期刊文献+

不同龄期的高流态自养护泵送混凝土性能的试验研究 被引量:8

Experimental Study on Performance of High Flowing Self-curing Condition Pump Concrete at Different Ages
下载PDF
导出
摘要 采用P.O 42.5级水泥、高吸水性树脂、聚羧酸系高效减水剂、粉煤灰等原料配制了强度等级是C50的高流态泵送混凝土,浇筑成型后试块直接堆放在湿度为60%、平均温度为15℃的环境中进行了自然条件下的养护。试验分别测定新拌混凝土的坍落度和1 h坍损,以及不同龄期混凝土的力学性能,并利用SEM等方法对水泥石微观结构的进行了分析。试验结果表明,0.10%~0.14%掺量的高吸水性树脂能显著改善大掺量高效减水剂(掺量为1.0%时)引起的混凝土泌水和坍损过大的现象;且高吸水性树脂的掺入完全能实现混凝土在自养护条件下强度的发展,1 y龄期的、高吸水性树脂掺量0.18%以上的自养护试件强度可达85 MPa以上。SEM结果表明,高吸水性树脂吸水后呈胶态均匀分布在混凝土中,完全释水干燥后形成片状薄膜均匀分布在水化硅酸钙中。 C50 high flowing pump concrete was prepared by using the P. 0 42.5 cement, high water absorbent resin, polycarboxylate superplasticizer, fly ash and other raw materials. After pouring molding, the test blocks were stored directly under conditions of natural conservation which the humidity was 60% and the average temperature was 15 ℃. Slump of freshly mixed concrete, slump loss after lh, and the mechanical properties of concrete at different ages were tested. Cement microstructure were analyzed by SEM. The results show that 0. 10%-0. 14% volume of high water absorbent resin can significantly improve the phenomenon of concrete bleeding and excessive slump loss caused by the large amount of superplasticizer(when the dosage is 1.0% ). Concrete strength development was fully realized under self- curing conditions. At the age of ly, strength of the concrete which was added into 0.18% above volume of high water absorbent resin was more than 85 MPa. According to the results of SEM, high water absorbent resin was jelly in fresh concrete, and it would be form the sheet film which evenly distributed in the hydrated calcium silicate after completely releasing water.
出处 《硅酸盐通报》 CAS CSCD 北大核心 2013年第4期623-629,共7页 Bulletin of the Chinese Ceramic Society
基金 河北省教育厅自然科学重点项目(ZD2010202)
关键词 泵送混凝土 高吸水性树脂 坍落度 自养护 不同龄期 pump concrete high water absorbent resin slump self-curing different ages
  • 相关文献

参考文献8

二级参考文献26

  • 1张晏清.砼的泵送压力与压力泌水[J].混凝土与水泥制品,1995(5):26-28. 被引量:13
  • 2王迎飞,黄雁飞.减缩剂对高性能砼收缩开裂性能影响的研究[J].硅酸盐通报,2006,25(3):189-193. 被引量:9
  • 3詹炳根,丁以兵.超强吸水剂对混凝土早期内部相对湿度的影响[J].合肥工业大学学报(自然科学版),2006,29(9):1151-1154. 被引量:33
  • 4POWERS T C.Studies of workability of concrete[J].Jour ACI, 1932(3): 419.
  • 5Richard P. Composition of reactive powder concrete[ J]. Cement and Concrete Research, 1995,7( 1 ) :1501-1511.
  • 6马新伟,李学英,焦贺军,等.超强吸水聚合物在砂浆与混凝土中的应用研究[C].第六届全国高强与高性能混凝’土学术交流会论文汇编.2007:82-88.
  • 7Tazawa E. Autogenouse shrinkage of concrete [ M ]. New York: E and FN spon, 1988:3.
  • 8Mak S L,Torii K. Strength development of high strength of ultra high-strength concrete subjected to high hudration temperature [ J ]. CCR, 1995, 25 ( 8 ) : 1791-1802.
  • 9安明吉吉.高性能混凝土的白收缩问题.建筑材料学报,2011,(6):159-166.
  • 10郭毅霖.水泥基胶凝材料自收缩性能的研究[D].北京:北京工业大学硕士学位论文.

共引文献70

同被引文献84

引证文献8

二级引证文献31

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部