Is China United Concrete a state-owned enterprise?

Yes.

According to (Aiqicha) inquiry, Zoomlion Concrete is a state-owned enterprise. Nanjing Zoomlion Concrete Co., Ltd. was established on February 28, 2012, and its registered address is at Dongqi Road, Dongshan Street, Jiangning District, Nanjing City No. 6, the legal representative is Bi Keliang. China United Concrete is the core enterprise of China United Cement Holdings, a subsidiary of China National Building Materials Group, a large state-owned enterprise managed by the State-owned Assets Supervision and Administration Commission of the State Council. It specializes in the production of ready-mixed concrete, dry mortar, and wet mortar.