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| 摘要: |
| 选用两种具有代表性的机制砂石骨料——钙质骨料与硅铝质骨料,经扫描电镜分析发现,前者主要化学成分为碳酸钙,呈岛状结构,后者为硅铝质岩,呈层状结构;通过与不同品种减水剂配制混凝土后进行浆体流动性、ζ电位及混凝土性能等试验发现,钙质骨料吸水性小,与不同减水剂的适应性良好,采用聚羧酸系减水剂配制的混凝土工作性极好,强度较高,而硅铝质骨料吸水性大,ζ电位高,与不同减水剂的适应性差,掺高性能聚羧酸系减水剂的优势也不明显. |
| 关键词: 机制骨料 减水剂 适应性 |
| DOI： |
| 分类号:TU528.042 TV422 |
| 基金项目:北京市自然科学基金
，
北京市优秀人才培养基金
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| Experimental Study on Adaptability of Machine-Made Aggregate with Water-Reducers |
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LI Chong-zhi QI Yan-jun HE Guang-ming ZHANG Quan-gui CHEN Jia-long
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| Abstract: |
| Two kinds of representative machine-made aggregates,namely the calcium-base and silialuminate-base,were chosen in the experimental study.Through analysis of SEM,it was found that the former's main chemical component was calcium carbonate with an island like structure,the latter might be a rock of silialuminate-base in a state of sandwich.Through experiments of the paste fluidity,Zeta potential and concrete test with different water-reducers it is shown that the calcium-base aggregate,which could be easily used to prepare high workability and high strength concrete with polycarboxylate water-reducer,has lower water absorption ability and good adaptability with any water-reducer,whereas the silialuminate-base aggregate has higher water absorption ability,higher zeta potential value and poor adaptability so that there might be a problem to produce HPC by using high performance polycarboxylate water-reducer. |
| Key words: machine-made aggregate,water-reducer,adaptability |
