公开(公告)号：US06200678B1

公开(公告)日：2001-03-13

申请号：US08470415

申请日：1995-06-06

申请人： Frederick F. Hunt ,  Donald J. Gillette

发明人： Frederick F. Hunt ,  Donald J. Gillette

IPC分类号： E04C500

CPC分类号： E04C5/08 ,  D07B1/0693 ,  D07B2201/2044 ,  D07B2201/2087 ,  D07B2201/2092 ,  D07B2205/206 ,  D07B2207/4068 ,  D07B2501/2023 ,  E04C5/015 ,  Y10T428/2925 ,  Y10T428/2927 ,  Y10T428/2936 ,  Y10T428/294 ,  Y10T428/2942 ,  D07B2801/60 ,  D07B2801/22 ,  D07B2801/18

摘要： Concrete strengthening members, particularly prestressing tendons such as strands of steel wire, are provided with a strongly adherent plastic coating which may be substantially impermeable for improved corrosion resistance, and/or which may have embedded therein abrasive or grit-form particles to provide improved bond with the concrete, and particularly to provide controllable bond transfer in prestressing tendons of the pre-tensioned type. The plastic coating preferably is applied electrostatically in powder form, and fusion bonded by heat. The abrasive can be applied by spraying during a viscous state of the heated resin, and can be varied as to size and spacing density so as to control the surface condition and the bonding effect. Fusion and curing heat may come from preheating of the member before application of the resin powder, which preferably is a heat curable, thermosetting epoxy. Coating thickness and grit application are readily variable to meet particular requirements. Particularly advantageous results are achievable for high strength steel strands for prestressing concrete by pretensioning, facilitating their use where previously considered impractical or impossible.

摘要翻译： 混凝土加固件，特别是预应力钢筋，例如钢丝股线，设置有强粘附的塑料涂层，其可以基本上不可渗透以提高耐腐蚀性，和/或可以嵌入磨料或砂粒形式的颗粒以提供改进的粘结 并且特别是在预张紧类型的预应力筋中提供可控的粘结传递。 塑料涂层优选以粉末形式静电施加，并通过加热熔合。 研磨剂可以在加热树脂的粘性状态下通过喷雾施加，并且可以根据尺寸和间隔密度而变化，从而控制表面状态和粘合效果。 在施加树脂粉末之前，熔融和固化热可以来自该部件的预加热，其优选是可热固化的热固性环氧树脂。 涂层厚度和砂粒应用是容易变化的，以满足特定要求。 对于预应力预应力混凝土的高强度钢绞线来说，可以实现特别有利的结果，便于在以前认为不切实际或不可能的情况下使用混凝土。