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Improvement of engineering properties and liquefaction reduction of sandy soils using electric arc furnace slag and roof tile powder

Agolli, Drinela

Yüksek Lisans | 2016 | İzmir Katip Çelebi Üniversitesi Fen Bilimleri Enstitüsü

The scarcity of suitable land for construction of engineering facilities and shortage of natural earth aggregates has highlighted the need for finding innovative way of construction. Nowadays problematic soils such as: soft clay, organic soils and liquefiable soils can be improved to the required civil engineering requirements by application of soil stabilization. Soil stabilization is a method intended to increase or preserve the stability of soil mass and chemical alteration of soil to improve engineering properties. Generally, ground treatment techniques used are: densification, reinforcement, drainage and deep soil mixing. Usin . . .g soil treatement, unbound materials can stabilized with cementitious materials (lime, cement, fly ash, waste materials). Replacement of stabilizing agents with waste materials is becoming a need due to lack of natural resources and environmental concerns. Slag a by-product of metallurgical industry is being used to improve engineering properties of low bearing capacity soils. In this study, mechanical properties of non-cohesive soils are improved using waste materials. Waste material used is: electric arc furnace slag (EAF slag). Natural materials diatomite and roof tile powder are mixed too. In order to activate slag, some chemical additives were added. Firstly, cylindrical samples with different proportions were prepared. They were tested for period of 7, 21 and 28 days under unconfined compressive strength (UCS) test. The optimum mixture was tested also under 1-D shaking table subject to different earthquake records. Photogrammetric approach was used to observe behaviour of soil under dynamic load and settlement. It was seen that combination giving the highest compressive strength was mixture containing EAF slag, sand, lime and sulphuric acid (H2SO4). The highest compressive strength obtain was 7.736 MPa. Bonding capacity between EAF slag and sand is increased by addition of sulphuric acid. Liquefaction effect and settlement was reduced compare to control sample. Photogrammetric approach seems to be a valuable way to calculate settlement of a structure. Soil stabilization with EAF slag waste material with some deeper studies can be a useful method to treat non-cohesive soils Daha fazlası Daha az

Investigation of concrete barriers with recycled rubber, steel slag and roof tile

Kurar, Ali

Yüksek Lisans | 2016 | İzmir Katip Çelebi Üniversitesi Fen Bilimleri Enstitüsü

The purpose of aggregating rubber is to increase concrete’s flexibility, elasticity, and capacity to absorb energy. In some application of concrete, it is desired that concrete should have low unit weight, high toughness and impact resistance. Although concrete is the most commonly used construction material, it does not always fulfill these requirements. In order to improve elastic properties of concrete and recycle the waste materials, new applications have been realized recently. One of these applications is the utilization of discarded tires in order to use together with aggregate. For this purpose, this research will con . . .duct investigating the physical and mechanical properties of the concrete which is obtained from incorporating pieces of discarded tires. It is thought that rubberized concrete would be an ideal material for Jersey barriers which are subjected to immediate effects of impact. Rubberized concrete could prevent life casualties and damaging the vehicles by absorbing the impact energy. In the study, metakaolin from granulated waste roof tile, furnace slag and synthetic textile fibers were studied to replace partially the cement which is valuable material in concrete satisfying TS EN 1317 concrete specifications. In this study 40 different mixtures where prepared. Flexural and compressive strength of each mixture for period of 7, 14 and 28 days was determined. Flexural and compressive strength values for each mixture were compared with control specimen strengt Daha fazlası Daha az

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