干旱区生态环境知识资源中心(Arid): Study on the Activity of Aeolian Sand Powder and Alkali Excitation Modification

Arid

DOI	10.1007/s11837-018-3163-y
	Study on the Activity of Aeolian Sand Powder and Alkali Excitation Modification
	Li, GenFeng; Shen, XiangDong; Yuan, Qi; Zou, YuXiao; Xiong, Lu
通讯作者	Li, GenFeng
来源期刊	JOM
ISSN	1047-4838
EISSN	1543-1851
出版年	2019
卷号	71 期号:3 页码:984-994
英文摘要	Aeolian sand powder samples were made from aeolian sand which was obtained from the Kubuqi Desert of Inner Mongolia, China. With the method of boiling, the effects of different mass fraction sodium sulfate and sodium hydroxide on the dissolution of active substances of aeolian sand powder were studied. Meanwhile, based on the alkali activation theory, the type of activator, the quality fraction and the pre-curing temperature were shown to be variable, and the effect of aeolian sand powder modification is discussed through the test of the strength of aeolian sand powder-cement mortar. Micro-methods such as the total spectral semi-quantitative analysis, x-ray diffraction, field emission scanning electron microscopy, and nuclear magnetic resonance technology were used to study the mineral composition, microstructure and pore characteristics, and then to discuss the feasibility of aeolian sand powder as an alkali-activated material. The results showed that sodium sulfate had a better activation effect on the aeolian sand powder compared with that of sodium hydroxide. The activation rate of aeolian sand powder increases with the increase of the mass fraction of the activator, and, with the increase of the alkalinity of the solution, the dissolution of SiO2 and other active substances in the aeolian sand powder increases gradually. The effect of sodium sulfate on the aeolian sand powder is better than that of sodium hydroxide, and when the mass fraction of sodium sulfate is 2%, the volume of the aeolian sand powder is 15%. When the pre-curing temperature is 35 degrees C, the modification effect of aeolian sand powder is better and the activity index reaches 108.2%. Under the effects of the sodium sulfate, 2.2% and 2.6% active SiO2 and CaO were, respectively, dissolved from the aeolian sand powder. Then, a polymerization reaction occurred under the combined action of the temperature, which generated the needle-shaped hydration product ettringite with a good development state. Meanwhile, the ratio of the inner 20-nm hole of the aeolian sand powder-cement mortar specimen reached 85.69%, and there were many disconnected capillary pores, the irreducible fluid saturation was as high as 94.311%, and the gelling property was good.
类型	Article
语种	英语
国家	Peoples R China
收录类别	SCI-E
WOS记录号	WOS:000458866900015
WOS关键词	POZZOLANIC MATERIAL ; CEMENT ; BEHAVIOR ; TRENDS ; WATER
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering ; Mineralogy ; Mining & Mineral Processing
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering ; Mineralogy ; Mining & Mineral Processing
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/216583
作者单位	Mongolia Agr Univ, Coll Water Conservancy & Civil Engn Inner, Hohhot 010018, Peoples R China
推荐引用方式 GB/T 7714	Li, GenFeng,Shen, XiangDong,Yuan, Qi,et al. Study on the Activity of Aeolian Sand Powder and Alkali Excitation Modification[J],2019,71(3):984-994.
APA	Li, GenFeng,Shen, XiangDong,Yuan, Qi,Zou, YuXiao,&Xiong, Lu.(2019).Study on the Activity of Aeolian Sand Powder and Alkali Excitation Modification.JOM,71(3),984-994.
MLA	Li, GenFeng,et al."Study on the Activity of Aeolian Sand Powder and Alkali Excitation Modification".JOM 71.3(2019):984-994.