New phosphate-based binder for stabilization of soils contaminated with heavy metals: Leaching, strength and microstructure characterization

Du, Yan-Jun; Wei, Ming; Reddy, Krishna R.; Jin, Fei; Hao, W.; Liu, Zhi Bin

doi:10.1016/j.jenvman.2014.07.035

Cited by 134 publications

(62 citation statements)

References 34 publications

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“…e pH value of kaolin is 4.70, which indicates its acid nature. e pH value of sand is 7.50, which is similar to the soil used in Du et al [51]. EC values of kaolin and sand are 0.42 mS/cm and 0.06 mS/cm, respectively.…”

Section: Characterization Of the Materialssupporting

confidence: 66%

Evaluation of Carbonation Effects on Cement‐Solidified Contaminated Soil Used in Road Subgrade

Zhou

Pan

Tang

et al. 2018

Advances in Materials Science and Engineering

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Cement solidification/stabilization is widely used towards contaminated soil since it has a low price and significant improvement for the structural capacity of soil. To increase the usage of the solidified matrix, cement-solidified contaminated soil was used as road subgrade material. In this study, carbonation effect that reflected the durability on strength characteristics of cementsolidified contaminated soil and the settlement of pavement were evaluated through experimental and numerical analysis, respectively. According to results, compressive strengths of specimens with 1% Pb(II) under carbonation and standard curing range from 0.44 MPa to 1.17 MPa and 0.14 MPa to 2.67 MPa, respectively. e relatively low strengths were attributed to immobilization of heavy metal, which consumed part of SiO 2 , Al 2 O 3 , and CaO components in the cement or kaolin and reduced the hydration and pozzolanic reaction materials. is phenomenon further decreased the strength of solidified soils. e 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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Section: Characterization Of the Materialssupporting

confidence: 66%

Evaluation of Carbonation Effects on Cement‐Solidified Contaminated Soil Used in Road Subgrade

Zhou

Pan

Tang

et al. 2018

Advances in Materials Science and Engineering

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“…(4). The presence of Pb hydroxide was not reported perhaps due to the relatively low rate of MgO hydration, but was suggested to precipitate by chemical modelling and has been reported in other research as the result of hydration of MgO [43]. The subsequent addition of MgO to P treated soil was supported by increased pyromorphite precipitation in the treated soils particularly PE, which was acidified by the P treatment.…”

Section: Magnesium Oxide As a Chemical Stabilisermentioning

confidence: 67%

“…Study of MgO and P has largely been focused on magnesium phosphate cements (MPC) and solidification/stabilisation mechanisms [42,43]. Where MgO has been assessed, only its effect on leachability and basic SEM confirmation of precipitation of PbO on the MgO surface has been presented [34] and [35].…”

Section: Introductionmentioning

confidence: 99%

Chemical stabilisation of lead in shooting range soils with phosphate and magnesium oxide: Synchrotron investigation

Sanderson

Naidu

Bolan

et al. 2015

Journal of Hazardous Materials

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“…Three different extraction liquids were used in this study, namely, standard extraction leachant (STD, 5.7 mL of acetic acid in 500 mL of distilled water with 64.3 mL of 1 M sodium hydroxide (NaOH) solution, diluted to a volume of 1 L, pH 4.9370.05), which is consistent with the toxic characteristics leaching procedures (TCLP) according to EPA SW-846 Method 1311 (US EPA, 1992), artificial acid rain (AAR, pH 5.05, whose chemistry is the same with that reported by Du et al (2012)), and distilled deionized water (DIW, pH 7.0). The standard extraction leachant was used to assess the leachability of metals from the stabilized soils (Du et al, 2014c;Cetin et al, 2014). Artificial acid rain was selected as the extraction fluid since acid rain is a serious environmental pollution issue in the field test site and, furthermore, its impact on the leachability of stabilized soil are of concern (Du et al, , 2014b.…”

Section: Testing Programsmentioning

confidence: 99%

Field evaluation of soft highway subgrade soil stabilized with calcium carbide residue

Jiang

Liu

et al. 2016

Soils and Foundations

Self Cite

115

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Calcium carbide residue (CCR) is a by-product of acetylene gas production. Stockpiles of CCR continue to accumulate worldwide, in both developed and developing countries. Sustainable reuse options for CCR in civil infrastructures, such as road embankments, have been recently evaluated in the laboratory. However, to date there are limited studies on the actual field performance of CCR in stabilizing clayey soils in highway subgrades. In this study, a field trial was conducted to ascertain the viability of using CCR stabilized clayey soil as a highway subgrade course material. Quicklime was selected as a control binder in the field trial for comparison purposes. The construction procedures of the CCR and quicklime stabilizations in two field sections are presented. A series of field tests, including California Bearing Ratio (CBR) test, plate loading test, Benkelman beam deflection test, and dynamic cone penetrometer (DCP) test were undertaken after the embankment construction. The results indicated that in the top zone of the filled soil layers with 94% degree of compaction, the CCR stabilized subgrade soil exhibited higher values of CBR and resilient modulus, and lower values of resilient deflection and DCP Index relative to the quicklime stabilized soil. The field trial results indicated that CCR had negligible environmental effects and furthermore resulted in low construction costs. Based on the field test results, CCR was found to be a viable alternative binder for stabilizing soft subgrade soils. The outcomes of this research are significant from engineering, economic and environmental perspectives.

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New phosphate-based binder for stabilization of soils contaminated with heavy metals: Leaching, strength and microstructure characterization

Cited by 134 publications

References 34 publications

Evaluation of Carbonation Effects on Cement‐Solidified Contaminated Soil Used in Road Subgrade

Evaluation of Carbonation Effects on Cement‐Solidified Contaminated Soil Used in Road Subgrade

Chemical stabilisation of lead in shooting range soils with phosphate and magnesium oxide: Synchrotron investigation

Field evaluation of soft highway subgrade soil stabilized with calcium carbide residue

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