Effects of freeze-thaw cycles on mechanical properties of polypropylene Fiber and cement stabilized clay

By M. Ding, Feng Zhang, X. Ling, Bo Lin. Cold Regions Science and Technology, 2018

137 citations recorded by the source corpus.

Abstract To investigate the effects of fiber, cement and freeze-thaw cycles on the cement-treated clay and fiber and cement stabilized clay, a series of freeze-thaw tests with no water supply condition were conducted on the stabilized soil after standard curing for 7 days subsequently, and then the unconfined compression tests were carried out. The dimension change ratio, stress-strain relationship curves, post-peak stress ratio, tangent modulus and unconfined compressive strength (UCS) were obtained and analyzed in terms of the number of freeze-thaw cycles, cement, and fiber contents. Results show that cement-treated soil exhibits volumetric shrinkage behavior, and the dimension shrinkage ratio increases with increasing cement content and freeze-thaw cycles. A majority of fiber and cement stabilized soil specimens present volumetric expansive behavior, and the dimension expansive ratio increases with increasing fiber content and freeze-thaw cycles. Stress-strain curves for soils subjected to freeze-thaw cycles exhibit an initial flexible stage, and a greater post-peak stress was observed on fiber-stabilized soils than cement-treated soils due to the ductile behavior of fiber. Tangent modulus increases with increasing cement content and decreases with increasing fiber content, and drops sharply by 43%~72% after one freeze-thaw cycle. Unconfined compressive strength increases obviously with increasing cement content, decreases sharply after the first few freeze-thaw cycles, then exhibits little change after five freeze-thaw cycles. The UCS reduction ratio ranges from 42% to 69% after ten freeze-thaw cycles. The addition of polypropylene fiber shows an improvement in UCS and exhibits higher UCS at fiber content of 0.20%. Finally, an empirical model for predicting UCS was proposed by considering the effects of cement content, fiber content and numbers of freeze-thaw cycles, and the predicted UCS show a good agreement with test results.

Subfields: Civil and Structural Engineering, Industrial and Manufacturing Engineering

View Paper: https://www.semanticscholar.org/paper/e80a07bdd1d9d07ebe5e0abf75b188391818e723

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Citations in the corpus

• Effect of the addition of polypropylene fiber on concrete properties (2021, background): “Besides, the reports show that the addition of polypropylene fiber in appropriate proportions to concrete mixtures leads to an increase in the mechanical properties such as impact resistance [15,16] and abrasion resistance [17,18] and a decrease in the volume expansions resulting from freeze-thaw [1”