Application Of Rebound Drilling Core Method In Strength Estimation Of Existing Concrete Structures

Nondestructive testing technology is based on the modern science and technology based on an application of technical disciplines,it does not damage the internal structure of the object being detected as the premise,the application of physical methods to detect the internal or surface physical properties,state characteristics and internal structure,To check whether there is a discontinuity within the material(ie,defects),to determine whether the object is qualified,and then evaluate its applicability.As more and more concrete building structures meet the design life and more stringent on the quality of new concrete projects,there is an urgent need for a non-destructive and efficient detection method for existing structural concrete.In this paper,a non-destructive testing method of spring-back-core integrated detection method is proposed,which uses the rebound method to detect the continuous and comprehensive The advantages and disadvantages of the method are as follows: the detection range and continuity of the structure to be tested are ensured by the spring-back method.The method has the advantages of high precision and low precision,Combined with the core method to ensure the accuracy of the test results,a good play to the advantages of both,so is a so far more ideal for non-destructive testing.In this paper,through a project example,in the known engineering under the premise of the strength of the concrete level,in accordance with the relevant norms of the physical engineering implementation of the rebound-drilling method to detect a comprehensive method,through a large number of data samples,combined with a number of related factors :(1).Rebound core drilling method integrates the rebound method and core drilling method has the advantages,weaknesses,the test results can be found that the comprehensive method can well reflect the real situation of the concrete strength is detected,with high reliability,is a kind of effective method for nondestructive testing of concrete.(2).For concrete with a design strength grade of not less than C40,the estimated value of the resilience of the concrete is estimated to be the value of the concrete with the core value of the core,and the minimum value of the rebound is measured by the rebound method.Comprehensive strength values are basically the same;for the design strength level is lower than the C40 concrete,the rebound value is low,so thegeneral should be based on its core sampling comprehensive strength value shall prevail.And further put forward some suggestions to improve the rebound-drilling method of the integrated method,so that the accuracy of the method to further improve.