预应力混凝土用钢棒滞后断裂原因分析

Cause Analysis on Lagged Fracture of Steel Bar for Prestressed Concrete

检验与分析预应力混凝土用钢棒"滞后断裂"原因:钢棒表面有缺陷,特别是有横向微裂纹之类的缺陷。钢棒表面横向裂纹的主要原因:热轧高线盘条椭圆度过大或表面有耳子、盘条表面的局部损伤、拉拔的局部润滑不良。

The causes of lagged fracture of steel bar for prestressed concrete were tested there were some defects such as transversal micro cracks on the bar surface. The main causes cracks on the bar surface included that the ovality of high speed wire rod was too big or there were local damages on the rod surface, and local lubrication during drawing was not good. and analyzed： of transversal some fins and