International Journal of Advanced and Applied Sciences

Int. j. adv. appl. sci.

EISSN: 2313-3724

Print ISSN: 2313-626X

Volume 4, Issue 10  (October 2017), Pages:  139-143

Original Research Paper

Title: Strength quality control for ready mixed concrete

Author(s): Mustapha Boukendakdji *

Affiliation(s):

Department of Civil Engineering, College of Engineering, University of Hail, Hail, Saudi Arabia

https://doi.org/10.21833/ijaas.2017.010.019

Full Text - PDF          XML

Abstract:

The construction sector in Saudi Arabia has grown substantially in the past three decades. It is expected that the demand on concrete will increase by 10% by 2019. The compressive strength is considered to be the most important property and it is used as an indicator to check the quality of concrete and to judge compliance with specifications. The main aim of this research is to contribute to the quality evaluation of concrete construction in the region of Hail Saudi Arabia. In this study, a statistical compressive strength, using 180 test samples after 7 and 28 days taken from different concrete constructions in the city of Hail, is analyzed using the normal distribution and control chart. For each mix, a comparison of the average value of compressive strength, standard deviations and coefficient of variation (C.V.) is made. In addition a control chart of each mix is plotted with the upper and lower limit. The results showed that, apart from two mixes, the quality ranged from good to excellent with a coefficient of variance ranging from 4.13 % to 14.74 %. The results of compressive strength are within the upper and lower limits and no single test falls below the specified strength for all mixes. For all mixes the required average strength is 3.0 standard deviations above the specified strength, resulting in over-designed and uneconomical mixes. 

© 2017 The Authors. Published by IASE.

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

Keywords: Quality concrete, Variability, Compressive strength, Normal distribution, Control chart

Article History: Received 22 March 2017, Received in revised form 29 August 2017, Accepted 2 September 2017

Digital Object Identifier: 

https://doi.org/10.21833/ijaas.2017.010.019

Citation:

Boukendakdji M (2017). Strength quality control for ready mixed concrete. International Journal of Advanced and Applied Sciences, 4(10): 139-143

Permanent Link:

http://www.science-gate.com/IJAAS/V4I10/Boukendakdji.html

References (9)

  1. ACI (2002). ACI Committee 201: Guide to durable concrete (ACI 201.2R-92). American Concrete Institute. Farmington Hills, USA. 
  2. ACI (2005). ACI Committee 318: Building code requirements for structural concrete and commentary. American Concrete Institute, Farmington Hills, USA. 
  3. ACI (2011). ACI Committee 214: Guide to evaluation of strength test results of concrete (ACI 214R-11). American Concrete Institute, Farmington Hills, USA. 
  4. Al-Amoudi OSB, Maslehuddin M, and Zafar RU (1993). Permeability of Concrete: Influential Factors. In the Conference of 4th International Conference on Deterioration and Repair of Reinforced Concrete in the Arabian Gulf, Bahrain: 717-733. 
  5. CEB-FIP (1990). Applications of high performance concrete (Bulletin d'Information No. 222). Comité Euro-International du Béton-Fédération Internationale de la Précontraint. Lausanne, Switzerlaand. 
  6. Mamlouk MS and Zaniewski JP (2011). Materials for civil and construction engineers. Prentice Hall, Upper Saddle River, USA. 
  7. Mehta PK and Monteiro PJM (2006). Concrete: microstructure, properties, and materials. McGraw-Hill, New York, USA. 
  8. Mindess S, Young JF, and Darwin D (2003). Concrete. Pearson Education, Upper Saddle River, USA. 
  9. Neville AM (2012). Properties of concrete. Prentice Hall, Pearson, San Francisco, USA.