Author(s)

MARCEL JOGL, ŠÁRKA PEŠKOVÁ, RADOSLAV SOVJÁK, JAN VALENTIN, ROSTISLAV ŠULC

Abstract

This paper describes the results and an example of the use of secondary materials in concrete for application to practice, which were obtained from a project in cooperation with the University CTU in Prague and company Hochtief CZ a.s. Extensive experiments were carried out in the project, where the ideal concrete with admixtures was sought. Prefabricated part made of concrete composite with minimized cement content was realized, which replaced binder based on the use of secondary materials that apply modified energy by-products. It is a hydraulic ternary binder, which replaces cement in the amount of 50% compared to the original production formulation of concrete. The prefabricated part uses recycled materials or secondary raw materials of the by-product type in combination with the reduction of energy intensity, which is primarily associated with the production of cement. The implementation of the operational test of the production of the basic slab element for the prefabricated part was carried out at the concrete plant of the company Chynovska 714, 391 11 Plana nad Luznici of the company Hochtief CZ a.s., on 2 October 2019 with the possibility of further use for soundproof walls waste rubber in a thickness of 20 mm, with resistance to aggressive environments and service life of 30 years. The new implementation has a positive impact on the environment while achieving a lower carbon footprint and at the same time the use of part of materials that otherwise end up as waste, the implementation leads to CO2 reduction and actively supports the Waste Management Plan of the Czech Republic (WMP) for the period 2015–2024.

Keywords

fly ash, hydraulic ternary binder, recycled materials, prefabricated components, mechanical properties