[1]张秀芝,孙伟,戎志丹,等.活性矿物掺合料对超高性能水泥基材料的影响[J].深圳大学学报理工版,2008,25(4):338-344.
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活性矿物掺合料对超高性能水泥基材料的影响()
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《深圳大学学报理工版》[ISSN:1000-2618/CN:44-1401/N]

卷:
第25卷
期数:
2008年4期
页码:
338-344
栏目:
材料科学
出版日期:
2008-10-31

文章信息/Info

Title:
Influence of reactive mineral admixtures on microstructure of ultra-high performance cementitious composites
文章编号:
1000-2618(2008)04-0338-07
作者:
张秀芝孙伟戎志丹张倩倩
东南大学材料科学与工程学院,江苏省土木工程材料重点试验室,南京 211189
Author(s):
ZHANG Xiu-zhi, SUN Wei, RONG Zhi-dan,and ZhANG Qian-qian
关键词:
超高性能水泥基复合材料微观结构粒径分布界面过渡区
Keywords:
ultra-high performance cementitious compositesmicrostructureparticle size distributioninterfacial transition zone
分类号:
TU 528
文献标志码:
A
摘要:
通过复掺粉煤灰和硅灰,制备一种抗压强度超过200 MPa的超高性能水泥基复合材料(UHPCC),采用扫描电镜、微区能谱分析、X射线衍射、汞压入法和差示扫描量热分析等现代测试手段,研究了活性矿物掺合料对UHPCC微观结构及性能的影响.实验结果表明, UHPCC水泥石主要以低mCa/mSi、 结构致密的C-S-H凝胶和许多未水化颗粒组成;活性矿物掺合料的火山灰效应使水泥浆体与集料间界面过渡区得以改善;矿物掺合料的微集料效应使体系颗粒级配优化,致使基体内部结构致密,总孔隙率减小,孔尺寸得到细化,孔结构得以优化,材料性能得以提高.
Abstract:
The ultra high performance cementitious composites (UHPCC) containing high volume fraction of binary reactive mineral admixtures (silicon fume and fly ash),whose compressive strength exceeded 200 MPa,was prepared.The hydration products,microstructure and pore-structure of UHPCC are investigated by X-ray diffraction (XRD),differential scanning calorimetric-thermogravimetry(DSC),scanning electron microscope(SEM),energy dispersion X-ray analysis(EDSA) and mercury intrusion porosimetry (MIP).The mechanism of ultra-high performance in UHPCC is discussed.The results show that the hardened matrix is mainly composed of unhydrated cementitious particles and dense C-S-H gel with low Ca/Si ratio.The pore structure in hardened matrix is optimized.The diameter of the pores is less than 30 nm.The Interfacial Transition Zone(ITZ) between matrix and aggregate is improved by the pozzolanic reaction and micro-filling effect of mineral admixtures.The amount of calcium hydroxide (CH) crystal in these ITZs is less than that in the ordinary concrete.The sound composition and the compact microstructure of the hydration products give the excellent mechanical properties of UHPCC.

参考文献/References:



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备注/Memo

备注/Memo:
收稿日期:2008-03-14;修回日期:2008-07-01
基金项目:国防科工委国防基础“十一五”资助项目(A1420060186)
作者简介:张秀芝(1974-),女(汉族),黑龙江省佳木斯市人,东南大学博士研究生.E-mail:zhangxz74@126.com
通讯作者:孙伟(1935-),女(汉族),中国工程院院士,东南大学教授、博士生导师.E-mail:sunwei@seu.edu.cn
更新日期/Last Update: 2008-11-26