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A study on dynamic modulus of self-consolidating rubberized concrete
Mehmet Emiroğlu,Servet Yildiz,M. Halidun Keleştemur 사단법인 한국계산역학회 2015 Computers and Concrete, An International Journal Vol.15 No.5
In this study, dynamic modulus of elasticity of self-consolidating rubberized concrete is evaluated by using results of ultrasonic pulse velocity and resonance frequency tests. Additionally, correlation between dynamic modulus of elasticity and compressive strength results is compared. For evaluating the dynamic modulus of elasticity of self-consolidating rubberized concrete, prismatic specimens having 100 x 100 x 500 mm dimensions are prepared. Dynamic modulus of elasticity values obtained by non-destructive measurements techniques are well agreed with those given in the literature.
Bond behavior of lightweight concretes containing coated pumice aggregate: hinged beam approach
Ahmet Beycioğlu,Mehmet E. Arslan,Özlem S. Bideci,Alper Bideci,Mehmet Emiroğlu 사단법인 한국계산역학회 2015 Computers and Concrete, An International Journal Vol.16 No.6
This paper presents an experimental study for determining the bond performance of lightweight concretes produced using pumice aggregate coated with colemanite-cement paste. For this purpose, eight hinged beam specimens were produced with four different concrete mixtures. 14 mm deformed bars with 10Ф development lengths were selected constant for all test specimens. All the specimens were tested in bending and load-slip values were measured experimentally to determine the effect of colemanite-cement coated pumice aggregate on bond performances of lightweight concretes. Test results showed that, colemanite-cement coated pumice aggregate increases compressive strength and bond performance of the lightweight concretes, considerably.
Ahmet Beycioğlu,Mehmet Emiroğlu,Yilmaz Kocak,Serkan Subaşı 사단법인 한국계산역학회 2015 Computers and Concrete, An International Journal Vol.15 No.1
In this paper, Artificial Neural Networks (ANN) and Multiple Linear Regression (MLR) models were discussed to determine the compressive strength of clinker mortars cured for 1, 2, 7 and 28 days. In the experimental stage, 1288 mortar samples were produced from 322 different clinker specimens and compressive strength tests were performed on these samples. Chemical properties of the clinker samples were also determined. In the modeling stage, these experimental results were used to construct the models. In the models tricalcium silicate (C3S), dicalcium silicate (C2S), tricalcium aluminate (C3A), tetracalcium alumina ferrite (C4AF), blaine values, specific gravity and age of samples were used as inputs and the compressive strength of clinker samples was used as output. The approximate reasoning ability of the models compared using some statistical parameters. As a result, ANN has shown satisfying relation with experimental results and suggests an alternative approach to evaluate compressive strength estimation of clinker mortars using related inputs. Furthermore MLR model showed a poor ability to predict.