| 摘要: |
| 采用赫切尔-巴尔克模型拟合流变曲线，研究了含水率、外加剂（聚羧酸减水剂和季铵盐型表面活性剂）对建筑渣土泥浆在不同静置时间下流变性能的影响，并阐明了外加剂的作用机理.结果表明：随着含水率的增大，建筑渣土泥浆的流变性能参数均减小；随着2种外加剂掺量的增大，建筑渣土泥浆的初始表观黏度和塑性黏度先增大后减小；建筑渣土泥浆的屈服应力随着季铵盐型表面活性剂掺量的增加而一直增大，随着聚羧酸减水剂掺量的增大先增大后减小，相同掺量下聚羧酸减水剂的作用效果更好；外加剂分子间的排斥力与黏土对外加剂的吸附力两者之间的主导作用决定建筑渣土泥浆的流变性能. |
| 关键词: 渣土泥浆 流变性能 表观黏度 流变保持性 |
| DOI：10.3969/j.issn.1007-9629.2022.08.007 |
| 分类号:TU521.3 |
| 基金项目:国家自然科学基金资助项目（51878480， 52078369）；宁波市科技创新2025重大专项项目（2019B10048）；中央高校基本科研业务费专项资金资助项目 |
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| Influence of Different Factors on the Rheological Properties of Construction Waste Mud |
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ZHONG Yijin1,2, HE Bei1,2, REN Qiang1,2, JIANG Zhengwu1,2
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1.Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education， Tongji University， Shanghai 201804， China;2.School of Materials Science and Engineering， Tongji University， Shanghai 201804， China
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| Abstract: |
| The effect of water content， additives（polycarboxylic acid water reducer and quaternary ammonium surfactant） on the rheological properties of construction waste mud under different rest time were studied by fitting the rheological curve with Herschel-Bulkley model， and the action mechanism of additives was clarified. The results show that with the increase of water content， the rheological parameters of construction waste mud decrease. With the increase of the two additives content， the initial apparent viscosity and plastic viscosity of the construction waste mud first increase and then decrease. The yield stress of waste mud keeps increasing with increasing of the quaternary ammonium surfactant content， and first increase and then decrease with the increasing of the polycarboxylate superplasticizer content. The effect of polycarboxylate superplasticizer on the rheological properties of construction waste mud is better than that of quaternary ammonium surfactant under the same content. The dominant effect between the repulsive force of additive molecules and the adsorption force of the clay determines the rheological properties of construction waste mud. |
| Key words: waste mud rheological property apparent viscosity rheological retention |
