Open Access

ARTICLE

Dynamic Elastic Modulus and Damping Ratio of Lignin-Modified Loess

Qian Wang^1,#,*, Zhaozhao Liu^1,2,#,*, Xiumei Zhong¹, Zhongnan Gao¹, Fuqiang Liu²

1 Key Laboratory of Loess Earthquake Engineering, China Earthquake Administration & Gansu Province, Lanzhou, 730000, China
2 College of Civil Engineering and Mechanics, Lanzhou University, Lanzhou, 730000, China

* Corresponding Authors: Qian Wang. Email: ; Zhaozhao Liu. Email:
# These authors contributed to this work equally and should be regarded as co-first authors

Journal of Renewable Materials 2021, 9(3), 523-540. https://doi.org/10.32604/jrm.2021.014114

Received 01 September 2020; Accepted 19 September 2020; Issue published 14 January 2021

Abstract

To effectively improve the poor engineering properties of loess and enhance its seismic performance, the industrial by-product lignin is used as a modified material. Based on lots of dynamic triaxial tests, the dynamic elastic modulus and damping ratio of lignin-modified loess were tested. The effects of lignin content on the dynamic elastic modulus and damping ratio of lignin-modified loess were analyzed. Combined with scanning electron microscopy (SEM) and X-ray diffraction (XRD), the microscopic mechanism of lignin to improve the dynamic properties of loess was studied. The results show that lignin can effectively modify the dynamic deformation of loess under dynamic load. Under the same dynamic stress condition, the dynamic strain of lignin-modified loess is smaller than compacted loess. The dynamic elastic modulus of modified loess with different lignin content are quite different, but both decrease with the increase of dynamic strain. And the dynamic elastic modulus of modified loess is greater than compacted loess. The maximum dynamic elastic modulus of modified loess with a lignin content of 1% are significantly greater than others. Under the same dynamic strain condition, the damping ratio of lignin-modified loess is smaller than compacted loess. Lignin can effectively fill loess pores and cement loess particles. Compared with compacted loess, no new mineral components are generated in the lignin-modified loess. The optimum lignin content of dynamics characteristic of modified loess is present, and the optimum lignin content is 1%.

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