Shear Strength Characteristics of Cement Soil Modified with Polypropylene Fiber and Carbonation Curing Technology

doi:10.16552/j.cnki.issn1001-1625.2024.1239

Abstract

Abstract: In this study, the effect of polypropylene fiber (PPF) collaborative carbonation curing technology on the 7 d shear strength and failure mode of cement soil was discussed. The shear properties and carbon sequestration characteristics of cement soil with different PPF content and different curing conditions were tested by triaxial shear test, phenolphthalein method and thermogravimetric analysis. The results show that under the standard curing condition, the shear strength of cement soil increases with the increase of PPF content, and reaches the maximum value of 2 174 kPa when the fiber content is 0.9% (mass fraction). Under the carbonation curing condition, the shear strength of cement soil increases first and then decreases with the increase of fiber content, and reaches the maximum value of 4 477 kPa when the fiber content is 0.6%. Compared with standard curing, carbonation curing has a certain improvement effect on cohesive force, but the improvement effect on internal friction angle is more significant, and the internal friction angle is less affected by fiber content. The average carbonization depth of the sample cured for 7 d is 0.85 mm, and the carbon sequestration amount is 2.5% (mass fraction).

Key words: cement soil, polypropylene fiber, carbonation curing, shear strength, failure mode, carbon sequestration amount

CLC Number:

TU43

KONG Aisan, QIAN Sijia, WANG Wei, MA Xukun, LI Na. Shear Strength Characteristics of Cement Soil Modified with Polypropylene Fiber and Carbonation Curing Technology[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(5): 1939-1948.

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