Introduction to BOFS > Features of BOFSPhysicochemical Properties
The proportion of basic oxygen furnace slag (approximately 3.2~3.4) is heavier than that of natural gravel, and its rate of the Los Angeles abrasion test and the soundness test are better than those of natural gravel. Its main chemical composition consists of calcium oxide (about 35 to 49%), followed by iron oxide (approximately 17 to 35%), silica (about 8 to 18%), a little alumina, magnesia, etc. Most of the calcium oxide combines with silicon oxide to form calcium silicate compounds, which are the main components of cement clinker; therefore, basic oxygen furnace slag possesses the cementitious property and pH value similar to those of cement.
Environmental Characteristics
Strict monthly quality testing, the Toxicity Characteristic Leaching Procedure (TCLP), on CHC’s BOFS products is carried out. The results show that the leaching concentration of heavy metals is much lower than that of the recognized standards for hazardous industrial waste and in line with the assessment standards of restricted substances for green building materials.
To link up with the world, the CSC Group has commissioned National Cheng Kung University and other academic institutes to conduct collaborative research regarding testing methods in addition to the application of the TCLP, e.g. the acid extractable contents of chemicals for content testing developed in Japan, long-term dissolution tests developed in the EU, etc. In terms of the environmental compatibility research on CHC’s BOFS products , the results have confirmed that they possess good environmental compatibility.
