Restrained shrinkage cracking of cementitious composites containing soft PCM inclusions: A paste (matrix) controlled response

Zhenhua Wei, Gabriel Falzone, Sumanta Das, Naman Saklani, Yann Le Pape, Laurent Pilon, Narayanan Neithalath, Gaurav Sant

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The addition of phase change materials (PCMs) has been proposed as a means to mitigate thermal cracking in cementitious materials. However, the addition of PCMs, i.e., soft inclusions, degrades the compressive strength of cementitious composites. From a strength-of-materials viewpoint, such reductions in strength are suspected to increase the tendency of cementitious materials containing PCMs to crack under load (e.g., volume instability-induced stresses resulting from thermal and/or hygral deformations). Based on detailed assessments of free and restrained shrinkage, elastic modulus, and tensile strength, this study shows that the addition of PCMs does not alter the cracking sensitivity of the material. In fact, the addition of PCMs (or other soft inclusions) enhances the cracking resistance as compared to a plain cement paste or composites containing equivalent dosages of (stiff) quartz inclusions. This is because composites containing soft inclusions demonstrate benefits resulting from crack blunting and deflection, and improved stress relaxation. As a result, although the tensile stress at failure remains similar, the time to failure (i.e., macroscopic cracking) of PCM-containing composites is considerably extended. More generally, the outcomes indicate that dosages of soft(er) inclusions, and the resulting decrease in compressive strength does not amplify the cracking risk of cementitious composites.

Original languageEnglish (US)
Pages (from-to)367-374
Number of pages8
JournalMaterials and Design
Volume132
DOIs
StatePublished - Oct 15 2017

Fingerprint

Adhesive pastes
Phase change materials
Ointments
Composite materials
Compressive strength
Cracks
Quartz
Stress relaxation
Tensile stress
Strength of materials
Loads (forces)
Cements
Tensile strength
Elastic moduli

Keywords

  • Composites
  • Cracking
  • Elastic modulus
  • Inclusions
  • Strength

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Restrained shrinkage cracking of cementitious composites containing soft PCM inclusions : A paste (matrix) controlled response. / Wei, Zhenhua; Falzone, Gabriel; Das, Sumanta; Saklani, Naman; Le Pape, Yann; Pilon, Laurent; Neithalath, Narayanan; Sant, Gaurav.

In: Materials and Design, Vol. 132, 15.10.2017, p. 367-374.

Research output: Contribution to journalArticle

Wei, Zhenhua ; Falzone, Gabriel ; Das, Sumanta ; Saklani, Naman ; Le Pape, Yann ; Pilon, Laurent ; Neithalath, Narayanan ; Sant, Gaurav. / Restrained shrinkage cracking of cementitious composites containing soft PCM inclusions : A paste (matrix) controlled response. In: Materials and Design. 2017 ; Vol. 132. pp. 367-374.
@article{6c21ae93be6241f197e38a17cdc18373,
title = "Restrained shrinkage cracking of cementitious composites containing soft PCM inclusions: A paste (matrix) controlled response",
abstract = "The addition of phase change materials (PCMs) has been proposed as a means to mitigate thermal cracking in cementitious materials. However, the addition of PCMs, i.e., soft inclusions, degrades the compressive strength of cementitious composites. From a strength-of-materials viewpoint, such reductions in strength are suspected to increase the tendency of cementitious materials containing PCMs to crack under load (e.g., volume instability-induced stresses resulting from thermal and/or hygral deformations). Based on detailed assessments of free and restrained shrinkage, elastic modulus, and tensile strength, this study shows that the addition of PCMs does not alter the cracking sensitivity of the material. In fact, the addition of PCMs (or other soft inclusions) enhances the cracking resistance as compared to a plain cement paste or composites containing equivalent dosages of (stiff) quartz inclusions. This is because composites containing soft inclusions demonstrate benefits resulting from crack blunting and deflection, and improved stress relaxation. As a result, although the tensile stress at failure remains similar, the time to failure (i.e., macroscopic cracking) of PCM-containing composites is considerably extended. More generally, the outcomes indicate that dosages of soft(er) inclusions, and the resulting decrease in compressive strength does not amplify the cracking risk of cementitious composites.",
keywords = "Composites, Cracking, Elastic modulus, Inclusions, Strength",
author = "Zhenhua Wei and Gabriel Falzone and Sumanta Das and Naman Saklani and {Le Pape}, Yann and Laurent Pilon and Narayanan Neithalath and Gaurav Sant",
year = "2017",
month = "10",
day = "15",
doi = "10.1016/j.matdes.2017.06.066",
language = "English (US)",
volume = "132",
pages = "367--374",
journal = "Materials and Design",
issn = "0261-3069",
publisher = "Elsevier BV",

