| RESEARCH PAPER |
|
|
|
|
|
| Effect of Mineral Admixtures Incorporation on Frost Resistance of Geopolymer |
| LI San1,2, PENG Xiaoqin1, GOU Jing1, ZHOU Gan1, HUANG Ting1, CHEN Yang1,WANG Shuping1
|
1 College of Materials Science and Engineering, Chongqing University, Chongqing 400045;
2 Chongqing Liufang Construction Engineering Quality Detection Limited Company, Chongqing 401346 |
|
|
|
|
Abstract Geopolymer concrete was prepared with metakaolin and alkali-activator. The compressive strength and frost resis-tance of geopolymer concrete with a dosage of steel slag, slag or fly ash of 15% was studied and the vacuum volume aspiration ratio of geopolymer concrete was tested. XRD, SEM and DSC-TG analyses were used to investigate the effect of mineral admixtures incorporation on the microstructures and hydration products of geopolymer. The results showed that the compressive strength of geopolymer concrete is effectively improved by steel slag or slag, but the fly ash could make it slightly decrease. The poor resistance of frost can be attributed to the pores and microcracks exist on the surface of geopolymer. The adding of steel slag or slag forms the hydration products such as C-S-H, C-A-S-H gel which fill in the pores can delay its rate of destruction induced by the cycle of freezing and thawing and improve the frost resistance of geopolymer, it maintains relative strength in 90% after 5 freeze-thaw cycles. The fly ash reduces the water consumption to prepare concrete and the unhydrated fly ash particles embedded in the structure contributes to the improvement of density and frost resistance, as the geopolymer concrete maintained 86.9% strength after 5 freeze-thaw cycle, and 79.7% for the control group.
|
|
Published: 25 May 2018
Online: 2018-07-06
|
|
|
|
|
1 Davidovits J. Early high-strength mineral polymer: US,4509985[P].1985-04-09.
2 Davidovits J.Genpolymers: Inorganic polymeric new materials [J]. Journal of Thermal Analysis,1991,37:1633.
3 Li Z, Zhu D, Zhang Y S. Development of sustainable cementitious materials[C]∥International Workshop on Sustainable Development and Concrete Technology. Beijing,2004.
4 Duxson P, Provis J L, Lukey G C, et al. The role of inorganic polymer technology in the development of ‘green concrete’[J]. Cement and Concrete Research,2007,37:1590.
5 Dai Xinxiang, Wen Ziyun. Study state of geopolymeric cement and its application[J].Cement,2001(10):11(in Chinese).
代新祥,文梓芸.土聚水泥的应用及研究现状[J].水泥,2001(10):11.
6 Yang Wencui. Effect of inorganic salts on pore structure and frost resistance of concrete[D]. Harbin: Harbin Institute of Technology,2009(in Chinese).
杨文萃.无机盐对混凝土孔结构和抗冻性影响的研究[D].哈尔滨:哈尔宾工业大学,2009.
7 文梓芸,钱春香,等.混凝土工程与技术[M].武汉:武汉理工大学出版社,2004:38.
8 Deventer J S J V,Provis J L, Duxson P, et al. Chemical research and climate change as drivers in the commercial adoption of alkali activated materials[J]. Waste Biomass Valor,2010,1:145.
9 Li Kuan, Lu Duyou, Li Menghao, et al. Effect of water content on microstructure and reaction process of metakaolin-based geopolymers[J]. Journal of the Chinese Ceramic Society,2016,44(2):226(in Chinese).
李款,卢都友,李孟浩,等.用水量对偏高岭土基地聚合物微观结构及反应过程的影响[J].硅酸盐学报,2016,44(2):226.
10 杨南如,岳文海.无机非金属材料图谱手册[M].武汉:武汉工业大学出版社,2000:235. |
|
|
|
渝公网安备50019002502923号 © Editorial Office of Materials Reports.
2018, Vol. 32 
