Working with 混凝土
混凝土 is easy to work with, versatile, durable, and economical. By observing a few basic precautions, it is also safe-one of the safest building materials known. 在过去的几年里, relatively few people involved in mixing, 处理, and finishing concrete have experienced injury. Outlined below are some simple suggestions-protection, 预防, common sense precautions-useful to anyone working with portland 水泥 and concrete.