Author/Authors :
Karakoç، M.B. نويسنده n?nü University, Faculty of Engineering, Department of Civil Engineering, Malatya, 44280, Turkey , , Demirboga، R. نويسنده University Putra Malaysia, Faculty of Engineering, Housing Research Center, 43400, Malaysia , Atatürk University, Faculty of Engineering, Department o , , Türkmen، I. نويسنده n?nü University, Faculty of Engineering, Department of Civil Engineering, Malatya, 44280, Turkey , , Can، .I نويسنده Atatürk University, Faculty of Engineering, Department of Civil Engineering, Erzurum, 25240, Turkey ,
Abstract :
This paper describes a laboratory investigation of the resistance to freezing and thawing of
Expanded Perlite Aggregate (EPA) concrete, compared with that of natural aggregate concrete. The effects
of EPA ratios on High Strength Concrete (HSC) properties were studied for 28 days. EPA replacements of
fine aggregate (02 mm) were used: 10%, 20% and 30%. The properties examined included compressive
strength, Ultrasound Pulse Velocity (UPV), porosity, microstructure and the Relative Dynamic Modulus
of Elasticity (RDME) of HSC. Results showed that the compressive strength, UPV and RDME of samples
were decreased with an increase in EPA ratios. Test results revealed that HSC was still durable after
100, 200 and 300 cycles of freezing and thawing in accordance with the ASTM C666. After 300 cycles,
reduction in compressive strength and RDME ranged from 7% to 29% and 5% to 21%, respectively. In
this paper, feed-forward Artificial Neural Network (ANNs) techniques were used to model the relative
change in compressive strength and UPV in cyclic thermal loading. Genetic algorithms were applied in
order to determine optimum mix proportions subjected to 300 thermal cycling. The best performance
was obtained from HSC with about 10% EPA.
