EFFECT OF ASPECT RATIO ON THE FREEZING-THAWING OF A CH CLAY

Year 2019, Volume: 7 Issue: 1, 66 - 74, 01.03.2019

Rahim Kağan Akbulut Ahmet Şahin Zaimoğlu

https://doi.org/10.15317/Scitech.2019.182

Abstract

The
geotechnical properties of fine grained soils which depends on the variation of
aspect ratio (ξ=length/diameter) exposed to freezing-thawing is not known
clearly. The effect of aspect ratio on unconfined compression strength and
freezing-thawing resistance of fine grained soils after 0, 5, 10, and 20
freezing-thawing cycles have been investigated in this study. The
freezing-thawing test was conducted in an automatic freezing-thawing cabinet,
the freezing and thawing temperatures of which were selected as -20°C and
+25°C, respectively. The unconfined compression test was conducted in an
unconfined compression testing apparatus, the loading ratio of which was 0.8
mm/min. These values were held constant throughout the test. Tests were
conducted on cylindrical samples with different ξ (length/diameter) ratios
prepared at standard Proctor energy. The test results indicated that, as ξ
ratio decrease and the number of freezing-thawing cycles increase, unconfined
compression strength decrease and freezing-thawing grain loss increase.

Keywords

Aspect ratio, CH clay, Freezing-thawing, Unconfined compression strength

Numune Boyutunun CH Kilinin Donma-Çözülme Üzerindeki Etkisi

Abstract

Donma-çözülmeye
maruz zeminlerin davranışı numune boyutuna (ξ=boy/çap) bağlı
olarak nasıl değişeceği tam olarak bilinmemektedir. Bu çalışmada numune
boyutunun ince daneli zeminlerde 0, 5, 10 ve 20 donma-çözülme çevrim sonrası
serbest basınç mukavemeti ve donma-çözülme dayanımı üzerindeki etkisi
araştırılmıştır. Donma-çözülme deneyi donma sıcaklığı -20^oC çözülme
sıcaklığı +25^oC olan otomatik donma-çözülme kabininde, serbest
basınç deneyi yükleme hızı 0.8 mm/dk olan serbest basınç deney aletinde
yapılmıştır. Bu değerler deney sırasında sabit tutulmuştur. Deneyler standart
proktor enerjisinde hazırlanmış farklı ξ (boy/çap)
oranlarına sahip silindirik numuneler üzerinde yürütülmüştür. Deney
sonuçlarından numunelerin ρ oranı ve donma-çözülme çevrim sayısının artmasıyla
serbest basınç mukavemeti ile donma-çözülme dayanıklılığının azaldığı
belirlenmiştir.

Keywords

Boy/çap oranı, CH kil, Donma-çözülme, Serbest basınç dayanımı

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