Road surfaces made of nanomodified fiber-reinforced concrete

The article combines the author's results over the past few years. Object of study: road surfaces made of nanomodified fiber-reinforced concrete. The goal of the work is to develop a scientifically based technological solution aimed at improving road surfaces made of nanomodified fiber-reinforced concrete, as well as a comprehensive study of their characteristics. Methods. The granulometry of composite binders was studied using laser granulometry. The technological properties of the mixtures were determined by assessing the cone settlement. Average density was calculated by dividing mass by volume. Compressive strength was determined under static load on cubic samples with an edge of 70 mm on days 3, 7 and 28. Results. A technological solution for the production of modified basalt fiber-reinforced concrete has been developed and experimentally confirmed, which consists in creating ultra-high-density packaging of hydrate formations at the nanolevel using non-traditional raw materials (aluminosilicates obtained using the developed technology, as well as hydrothermal nanosilica). As a result, the modified composite binder, together with basalt microfiber, selected in accordance with the law of similarity of components, provides an increase in tensile strength in bending of fiber-reinforced concrete by 4 times and impact endurance by 9 times. The flexural tensile to compressive strength ratio of 0.25 confirms effective performance under dynamic and impact loads. This is ensured by the efficiency of structure formation in the early stages (tensile strength during bending in 1 day is 3.6 MPa).

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