| 摘要: |
| 通过测定水泥-石灰石粉浆体的屈服应力，并基于EDLVO理论计算不同运输时间下浆体颗粒间的作用力，研究了运输时间对浆体屈服应力的影响机制.结果表明：各运输时间下浆体的屈服应力随着颗粒总比表面积的增加先减后增，随着运输时间的增加逐渐增大；浆体中颗粒的水膜厚度与屈服应力具有良好的负相关性；同一颗粒间距下，随着石灰石粉掺量和细度的增加，浆体的范德华力和A-B作用力逐渐减小，静电力没有明显变化规律，且不同浆体的颗粒间总作用力变化较小.同时还建立了不同运输时间下浆体屈服应力与颗粒间总作用力的关系. |
| 关键词: 石灰石粉 屈服应力 运输时间 颗粒间作用力 |
| DOI：10.3969/j.issn.1007-9629.2022.06.010 |
| 分类号:TU528.01 |
| 基金项目:国家自然科学基金资助项目（51278497）；中南大学研究生自主探索创新项目（2022zzts624） |
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| Influence of Transport Time on Yield Stress of Cement-Ground Limestone Paste |
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HU Xiaoyan1, XIAO Jia1, HAN Kaidong1, ZHANG Zedi1, TIAN Chengyu2
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1.School of Civil Engineering， Central South University， Changsha 410075， China;2.Research and Design Institute of Sinohydro Engineering Bureau 8 Co., Ltd., Power Construction Corporation of China， Changsha 410004， China
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| Abstract: |
| By measuring the yield stress of cement-ground limestone pastes and calculating the interparticle forces of pastes under different transport time based on EDLVO theory， the mechanism of the change of yield stress of pastes under different transport time was studied. The results show that the yield stress decreases first and then increases with the increase of the total specific surface area. The yield stress of pastes increases with the increase of transport time. There is a good negative correlation between water film thickness of pastes and yield stress. At the same particle spacing， the van der Waals forces and A-B forces of pastes decreases with increasing content and fineness of ground limestone， while electrostatic force has no obvious change rule. Moreover， the variation of the total interparticle force with different cement-ground limestone pastes is small with the same particle spacing. The relationship between yield stress and total interparticle forces and average spacing under different transport time is established. |
| Key words: ground limestone yield stress transport time interparticle force |
