| The Hydration Characteristics and Expansion Machanism of Expansive Cement at Low W/B Ratio |
| |
| 作者姓名： | 吕林女 |
| |
| 作者单位： | Wuhan University |
| |
| 基金项目： | Fundedby 973High techProjectofChina (No.2 0 0 1CB6 10 70 4 - 2 )andtheNaturalScienceFoundationofHubeiProvince(No.2 0 0 2AB0 75 ) |
| |
| 摘 要： | 1 IntroductionAnexpansiveagentcannotonlymakethestructurehasself waterproofperformance ,butalsoreducetheshrinkageandthecrackingofconcreteeffectively .Soitisextensivelyusedincommonconcrete .However,theappli cationofexpansiveagentinhigh strengthconcreteisnotattractedmuchattention .Itisnotonlybecauseofthebondageoftraditionalviewpointthatitsshrinkagevalueofhigh strengthconcreteismuchgreaterthanthatofcom monconcrete ,butalsothedeficiencyofadequatestudyonthehydrationcharacteristicsandexpansivemechan…
|
The Hydration Characteristics and Expansion Machanism of Expansive Cement at Low W/B Ratio |
| |
| LU Lin-nu,HE Yong-jia,LI Yue,DING Qing-jun,HU Shu-guang.The Hydration Characteristics and Expansion Machanism of Expansive Cement at Low W/B Ratio[J].Journal of Wuhan University of Technology. Materials Science Edition,2003,18(4). |
| |
| Authors: | LU Lin-nu HE Yong-jia LI Yue DING Qing-jun HU Shu-guang |
| |
| Affiliation: | LU Lin-nu HE Yong-jia LI Yue DING Qing-jun HU Shu-guang Wuhan University of Technology |
| |
| Abstract: | The hydration characteristics and expansion impetus of three kinds of cement paste under free- and confined-curing conditions were investigated, which were respectively mixed with three different kinds of expansive agent at low W/B ratio.The results show that the hydration products of pure cement paste and paste mixed with expansive agent are same,but the amount of hydration products,un-hydrated C 3S and C 2S are obviously different at the same hydration age.At 3d age,the amount of CH in pure cement paste is less than that of paste mixed with expansive agent,but it is reverse when at 28d age.The amount of AFt at 3d and 28d age in pure cement paste is less than those of paste mixed with expansive agent.Regardless of under free- or confined-curing condition,the amount of ettringite produced varies little since 3d age.The joint effect of the tumefaction of gel-ettringite due to water absorption and the expansive pressure on the pore caused by the crystalloid ettringite is the cause of the volume expansion of cement paste,and the former effect is much greater than the latter. |
| |
| Keywords: | expansive cement hydration expansion mechanism |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
