Identifying the bond and abrasion behavior of alkali activated concretes by central composite design method

Published Date
1 February 2017, Vol.132:196–209, doi:10.1016/j.conbuildmat.2016.10.034

Author 

• Muzeyyen Balcikanli ^a
• Hakan Tacettin Turker ^a
• Erdogan Ozbay ^a,,
• Okan Karahan ^b
• Cengiz Duran Atis ^b

• aIskenderun Technical University, Civil Engineering Department, Iskenderun, Turkey
• bErciyes University, Civil Engineering Department, Kayseri, Turkey

Received 11 July 2016. Revised 19 September 2016. Accepted 6 October 2016. Available online 8 December 2016.

Highlights

• Bond strength and abrasion resistance of alkali activated concretes (AAC) were examined experimentally by CCD method.
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  AASC were designed and produced considering the SC, SM, CT and ECT as the CCD’s independent parameters.
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  Compressive strength, split tensile strength, ultrasonic pulse velocity (UPV), abrasion and bond behavior of AAC were defined.
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  Effects of each independent parameter on the dependent parameters were statistically analyzed.
• •
  The optimum values of the parameters studied were defined as CT of 66 °C, ECT of 14.76 h, SC of 5.72% and SM of 1.0 for the defined multi-objective optimization problem.

Abstract

In this paper, bond strength and abrasion resistance of alkali activated concretes (AAC) were examined experimentally by using the central composite design (CCD) method. AAC were designed and produced considering the sodium concentration (SC), silicate modules (SM), curing temperature (CT) and exposed curing time (ECT) as the CCD’s independent parameters. Twenty-one AAC mixtures were established depend on the various combinations of independent parameters in CCD at 95% confidence level. Effects of each independent parameter on the dependent parameters were statistically analyzed using experimental measurements and best possible combination of the independent parameters were defined for the maximization of the compressive strength, split tensile strength, UPV and bond behavior of AAC and for the minimization of abrasion value of AAC by solving the multi-objective optimization problems which is generated using the proposed regression models for the dependent parameters. Test results demonstrate that all studied independent parameters have the noteworthy effect on the properties of AAC statistically; however, the most effective independent parameter is SC. The optimum values of the parameters studied were defined as CT of 66 °C, ECT of 14.76 h, SC of 5.72% and SM of 1.0 for the defined multi-objective optimization problem.

Keywords

Bond behavior

Abrasion resistance

Alkali activated concrete

Central composite design

Statistical analysis

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  Corresponding author.
  
  

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