immature concrete

例句：

1. 1. The construction of the new bridge was completed with immature concrete.
   新桥的建设使用了不成熟的混凝土。
2. 2.The engineers used a mixture of cement and water to create immature concrete for the foundation.
   工程师们使用水泥和水混合制成了不成熟的混凝土作为地基。
3. 3.The durability of the immature concrete was not as expected, leading to concerns about its long-term stability.
   这种不成熟的混凝土的耐久性没有预期的那样好，这引发了对其长期稳定性的担忧。