Compressive Strength and Microstructural Characteristics of Natural Zeolite-Based Geopolymer

被引:25
|
作者
Ozen, Sevgi [1 ]
Alam, Burhan [2 ]
机构
[1] Recep Tayyip Erdogan Univ, Fac Engn, Ind Design Engn, TR-53100 Fener Rize, Turkey
[2] Middle East Tech Univ, Fac Engn, Civil Engn Dept, TR-06000 Ankara, Turkey
来源
PERIODICA POLYTECHNICA-CIVIL ENGINEERING | 2018年 / 62卷 / 01期
关键词
natural zeolite; geopolymer; compressive strength; microstructural characteristics; FLY-ASH; TEMPERATURE; CEMENT; METAKAOLIN;
D O I
10.3311/PPci.10848
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
A detailed study of geopolymeric reaction products and mechanical properties of geopolymer pastes prepared with natural zeolite has been investigated by means of compressive strength, XRD and SEM/EDX analysis. Sodium silicate and sodium hydroxide solutions are used as an alkaline activator. The results of the investigation show that the activator ratio plays an important role on the mechanical development of geopolymer pastes. The geopolymeric gel and CSH phase with a low Ca/Si ratio are found as the main reaction product. The increased intensity of CSH phase has a significant effect on the improvement of the compressive strength. Decreased intensity of clinoptilolite and totally consumed clay mineral upon geopolymerization proves the involvement of the aluminosilicate phases in the geopolymeric reaction. The existence of sodium and increment of Si/Al ratio with respect to original zeolitic tuff were detected. The results also show that the investigated natural zeolite, which is emerged as an environmentally friendly, low-cost material, is suitable for the production of geopolymer cement.
引用
收藏
页码:64 / 71
页数:8
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