Friction behavior of controlled low strength material–soil interface

Woojin Han, Sang Yeob Kim, Jong Sub Lee, Yong Hoon Byun

Research output: Contribution to journalArticle

Abstract

A controlled low strength material (CLSM) is a highly flowable cementitious material used for trench backfilling. However, when applying vertical loads to backfilled trenches, shear failure or differential settlement may occur at the interface between the CLSM and natural soil. Hence, this study aims to evaluate the characteristics of the interface friction between the CLSM and soils based on curing time, gradation, and normal stress. The CLSM is composed of fly ash, calcium sulfoaluminate cement, sand, silt, water, and an accelerator. To investigate the engineering properties of the CLSM, flow and unconfined compressive strength tests are carried out. Poorly graded and well-graded sands are selected as the in-situ soil adjacent to the CLSM. The direct shear tests of the CLSM and soils are carried out under three normal stresses for four different curing times. The test results show that the shear strengths obtained within 1 day are higher than those obtained after 1 day. As the curing time increases, the maximum dilation of the poorly graded sand–CLSM specimens under lower normal stresses also generally increases. The maximum contraction increases with increasing normal stress, but it decreases with increasing curing time. The shear strengths of the well-graded sand–CLSM interface are greater than those of the poorly graded sand–CLSM interface. Moreover, the friction angle for the CLSM–soil interface decreases with increasing curing time, and the friction angles of the well-graded sand–CLSM interface are greater than those of the poorly graded sand–CLSM interface. The results suggest that the CLSM may be effectively used for trench backfilling owing to a better understanding of the interface shear strength and behavior between the CLSM and soils.

Original languageEnglish
Pages (from-to)407-415
Number of pages9
JournalGeomechanics and Engineering
Volume18
Issue number4
DOIs
Publication statusPublished - 2019 Jul 20

Fingerprint

friction
Friction
Curing
Soils
shear strength
trench
Shear strength
soil
Sand
material
sand
dilation
geotechnical property
shear test
Silt
compressive strength
fly ash
contraction
Fly ash
silt

Keywords

  • Backfill
  • CLSM
  • Curing time
  • Direct shear test
  • Interface friction

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Geotechnical Engineering and Engineering Geology

Cite this

Friction behavior of controlled low strength material–soil interface. / Han, Woojin; Kim, Sang Yeob; Lee, Jong Sub; Byun, Yong Hoon.

In: Geomechanics and Engineering, Vol. 18, No. 4, 20.07.2019, p. 407-415.

Research output: Contribution to journalArticle

Han, Woojin ; Kim, Sang Yeob ; Lee, Jong Sub ; Byun, Yong Hoon. / Friction behavior of controlled low strength material–soil interface. In: Geomechanics and Engineering. 2019 ; Vol. 18, No. 4. pp. 407-415.
@article{e6c34004f924477993f793ffacaef65a,
title = "Friction behavior of controlled low strength material–soil interface",
abstract = "A controlled low strength material (CLSM) is a highly flowable cementitious material used for trench backfilling. However, when applying vertical loads to backfilled trenches, shear failure or differential settlement may occur at the interface between the CLSM and natural soil. Hence, this study aims to evaluate the characteristics of the interface friction between the CLSM and soils based on curing time, gradation, and normal stress. The CLSM is composed of fly ash, calcium sulfoaluminate cement, sand, silt, water, and an accelerator. To investigate the engineering properties of the CLSM, flow and unconfined compressive strength tests are carried out. Poorly graded and well-graded sands are selected as the in-situ soil adjacent to the CLSM. The direct shear tests of the CLSM and soils are carried out under three normal stresses for four different curing times. The test results show that the shear strengths obtained within 1 day are higher than those obtained after 1 day. As the curing time increases, the maximum dilation of the poorly graded sand–CLSM specimens under lower normal stresses also generally increases. The maximum contraction increases with increasing normal stress, but it decreases with increasing curing time. The shear strengths of the well-graded sand–CLSM interface are greater than those of the poorly graded sand–CLSM interface. Moreover, the friction angle for the CLSM–soil interface decreases with increasing curing time, and the friction angles of the well-graded sand–CLSM interface are greater than those of the poorly graded sand–CLSM interface. The results suggest that the CLSM may be effectively used for trench backfilling owing to a better understanding of the interface shear strength and behavior between the CLSM and soils.",
keywords = "Backfill, CLSM, Curing time, Direct shear test, Interface friction",
author = "Woojin Han and Kim, {Sang Yeob} and Lee, {Jong Sub} and Byun, {Yong Hoon}",
year = "2019",
month = "7",
day = "20",
doi = "10.12989/gae.2019.18.4.407",
language = "English",
volume = "18",
pages = "407--415",
journal = "Geomechanics and Engineering",
issn = "2005-307X",
publisher = "Techno Press",
number = "4",

