Use of Cement Granulate in Road Construction

Abstract

The possibility of using cement granulate, a product of processing old cement concrete and waste generated during the demolition of buildings and structures, has been studied in the construction, reconstruction and repair of highways. The use of recycled materials in the road industry is one of the sources of saving natural raw materials. In addition, the use of waste solves environmental problems through the disposal of old waste materials and structures. Having completed the study of cement granulate, the possibility of using it for the construction of foundations for road pavements, as well as a substitute for crushed stone in the manufacture of concrete slabs of prefabricated coverings, has been determined. In the first case of using cement granulate, the wedge method is effective. It has been experimentally confirmed that the remains of cement mortar on the surface of used crushed stone contribute to its better wedging, thereby creating a more durable base layer. In order to assess the possibility of using cement granulate as a substitute for crushed stone for the manufacture of prefabricated concrete slab, standard studies of this material were carried out, the composition of the cement concrete mixture was selected, and standard samples were manufactured and tested. The test results have shown that the use of cement granulate for such purposes is quite acceptable. In particular, the average strength of the samples in the tested batch turned out to be 45.13 MPa and the guaranteed strength was 35.13 MPa, which corresponds to the B35 class of concrete. These indicators demonstrate that the use of cement granulate may well be in demand in the construction and reconstruction of local roads. At present, as it is known, a program is being implemented to improve the transport and operational level of local roads, and this is about 70 thousand kilometers. And here, of course, a huge amount of road construction materials will be required.