Physical Properties of Activated Slag Concrete Using Phosphogypsum and Waste Lime as an Activator

Abstract

This study aims to evaluate the physical properties of non-sintering cement (NSC) concrete by adding phosphogypsum (PG) and waste lime (WL) to granulated blast furnace slag (GBFS) as sulfate and alkali activators. The study measured changes in the physical properties of fresh concrete using NSC, and the compressive, flexural and tensile strength of the hardened concrete for 360 days. In the results of the experiment, concrete using NSC was superior to that using Ordinary Portland Cement (OPC) or blast-furnace slag cement (BSC) in terms of fluidity and hydration heat characteristics. In addition, the early strength of concrete using NSC was relatively low at around 85% of the strength of concrete using OPC on day 3, but this was reversed from day 7 and the difference between OPC and BSC grew steadily larger over time until day 360. The strength of concrete using NSC develops continuously because the GBFS component eluting as GBFS is activated by PG and WL, and due to their reaction, ettringite, C-S-H gel, etc. are generated steadily for a long time, and there is no transition zone in the interface between the aggregate and paste because Ca (OH) 2 is hardly generated from the hydration process, and as a result, interfacial adhesion is reinforced with aging.

Study on the Preparation and Fracture Behavior of Red Mud-Yellow Phosphorus Slag-Based Concrete

“…New kinds of mineral admixtures are gradually being used in concrete production because the traditional mineral admixtures are becoming increasingly scarce [2]. Recently, in the cement industry, there has been an increasing interest in partially or completely replacing cement with industrial solid wastes, such as fly ash [21,22], yellow phosphorous slag [4,23], red mud [24,25], blast furnace slag [26,27], and phosphogypsum [28,29].…”

Diffusion and Containment Factors of Innovative Technology for Obtaining Building Materials From Phosphogypsum in the Industry

“…Скорость внедрения инновации напрямую зависит от маркетинга, от проработанности комплекса 4Р (product (продукт), price (цена), place (место-распространение), promotion (продвижение). Совокупность действий по маркетингу продвижения складывает мнение о компании и ускоряют процесс распространения внедрения инновации [10,12].…”

Development and Field Application of Phosphogypsum-Based Soil Subgrade Stabilizers

“…Lime and cement are traditional soil subgrade stabilizers that are extensively used in road engineering, owing to their superior economic and excellent solidification effects [14][15][16][17][18]. However, production of lime and cement requires large amounts of natural raw materials, and the process emits large amounts of harmful exhaust gases, such as CO 2 , SO 3 , and NOX [19,20]. To protect the ecological environment and lower road construction cost, researchers are currently exploring use of industrial waste as a substitute for traditional cement and lime.…”