超效缓凝砂浆与缓粘结预应力混凝土构件试验研究

EXPERIMENTAL RESEARCH ON SUPER-RETARD-SETTTING MORTAR AND RETARD-BONDED PRESTRESSED CONCRETE BEAMS

配制出了能满足缓粘结预应力体系要求的超效缓凝砂浆,通过手工方式制成了缓粘结预应力筋并进行了模拟工艺试验,证明了这一新型预应力体系的可行性;同时,用这种预应力筋浇制成了16根缓粘结预应力受弯构件,对这些构件进行了试验,从开裂弯矩、极限弯矩、裂缝形式和荷载-挠度曲线等各个方面,把缓粘结预应力构件与传统的后张法(有粘结无粘结)预应力构件进行了对比分析,得出了缓粘结预应力构件在张拉两个月后,其工作性能与有粘结预应力构件几乎一样的结论,为这一新型预应力体系的工程设计提供了依据。

A kind of super-retard-setting mortar is studied and tested in the paper. It is used for the retard-bonded prestressed concrete system. A retard-bonded prestressed strand is made by manual work and the experiment has been done that imitate the technology. The prestressed concrete beams placed retard-setting material between the concrete and the prestressed strand are made and tested. The conclusion is obtained that the performance of the prestressed concrete beam is almost the same as the traditional one, which has a sticky force between the concrete and the prestressed strand. It is verified that the new technology is feasible. Some useful conclusions can be used for reference.