11 / 2017-11-10 11:44:59

Study on Damage Evolution Law of Shotcrete Under Coastal Environment

Shotcrete, seawater corrosion, strength, dynamic elastic modulus, damage

In order to study the damage of shotcrete caused by seawater eroded in coastal environment, artificial seawater corrosion test was carried out on shotcrete with different mixture ratio. The influence of cement dosage, water-cement ratio, sand ratio, content of fly ash and accelerator dosage on the mechanical properties of Shotcrete before and after corrosion was analyzed, and the optimum blending ratio was determined. The results show that the strength and dynamic elastic modulus of non-corrosive shotcrete are positively correlated with the amount of cement, negatively correlated with the sand rate. With the increase of the amount of fly ash, the strength and dynamic elastic modulus of shotcrete first increased and then decreased. The durability of shotcrete is positively correlated with the amount of cement, negatively correlated with the water-cement ratio, sand ratio and the accelerator dosage. With the increase of fly ash, the durability of shotcrete first increases and then decreases. The best blending ratio is 450kg / m3 for cement, 0.45 for water-cement ratio, 45% sand rate, 3% accelerator, 20% fly ash and 0.8% Water Reducing Agent.