Experimental Research on the Shearing Property of Interfacial Bonding of New to Old Concrete by Cutting Groove
|Keywords||young on old concrete cutting groove shear strength roughness BP model|
The repair and strengthening of concrete structure has become an important engineering domain. The enlarging section method is widely applied in the repair and strengthening of concrete structure. Therefore, the research of adherence of young and old concrete has profound significance. Shear strength of concrete is one of the basic mechanics performances of concrete; the interfacial treating of new to old concrete is the first and the key step of adherence of young and old concrete. In this paper, shearing test on cube specimens with cutting groove bonding has been carried out by using self-made shearing equipment, and the theoretical analysis is also made. The main results are summarized as follows:1 、The development and the use in fact of adhesive structure of new to old concrete are expounded. The main research contents are introduced.2、 Various shearing equipments are analyzed by using the soft of ANSYS 8.0. Shearing test on 15 cube specimens of 5-force-grade is made using the self-made shearing equipment. As a result, the experimental date of this paper is useful.3 、The mechanism of adherence of young concrete to the old is given.4、 The treating methods for the interfacial roughness of new to old concrete are summarized, and the advantages of cutting groove method are given.5、 Shearing tests on 138 cube specimens of new to old concrete with cutting groove are carried out; and the effect of different roughness、 the type of young concrete and adhesion agent are considered. The best average sand-pouring depth is attained(2.5 mm),which is useful for the project application.6、The design method of new to old concrete with cutting groove is given, and this is applied to the project strengthening.7 、The BP artificial neural network prediction model is established for forecasting the shearing strength of new to old concrete with cutting groove.