NDT of LWC with expanded clay

Abstract

Nowadays, light-weight concrete (LWC) is increasingly used in construction, namely lwc with aggregates of expanded clay type called Liapor. It is often necessary to perform tests for the characteristics of cast-in-place concrete during building construction as well as after the construction. One of the ways to control the quality of LWC in a structure is using non-destructive testing (NDT) methods. For com-pressive strength, there are reflective rebound methods and ultrasonic pulse method (UPM) which may also be used for determination of dynamic modulus of elasticity. This paper presents the results of NDT of LWC with expanded clay using above the mentioned methods and as well as the associated calibration relations. A comparison of conversion coefficients obtained from modulus of elasticity tests on normal-weight concrete (NWC) and LWC is also provided. The developed calibration relations resulted in a high degree of correlation between the NDT results and the results of compression tests on concrete specimens. © RILEM 2013.