Hardened Body Preparation and Performance Adjustment of  High Content Phosphogypsum Cementitious Materials

doi:10.16552/j.cnki.issn1001-1625.2025.0049

Abstract

Abstract: In order to prepare high-strength and high content phosphogypsum cementitious materials, the effects of shaping pressure, calcium-silicon-aluminum ratio and alkali activator content on the properties of high content phosphogypsum cementitious materials hardened body were studied. Based on the Box-Behnken design in the response surface method, the interaction mechanism of each influencing factor on the compressive strength was analyzed. In addition, the microstructure of the hardened body was analyzed by X-ray diffraction and scanning electron microscopy. The results show that the long-term performance of the hardened body of phosphogypsum cementitious materials increases first and then decreases with the increase of shaping pressure, calcium-silicon-aluminum ratio and alkali activator content. Through the response surface model analysis, the interaction effect of the influencing factors on the strength development from strong to weak is the shaping pressure, calcium-silicon-aluminum ratio, alkali activator content. When the shaping pressure is 60 MPa, the calcium-silicon-aluminum ratio is 1.1(molar ratio), and the alkali activator content is 0.5‰ (mass fraction), the hardened body of high content phosphogypsum cementitious material with compressive strength exceeding 65 MPa can be prepared. The well-crystallized needle-like ettringite fills the gap between the phosphogypsum particles, and the calcium silicate hydrate (C-S-H) gel wraps the cemented phosphogypsum particles and ettringite crystals to form a dense structure.

Key words: high content phosphogypsum, high compressive strength, mechanical property, response surface method, microstructure

CLC Number:

TU526

LI Yisheng, LYU Wei, WU Chiqiu, YU Zhengkang, HE Jing, SHUI Zhonghe. Hardened Body Preparation and Performance Adjustment of High Content Phosphogypsum Cementitious Materials[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(8): 2944-2954.

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Hardened Body Preparation and Performance Adjustment of High Content Phosphogypsum Cementitious Materials

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