Muthanna Journal of Engineering and Technology
Volume (5), Issue (3), Year (30 December 2017), Pages (57-66)
DOI:10.52113/3/eng/mjet/2017-05-03/57-66
Research Article By:
Khalid Zakaria, Rabi Muyad Najem and Salwa Mubarak
Corresponding author E-mail: ce_rabi@yahoo.com
ABSTRACT
This research aims at the evaluation of concrete compressive strength by non destructive testing techniques namely, the maturity concept test in addition to the hammer (rebound), and the ultrasonic scan tests. A comparison of results is then to be conducted to estimate the accuracy of the method. The real ability and the introduction of the maturity concept test is the main focus of this work since it takes into consideration the combined effect of temperature and age on the mechanical properties of concrete, as well as the interaction between site and laboratory testing . A total number of 14 cylinders and a square slab of 900 x 900 x 70 mm of the same mix were tested for the maturity strength relationship with heat sensors imbedded into the specimens slab and two additional cylinders also at the age of 56 days the same concrete was tested by the hammer and ultrasonic scan, the results showed good agreement giving a compressive strength of 32.2 MPa, 28.0 MPa and 29.7 MPa for the maturity, ultrasonic and hammer tests respectively.
Keywords: Concrete, maturity concept, non destructive testing.