Study on Strength Properties of Fiber-Cement-Stabilized Soil Using Waste Gypsum Board Paper

A new recycling method for high water content sludge called “Fiber-cement-stabilized soil” has been developed. In this method, crushed old newspaper (fragments of old newspaper) and cement are mixed with the sludge. The improved soil produced by this method has several features. However, recently, the price of crushed old newspaper is increasing, and the recycling cost is increasing. Therefore, waste gypsum board paper as a substitute for crushed old newspaper is focused on because most of the waste gypsum board paper is disposed in the final disposal site, they can be obtained at an extremely low cost. In this study, the strength characteristics of improved soil using waste gypsum board paper were investigated from the results of the unconfined compression test. From the results, the waste gypsum board paper can be used as a substitute for crushed old newspaper although a considerably larger amount of board paper had to be added to achieve the same failure strength as that of the fiber-cement-stabilized soil. In addition, it is possible that the additive amount of board paper can be determined by the results of the bleeding test after 96 h.