Since the 1990s, prestressed concrete piles (hereinafter referred to as piles) obtained in infrastructure projects in the coastal areas of the country vigorously promote the use, production technology is relatively mature, the product quality has been greatly improved. However, some inland areas of the new pile production enterprises, especially some of the northern areas of new enterprises, the occurrence of concrete pile sticky skin, hemp and other exterior surface quality problems often pile production, thus affecting the quality of the pile of products, Piles of products using the unit to bring construction quality problems, and even affect the durability of the product piles, piles of product sales but also to bring some difficulties.
   Sticky skin refers to the production of pile pressure maintenance operations, the pile outer surface of the inner wall of concrete and steel bonding, when stripping from the pile of concrete piles partial tear pile appearance is part of the cement mortar layer stick to steel, concrete pile showing the structure of the outer surface layer of uneven phenomenon. Pock refers to the outer surface of the pile after pile of concrete release presents intensive small holes, diameter generally less than 5mm, while the color of the surrounding concrete at the concrete differences Pock, pale yellow, powdery sand, and no strength.
   National Standard GB 13476-2009 "pre-tensioned prestressed concrete piles" in Section 5.4 provides that: "local sticky skin and pockmarked face cumulative total area of ​​the outer surface of the pile should not exceed 0.5% of each of the sticky surface of the leather and hemp depth of not more than 5mm, and should be repaired. " Pock sticky skin and evaluate the level of quality of pile main technical indicators.
   Combining multi-effect sticky skin, pitted surface quality accident occurred pile manufacturer, analyze the reasons for the formation of sticky skin and pockmarked face, the proposed effective treatment methods and measures that can be taken.