APPLICATION OF FLY ASH AND OTHER INDUSTRIAL WASTES IN PRODUCTION

Abstract

This article presents a review of modern technologies for constructing cement concrete roads, focusing on increasing durability, environmental sustainability, and economic efficiency of transport infrastructure. Global trends in the use of concrete pavements in countries with various climatic conditions are analyzed, as well as the possibilities for their implementation in the Republic of Kazakhstan and Central Asia. Special attention is given to the use of mineral additives and industrial wastes (fly ash, blast furnace slag, microsilica, crushed glass) for modifying cement concrete mixtures. The results of studies on the effects of these additives on strength, water absorption, frost resistance, and crack resistance of concrete are reviewed. Foreign experience in the use of monolithic, precast, and reinforced concrete pavements, including CRCP, RCC, and whitetopping technologies, is summarized. It is shown that the use of modified concrete pavements can extend the service life of roads to 30–50 years and reduce operating costs by 30-40 %. Prospects for the application of these technologies under the conditions of Kazakhstan, taking into account climatic and operational features, are identified.