| 摘要: |
| 在阴离子型乳化沥青中分别添加NaCl和CaCl2电解质，考察Na+，Ca2+阳离子对阴离子型乳化沥青储存稳定性的影响规律.通过分析电解质掺加前后阴离子型乳化沥青zeta电位、粒径分布和微观形貌的变化，探讨Na+，Ca2+阳离子对阴离子型乳化沥青储存稳定性的影响机理.结果表明：Na+对阴离子型乳化沥青的储存稳定性无明显影响，而Ca2+则显著降低阴离子型乳化沥青的储存稳定性，且影响程度随Ca2+浓度提高而呈上升趋势.Ca2+吸附并聚集在沥青微粒周围，降低了沥青微粒间的静电斥力，导致沥青微粒聚集，最终降低了阴离子型乳化沥青的储存稳定性.在阴离子型乳化沥青生产用水中Ca2+浓度不宜超过1.9mmol/L，且不宜使用可电离出Ca2+的添加剂. |
| 关键词: 阳离子 乳化沥青 储存稳定性 |
| DOI：10.3969/j.issn.1007 9629.2013.05.015 |
| 分类号: |
| 基金项目:国家重点基础研究发展计划(973计划)项目(2012CB724601) |
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| Effect of Cations on Storage Stability of Anionic Emulsified Asphalt |
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XU Jing1, HONG Jin xiang1, LIU Jia ping1, WAN Yun2
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1.State Key Laboratory of High Performance Civil Engineering Materials, Jiangsu Research Institute of BuildingScience Co., Ltd., Nanjing 210008, China;2.Jiangsu Bote New Materials Co., Ltd., Nanjing 210008, China
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| Abstract: |
| The effect of cations(Na+, Ca2+) on the storage stability of anionic emulsified asphalt were studied by adding electrolytes of NaCl and CaCl2 to anionic emulsified asphalt. Zeta potential, particle size distribution and microstructure of anionic emulsified asphalt with or without electrolyte added were determined to analyze the impact mechanism. Results show that Na+ has no significant effect on the storage stability of anionic emulsified asphalt, but Ca2+ has remarkable adverse effect on the storage stability of anionic emulsified asphalt, and the degree of influence is enhanced by increasing Ca2+ concentration. The reasons for that are the adsorption and aggregation of Ca2+ on the surface of asphalt particles, and reduction of the electrostatic repulsion between the asphalt particles causing aggregation of asphalt particles. Thus, the Ca2+ concentration in the water used for producing anionic emulsified asphalt shouldnt exceed 1.9mmol/L, and the additives which could ionized to form Ca2+ shouldnt be used. |
| Key words: cation emulsified asphalt storage stability |
