碱激发粉煤灰地聚物的力学性能及微观机制研究

doi:10.11896/cldb.20100278

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Abstract The waste residue of power industry can be regenerated into a new kind of green high-performance inorganic polymer cementitious material by alkali stimulation. The fly ash geopolymers were prepared from first grade low calcium fly ash as raw materials, sodium hydroxide as composite alkaline activator, and the influence of the modulus and curing age of alkali activator on the physical properties of fly ash geopolymers was studied through unconfined compressive strength(UCS) test, X-ray diffraction test and scanning electron microscope test. The test results show that the modulus of the exciter is an important factor affecting the mechanical properties of the geopolymer samples. With the increase of modulus, the UCS of the samples first increases and then decreases. When the modulus is 1.1 at each curing age, the UCS of the samples is the highest. Under the erosion and destruction of alkaline solution, fly ash vitreous occurs through depolymer-polycondensation reaction, and the N-A-S-H gel generated fills the pores of the sample, which promotes the increase of the UCS of the sample. When the modulus is 1.1 and the curing period is 28 days, the UCS of the sample reaches the maximum value of 10.3 MPa and the microstructure of the sample is compact and integral.

Key words： fly ash stimulant modulus curing age

Published: 25 February 2022 Online: 2022-02-28

CLC number:

TU526

Fund:Qinghai Province Science and Technology Plan Project (2020-ZJ-738), the National Natural Science Foundation of China (51768060) and the Technology Innovation Service Platform of Qinghai Province.

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	Articles by authors
	TONG Guoqing
	ZHANG Wuyu
	GAO Yiting
	TANG Xiongyu

Cite this article:

TONG Guoqing,ZHANG Wuyu,GAO Yiting, et al. Mechanical Properties and Micromechanism of Alkali-activated Fly Ash Geopolymer[J]. Materials Reports, 2022, 36(4): 20100278-6.

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http://www.mater-rep.com/EN/10.11896/cldb.20100278 OR http://www.mater-rep.com/EN/Y2022/V36/I4/20100278

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