Abstract
Porous concrete planted with grass is attractive both environmentally and esthetically for applications in residential driveway, sidewalk and parking lots. Disposal of papermaking sludge is a challenging environmental problem. As a possible solution, grass cultivation in porous concrete filled with mixtures of papermaking sludge and soil was studied. Bermuda grass, Perennial ryegrass, and Tall Fescue were tested. Experimental results showed that the papermaking sludge retarded the germination of grass seeds only slightly, while promoted the growth of grass stems and the development of grass roots significantly. The optimum ratio of the papermaking sludge to soil appears to be in the range of 25 to 50%. Therefore, it is believed that papermaking sludge is suitable for grasses cultivation in the porous concrete.
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