Effect of TIPA on mechanical properties and hydration properties of cement-lithium slag system

Ting Zhang; Baoguo Ma; Hongbo Tan; Xiaohai Liu; Pian Chen; Zhongtao Luo

doi:10.1016/j.jenvman.2020.111274

Effect of TIPA on mechanical properties and hydration properties of cement-lithium slag system

J Environ Manage. 2020 Dec 15:276:111274. doi: 10.1016/j.jenvman.2020.111274. Epub 2020 Sep 7.

Authors

Ting Zhang¹, Baoguo Ma², Hongbo Tan³, Xiaohai Liu², Pian Chen², Zhongtao Luo⁴

Affiliations

¹ State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070, China; School of Materials Science and Engineering, Tongji University, Shanghai, 201804, China.
² State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070, China.
³ State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070, China. Electronic address: thbwhut@whut.edu.cn.
⁴ School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450052, China.

PMID: 32911386
DOI: 10.1016/j.jenvman.2020.111274

Abstract

Effect of triisopropanolamine (TIPA) on compressive strength and hydration properties of cement-lithium slag (LS, 30%) paste was studied. The results demonstrated that the addition of TIPA is advantageous for compressive strength at 7 d, 28 d and 60 d. The reason was related to the pore complexity and hydration process of cement and LS. TIPA reduced the total porosity, and increased the fractal dimension, making the pore structure more complicated. In addition, TIPA promoted the pozzolanic reaction of LS and the hydration of cement, expediting the formation of C-S(A)-H gel. TIPA accelerated the dissolution of aluminate ions, silicate ions and ferric ions in the pore solution, thereby accelerating the pozzolanic reaction of LS. During the hydration of cement-LS paste, TIPA facilitated the conversion of ettringite to the AFm-like phase and produced more C-A-S-H gel by promoting the dissolution of aluminate ions.

Keywords: AFm; Aluminate; Compressive strength; Hydration process; Triisopropanolamine.

MeSH terms

Construction Materials
Lithium*
Propanolamines*
Silicates

Substances

Propanolamines
Silicates
Lithium
triisopropanolamine