International Union of Testing and Research Laboratories for Materials and Structures International Union of Testing and Research Laboratiories for Materials and Structures International Union of Testing and Research Laboratries for Materials and Structures International Association of Testing and Research Laboratories for Materials and Structures. International Union of Testing & Research Laboratories for Materials & Structures. International Union of Testing ��� Research Laboratories for Materials ��� Structures.: Testing during concrete construction. Calculating theories and methods on damage of materials and structures