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Effect Of Water Trap On Fall-Cone Behavıour Of A Soıl 2019-09-12

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Olgaç Sürmelihindi

Çevre ve İnşaat Mühendisi
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11 Şub 2013
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ÇİMKO ÇİMENTO VE BETON SAN. TİC. A.Ş.
Olgaç Sürmelihindi isimli kullanıcı yeni bir makale oluşturdu:

Arkadaşlar merhaba, yapmakta olduğum yüksek lisans tez konusu çalışması ile ilgili makale yayımlanmış olup, özet bilgileri aşağıda yer almaktadır. Çalışmalarda kil malzemesi ve su tutucu malzemenin karıştırılarak etkileri ve davranışları incelenmiştir.

ABSTRACT
Clayey soils are known as problematic soils in engineering designs due to their low bearing capacity, high compressibility and low permeability. Many researchers have conducted experimental research on improving these soils. This study presents an experimental study on the improvement of a clay using a water trap substance. This additive was added mixed with clay at the ratios of 0%,1.0% and 1.5%. A series of fall-cone tests was carried out. The results showed that the liquid limit of clay was increased by the additive Besides, the fall-penetration values of the clay were found to decrease.

Keywords: Clay, water trap substance, fall-cone

ÖZET Killi zeminler düşük taşıma gücü, yüksek sıkışma düşük geçirimlilik gibi özelliklerinden dolayı mühendislik tasarımlarında problemli zeminler olarak tanınmaktadır. Birçok araştırmacı killi zeminlerin iyileştirilmesi üzerine deneysel araştırmalar yapmıştır. Sunulan çalışma killi zeminlerin bir su tutucu malzeme ile iyileştirilmesi üzerine gerçekleştirilen deneysel bir çalışmayı sunmaktadır. Bu su tutucu malzeme zemine kuru ağırlıkça %0, %1.0 ve %1.5 oranlarında eklenmiştir. Oluşturulan karışımlarda düşen koni deneyleri uygulanmıştır. Elde edilen sonuçların zeminin su tutucu malzeme ilaveleri ile likit limitinin arttığını göstermektedir. Bunun yanında zeminin penetrasyon değerleri de azalma göstermiştir.

Anahtar Kelimeler: Kil, su tutucu malzeme, düşen koni.

1. INTRODUCTION Many studies have focused on improving geotechnical properties of clays. The researchers studied to improve the low bearing capacity, high compressibility and high swelling potential of clays. Some studies have attempted to improve the clay with another material including cement (Mousavi and Wong, 2015), fly ash (Kolay and Ramesh, 2016), lime (Ghobadi et al., 2014), coal waste (Modarres and Nosoudy 2015). For example, Ghobadi et al. (2014) mixed clay with lime. In the study carried by Ghobadi et. al. (2014), unconfined compression test (UCS) and direct shear test tests were performed on lime-clay mixtures. The researchers concluded that the lime additions increased the UCS value of the clay and reduced the maximum dry density. Furthermore, Kolay and Ramesh (2016) used sand and fly ash to improve two types of clays (bentonite and kaolin). Their results indicated that the geotechnical properties of clay including consistency limits, compaction, compressibility are improved with the sand and flay ash. The fall-cone test is a widely preferred test because it allows to estimate liquid limit and undrained shear strength (su) values. In the fall-cone test, the liquid limit is considered to be the water content corresponding to the 20 mm fall-cone penetration. The su value from the fall-cone test is obtained by equation 1

1568289854850.png

where k is a constant which is 0.85 for 30˚ British cone, and w is weight of the cone used. Many researchers have estimated the liquid limit (Cabalar and Mustafa, 2015), plastic limit (Feng, 2000), su (Park et al., 2018) using the fall-cone tests. For example, Zhang et al. (2018) found the liquid limit, plastic limit and su values of clay-lignin mixtures using fall-cone test. In this study a water trap substance was added to a clay with mixture ratio at 0%, 1% and 1.5%. A series of fall-cone tests were performed to these mixtures.

2.MATERIALS AND METHOD
In this study, a clay and a water trap substance was employed during experimental study. The clay samples were obtained from the University of Gaziantep campus. According to the results obtained from the fall-cone tests, the liquid limit of clay was found to be 31.69%. The scanning electron micrograph (SEM) picture of the clay are given in Figure 1. The most important property of the water trap substance, which used in agricultural works, is water absorption capacity.
The BS-1377 standard was followed in fall-cone tests. The fall-penetration time is five seconds as indicated by the BS 1377.

1568289909515.png

3. RESULTS AND DISCUSSIONS
Fall-cone penetration-water content relationship obtained from the fall-cone test is given in Figure 2. Fall-cone penetration values decreased as the water content of the mixture increased. In addition, fall-cone penetration values decreased with the water trap substance (WT) additions at a given water content. For example, the fall-cone penetration values of clean clay and clay with 1% the WT are 25 and 15.5, respectively at a 36% water content of mixtures. Figure 3 presents the liquid limit values obtained from the fall-cone experiment. The liquid limit of the clean clay increases with the water trap substance. For example, the liquid limit of clean clay was found to be 31.69 while it was 42.49 for clay with 1.5% the WT. An increase in the liquid limit value indicates that the water trap substance increase the water absorption capacity of the clay.

1568289986091.png

4. CONCLUSIONS
The water trap substance was mixed with clay at specific proportions (0%, 1%, 1.5%). A series of fall-cone tests performed on mixtures. The experimental results indicated that the fall-cone penetration decreased with the water trap substance. In addition, the liquid limit value of the clean clay increased with the water trap substance. The main conclusion from these results is that the water trap substance increases the water absorption capacity of the clay.

Effect Of Water Trap On Fall-Cone Behavıour Of A Soıl - Kil ve Su Tutucu Malzeme



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