Abstract
Recently, it has become important to develop new building materials which have various performances to create safe and comfortable space to live in. In the present study, the authors found the procedure to obtain light-weight powders (Surface Modified Slag; SMS), which can be used as a raw material of high performance building material, from blast furnace slag which is known as a recycle oriented material.SMS is prepared from water-granulated fine blast furnace slag through hydraulic reactions by treating with NaOH aq. solution. The slag powder surface can be drastically modified to increase its specific surface area by the treatment.By using SMS, the authors developed a light-weight body which has various desirable properties such as high strength, incombustibility and machinability. To obtain these properties, the following items were studied; (1) processing condition of SMS, (2) improvement of polymer emulsion as a binder of this body to increase strength and machinability, (3) surface modification of glass fiber as a reinforcement to improve strength performance of this body, and (4) forming condition of this body.The results proves that this body is useful as a building material because of having various performances to create safer and more comfortable space. Such performances can be accomplished by means of suitable combination of raw materials such as SMS, polymer emulsion and fibers, mixing compositions of these raw materials and processing condition. Moreover, this body has a hygroscopic performance and is easily colored and embossed because of large specific surface area and finess of SMS powder.
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