Preparation and Hardening Performance of Ultra-Light Sulphoaluminate Cement-Based Foaming Material

Abstract

Abstract: Aiming at the problems of traditional Portland cement-based foaming materials, such as small expansion ratio, large bulk density and dry density, and long setting time. An ultra-light sulfoaluminate cement-based foaming material (U-SCFM) was prepared using sulfoaluminate cement clinker, lime and hard gypsum as cementitious materials, hydrogen peroxide (H₂O₂) as blowing agent and hydroxypropyl methylcellulose ether (HPMC) as foam stabilizer.The influence of H₂O₂ dosage, HPMC content and water-binder ratio on the expansion ratio, dry density, and hardening strength of U-SCFM were systematically researched. The hydration products and microstructure of U-SCFM hardened body were also characterized by using the ultra-depth-of-field microscope, thermal analysis (TGA), scanning electron microscope (SEM). The results show that when the water-binder ratio is 0.8, H₂O₂ and HPMC content are respectively 10% and 1% of the cementitious materials mass, U-SCFM with an expansion ratio of 4.2, dry density of 265 kg/m³, and 7 d compressive strength of 0.98 MPa is prepared. The thickening effect of HPMC and the rapid setting and hardening of U-SCFM to form ettringite crystals are the main reasons for the formation of the porous structure of the U-SCFM hardened body. The above results provide a green, safe, low-cost filling material for filling the high-collapse area of coal mine tunnels.

Key words: sulphoaluminate cement clinker, filling material, foaming, foam stabilizer, hydrogen peroxide

CLC Number:

TU525

WANG Shang, LIU Songhui, ZHOU Rong, ZHANG Yuehong, ZHANG Haibo. Preparation and Hardening Performance of Ultra-Light Sulphoaluminate Cement-Based Foaming Material[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(3): 723-730.

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