}

TY - JOUR

T1 - Restrained shrinkage cracking of cementitious composites containing soft PCM inclusions

T2 - A paste (matrix) controlled response

AU - Wei, Zhenhua

AU - Falzone, Gabriel

AU - Das, Sumanta

AU - Saklani, Naman

AU - Le Pape, Yann

AU - Pilon, Laurent

AU - Neithalath, Narayanan

AU - Sant, Gaurav

PY - 2017/10/15

Y1 - 2017/10/15

N2 - The addition of phase change materials (PCMs) has been proposed as a means to mitigate thermal cracking in cementitious materials. However, the addition of PCMs, i.e., soft inclusions, degrades the compressive strength of cementitious composites. From a strength-of-materials viewpoint, such reductions in strength are suspected to increase the tendency of cementitious materials containing PCMs to crack under load (e.g., volume instability-induced stresses resulting from thermal and/or hygral deformations). Based on detailed assessments of free and restrained shrinkage, elastic modulus, and tensile strength, this study shows that the addition of PCMs does not alter the cracking sensitivity of the material. In fact, the addition of PCMs (or other soft inclusions) enhances the cracking resistance as compared to a plain cement paste or composites containing equivalent dosages of (stiff) quartz inclusions. This is because composites containing soft inclusions demonstrate benefits resulting from crack blunting and deflection, and improved stress relaxation. As a result, although the tensile stress at failure remains similar, the time to failure (i.e., macroscopic cracking) of PCM-containing composites is considerably extended. More generally, the outcomes indicate that dosages of soft(er) inclusions, and the resulting decrease in compressive strength does not amplify the cracking risk of cementitious composites.

AB - The addition of phase change materials (PCMs) has been proposed as a means to mitigate thermal cracking in cementitious materials. However, the addition of PCMs, i.e., soft inclusions, degrades the compressive strength of cementitious composites. From a strength-of-materials viewpoint, such reductions in strength are suspected to increase the tendency of cementitious materials containing PCMs to crack under load (e.g., volume instability-induced stresses resulting from thermal and/or hygral deformations). Based on detailed assessments of free and restrained shrinkage, elastic modulus, and tensile strength, this study shows that the addition of PCMs does not alter the cracking sensitivity of the material. In fact, the addition of PCMs (or other soft inclusions) enhances the cracking resistance as compared to a plain cement paste or composites containing equivalent dosages of (stiff) quartz inclusions. This is because composites containing soft inclusions demonstrate benefits resulting from crack blunting and deflection, and improved stress relaxation. As a result, although the tensile stress at failure remains similar, the time to failure (i.e., macroscopic cracking) of PCM-containing composites is considerably extended. More generally, the outcomes indicate that dosages of soft(er) inclusions, and the resulting decrease in compressive strength does not amplify the cracking risk of cementitious composites.

KW - Composites

KW - Cracking

KW - Elastic modulus

KW - Inclusions

KW - Strength

UR - http://www.scopus.com/inward/record.url?scp=85023603448&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85023603448&partnerID=8YFLogxK

U2 - 10.1016/j.matdes.2017.06.066

DO - 10.1016/j.matdes.2017.06.066

M3 - Article

AN - SCOPUS:85023603448

VL - 132

SP - 367

EP - 374

JO - Materials and Design

JF - Materials and Design

SN - 0261-3069

ER -