Unsaturated Soil Mechanics Principles to Remove and Replace Mitigation for Expansive Clays

Houston, Sandra L.; Bharadwaj, Anushree; Welfert, Bruno D.; Houston, William N.; Walsh, Kenneth D.

doi:10.1061/(asce)gt.1943-5606.0001429

Cited by 7 publications

(2 citation statements)

References 11 publications

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“…Pemadatan merupakan salah satu teknik perbaikan tanah yang paling efisien dan praktis digunakan pada pekerjaan tanah (Altun et al, 2008;Park, 2010). Kepadatan tanah di lapangan memerlukan evaluasi sebagai suatu jaminan kualitas pekerjaannya (Altun et al, 2008;Houston et al, 2016;Walsh et al, 1997).…”

Section: Pendahuluanunclassified

Evaluation of Soil Compaction in Building Construction Projects

Diana

Hartono

Muntohar

et al. 2022

MKTS

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Soil compaction is one of the robust methods to improve the strength and compressibility of earthwork since the method is more efficient and practical. However, the compaction work must be evaluated to meet the maximum dry density (MDD) required from the standard laboratory compaction test. The common method used for the evaluation of field density is the sand-cone test. The main objective of this study was to investigate the relative compaction of the borrow-fill at the building construction using the sand-cone test. The test procedure followed the ASTM D1556/D1556M-15e1 and ASTM D698-12e2 for sand-cone test and Proctor standard compaction test. Statistical analysis was performed to evaluate the density and moisture obtained from the field test at Dorm and Research and Innovation Center (RIC) project construction. The probability (p) of the compaction work exceeded the 0,9 MDD or Rc=90% was calculated p=13% and p=18%. The results corresponded to average relative compaction (Rc) of 80% and 82% at the Dorm and RIC project, respectively, with the deviation standard of 8.69 dan 8.81.

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Section: Pendahuluanunclassified

Evaluation of Soil Compaction in Building Construction Projects

Diana

Hartono

Muntohar

et al. 2022

MKTS

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“…Modifying and replacing expansive soil is often considered an economic solution to this problem [4]. Researchers believe that the replacement soil has to be of low hydraulic conductivity to prevent a bathtub effect and inhibit the moistening of the underlying expansive soil [5]. Thus, the modified materials and the hydraulic conductivity of expansive soil are essential for geotechnical engineering.…”

Section: Introductionmentioning

confidence: 99%

Effect of Superhydrophobic Nano-SiO2 on the Hydraulic Conductivity of Expansive Soil and Analysis of Its Mechanism

2023

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The present work determined the influence of superhydrophobic nano-SiO2 on the hydraulic conductivity and pore size distribution of expansive soil, and analysed the mechanism of modification between superhydrophobic nano-SiO2 and expansive soil from a microscopic view. Superhydrophobic nano-SiO2 was added to expansive soil as a modifier. Our samples were of two types, i.e., unmodified (without nano-SiO2) and modified (with 0.2%, 0.4%, 0.6%, 0.8%, and 1.0% nano-SiO2 by weight of the parent soil). The hydraulic conductivity decreased with increasing nano-SiO2 content. Fourier transform mid-infrared test revealed that some silanols in soil and nano-SiO2 were dehydrated and condensed to form siloxanes. We inferred that nano-SiO2 can attach onto the surface of soil particles to form a hydrophobic membrane, which reduced the soil expansion and the change in pore size distribution. And microscopic tests showed that the pore volume and hydrophilicity of the soil samples decreased with increasing SiO2 content. According to the Young–Laplace equation, the minimum permeable pore radius was calculated in the hydraulic-conductivity test. With increasing nano-SiO2 content, the volume of permeable pore decreased. It had an excellent linear relationship with the hydraulic conductivity and permeable pore volume of samples containing different nano-SiO2 contents. Therefore, superhydrophobic nano-SiO2 could effectively reduce hydraulic conductivity by changing the pore size distribution of expansive soil.

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