预制构件是一种产品,应有外观质量的要求。并且,这不仅是一种感观要求,而是影响构件质量与性能的一个重要方面。TJ321-76标准为此规定:“……不得露筋和有响结构性能或使用的蜂窝、麻面和裂缝。”但是,限于当时条件,该标准没有对这些缺陷给出确切的定义,也没有规定相应的检查方法。长期以来,预制构件厂普遍不重视构 The prefabricated component is a product and should have the appearance quality requirements. And, this is not only a sensory requirement, but an important aspect that affects the quality and performance of components. The TJ321-76 standard specifies for this: “...there must not be exposed ribs and structural properties or honeycombs, flanks and cracks used.” However, limited to the prevailing conditions, the standard does not give a precise definition of these defects, nor Specify the appropriate inspection method. For a long time, prefabricated component factories generally do not pay attention to