根据干海子大桥冬期混凝土施工要求和现场原材料特性，采用亚硝酸钠与乙二醇形成有机、无机协同防冻，设计制备出流动性好、包裹性佳、自密实的抗冻钢管混凝土。并通过现场实验，结合 SEM观测，研究了其在低温浇筑与养护、后期升温后强度的发展规律。结果表明，低温条件成型的钢管混凝土短柱与核心混凝土试件，早期强度发展较好，后期温度回升后强度能稳定增长。设计制备的钢管混凝土具有很好的低温工作性能和力学性能，抗冻性能优越，能满足依托工程冬季钢管混凝土施工质量要求。
According to winter concrete construction requirements and raw materials properties of Ganhaizi bridge,sodium nitrite and ethylene glycol were used to form organic and inorganic coordination antifreeze,frost resistance core concrete with outstanding package,excellent fluidity and good self-compacting ability was pre-pared.The laws of later strength evolution of concrete filled steel tube which pouring and maintenance at low temperature were investigated.Scanning electron microscope (SEM)was used to analyze the micro-morphology features of core concrete.It was confirmed that core concrete and concrete filled steel tube short column which manufactured at the low-temperature have a high early strength,and the later strength would steady grow when the temperature rise.The concrete prepared have prominent working performance and mechanical properties at low temperature,and good frost resistance,which would meet the winter concrete construction requirements of Ganhaizi bridge.
参考文献
| [1] | Kamal H K.Frost durability of concrete containing vis-cosity-modifying admixture[J].ACI MATERIALS JOURNAL,1995(92):625-633. |
| [2] | 杨英姿,巴恒静.负温防冻剂混凝土的界面显微结构与性能[J].硅酸盐学报,2007(08):1125-1130. |
| [3] | Sha Ke;Li Jiahe.Property and micro structure of con-crete with antifreezing agent and expanding agent[J].China Concrete,2011(20):78-81. |
| [4] | Wen Jing;Li Jiahe;Zhu Weizhong.Effect of early strength component and antifreeze component on the per-formance of HCSA expansion agent at low temperature[J].Expansive Agents & Expansive Concrete,2008(02):40-43. |
| [5] | 杨英姿,高小建,邓宏卫,巴恒静.自然变负温养护和恒负温养护对混凝土强度的影响[J].低温建筑技术,2009(04):1-4. |
| [6] | Seong-Tae Yi;Sue-Won Pae;Jin-Keun Kim .Minimum curing time prediction of early-age concrete to prevent frost damage[J].Construction and Building Materials,2011(3):1439-1449. |
| [7] | Changwen Miao;Ru Mu;Qian Tian .Effect of sulfate solution on the frost resistance of concrete with and without steel fiber reinforcement[J].Cement and Concrete Research,2002(1):31-34. |
| [8] | Chen Yunhong;Wang Hongwei.Test and research on frost resistance of fiber reinforced concrete[J].Highway,2012(03):179-181. |
| [9] | Zhigniew R.A mechanism of expansion of concrete aggre-gate due to frost action[J].Cement and Concrete Re-search,1991(21):614-624. |
| [10] | 丁庆军,周孝军,牟廷敏,范碧琨,延亚林.钢纤维增韧微膨胀钢管混凝土界面粘结性能研究[J].功能材料,2013(06):809-813. |
| [11] | 丁庆军,刘荣进,牟廷敏,宋晓波.钢纤维增韧自密实微膨胀钢管混凝土[J].东南大学学报（自然科学版）,2010(z2):10-14. |
| [12] | Mou Tingmin;Zhou Xiaojun.Frost resistance of steel fi-ber reinforced micro-expansive concrete filled steel tube[J].Applied Mechanics and Materials,2012(204-208):3956-3960. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%