the concrete. (3) Concrete prepared from gneiss gravel and from limestone gravel have little relationship with the crushing value of coarse aggregate, when the antifreeze properties and corrosion resistance of chloride ions are studied.