Arabi N.S. Al  Qadi, Hashem  AL-Mattarneh, Kamal Nasharuddin  Mustapha, Qahir N.S.  AL-Kadi, 
    Central Composite Design Models for Workability and Strength of Self-Compacting Concrete,
    Journal of Engineering and Applied Sciences,
    Volume 4,Issue 3,
    2009,
    Pages 177-183,
    ISSN 1816-949x,
    jeasci.2009.177.183,
    (https://makhillpublications.co/view-article.php?doi=jeasci.2009.177.183)
    Abstract: A central composite design models was carried out to model the influence of key mixture parameter on fresh and hardened properties affecting the performance of Self-Compacting Concrete (SCC). Such responses included slump flow as a filing ability, L-Box as a passing ability and sieve analysis as resistance to segregation. Thirty-one mixtures were prepared to derive the numerical models and evaluate the accuracy. The models are valid for a wide range of mixture proportioning. The study presents, the derived numerical models that can be useful to reduce the test procedures and trials needed for the proportioning of self-compacting concrete. The qualities of these models were evaluated based on several factors such as level prediction, residual error, residual mean square and correlation coefficients.
    Keywords: numerical models;design model;self-compacting concrete;statistical models;Workability;strength