钢筋混凝土构件是建筑质量的根本,混凝土质量的优劣直接影响建筑物的安全和使用年限。有些工地混凝土实际强度低于设计标号,造成有的工程倒塌,有的返工,有的给建筑留下隐患:如某县茶场单层烘干厂房,跨度为11.63米的钢筋混凝土梁; Reinforced concrete components are fundamental to building quality. The quality of concrete directly affects the safety and age of buildings. The actual strength of some concrete sites was lower than the design number, resulting in the collapse of some of the works, some rework, and some left hidden dangers to the buildings: such as a single-storey drying plant in a county tea plant, a reinforced concrete beam with a span of 11.63 meters;