Study on Strength and Pore Structure Properties of Biochar Cement Mortar Based on Nuclear Magnetic Resonance Technology
XUE Cuizhen*, LI Xiaoke, SU Li, FENG Qiong, QIAO Hongxia
1 School of Civil and Hydraulic Engineering, Lanzhou University of Technology, Lanzhou 730050, China; 2 Western Advanced Civil Engineering Materials Innovation Research Center, Lanzhou 730050, China; 3 Gansu Advanced Civil Engineering Materials Engineering Research Center, Lanzhou 730050, China; 4 Gansu Research Base of State Key Laboratory of High Performance Civil Engineering Materials, Lanzhou 730050, China
Abstract: In response to the carbon emission issues of cement and cement-based materials under the dual carbon goals, using corn stalk biochar as the raw material, this study quantitatively characterized the effects of biochar dosage (5%, 8%, 12%, 15%) and grinding time (10 min, 20 min, 30 min) on the pore distribution characteristics and strength of cement-based materials based on the research of its basic properties, with the aid of nuclear magnetic resonance technology. The complexity and uniformity of the pore structure of biochar-containing cement-based mate-rials were evaluated through the fractal dimension theory. Finally, the significance of the influence of pore size distribution and porosity on the compressive strength of specimens was quantitatively analyzed based on the grey entropy correlation degree theory. The results show that after grinding, the biochar particles are all smaller than cement, and the particle size is mainly concentrated in the range of 1—10 μm. With the extension of grinding time, the content of fine particles gradually increases, and the particle fineness gradually increases. When the biochar dosage is relatively low (not more than 8%), it has a relatively small impact on the early compressive strength of cement mortar; when the biochar dosage is too high (more than 8%), it will significantly reduce the early strength of cement mortar, but the 90 day compressive strength is slightly higher than that of the reference mortar. The results of nuclear magnetic resonance show that with the increase of dosage and grinding time, the 28 day porosity of the specimens generally shows an upward trend, and the T2 spectrum curve mainly shows an increase in the number of micro-pores in the specimens, among which the proportion of gel pores has the most significant impact on the compressive strength of mortar. The results of fractal dimension show that the fractal characteristics of the pore structure of biochar-containing cement mortar are significant. Except for a few mix ratios, the fractal dimensions of large pores and the overall curve increase with the increase of dosage and grinding time. The research results can provide theoretical value for the promotion and application of biochar in cement-based materials and contribute to the national strategy of carbon peaking and carbon neutrality.
薛翠真, 李肖克, 苏丽, 冯琼, 乔宏霞. 基于核磁共振技术的生物炭水泥砂浆强度及孔结构性能研究[J]. 材料导报, 2026, 40(5): 25060140-8.
XUE Cuizhen, LI Xiaoke, SU Li, FENG Qiong, QIAO Hongxia. Study on Strength and Pore Structure Properties of Biochar Cement Mortar Based on Nuclear Magnetic Resonance Technology. Materials Reports, 2026, 40(5): 25060140-8.
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