| 摘要: |
| 对于不同水胶比的水泥基材料，使用压汞法研究了其在饱水养护和密封养护条件下孔隙结构的特征.结果表明：养护条件对水泥基材料的孔径分布影响明显.与饱水养护相比，密封养护能显著增加RⅢ区间（100～1000nm）的孔隙含量(质量体积)，降低RⅠ区间（<10nm）的孔隙含量；密封养护会降低水泥基材料的比表面积，增加净浆的孔隙率(体积分数)，但对砂浆孔隙率的影响较不明显.胶凝材料中的磨细高炉矿渣(质量分数为65%）和硅粉(质量分数为5%）不能完全抑制孔隙自干燥导致的孔隙连通作用. |
| 关键词: 养护条件 磨细高炉矿渣 硅灰 孔隙结构 压汞法 |
| DOI：103969/j.issn1007 9629201402001 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目(508978144） |
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| Pore Structure of Cement Based Material under Different Curing Conditions |
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LI Kefei, LUO Mingyong, PANG Xiaoyun, ZENG Qiang
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Department of Civil Engineering, Tsinghua University, Beijing 100084, China
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| Abstract: |
| The influences of curing conditions on the pore structure of cement based material with different water binder ratios were investigated via mercury intrusion porosimetry(MIP). The results show that curing condition has substantial influence on the pore structure of cement based material. Compared to the saturated curing, the sealed curing increases the pore content(mass volume) in 1001000nm but decreases that in <10nm. By sealed curing the specific surface area of cement based material is decreased, while the porosity(by volume) for pastes is increased, but the porosity for mortars has less obvious change. The secondary cementitious material, ground granulated blast furnace slag(65%, by mass) and silica fume(5%, by mass), show limited capacity to resist the pore percolation by self desiccation. |
| Key words: curing condition ground granulated blast furnace slag(GGBS) silica fume pore structure mercury intrusion porosimetry |
