Preparation method of highway viaduct pier sheath concrete

The invention discloses a preparation method of highway viaduct pier protective layer concrete, and belongs to the technical field of concrete production.The preparation method comprises the steps that hole-filling film-covering gravel coarse aggregate, hole-filling film-covering natural river sand fine aggregate and a coconut fiber reinforcing agent are prepared; the concrete is prepared by compounding and mixing the following components in parts by weight: 800-1000 parts of hole-filling coated gravel coarse aggregate, 400-550 parts of hole-filling coated natural river sand fine aggregate, 350-450 parts of cement, 5-20 parts of coconut fiber reinforcing agent, 10-20 parts of titanium dioxide weather-resistant agent, 5-15 parts of slump-resistant agent, 10-50 parts of expansion inhibition complexing agent, 5-20 parts of sodium metaaluminate accelerator, 10-20 parts of carbonyl pyroaldehyde water reducing agent, 5-20 parts of air entraining agent and 80-160 parts of water. The concrete prepared by the preparat