首页期刊信息编委及顾问期刊发行联系方式使用帮助常见问题ENGLISH
位置:首页 >> 正文
氧化镁膨胀剂对混凝土长期体积变化的影响
作者:曹丰泽 阎培渝 
单位:(清华大学土木工程系 北京 100084) 
关键词:氧化镁膨胀剂 混凝土 限制膨胀率 长期稳定性 活性 
分类号:TU528
出版年,卷(期):页码:2018,46(8):1126-1132
DOI:
摘要:
观察了外掺不同活性、不同剂量氧化镁膨胀剂混凝土的限制膨胀率曲线,并结合混凝土强度发展和绝热温升特性,补偿收缩胶砂试件的限制及自由膨胀率,分析了不同活性氧化镁膨胀剂的补偿收缩特性。结果表明:适量掺加氧化镁膨胀剂对于补偿收缩混凝土的强度发展基本没有影响,但导致混凝土的温升值较大,温升开始时间延迟。在氧化镁膨胀剂的常用掺量为6%~8%时,导致混凝土的绝热温升增加值约为3~4 ℃。氧化镁膨胀剂的活性越低,用其制备的补偿收缩混凝土的早期膨胀率越小,但最终膨胀量越大,膨胀稳定期出现越晚,采用“S”型膨胀剂时直到140 d膨胀仍未停止,因而容易造成混凝土结构的后期安定性不良。实际应用时应尽量选用高活性、大掺量的氧化镁膨胀剂,掺量宜控制在6%~8%。
基金项目:
作者简介:
参考文献:
[1] 许莹. 多因素作用下的大体积混凝土裂缝产生原因及控制机理研究[D]. 淮南. 安徽理工大学, 2017.
XU Ying. Study on the causes and control mechanism of cracks in mass concrete under the influence of multi factors (in Chinese, dissertation). Huainan: Anhui Univ Sci Tech, 2017.
[2] 陈兴湘. 混凝土裂缝的成因与控制[J]. 江西建材, 2017, 210(9): 107–111.
CHEN Xingxiang. Jiangxi Build Mater (in Chinese), 2017, 210(9): 107–111.
[3] 鲁统卫, 郑国峰, 郭蕾, 等. 超长大面积无梁楼盖板的施工技术//第四届全国混凝土膨胀剂学术交流会论文集[C]. 深圳, 2006(11): 219–220.
LU Tongwei, ZHENG Guofeng, GUO Lei, et al. The Proceedings of Forth Symposium on Concrete Expansion Agent. Shenzhen, 2006(11): 219–220.
[4] 刘立, 朱鹥佳, 朱洪杰, 等. 北京工业大学第三教学楼超长结构的抗裂施工技术//第四届全国混凝土膨胀剂学术交流会论文集[C]. 深圳, 2006(11): 409–410.
LIU Li, ZHUYijia, ZHU Hongjie, et al. The Forth Session of the National Academic Symposium of Concrete Expansion Agent[C]. Shenzhen, 2006(11): 409–410.
[5] 王世伟. 钢管混凝土结构的特性和研究现状[J]. 安徽建筑, 2003(6): 64–66.
WANG Shiwei. Anhui Arch (in Chinese), 2003(6): 64–66.
[6] 董兰女, 程占莲, 李弘飞. HL-HGM高强无收缩灌浆料性能及其应用实践//第四届全国混凝土膨胀剂学术交流会论文集[C]. 深圳, 2006(11): 626–629.
DONG Lannv, CHENG Zhanlian, LI Hongfei. The Forth Session of the National Academic Symposium of Concrete Expansion Agent, Shenzhen, 2006(11): 626–629.
[7] 莫立武, 邓敏. 氧化镁膨胀剂的研究现状[J]. 膨胀剂与膨胀混凝土, 2010(1): 1–9.
MO Liwu, DENG Min. Expan Agent Expan Concr(in Chinese), 2010(1): 1–9.
