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本文以强度和孔隙率与长深高速公路沥青路面相似的沥青块为实验对象,分析沥青材料对径流重金属离子的吸附捕获作用。分析结果表明:沥青混凝土对Zn,Pb,Cu,Ni,Cr的吸附作用有着相同的变化特征;小孔隙沥青混凝土对Zn的吸附率由高浓度时的8.9%增加到低浓度时的64.2%,大孔隙沥青混凝土对Zn的吸附率由高浓度时的4.05%到低浓度时的23.04%;水样中Zn的浓度较高时,渗透压强对Zn吸附率的影响较小,随着水样中Zn浓度的降低,渗透压强的影响逐渐增加;渗透压强为0.01MPa时,小孔隙沥青混凝土对高浓度、事件平均浓度(EMC)和低浓度Zn的吸附率高于大孔隙沥青的吸附率,前者分别是后者的2.2、3.27和2.78倍。
In this paper, asphalt blocks with similar strength and porosity to asphalt pavements of Chang-Shen expressway are used as experimental subjects to analyze the adsorption and trapping effect of asphalt on heavy metal ions. The results show that the adsorption characteristics of Zn, Pb, Cu, Ni and Cr in asphalt concrete have the same variation characteristics; the adsorption rate of Zn in small-pore asphalt concrete increases from 8.9% in high concentration to 64.2% in low concentration, Macroporous asphalt concrete adsorption rate of Zn increased from 4.05% at high concentration to 23.04% at low concentration. When the concentration of Zn in water sample was higher, the osmotic pressure had less effect on the adsorption rate of Zn, Zn concentration decreased, the influence of osmotic pressure increased gradually. When the osmotic pressure was 0.01MPa, the adsorption rate of high-concentration, event-average concentration (EMC) and low concentration Zn of small-pore asphalt concrete was higher than that of macroporous asphalt. Respectively, the latter of 2.2, 3.27 and 2.78 times.