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BULLETIN OF THE CHINESE CERAMIC SOCIETY ›› 2022, Vol. 41 ›› Issue (9): 3148-3153.

• Solid Waste and Eco-Materials • Previous Articles     Next Articles

Effect Mechanism of Curing Temperature on Mechanical Properties of Tuff-Based Cementitious Materials

ZHANG Ping, MA Xudong, HAN Shijie, GU Longlong, WANG Zhangyan   

  1. China Construction Western Construction Xinjiang Co., Ltd., Urumqi 830000, China
  • Received:2022-05-11 Revised:2022-06-29 Online:2022-09-15 Published:2022-09-27

Abstract: Tuff is a kind of volcanic ash clastic rock which is scattered on the ground through volcanic eruption and solidified through compaction and hydration cementation, and it has certain pozzolanic activity. In this paper, the effect of curing temperature on the mechanical properties of tuff-based cementitious materials was studied, and the microstructure of hydration products of tuff-based cementitious materials was analyzed by means of FTIR, TG, SEM and MIP. The results show that the increase of curing temperature has a certain promotion and enhancement effect on the mechanical properties of tuff-based cementitious materials, which can not only improve the early strength, but also improve the later strength. The optimal curing temperature of tuff-based cementitious materials is 50 ℃. With the increase of curing temperature, no new hydration products are formed in the tuff-based cementitious material, but the content of hydration products such as AFt and C-S-H increases, and the content of Ca(OH)2 decreases. The increase of curing temperature is beneficial to increase the proportion of gel pores and transition pores in the tuff-based cementitious material, refine the pore size structure, reduce the porosity, and improve the density of matrix structure.

Key words: cementitious material, tuff, mechanical property, pozzolanic activity, curing temperature, pore structure

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