Pamukkale Univ Muh Bilim Derg. 2018; 24(6): 1230-1236 | DOI: 10.5505/pajes.2017.76702

Determination of reinforced dry concrete strength by electrical resistivity method

Nevbahar Sabbað, Osman Uyanýk
Süleyman Demirel University Engineering Faculty Geophysical Engineering Isparta

In this study, change of the apparent resistivity values was investigated on reinforced concrete samples designed with different strength in dry conditions. For this purpose, studies were conducted with 150x150x150 mm cubic samples of 9 different concrete designs. A piece of 10, 14 or 20 mm diameter reinforcement was placed in the middle of concrete samples and 18 samples were prepared for all types of them. Prepared these samples were subjected to the air cure. The apparent resistivity values of the samples were determined by electrical method on different surfaces of the sample at specific time periods of during the 90 days. Furthermore, the concrete strength was determined from average of 3 samples by uniaxial compressive strength test of each sample on 7th, 28th and 90th days. The time dependence change of the apparent resistivity and concrete strength values obtained from these studies was presented. In addition, the relationships between the compressive strengths and the resistivity values were determined separately for each reinforcement diameter. As a result, the apparent resistivity values decrease with increasing concrete compressive strengths in dry conditions concrete of different strengths. This research is a non-destructive approach to determining the strength of concrete in dry condition in-situ and it contributes both time and economically.

Keywords: Reinforcement, dry concrete, apparent resistivity, concrete strength, non-destructive geophysical method

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Elektrik özdirenç yöntemi ile donatýlý kuru beton dayanýmýnýn belirlenmesi

Nevbahar Sabbað, Osman Uyanýk
Süleyman Demirel Üniversitesi Mühendislik Fakültesi Jeofizik Müh. Bl. Isparta

Bu çalýþmada farklý dayanýmlara göre tasarlanmýþ donatýlý beton numunelerin kuru koþullarda görünür özdirenç deðerlerinin deðiþimi araþtýrýlmýþtýr. Bu amaçla 9 farklý beton tasarýmýna ait 150x150x150 mm boyutlarýnda küp numuneler hazýrlanmýþtýr. Beton numunelerinin tam ortasýna 10, 14 veya 20 mm çapýnda bir adet donatý yerleþtirilmiþ ve her çeþit numuneden 18 adet oluþturulmuþtur. Hazýrlanan bu numuneler hava kürüne tabi tutulmuþtur. 90 gün boyunca belirli zaman dilimlerinde numunelerin farklý yüzeylerinden elektrik yöntem uygulanarak numunelerin görünür özdirenç deðerleri belirlenmiþtir. Ayrýca 7., 28. ve 90. günlerde 3’er adet numunenin Tek Eksenli Basýnç dayanýmlarý ölçülerek ortalamalarýndan beton dayanýmý belirlenmiþtir. Yapýlan bu çalýþmalardan elde edilen görünür özdirenç ve beton dayaným deðerlerinin zamana baðlý deðiþimi ortaya konulmuþtur. Ayrýca basýnç dayanýmlarý ve görünür özdirenç deðerleri arasýndaki iliþkiler her bir donatý çapý için ayrý ayrý belirlenmiþtir. Sonuç olarak kuru koþullarda farklý dayanýmlardaki betonlarýn görünür özdirenç deðerleri beton basýnç dayanýmlarýnýn artmasýna baðlý olarak azalmaktadýr. Bu araþtýrma, kuru haldeki betonun dayanýmýnýn yerinde belirlenmesine tahribatsýz bir yaklaþým olup hem zaman hem de ekonomik açýdan katký saðlamaktadýr.

Anahtar Kelimeler: Donatý, kuru beton, görünür özdirenç, basýnç dayanýmý, tahribatsýz jeofizik yöntem

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