In a concrete composite, a
cement matrix is the main cause of an unfavourable concrete creep and it is
impossible to reach a better use of its load-carrying component i.e. rock
aggregate. In the same time, compression strength of basic rocks used in
building technology such as basalt, porphyry and even granite is in fact quite
sufficient for future structural needs. Strength of these materials is equal to
Rc = 200 – 400 MPa and in structures made from
traditional concrete is used in 15 – 20% only. Therefore there are carried out
actions to apply solid rocks into the compressed area of a concrete beam
cross-section instead of concrete. Such solution will multiply the beam
load-carrying ability. It concerns cross-sections of columns, arcs and
especially beams exerted to bending. In the paper, principles of creation of
rock-concrete structures and promising results of tests carried out on columns,
and beams are shown.