炉渣粉料对多孔沥青混合料性能影响的试验研究

通过试验研究了采用生活垃圾焚烧炉渣粉料(BAP)以不同比例替代石灰岩矿粉用于多孔沥青混合料的可行性及替代率对混合料各项性能的影响;采用马歇尔试验方法对常规多孔沥青混合料进行了配合比设计,以此为基准使用不同替代率炉渣粉料(质量分数分别为25%、50%和100%)的多孔炉渣沥青混合料进行了配合比设计,并分析了炉渣粉料替代率对最佳沥青用量的影响;基于室内试验结果,分析了炉渣粉料替代率对混合料高温性能、低温性能、水稳定性和透水性能的影响。试验结果表明:所设计的多孔炉渣沥青混合料各项性能指标均能满足相应规范的要求;炉渣粉料替代率对混合料的最佳沥青用量和透水性能影响显著,对混合料的高低温性能和水稳定性影响非常有限。

垃圾焚烧炉渣粉替代矿粉对沥青混合料性能的影响

探讨了生活垃圾焚烧(MSWI)炉渣粉料(BAP)100%(质量分数)替代矿粉配制沥青混合料的可行性及其对沥青混合料性能的影响.进行了炉渣粉沥青混合料的配合比设计,分析了炉渣粉料对各项马歇尔指标以及沥青用量的影响;评价了炉渣粉料对沥青混合料路用性能的影响.结果表明:炉渣粉料的加入会使设计沥青用量增加,沥青混合料的马歇尔稳定度有所提高;炉渣粉料的表面形貌粗糙多孔,提高了沥青混合料的高温稳定性;炉渣粉料替代矿粉后,设计沥青用量的增加和混合料内部嵌挤结构的增强可以改善沥青混合料的低温抗裂性能;炉渣粉料中的Si O2和金属氧化物会导致沥青混合料的水稳定性有略微的降低;沥青对炉渣粉料的浸润更加良好,黏附状况更加理想.

Sulfuric Acid Resistance of Concrete with Blast Furnace Slag Fine Aggregate

The deterioration of concrete by sulfuric acid attack in sewage environments has become a serious problem for many existing sewage structures. In this study, the properties of concrete using the blast furnace slag have been examined. It was shown that by using the blast furnace slag fine aggregate and blast furnace slag fine powder, it is possible to enhance the resistance of mortar and concrete to sulfuric acid. The resistance to sulfuric acid of mortar and concrete can be improved by using a blast-furnace slag fine aggregate in the total amount of fine aggregate. When mortar or concrete reacts to sulfuric acid, dihydrated gypsum film is formed around the particulate of the fine aggregate. This dihydrated gypsum film could retard the penetration of sulfuric acid, thus, improving the resistance to sulfuric acid. Furthermore, it has been proved that the relationship between the erosion depth by sulfuric acid attack and the product of immersion period and concentration of sulfuric acid can be expressed linearly. However, this relationship is dependent on the type of materials of concrete.