Concrete: refers to the general name of engineering composite materials in which aggregates are bonded into a whole by cementing materials. Generally speaking, the term concrete refers to cement as cementing material and sandstone as aggregate; Cement concrete, also known as ordinary concrete, is made of water (which can contain additives and admixtures) in a certain proportion and is widely used in civil engineering.
Circular pipe culvert? The most commonly used culvert structure in rural highway subgrade drainage not only has good mechanical properties, but also has simple structure, convenient construction, short construction period and low cost. Reinforced concrete circular culvert is the most common one. Circular pipe culvert consists of two parts: the hole body and the mouth of the cave. The tunnel body is the main body of the water passage, which is mainly composed of pipe body, foundation and joint. The entrance of the cave is the connection part of the tunnel body, subgrade and water flow, which mainly has two forms: splayed wall and straight wall.