29-06-2012, 06:04 PM
STRENGTH CHARACTERISTICS ANALYSIS OF STEEL SLAG HYDRATED MATRIX
STRENGTH CHARACTERISTICS ANALYSIS.docx (Size: 1.92 MB / Downloads: 147)
ABSTRACT
Iron and steel making slag are by products of the iron making and steelmaking processes. To date, these types of slag have been widely used in cement and as aggregate for civil works. A new product developed in Japan called “SSHM” (Steel slag hydrated matrix) which is made mainly from slag and absolutely free from natural aggregate. Steel slag hydrated matrix has the following features.
INTRODUCTION
Global warming and environmental destruction have become the major issue in recent years .Emission of host of greenhouse gases from industrial processes and its adverse impact on climate has changed the mind set of people from the mass-production, mass-consumption, mass waste society of the past to a zero-emission society, utilization of industrial wastes and conservation of natural resources.
Preventing the depletion of natural resources and enhancing the usage of waste materials has become a challenge to the scientist and engineers. A number of studies have been conducted concerning the protection of natural resources, prevention of environmental pollution and contribution to the economy by using this waste material.
STEEL SLAG
Extraction of ‘iron’ from ores is a complex process requiring a number of other materials which are added as flux or catalysts. After making steel these ingredients forming a matrix are to be periodically cleaned up. Removed in bulk, it is known as steel –slag. It consists of silicates and oxides. Modern integrated steel plants produce steel through basic oxygen process. Some steel plants use electric arc furnace smelting to their size. In the case of former using oxygen process, lime (CaO) and dolomite (CaO.Mgo) are charged into the converter or furnace as flux. Lowering the launce, injection of higher pressurized oxygen is accomplished. This oxygen combines with the impurities of the charge which are finally separated.
Utilization of slag:
The steel slag is used as aggregates. Natural aggregate resources are becoming more difficult to develop or remove aggregate from the ground when slag can be used as a substitute which reduce waste and conserve resources. It protects and preserves our environment. Benefit from technical advantages offered by many of the steel making slags. High performance products not necessarily low grade application.
FLY ASH
In many disposal areas, fly ash is hauled from the plant and disposed loose by tailgating over the edge of fly ash slope. The resulting embankment is often unsightly and costly to remain steep fly ash slopes and lack of adequate drainage often result in slides, which encroach upon resulting properties, cause erosions and silts up nearby streams.
SCOPE OF THE PRESENT STUDY
Thus, through the appraisal of the literature review it is observed that several attempts have already been made by researchers to understand the mechanism of Steel slag hydrated matrix or steel making slag concrete. However, in the present study an attempt has been made to concrete which is containing full of waste material. Hence, the experimental programme undertaken investigates.
CONCLUSION:
From the analysis above, it is observed that the compressive strength using steel slag in various proportions replacing coarse aggregate has been considerably equal to the compressive strength as in case of ordinary concrete. The reasons for the lower strength may be the water absorption capacity of steel slag. Since the water absorption is more for steel slag means the material is porous and due to which there is a little lower strength in case of concrete made of steel slag.