@Article{jrm.2021.015693,
AUTHOR = {Shengquan Zhou, Minjie Shi, Wei Chen, Yongfei Zhang, Weijian Wang, Haojin Zhang, Dongwei Li},
TITLE = {Improved Geotechnical Behavior of an Expansive Soil Amended with Cationic Polyacrylamide},
JOURNAL = {Journal of Renewable Materials},
VOLUME = {9},
YEAR = {2021},
NUMBER = {11},
PAGES = {1941--1957},
URL = {http://www.techscience.com/jrm/v9n11/42807},
ISSN = {2164-6341},
ABSTRACT = {The characteristics of soil treated with cationic polyacrylamide (CPAM) mass content of 0%, 0.2%, 0.4%, 0.6%,
0.8%, and 1% were investigated through a series of laboratory tests to explore the practical engineering effect
of an expansive soil amended with environmental protection material CPAM. The results indicate that with
the increasing CPAM content, the liquid limit and plasticity index of soil decrease, the plastic limit increases,
and the free swelling ratio and loaded swelling ratio decrease. Besides, the improved soil has less disintegrating
property and better water stability. The shear strength increases as the content increases, and the optimal content
is 0.6%. Meanwhile, the cohesion of the soil first increases and then decreases, and the internal friction angle
increases. Additionally, the unconfined compressive strength first increases and then decreases. The improved soil
presents the characteristics of brittle failure and reaches the peak value (410.1 kPa) at the content of 0.8% after
curing for 14 days. Scanning electron microscope (SEM) exhibits that the number of curved and wrinkled sections
of the expansive soil is reduced after CPAM improvement. Simultaneously, the arrangement of the superimposed
polymer changes from face-face to side-angle or side-face-angle, and the reticular structure formed improves the
strength and spatial stability of the soil. Therefore, adding appropriate cationic polyacrylamide could improve
expansive soil in engineering.},
DOI = {10.32604/jrm.2021.015693}
}