3D-Printed Mortars with Combined Steel and Polypropylene Fibers
Valery Lesovik,
Roman Fediuk,
Mugahed Amran,
Arbi Alaskhanov,
Aleksandr Volodchenko,
Gunasekaran Murali,
Valery Uvarov,
Mikhail Elistratkin
Affiliations
Valery Lesovik
Department of Building Materials Science, Products and Structures, Belgorod State Technological University Named after V.G. Shukhov, 308012 Belgorod, Russia
Roman Fediuk
Polytechnical Institute, Far Eastern Federal University, 690922 Vladivostok, Russia
Mugahed Amran
Department of Civil Engineering, College of Engineering, Prince Sattam Bin Abdulaziz University, Alkharj 16273, Saudi Arabia
Arbi Alaskhanov
Institute of Construction, Architecture and Design, Grozny State Oil Technical University Named after Academician M.D. Millionshchikov, 364000 Grozny, Russia
Aleksandr Volodchenko
Department of Building Materials Science, Products and Structures, Belgorod State Technological University Named after V.G. Shukhov, 308012 Belgorod, Russia
Gunasekaran Murali
School of Civil Engineering, SASTRA Deemed to Be University, Thanjavur 613001, India
Valery Uvarov
Department of Heat and Gas Supply and Ventilation, Belgorod State Technological University Named after V.G. Shukhov, 308012 Belgorod, Russia
Mikhail Elistratkin
Department of Building Materials Science, Products and Structures, Belgorod State Technological University Named after V.G. Shukhov, 308012 Belgorod, Russia
Fibers of various origins are of great importance for the manufacture of new generation cement composites. The use of modified composite binders allows these highly efficient building materials to be used for 3D-printing of structures for various functional purposes. In this article, changes in building codes are proposed, in particular, the concept of the rheological technological index (RTI) mixtures is introduced, the hardware and method for determining which will reproduce the key features of real processes. An instrument was developed to determine a RTI value. The mixes based on composite binders and combined steel and polypropylene fibers were created. The optimally designed composition made it possible to obtain composites with a compressive strength of 93 MPa and a tensile strength of 11 MPa. At the same time, improved durability characteristics were achieved, such as water absorption of 2.5% and the F300 frost resistance grade. The obtained fine-grained fiber-reinforced concrete composite is characterized by high adhesion strength of the fiber with the cement paste. The microstructure of the developed composite, and especially the interfacial transition zone, has a denser structure compared to traditional concrete. The obtained materials, due to their high strength characteristics due to the use of a composite binder and combined fiber, can be recommended for use in high-rise construction.
