|dc.description.abstract||Porous asphalt concrete (PAC) is one alternative solution to the problem of stormwater drainage from parking and other low traffic density areas. The overall benefits of porous asphalt concrete may include both environmental and safety benefits including improved stormwater management, improved skid resistance, reduction of spray to drivers and pedestrians, reduction in light reflection and headlight glare, as well as a potential for noise reduction. However, there are disadvantages of this pavement type such as has lower service life than dense mixes. Steel slag is the material generated from purifying metal, their casting and alloying. It is steel slag that can be used as an aggregate substitution. The objective of this study was to evaluate the performance and thermal properties of porous asphalt concrete containing steel slag.
Two types of steel slag were used to subtitute coarse aggregate, including Basic Oxygen Furnace (BOF) and Baoshan Slag Short Flow (BSSF). Three different percentages of steel slag, namely 0%, 30%, and 50%, were mixed. Two main aspects are investigated in this study. One is mixture performance, including resilient modulus, rutting potential, skid resistance, and moisture susceptibility test. The other is thermal properties characteristic, including thermal conductivity, thermal heat capacity, and thermal diffusivity. Statistical were utilized to determine which treatment has the best performance result.
The test results show that steel slag has higher specific gravity, high absorption, but lower L.A. abrasion, and soundness compared with natural aggregate. PAC containing steel slag may enhance the resilient modulus, skid resistance, rutting potential, and moisture susceptibility. However the application of high percentage of steel slag may decrease the performance of PAC, such as decrease skid resistance, rutting potential, and moisture susceptibility. The statistical analysis results show that PAC containing 30% of BOF slag has the best performance results, however this kind of pavement had the highest thermal conductivity and thermal diffusivity compared with others. The conclusions indicate that both BOF and BSSF slag are suitable to used as coarse aggregate substitution in PAC.