不同极性乳化沥青水泥浆液性能研究

Study on the Performance of Emulsified Asphalt Cement Slurries with Different Polarities

【目的】探究离子极性、水灰比、沥灰比对水泥乳化沥青浆液(CEA)的流动度、抗压强度、收缩特性的影响规律与机理。【方法】通过多组分配比试验,研究各因素对CEA性能的影响规律与机理,并结合正交分析法研究不同因素对CEA浆体性能的影响程度。【结果】当沥灰比(A/C)为0.2时,随着水灰比(W/C)由0.35增加至0.45,不同离子型的CEA浆体流动度、3 d抗压强度与凝固收缩均增大;当W/C相同时,阳离子CEA浆体流动度以及凝固收缩最小,但3 d抗压强度最大,阴离子CEA浆体流动度和凝固收缩最大,而3 d抗压强度最小。【结论】在实际工程中若对浆体凝固后的强度要求较高,可优先考虑阳离子乳化沥青。若需要高流动性CEA浆液则优先考虑阴离子乳化沥青,并考虑浆体的凝固收缩。

[Purposes]This paper aims to investigate the effects and mechanisms of ionic polarity,watercement ratio,and ratio of asphalt to cement on the fluidity,compressive strength,and shrinkage characteristics of cement emulsified asphalt(CEA)slurry.[Methods]This study examines the influence laws and mechanisms of various factors on the performance of CEA through multiple component ratio experiments and investigates the impact levels of different factors on the performance of CEA slurry using orthogonal analysis.[Findings]When the A/C is 0.2,with the W/C increasing from 0.35 to 0.45,the fluidity,compressive strength at 3 days,and setting shrinkage of CEA slurry with different ionic polarity all increase.When the W/C is constant,the cationic CEA slurry has the minimum fluidity and solidification shrinkage,but the maximum compressive strength at 3 days,whereas the anionic CEA slurry has the maximum fluidity and solidification shrinkage,but the minimum compressive strength at 3 days.[Conclusions]In practical engineering applications,if a high strength of the slurry after solidification is required,it is recommended to give priority to cationic emulsified asphalt.If high fluidity CEA slurry is needed,priority should be given to anionic emulsified asphalt,and the solidification shrinkage of the slurry should be considered.