}

TY - JOUR

T1 - Friction behavior of controlled low strength material–soil interface

AU - Han, Woojin

AU - Kim, Sang Yeob

AU - Lee, Jong Sub

AU - Byun, Yong Hoon

PY - 2019/7/20

Y1 - 2019/7/20

N2 - A controlled low strength material (CLSM) is a highly flowable cementitious material used for trench backfilling. However, when applying vertical loads to backfilled trenches, shear failure or differential settlement may occur at the interface between the CLSM and natural soil. Hence, this study aims to evaluate the characteristics of the interface friction between the CLSM and soils based on curing time, gradation, and normal stress. The CLSM is composed of fly ash, calcium sulfoaluminate cement, sand, silt, water, and an accelerator. To investigate the engineering properties of the CLSM, flow and unconfined compressive strength tests are carried out. Poorly graded and well-graded sands are selected as the in-situ soil adjacent to the CLSM. The direct shear tests of the CLSM and soils are carried out under three normal stresses for four different curing times. The test results show that the shear strengths obtained within 1 day are higher than those obtained after 1 day. As the curing time increases, the maximum dilation of the poorly graded sand–CLSM specimens under lower normal stresses also generally increases. The maximum contraction increases with increasing normal stress, but it decreases with increasing curing time. The shear strengths of the well-graded sand–CLSM interface are greater than those of the poorly graded sand–CLSM interface. Moreover, the friction angle for the CLSM–soil interface decreases with increasing curing time, and the friction angles of the well-graded sand–CLSM interface are greater than those of the poorly graded sand–CLSM interface. The results suggest that the CLSM may be effectively used for trench backfilling owing to a better understanding of the interface shear strength and behavior between the CLSM and soils.

AB - A controlled low strength material (CLSM) is a highly flowable cementitious material used for trench backfilling. However, when applying vertical loads to backfilled trenches, shear failure or differential settlement may occur at the interface between the CLSM and natural soil. Hence, this study aims to evaluate the characteristics of the interface friction between the CLSM and soils based on curing time, gradation, and normal stress. The CLSM is composed of fly ash, calcium sulfoaluminate cement, sand, silt, water, and an accelerator. To investigate the engineering properties of the CLSM, flow and unconfined compressive strength tests are carried out. Poorly graded and well-graded sands are selected as the in-situ soil adjacent to the CLSM. The direct shear tests of the CLSM and soils are carried out under three normal stresses for four different curing times. The test results show that the shear strengths obtained within 1 day are higher than those obtained after 1 day. As the curing time increases, the maximum dilation of the poorly graded sand–CLSM specimens under lower normal stresses also generally increases. The maximum contraction increases with increasing normal stress, but it decreases with increasing curing time. The shear strengths of the well-graded sand–CLSM interface are greater than those of the poorly graded sand–CLSM interface. Moreover, the friction angle for the CLSM–soil interface decreases with increasing curing time, and the friction angles of the well-graded sand–CLSM interface are greater than those of the poorly graded sand–CLSM interface. The results suggest that the CLSM may be effectively used for trench backfilling owing to a better understanding of the interface shear strength and behavior between the CLSM and soils.

KW - Backfill

KW - CLSM

KW - Curing time

KW - Direct shear test

KW - Interface friction

UR - http://www.scopus.com/inward/record.url?scp=85071672327&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85071672327&partnerID=8YFLogxK

U2 - 10.12989/gae.2019.18.4.407

DO - 10.12989/gae.2019.18.4.407

M3 - Article

AN - SCOPUS:85071672327

VL - 18

SP - 407

EP - 415

JO - Geomechanics and Engineering

JF - Geomechanics and Engineering

SN - 2005-307X

IS - 4

ER -