The 3rd bridge turned out to be very solid: It was reported that the quality of the materials, especially concrete, used in the construction of the Yavuz Sultan Selim Bridge, exceeded the standards.
It was reported that the quality and strength of the materials used in the connection roads with the Yavuz Sultan Selim Bridge were significantly higher than expected.
Istanbul Technical University (ITU) Civil Engineering Faculty Member and Building Materials Laboratory Supervisor Assoc. Dr. Hasan Yıldırım gave information to AA correspondent about the inspected building materials of Yavuz Sultan Selim Bridge.
Lightning, the university has owned all of the modern tests in the laboratory, they expressed the results they want to achieve an impartial approach to the companies that they said.
Stating that they inspected the concrete strength and the materials used in Yavuz Sultan Selim Bridge, Yıldırım gave the following information:
“The most important parts of the bridge are legs and ropes. After these are roads, viaducts and culverts. The piers of the bridge are designated as C50 in the project. The quality of the concrete is also inspected by foreign inspectors. The concrete in question has tensile and creep rates. It is tried to measure how much the concrete will become shorter over time. Since these structures are not 10-20 years old, they have to be long-term structures and then there is no possibility of change. Bridge legs are exposed to sea water and sulphate. For this reason, the properties in concrete are also according to him. Upon the request, we took concrete samples and subjected them to 8-month shrinkage and creep tests. We wondered if the concrete they called C50 was really at this level. We have seen that the concrete strength of Yavuz Sultan Selim Bridge is much higher than C50. The concrete quality of the bridge came out in C60s. This is very positive. Because after years, the pillar of the bridge cannot be strengthened. "
- "Half the ropes work"
Assoc. Dr. Lightning, came abroad Recalling the ropes used in the bridge, said he thought contrary made an inspection of these materials in Turkey. Noting that the ropes, which look like a single piece when viewed from the outside, are actually made up of thousands of wires twisted together, Yıldırım said, “Each wire forming the rope is 4-5 millimeters thick and made of steel. It is distributed to the other side in the saddle part of the bridge and stuck in the determined places. There cannot be the slightest mistake here. When looking at the quality of the current ropes, even half works. The strength of these ropes is tested with our MTS machine. We work like a mining and chemical engineering department, not just construction materials. "The carrying capacity of the ropes used in the bridge has increased compared to the ropes abroad."
Stating that the concrete of the saddle section where the ropes pass has a different content, Yıldırım stated that the connection roads are also inspected, except for the bridge. Lightning, they did many experiments in the tunnel, Yavuz Sultan Selim Bridge is one of the most solid structures in Turkey, he said in Istanbul that the C50 also performed other jobs, but he said this is very concrete.
- Earthquake Resistance
Emphasizing that no idea can be expressed about earthquake resistance in similar sized buildings, Yıldırım said, “There are rumors that it is resistant to certain violence. There is regulation. Specifications were prepared according to the magnitude of the earthquake. Standards have been set that certain structures will be built on a certain ground. If you had placed those bridge piers elsewhere, then other standards would have been spoken, except for such a rock floor. This situation depends on the location. Placing an 8-resistant building near the fault line will have a different result. Therefore, if an engineer says 'that is resistant to violence', this statement is false ”.
- Private laboratory set up for bridge
Adil Orçun Kaya, Research Assistant of the Faculty of Civil Engineering of Istanbul Technical University, who works in the audits, said that the concrete samples were inspected under special climatic conditions in the specially prepared laboratory.
Explaining that the concrete used on the bridge was poured and tested on different days, Kaya said, “We applied a determined amount of load on the concrete samples and measured their deformations depending on time. We received data from here for 8 months. Since it is a bridge construction, we made a special air conditioning here and we applied 70 percent relative humidity ”.
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