Adhesive properties of laminated veneer lumber poles for use in temporary soil nailing: development and evaluation of a test method for curved structures in a high-alkaline environment

Sebastian Hirschmüller, Johann Pravida, Roman Marte, Michael Flach

Research output: Contribution to journalArticle

Abstract

Innovative circular, hollow, laminated veneer lumber (LVL) beech sections for use as temporary geotechnical soil reinforcement members are currently being developed. Appropriate surface gluing quality between the veneers is fundamental to this subsoil application of the permanently cement-embedded, engineered timber product. The circular cross-section geometry and the permanently high-alkaline environment of the structural member is not covered by presently standardized testing and conditioning methods for examining LVL surface bond line quality. The sample conditioning and tensile shear test method compliant with EN 302-1 (Adhesives for load-bearing timberstructures—test methods—part 1: determination of longitudinal tensile shear strength, European Committee for Standardization, Brussels, 2013) was modified to determine bonding parameters for circular, hollow LVL sections. Bond line curvature, groove cutting depth and sample geometry were found to greatly influence stress distribution, percentage of wood failure and tensile shear strength. Short-term alkaline treatment of test samples did not significantly influence the bonding performance, wood failure percentage, tensile shear strength and fracture patterns. To improve tensile shear strength, adhesives with different material rigidities were used and compared. An orthotropic, elastic numerical analysis revealed a greater influence of adherent elasticity than adhesive elasticity on the stress distribution within the bond line. With regard to determining the bond line integrity of curved veneer poles, a sample geometry compliant with EN 302-1 (2013) was developed and numerically evaluated.

LanguageEnglish
Pages1061-1092
Number of pages32
JournalWood Science and Technology
Volume52
Issue number4
DOIs
StatusPublished - 1 Jul 2018

Fingerprint

laminated veneer lumber
soil nailing
alkaline environment
Veneers
Lumber
shear strength
adhesives
Poles
Adhesives
Shear strength
Soils
elasticity (mechanics)
geometry
conditioning
elasticity
soil
testing
surface quality
Geometry
Stress concentration

ASJC Scopus subject areas

  • Forestry
  • Materials Science(all)
  • Plant Science
  • Industrial and Manufacturing Engineering

Cite this

Adhesive properties of laminated veneer lumber poles for use in temporary soil nailing : development and evaluation of a test method for curved structures in a high-alkaline environment. / Hirschmüller, Sebastian; Pravida, Johann; Marte, Roman; Flach, Michael.

In: Wood Science and Technology, Vol. 52, No. 4, 01.07.2018, p. 1061-1092.

Research output: Contribution to journalArticle

@article{92a3e1b2cb3746c496cdafb50f28772c,
title = "Adhesive properties of laminated veneer lumber poles for use in temporary soil nailing: development and evaluation of a test method for curved structures in a high-alkaline environment",
abstract = "Innovative circular, hollow, laminated veneer lumber (LVL) beech sections for use as temporary geotechnical soil reinforcement members are currently being developed. Appropriate surface gluing quality between the veneers is fundamental to this subsoil application of the permanently cement-embedded, engineered timber product. The circular cross-section geometry and the permanently high-alkaline environment of the structural member is not covered by presently standardized testing and conditioning methods for examining LVL surface bond line quality. The sample conditioning and tensile shear test method compliant with EN 302-1 (Adhesives for load-bearing timberstructures—test methods—part 1: determination of longitudinal tensile shear strength, European Committee for Standardization, Brussels, 2013) was modified to determine bonding parameters for circular, hollow LVL sections. Bond line curvature, groove cutting depth and sample geometry were found to greatly influence stress distribution, percentage of wood failure and tensile shear strength. Short-term alkaline treatment of test samples did not significantly influence the bonding performance, wood failure percentage, tensile shear strength and fracture patterns. To improve tensile shear strength, adhesives with different material rigidities were used and compared. An orthotropic, elastic numerical analysis revealed a greater influence of adherent elasticity than adhesive elasticity on the stress distribution within the bond line. With regard to determining the bond line integrity of curved veneer poles, a sample geometry compliant with EN 302-1 (2013) was developed and numerically evaluated.",
author = "Sebastian Hirschm{\"u}ller and Johann Pravida and Roman Marte and Michael Flach",
year = "2018",
month = "7",
day = "1",
doi = "10.1007/s00226-018-0997-y",
language = "English",
volume = "52",
pages = "1061--1092",
journal = "Wood science and technology",
issn = "0043-7719",
publisher = "Springer Verlag",
number = "4",

