[1]蒋亚清,高建明,许仲梓.环境友好型PFA膨胀剂[J].东南大学学报(自然科学版),2008,38(2):351-354.[doi:10.3969/j.issn.1001-0505.2008.02.033]
 Jiang Yaqing,Gao Jianming,Xu Zhongzi.Investigation on environmentally friendly PFA based expansive agent[J].Journal of Southeast University (Natural Science Edition),2008,38(2):351-354.[doi:10.3969/j.issn.1001-0505.2008.02.033]
点击复制

环境友好型PFA膨胀剂()
分享到:

《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
38
期数:
2008年第2期
页码:
351-354
栏目:
材料科学与工程
出版日期:
2008-03-20

文章信息/Info

Title:
Investigation on environmentally friendly PFA based expansive agent
作者:
蒋亚清12 高建明3 许仲梓2
1 河海大学材料科学与工程学院, 南京 210098; 2 南京工业大学材料科学与工程学院, 南京 210009; 3 东南大学材料科学与工程学院, 南京 210096
Author(s):
Jiang Yaqing12 Gao Jianming3 Xu Zhongzi2
1 School of Materials Science and Technology, Hohai University, Nanjing 210098, China
2 School of Materials Science and Technology, Nanjing University of Technology, Nanjing 210009, China
3 School of Materials Scie
关键词:
膨胀剂 环境友好 粉煤灰 钙矾石
Keywords:
expansive agent environmentally friendly fly ash ettringite
分类号:
TU528
DOI:
10.3969/j.issn.1001-0505.2008.02.033
摘要:
为利用粉煤灰中的Al2O3代替天然铝酸盐材料生产膨胀剂,通过化学激发和煅烧制备了预水化粉煤灰(PFA).采用化学萃取法分析了PFA中胶凝性矿物的组成; 根据水泥化学原理配制了PFA膨胀剂(PBEA),采用优选法优化了PBEA的掺量,并针对水泥特性,研究了复合PBEA配方; 通过SEM观察了掺复合PBEA的水泥浆体水化产物形貌.试验结果表明:PFA中的胶凝性矿物为C12A7和C2S; 膨胀剂中PFA与硬石膏适宜的质量比为85:15,掺量达到水泥质量的5.6%~6.0%时,性能指标满足现行标准要求; PBEA在提供补偿收缩的同时,提高了混凝土坍落度经时保持能力; 复合PBEA作为硫铝酸盐类膨胀剂,与水泥水化产物反应形成大量的钙矾石晶体.PBEA可代替以天然铝酸盐矿物为原料生产的膨胀剂用于补偿混凝土收缩.
Abstract:
In order to make use of Al2O3 in fly ash as a substitute for natural aluminate materials to manufacture concrete expansive agent, a kind of pro-hydrated fly ash(PFA)was made by chemical activation and calcination. Cementitious minerals of PFA were leached and quantificationally analyzed, thereby the mixture of PFA based expansive agent(PBEA)was made up according to principles of cement chemistry, and dosage of PBEA was optimized through optimum seeking method. Based on characteristics of cement, recipe of combined PBEA was experimentally researched, and microstructures of hydration products of cement pastes containing combined PBEA were observed by SEM. It is indicated that cementitious minerals of PFA are C12A7 and C2S, and that the appropriate mass ratio of PFA to anhydrite in PBEA is 85:15. Properties of PBEA can meet the needs of current standard when its dosage in concrete is more than 5.6%-6.0%. Combined PBEA can not only compensate shrinkage of concrete but also enhance slump retention ability of concrete. As sulfoaluminate type expansive agent, combined PBEA may hydrate with cement hydration products to form plenty of ettringite crystals. Therefore, PBEA can be a substitute for expansive agent made of natural aluminate materials to compensate shrinkage of concrete.

参考文献/References:

[1] Yan Peiyu,Zheng Feng,Peng Jiang,et al.Relationship between delayed ettringite formation and delayed expansion in massive shrinkage-compensating concrete [J]. Cement & Concrete Composites,2004,26(6):687-693.
[2] Collepardi M,Borsoi A,Collepardi S,et al.Effects of shrinkage reducing admixture in shrinkage compensating concrete under non-wet curing conditions [J]. Cement & Concrete Composites,2005,27(6):704-708.
[3] Sun Z,Ye G,Shah S P.Microstructure and early-age properties of Portland cement paste-effects of connectivity of solid phases [J].ACI Materials Journal,2005,102(2):122-129.
[4] Holt E.Contribution of mixture design to chemical and autogenous shrinkage of concrete at early ages [J].Cement and Concrete Research,2005,35(4):464- 472.
[5] Bentz D P,Stutzman P E.Curing,hydration,and microstructure of cement paste [J]. ACI Materials Journal,2006,103(5):348-356.
[6] Cody A M,Lee H,Cody R D,et al.The effects of chemical environment on the nucleation,growth,and stability of ettringite [Ca3Al(OH)6] 2(SO4)326H2O [J].Cement and Concrete Research,2004,34(5):869-881.
[7] Konik Z,Mal/olepszy J,Roszczynialski W,et al.Production of expansive additive to portland cement [J]. Journal of the European Ceramic Society,2007,27(2):605-609.
[8] Lura P,Pease B,Mazzotta G B,et al.Influence of shrinkage-reducing admixtures on development of plastic shrinkage cracks [J].ACI Materials Journal,2007,104(2):187-194.
[9] Rongbing B,Jian S.Synthesis and evaluation of shrinkage-reducing admixture for cementitious materials [J].Cement and Concrete Research,2005,35(3):445-448.
[10] Rouse J M,Billington S L.Creep and shrinkage of high-performance fiber-reinforced cementitious composites [J]. ACI Materials Journal,2007,104(2):129-137.

备注/Memo

备注/Memo:
作者简介: 蒋亚清(1963—),男,博士生,教授级高级工程师; 许仲梓(联系人), 男,博士,教授,博士生导师,zzxu@nut. edu. cn.
基金项目: 江苏省专项资金资助项目(BM2004517).
引文格式: 蒋亚清,高建明,许仲梓.环境友好型PFA膨胀剂[J].东南大学学报:自然科学版,2008,38(2):351-354.
更新日期/Last Update: 2008-03-20