[8] YAN P, QIN X, YANG W et al. The semiquantitative determination and morphology of ettringite in pastes containing expansion agent cured in elevated temperature[J]. Cem Concr Res, 2001, 31: 1285–1290.
[9] YAN P, QIN X. The effect of expansive agent and possibility of delayed ettringite formation in shrinkage –compensating massive concrete[J]. Cem Concr Res, 2001, 31: 335–337.
[10] CHATTERJI S. Mechanism of expansion of concrete due to the presence of dead-burnt CaO and MgO[J]. Cem Concr Res, 1995, 25(1): 51–56.
[11] 邓敏, 崔雪华, 刘元湛, 等. 水泥中氧化镁的膨胀机理[J]. 南京化工学院学报, 1990, 12(4): 1–11.
DENG Min, CUI Xuehua, LIU Yuanzhan, et al. J. Nanjing Inst Chem Tech (in Chinese), 1990, 12(4): 1–11.
[12] 李承木. 氧化镁混凝土自生体积变形的长期试验研究成果[J]. 水力发电学报, 1999, 65: 11–20.
LI Chengmu. J Hydroelectr Eng (in Chinese), 1999, 65: 11–20.
[13] 曹泽生, 徐锦华. 氧化镁混凝土筑坝技术[M]. 北京: 中国电力出版社, 2003.
[14] 陈昌礼, 李承木. 氧化镁混凝土的研究与应用[J]. 混凝土, 2006(5): 45–47.
CHEN Changli, LI Chengmu. Concrete (in Chinese), 2006(5): 45–47.
[15] MO L, DENG M, TANG M. Effects of calcination condition on expansion property of MgO-type expansive agent used in cement-based materials[J]. Cem Concr Res, 2010, 40(3): 437–446.
[16] CHEN X, YANG H, LI W. Factors analysis on autogenous volume deformation of MgO concrete and early thermal cracking evaluation[J]. Constr Build Mater, 2016, 118: 276–285.
[17] LEA F M. The Chemistry of Cement and Concrete[M]. New York: Chemical Publishing Company, 1971.
[18] 中华人民共和国国家质量检验检疫总局. GB 175-2007/XG 1-2009, 通用硅酸盐水泥[S]. 2009. 
[19] BS EN 197-1: 2000, Cement-Part 1: Composition, Specifications and Conformity Criteria for Common Cements[S]. 2007.
[20] ASTM C150M-12, Standard Specification for Portland Cement[S]. 2012.
[21] 曹丰泽, 阎培渝. 活性与养护温度对氧化镁膨胀剂膨胀性能的影响[J]. 硅酸盐学报, 2017, 45(8): 1088–1095.
CAO Fengze, YAN Peiyu. J Chin Ceram Soc, 2017, 45(8): 1088–1095.
[22] ZHANG Runxiao, PANESAR D K. New approach to calculate water film thickness and the correlation to the rheology of mortar and concrete containing reactive MgO[J]. Constr Build Mater, 2017, 150: 892–902.
[23] DING W, TAN K, LIU L, et al. Utilization of light calcined magnesite tailings to compensate the autogenous shrinkage of steam-cured cement paste[J]. Adv Cem Res, 2016, 28(10): 675–686.
[24] MO L, LIU M, ABIR A, et al. Deformation and mechanical properties of quaternary blended cements containing ground granulated blast furnace slag, fly ash and magnesia[J]. Cem Concr Res, 2015, 71(05): 7–13.
[25] SHERIR M A A, HOSSAIN K M A, LACHEMI M. Self-healing and expansion characteristics of cementitious composites with high volume fly ash and MgO-type expansive agent[J]. Constr Build Mater, 2016, 127: 80–92.
 
服务与反馈:
文章下载】【加入收藏
中国硅酸盐学会《硅酸盐学报》编辑室
京ICP备10016537号-2
京公网安备 11010802024188号
地址:北京市海淀区三里河路11号    邮政编码:100831
电话:010-57811253  57811254    
E-mail:jccs@ceramsoc.com