The modified compact tension test (MCT) might become in the future a stable test configuration for the evaluation of fracture-mechanics parameters or also for description of fatigue behavior of composites materials such as concrete. Core drilling is used for sampling of existing structures. These samples have cylindrical shape with the selected thickness to avoid the stress concentration. This contribution focuses on the evaluation of the fracture behavior during static and quasi static tests. Static tests are performed on standard specimen with diameter 150 mm and length 300 mm. The quasi-static tests are performed using two different gripping fixtures. The results for quasi-static tests are represented as L-COD diagrams (i.e. load vs. crack opening displacement) measured on the loading axis. The comparison of results and discussion of advantages and disadvantages are introduced.
Concretes used in civil structures are usually made on ordinary Portland cement (OPC) base. Alkali activated concretes (AAC) are considered as a perspective building materials. They show high strength, good durability, and good resistance to aggressive agents etc. This paper introduces the values of the basic fatigue parameters of both types of concrete; the alkali-activated concrete is prepared as a new material for the potential production of concrete elements developed by ZPSV, a.s. company. The concrete mixtures have a similar utilization and therefore the fatigue parameters can be compared. The specimens were prepared and tested under static (compressive strength) and cyclic loading (fatigue parameters Wöhler curve). The experimentally obtained results (mechanical and fatigue) of both types of concrete are compared and the suitability of these types of composites for their application is discussed.
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