1. Following is the factors ideating with the surface of old concrete in different way (including brushing surface, chiseling surface, cleaving surface), adherence agent (including cement slurry, cement sand slurry, cement slurry with the u expansion agent), the freeze - thaw circulation times and air - entraining.
主要考察了老混凝土表面不同处理方式(刷毛面，凿毛面，劈裂面)、界面粘结剂类型(水泥净浆，水泥砂浆，u型膨胀剂水泥浆)、冻融循环次数等对新老混凝土粘结面劈拉强度的影响，以及冻融作用下新混凝土加气对粘结面劈拉强度的影响。
2. Establish handling ideating of kidnap hostage event and let it turn into police's action is very necessary at present.
当前树立先进的处置理念并让其转化为警方的自觉行动是十分必要的。