| High performance ferrocement technology is a new method to reinforce the concrete structure, which uses a kind of high performance composite mortar and reinforcing steel bar mesh to repair and strengthen the RC structure. The latest studies prove that this technology is an efficient method to reinforce RC structure, which can obviously increase the load-bearing capacity, stiffness and crack-resisting behavior, so it will be applied widely in construction reinforcement industry. But the question is that a debonding failure occurres between the new repairing layer and the old concrete, which causes failure of reinforcement. So the bonding quality of new repairing layer to old concrete interface is still the key to this kind of reinforcement work. The research on bonding quality of adhesion between composite mortar and concrete is of important theoretical and profound significance.Firstly, the two-sided shearing experiments were carried out. The influence regularities of the main factors on the shear property were discussed, such as the surface roughness of old concrete, interface agent, strength of concrete and the composite mortar. The effect degree of each factor and their interactive effect were analysed using double factors variance analysis. Based on the test results and analysis, the optimized combination of factors was given. The shearing strength formula was fitted by Table Curve 3D, which can provide reference for design.Secondly, the experimental research on planting bars in the composite mortar was made to study the bond-anchorage properties between reinforcing bars and composite mortar. The influence of these main factors, such as the diameter of the bars, the anchorage depth and the strength of the composite mortar, made on the ultimate load carring capacity were discussed. The effect degree of every factor was analysed by variance analysis. The relationship between the diameter, the anchorage depth, the strength of the composite mortar and the ultimate drawing force was fitted by Table Curve 3D, Which had a good agreement with the test result. The formula of anchorage depth was deduced to provide reference for design and construction.Thirdly, the experimental research on planting bars in concrete was made to study the bond-anchorage properties between reinforcing bars and concrete. The influence of the diameter of the bars and the anchorage depth made on the ultimate load carring capacity were discussed. The recommended values of anchorage depth were given for construction applied. The relationship between the diameter, the anchorage depth and the ultimate drawing force was fitted by Table Curve 3D,Which had a good agreement with the test result.Finally, based on the latest and related codes, combining with a successful project reinforced by high performance ferrocement technology, the proper construction technology and the system method of controlling and inspecting the construction quality of the high performance ferrocement technology were provided, which made contribution to the enhancement of construction quality and the wide use of the technology. |
