Utility of Non Destructive Tests to Assess the Compressive Strength of High Performance Concrete

F. Al-Khafaji, Sura; A. Al-Qaisi, Waleed; A. Al-Mishhadani, Shakir

	Utility of Non Destructive Tests to Assess the Compressive Strength of High Performance Concrete
ALNAHRAIN JOURNAL FOR ENGINEERING SCIENCES
Article 1, Volume 11, Issue 3, 2008, Pages 552-559
Authors
Sura F. Al-Khafaji; Waleed A. Al-Qaisi; Shakir A. Al-Mishhadani
Abstract
In this study, high performance concrete mixes were produced by using high range water reducing agent(Glenium 51) and also by using 10% silica fume or 10% high reactivity metakaolin as a partial replacement by weight of cement. Three cement contents (350, 450, and 550) kg/m3 were used through this study. A total of 330 (100 mm) cubes, 66 (150×300 mm) cylinders, and 132 (100×100×400 mm) prisms were cast and cured to the required age of test. Compressive strength, rebound number, ultrasonic pulse velocity and dynamic modulus of elasticity were investigated for all mixes at 7, 28, 90, and 120 days age. Results of the destructive test of compressive strength and non–destructive tests (hammer, ultrasonic pulse velocity, and dynamic modulus) are statistically analyzed by using SPSS Ver.15 software to study the possibility of assessing the compressive strength of high performance concrete by using non–destructive tests. Simple and multiple linear regression analysis of the obtained results leads to the proposed statistical models for evaluating the compressive strength by using one or two or three of the above non–destructive tests. Analysis of variance (ANOVA) and t–test was also used to investigate the adequacy of the statistical models. The statistical models were subjected to adequacy checks at a selected level of significance of 5%.

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