What is the slag?
Strog cement, often called the Ground Granuled Blast-Furnace Slag (GGBFS), is one of the most convenient cement materials used in concrete. It is actually a by -product of iron production. When iron is processed using a blast furnace, slag and iron are collected at the bottom of the furnace. The melted slag must first be separated from the molten iron. The molten slag is then diverted to the granulator, where it is quickly soaked with water until it changes in a raw material called granules. The granules then cool quickly, preventing crystals from creating and creating a glassy, non -metallic product instead. These granules are then dried and ground for suitable fineness for use as cement.
This type of cement is increasingly used as a component in the production of mixed Portland cement. The use of a slag cement to replace a part of Portland cement in a concrete mixture is a more effective way to make concrete more consistent. Among the measurable improvements to the more workability, inMore finishability, lower permeability, improved resistance to aggressive chemicals, more consistent plastic and hardened properties and higher strength and bending forces.
From the environmental point of view, the use of slag cement in concrete to produce concrete "greener". It can not only be considered recycled material, but can also significantly reduce energy and gases emitted in the production of concrete raw materials.
Strog cement is actually used in the United States in the United States for more than a century. Its earliest use was documented in 1774, when it was combined with cough lime and used as mortar. This cement was first used commercially in Germany in the 60s of the 20th century, and it was such a success that in 1889 the engineers decided to build the Paris underground metro using the cement of Vág. Slag scab mixed with Portland cement first appeared in GermanyIn 1892 and four years later he was introduced to workers in the United States. In the fifties of the 20th century, progress in the field of slag removal also caused granulation processes to be used as a completely separate product that was added in a concrete blender.
In the United States, the first cement slag device was built in 1982 in Bethlehem Steel's Furnace by Atlantic Cement in Sparrows Point, Maryland. Since then, over a dozen granulation and grinding have been built in the United States. Ten American companies produce and distribute this cement, and now there are more than 80 terminals that provide material distribution stores. Granules from domestic and imported sources are currently used in mills to satisfy growing demand.
The last few years have seen a particularly strong growth in the use of slag in the United States. One of the reasons for its growing popularity is tposting in the production that occurred in the lastdecade. In addition, the expansion of the terminal capacity has increased significantly in recent years. This cement is no longer considered a special product and instead is a commonly used material.