摘要
为了研究与沥青混合料接触后水质的变化,首先在实验室内成型了10组沥青混合料的马歇尔试件,成型试件时考虑了不同的沥青混合料级配、空隙率和沥青标号,以及添加抗剥落剂等因素,并把试件放入不同pH值的水样中真空饱水24 h;然后按照中国生活饮用水评价指标,测试了真空饱水后水样的pH值、耗氧量、总硬度及重金属含量.结果表明：沥青混合料真空饱水24h后,水质恶化明显,中性水样pH值约增大0.4倍,酸性水样pH值则增大1.7倍以上,在沥青混合料中添加抗剥落剂以及降低沥青混合料的空隙率可以有效降低水样pH值的增大幅度;水样的化学耗氧量增大3～4倍,通过降低沥青混合料空隙率、适当提高初始水样的pH值至中性等方式,可以降低水样中有机物的含量;水样的总硬度增大3～4倍,在沥青混合料中添加抗剥落剂可降低水样总硬度的增大幅度.
In order to study the water quality after the interaction with asphalt mixture,ten groups of Marshall samples of asphalt mixture with different air void percentages,gradations,asphalt grades and antistripping agent were prepared firstly.Water samples with different pH values were also prepared in laboratory.Then,the asphalt mixture samples were immersed in the vacuum sealing water for 24 h.Some indices including pH value,oxygen demand,total hardness,content of heavy metals were selected from the standards for drinking water quality to evaluate the water quality after its contact with asphalt mixture.Results show that water quality is deteriorated significantly when asphalt mixture is immersed in the water samples for 24 h.pH values of neutral and acid water samples are 0.4 times and 1.7 times that before immersion test respectively.The increase of pH values can be reduced by anti-stripping agent and lower air voids of asphalt mixture.After immersion test,oxygen demand and total hardness of water sample are increased over 3 to 4 times.Lower air voids of asphalt mixture and increasing pH value of initial water sample to neutral condition can reduce the oxygen demand.The increase of total hardness can be retarded by using anti stripping agent in asphalt mixture.
出处
《建筑材料学报》
EI
CAS
CSCD
北大核心
2014年第5期933-938,共6页
Journal of Building Materials
基金
国家自然科学基金资助项目(51208178)
中国博士后科学基金资助项目(2012M520991)
关键词
水污染
沥青混合料
PH值
耗氧量
总硬度
重金属
water pollution
asphalt mixture
pH value
oxygen demand
total hardness
heavy metal
