A model to measure compressive strength of compressed earth blocks with the '3 points bending test'

J. C. Morel, A. Pkla

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

This article proposes a modelling of the '3 points bending test' on compressed earth blocks (CEB) which will give their compressive strength. This test is already used in situ for CEB quality control. Conventional bending modelling gives the tensile stress at failure using three of the principal assumptions of the Strength of Materials theory, which are in fact not respected here. This is why it is proposed in this paper to model the arch behaviour in compression, which is of primary importance for aspect ratios less than three. Considering a proposed lattice, a behaviour at failure is obtained, close to that of a CEB during a 3 points bending test. The compressive stress at failure is obtained by using this lattice. The validation of the model is given using experimental data. Then the model gives information on the CEB structure such as isotropy, dry density gradient within the CEB, and effect of friction with the experimental direct compression test device, leading to confinement of the sample.

Original languageEnglish
Pages (from-to)303-310
Number of pages8
JournalConstruction and Building Materials
Volume16
Issue number5
DOIs
Publication statusPublished - Jul 2002
Externally publishedYes

Fingerprint

Bending tests
Compressive strength
Earth (planet)
Arches
Compressive stress
Tensile stress
Strength of materials
Quality control
Aspect ratio
Friction

Keywords

  • Compressive strength
  • Earth blocks
  • In situ test
  • Model
  • Stabilised mud blocks

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Materials Science(all)

Cite this

A model to measure compressive strength of compressed earth blocks with the '3 points bending test'. / Morel, J. C.; Pkla, A.

In: Construction and Building Materials, Vol. 16, No. 5, 07.2002, p. 303-310.

Research output: Contribution to journalArticle

@article{1f9d32ede6bb4c949eb2db9f3387d30a,
title = "A model to measure compressive strength of compressed earth blocks with the '3 points bending test'",
abstract = "This article proposes a modelling of the '3 points bending test' on compressed earth blocks (CEB) which will give their compressive strength. This test is already used in situ for CEB quality control. Conventional bending modelling gives the tensile stress at failure using three of the principal assumptions of the Strength of Materials theory, which are in fact not respected here. This is why it is proposed in this paper to model the arch behaviour in compression, which is of primary importance for aspect ratios less than three. Considering a proposed lattice, a behaviour at failure is obtained, close to that of a CEB during a 3 points bending test. The compressive stress at failure is obtained by using this lattice. The validation of the model is given using experimental data. Then the model gives information on the CEB structure such as isotropy, dry density gradient within the CEB, and effect of friction with the experimental direct compression test device, leading to confinement of the sample.",
keywords = "Compressive strength, Earth blocks, In situ test, Model, Stabilised mud blocks",
author = "Morel, {J. C.} and A. Pkla",
year = "2002",
month = "7",
doi = "10.1016/S0950-0618(02)00023-5",
language = "English",
volume = "16",
pages = "303--310",
journal = "Construction and Building Materials",
issn = "0950-0618",
publisher = "Elsevier",
number = "5",

}

TY - JOUR

T1 - A model to measure compressive strength of compressed earth blocks with the '3 points bending test'

AU - Morel, J. C.

AU - Pkla, A.

PY - 2002/7

Y1 - 2002/7

N2 - This article proposes a modelling of the '3 points bending test' on compressed earth blocks (CEB) which will give their compressive strength. This test is already used in situ for CEB quality control. Conventional bending modelling gives the tensile stress at failure using three of the principal assumptions of the Strength of Materials theory, which are in fact not respected here. This is why it is proposed in this paper to model the arch behaviour in compression, which is of primary importance for aspect ratios less than three. Considering a proposed lattice, a behaviour at failure is obtained, close to that of a CEB during a 3 points bending test. The compressive stress at failure is obtained by using this lattice. The validation of the model is given using experimental data. Then the model gives information on the CEB structure such as isotropy, dry density gradient within the CEB, and effect of friction with the experimental direct compression test device, leading to confinement of the sample.

AB - This article proposes a modelling of the '3 points bending test' on compressed earth blocks (CEB) which will give their compressive strength. This test is already used in situ for CEB quality control. Conventional bending modelling gives the tensile stress at failure using three of the principal assumptions of the Strength of Materials theory, which are in fact not respected here. This is why it is proposed in this paper to model the arch behaviour in compression, which is of primary importance for aspect ratios less than three. Considering a proposed lattice, a behaviour at failure is obtained, close to that of a CEB during a 3 points bending test. The compressive stress at failure is obtained by using this lattice. The validation of the model is given using experimental data. Then the model gives information on the CEB structure such as isotropy, dry density gradient within the CEB, and effect of friction with the experimental direct compression test device, leading to confinement of the sample.

KW - Compressive strength

KW - Earth blocks

KW - In situ test

KW - Model

KW - Stabilised mud blocks

U2 - 10.1016/S0950-0618(02)00023-5

DO - 10.1016/S0950-0618(02)00023-5

M3 - Article

VL - 16

SP - 303

EP - 310

JO - Construction and Building Materials

JF - Construction and Building Materials

SN - 0950-0618

IS - 5

ER -