Development of compositions of slag-alkaline binding materials for pavement products

Abstract

In this work, blast furnace granulated slag of the Kamet-Stal plant was investigated. It was established that the slag belongs to the basic ones. According to the quality factor, the slag belongs to grade 1 and can be used to fabricate slag-alkaline binding material by the alkaline method of activation. A significant part of the slag is in an X-ray amorphous state, which contributes to the production of strong cement stone in the late stages of hardening. The crystalline phases of the slag exhibit weak binding properties and provide strength to the hardened slag-alkaline binding material. To activate the slag and plasticize the composition, portland cement and clay were introduced into it, sodium liquid glass, caustic soda solution and soda ash solution being used as an alkaline sealer. The exclusion of clay from the basic composition leads to an increase in strength almost twice due to additional activation of slag with portland cement. A significant drawback in this case is the numerous precipitates that appear on the samples already on the first day of hardening. Thus, for accelerated curing times, increased mechanical strength, reduction in the amount of leaching and a significant reduction in the cost of finished products, we suggested the composition containing 91 wt.% slag; 6 wt.% clay; and 3 wt.% portland cement closed with a solution of liquid glass with a modulus of 2.3 and a density of 1300 kg/m3.