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Lightweight aggregates coated with colemanite
Alper Bideci,Özlem Sallı Bideci,Sabit Oymael,Ali Haydar Gültekin,Hasan Yıldırım 사단법인 한국계산역학회 2017 Computers and Concrete, An International Journal Vol.19 No.5
Technological advancements in the field of building materials are achieved day by day. In this study, a new lightweight concrete aggregate is produced by mixing certain rates of colemanite (0%, 7.5%, 12.5%, 17.5%), cement and coating the surface of pumice aggregate with this mixture. Thin aggregate sections are analyzed with specific gravity, unit weight, water absorption, impact, and crushing experiments. In this way, the production of cement and cement+colemanite coated lightweight concrete aggregates is investigated and an opinion on the likely behavior of these concrete types is provided.
( ?lknur Albayrak ),( Sinan Bagcacı ),( Ali Sallı ),( Sami Kucuksen ),( Hatice Ugurlu ) 대한내과학회 2013 The Korean Journal of Internal Medicine Vol.28 No.5
Ankylosing spondylitis (AS) is a chronic inflammatory rheumatological disease affecting the axial skeleton with various extra-articular complications. Dysphagia due to a giant anterior osteophyte of the cervical spine in AS is extremely rare. We present a 48-year-old male with AS suffering from progressive dysphagia to soft foods and liquids. Esophagography showed an anterior osteophyte at C5-C6 resulting in esophageal compression. The patient refused surgical resection of the osteophyte and received conservative therapy. However, after 6 months there was no improvement in dysphagia. This case illustrates that a large cervical osteophyte may be the cause of dysphagia in patients with AS and should be included in the diagnostic workup in early stages of the disease.