أرسل هذا في رسالة قصيرة: Use of incineration fly ash as a substitute for cement in geotechnical applications

  _____     ______   _    _     _____     ______  
 |__  //   /_   _// | || | ||  |  ___||  /_   _// 
   / //     -| ||-  | || | ||  | ||__      | ||   
  / //__    _| ||_  | \\_/ ||  | ||__     _| ||   
 /_____||  /_____//  \____//   |_____||  /__//    
 `-----`   `-----`    `---`    `-----`   `--`