In order to reduce the cost and increase the RPC strength, the substitution of mixed minerals such as ultra-pulverized fly ash for silica fume quantity can be lower than 20%.

• 为降低成本而又不大幅度损害活性粉末混凝土的强度，超细粉煤灰等矿物掺合料替代硅灰的量不宜超过加20%25。