Experimental Research On Strength Inspection Techniques Of High Strength Concrete

With the development of civil engineering , the number of high-rise buildings and long-span bridges increased, high strength concrete is used more and more widely in many fields. And also , in practice , with the improving of quality supervision and control, non-destructive examination is used widely and take an important part. However, the widely used techniques of in site, are suitable to concrete which strength is lower than 60Mpa, when strength is higher than 60Mpa, the techniques of now are helpless. Recently, the inspective means of HSC drop behind the collocation techniques and engineering development severely. So, we can see, with the development of engineering practice, how to inspect concrete quality is a significant matter which all engineers have to face to.Base on these and the features of HSC, the inspective methods of HSC are analyzed combined with engineering practice in this article. At the same time, many trials are carried ,the simples of C40, C50, C6,C70,C80 of HSC are made, and are cured to 1d, 3d, 7d, 14d, 30d, 60d, 90d, 180d, 360 and 730d. The methods of rebound, ultrasonic and rebound, extraction and penetration are applied, and about 4500 datum are obtained.Through datum regression analysis and comparing, the HSC strength curve of Hebei province is established, and as a reference to national HSC curve. But the HSC strength curve is expected to be used into real projects to be verified and corrected, in order to improve the precision of strength estimation.