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Evaluation of carbonation effect of cement solidified contaminated soil in Highway Subgrade

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Document pages: 15 pages

Abstract: Cement solidification stabilization technology is widely used in contaminated soil because of its low price and can significantly improve the structural properties of soil. In order to improve the utilization of solidified matrix, cement solidified contaminated soil is used as road subgrade material. Through experiments and numerical analysis, the carbonation effect reflecting the strength characteristics of cement solidified contaminated soil and the durability of pavement settlement are evaluated respectively. According to the results, the compressive strength of specimens containing 1 Pb (II) ranges from 0.44 MPa to 1.17 MPa and 0.14 MPa to 2.67 MPa under carbonization and standard curing conditions. The relatively low strength is attributed to the immobilization of heavy metals, which consumes Prt of SiO2, Al2O3, and CaO components in the cement or kaolin and reduced the hydration and pozzolanic reaction materials. This phenomenon further decreased the strength of solidified soils. The carbonation depth of 1 Cu(II) or Zn(II) contaminated soils was 18 mm, which significantly increased with the increase of curing time and contamination concentration. Furthermore, the finite element calculation results showed that surface settlements decreased with the increase of modulus of subgrade and the distance away from the center. At the center, the pavement settlement was proportional to the level of traffic load.

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