Calcined Attapulgite Clay as Supplementary Cementing Material: Thermal Treatment, Hydration Activity and Mechanical Properties

Tao Shi; Yanming Liu; Yanlin Zhang; Yingjia Lan; Qifan Zhao; Yujing Zhao; Haobo Wang

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자료유형: 학술저널

저자정보: Tao Shi (Zhejiang University of Technology) Yanming Liu (Zhejiang University of Technology) Yanlin Zhang (Zhejiang University of Technology) Yingjia Lan (Zhejiang University of Technology) Qifan Zhao (Zhejiang University of Technology) Yujing Zhao (Zhejiang University of Technology) Haobo Wang (Zhejiang University of Technology)

저널정보: 한국콘크리트학회 International Journal of Concrete Structures and Materials International Journal of Concrete Structures and Materials Vol.16 No.2

발행연도: 2022.3

수록면: 187 - 196 (10page)

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The present paper studied the effects of calcination temperatures (200–800 °C) on the appearance, mineral composition, and active SiO₂ content in attapulgite and investigated the effects of attapulgite before and after calcination on the chemically bonded water content, the degree of reaction of cement paste, and the mechanical properties such as the flexural strength, compressive strength, and splitting-tensile strength of cement mortar. The results indicate that the calcination temperature changes the mineral composition of attapulgite, thereby affecting the hydration activity of cement-based materials. The attapulgite calcined at 500 °C (AT500) has the best enhancement on the hydration activity of cement-based materials. The calcination at 500 °C is most beneficial to the dissolution of SiO₂, and the content of SiO₂ reaches 20.96%. The contents of chemically bonded water in the samples incorporated with calcined attapulgite reduced and that of the samples incorporated with AT500 at 28 d is the same as that of the control group. The reaction degree of AT500 is 78.61% at 28 days. Calcined attapulgite clay can reduce the energy consumption of the cement industry and promote the sustainable development of attapulgite clay.

#attapulgite clay #supplementary cementing material #calcination temperature #hydration activity #mechanical properties

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