}

TY - JOUR

T1 - Adhesive properties of laminated veneer lumber poles for use in temporary soil nailing

T2 - Wood science and technology

AU - Hirschmüller,Sebastian

AU - Pravida,Johann

AU - Marte,Roman

AU - Flach,Michael

PY - 2018/7/1

Y1 - 2018/7/1

N2 - Innovative circular, hollow, laminated veneer lumber (LVL) beech sections for use as temporary geotechnical soil reinforcement members are currently being developed. Appropriate surface gluing quality between the veneers is fundamental to this subsoil application of the permanently cement-embedded, engineered timber product. The circular cross-section geometry and the permanently high-alkaline environment of the structural member is not covered by presently standardized testing and conditioning methods for examining LVL surface bond line quality. The sample conditioning and tensile shear test method compliant with EN 302-1 (Adhesives for load-bearing timberstructures—test methods—part 1: determination of longitudinal tensile shear strength, European Committee for Standardization, Brussels, 2013) was modified to determine bonding parameters for circular, hollow LVL sections. Bond line curvature, groove cutting depth and sample geometry were found to greatly influence stress distribution, percentage of wood failure and tensile shear strength. Short-term alkaline treatment of test samples did not significantly influence the bonding performance, wood failure percentage, tensile shear strength and fracture patterns. To improve tensile shear strength, adhesives with different material rigidities were used and compared. An orthotropic, elastic numerical analysis revealed a greater influence of adherent elasticity than adhesive elasticity on the stress distribution within the bond line. With regard to determining the bond line integrity of curved veneer poles, a sample geometry compliant with EN 302-1 (2013) was developed and numerically evaluated.

AB - Innovative circular, hollow, laminated veneer lumber (LVL) beech sections for use as temporary geotechnical soil reinforcement members are currently being developed. Appropriate surface gluing quality between the veneers is fundamental to this subsoil application of the permanently cement-embedded, engineered timber product. The circular cross-section geometry and the permanently high-alkaline environment of the structural member is not covered by presently standardized testing and conditioning methods for examining LVL surface bond line quality. The sample conditioning and tensile shear test method compliant with EN 302-1 (Adhesives for load-bearing timberstructures—test methods—part 1: determination of longitudinal tensile shear strength, European Committee for Standardization, Brussels, 2013) was modified to determine bonding parameters for circular, hollow LVL sections. Bond line curvature, groove cutting depth and sample geometry were found to greatly influence stress distribution, percentage of wood failure and tensile shear strength. Short-term alkaline treatment of test samples did not significantly influence the bonding performance, wood failure percentage, tensile shear strength and fracture patterns. To improve tensile shear strength, adhesives with different material rigidities were used and compared. An orthotropic, elastic numerical analysis revealed a greater influence of adherent elasticity than adhesive elasticity on the stress distribution within the bond line. With regard to determining the bond line integrity of curved veneer poles, a sample geometry compliant with EN 302-1 (2013) was developed and numerically evaluated.

UR - http://www.scopus.com/inward/record.url?scp=85048811393&partnerID=8YFLogxK

U2 - 10.1007/s00226-018-0997-y

DO - 10.1007/s00226-018-0997-y

M3 - Article

VL - 52

SP - 1061

EP - 1092

JO - Wood science and technology

JF - Wood science and technology

SN - 0043-7719

IS - 4

ER -