Effect of Admixture on Freeze-thaw Damage of Sleeve Grouting Materials
This paper compares the physical and mechanical properties of sleeve grouting materials with different admixtures under freeze-thaw action by means of control variable method,studies the effects of different admixtures and different contents on the apparent morphology,mass loss and strength loss of...
Saved in:
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | zho |
| Published: |
Editorial Office of Pearl River
2020-01-01
|
| Series: | Renmin Zhujiang |
| Subjects: | |
| Online Access: | http://www.renminzhujiang.cn/thesisDetails#10.3969/j.issn.1001-9235.2020.12.011 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | This paper compares the physical and mechanical properties of sleeve grouting materials with different admixtures under freeze-thaw action by means of control variable method,studies the effects of different admixtures and different contents on the apparent morphology,mass loss and strength loss of sleeve grouting materials under freeze-thaw action,and further analyzes the change of species,quantity and morphology of hydration products in freeze-thaw cycle by SEM (scanning electron microscope).The results show that:After 120 freeze-thaw cycles,the mass loss of mortar specimens with admixtures is less than 2%,which is lagged compared with the compressive strength loss;Based on the gray correlation analysis,the impact of expansion agent on the mechanical properties of mortar specimens under different freeze-thaw cycles is the lowest.However,with the addition of defoaming agent,the physical and mechanical properties of mortar specimens are more sensitive to freeze-thaw damage,and the sensitivity will increase with the increase of defoaming agent contents;From the microstructure analysis,the addition of expansion agent can improve the stability of internal C-S-H gel system after freeze-thaw action. |
|---|---|
| ISSN: | 1001-9235 |