Potential of sodium sulfate solution for promoting the crack-healing performance for strain-hardening cementitious composites

Chung Chan Hung, Hsuan Hui Hung

研究成果: Article

摘要

Strain hardening cementitious composites (SHCCs) have been shown to have promising self-healing ability. Nevertheless, reliable healing performance only occurs for micro-cracks in relatively young SHCCs and requires several months of moisture exposure. To overcome these criteria for effective healing, this study explored the feasibility of using sodium sulfate solution to promote the healing performance of medium-term SHCCs. For this purpose, cracks were induced in SHCC specimens at the age of 180 days followed by a 28-day exposure to high sulfate ion concentrations. Four SHCC mixtures with different ratios of cement replaced by pozzolans were tested. In particular, the performance of the SHCCs containing an extremely high volume of granulated blast-furnace slag (GGBS) was studied. The healing behavior of the SHCCs was evaluated via multiple means, including uniaxial tensile tests, monitoring of the crack width, scanning electron microscopy, and energy dispersive x-rays. The results indicated that short-term exposure to sodium sulfate solution effectively promoted the healing performance of cracked SHCCs, especially for cracks with relatively larger widths. It was found that the newly formed healing precipitation within the cracks primarily consisted of calcium carbonate, calcium silicate hydrates, and ettringite. In addition, the SHCCs with 71% replacement of cement by GGBS had the highest recovery in terms of crack width and tensile response.

原文English
文章編號103461
期刊Cement and Concrete Composites
106
DOIs
出版狀態Published - 2020 二月

指紋

Sodium sulfate
Strain hardening
Cracks
Composite materials
Cements
Pozzolan
Silicic Acid
sodium sulfate
Calcium silicate
Calcium Carbonate
Calcium carbonate
Hydrates
Slags
Sulfates
Moisture
Ions
Recovery
X rays
Scanning electron microscopy
Monitoring

All Science Journal Classification (ASJC) codes

  • Building and Construction
  • Materials Science(all)

引用此文

@article{ed9f6c76c71a4635929780bed43411db,
title = "Potential of sodium sulfate solution for promoting the crack-healing performance for strain-hardening cementitious composites",
abstract = "Strain hardening cementitious composites (SHCCs) have been shown to have promising self-healing ability. Nevertheless, reliable healing performance only occurs for micro-cracks in relatively young SHCCs and requires several months of moisture exposure. To overcome these criteria for effective healing, this study explored the feasibility of using sodium sulfate solution to promote the healing performance of medium-term SHCCs. For this purpose, cracks were induced in SHCC specimens at the age of 180 days followed by a 28-day exposure to high sulfate ion concentrations. Four SHCC mixtures with different ratios of cement replaced by pozzolans were tested. In particular, the performance of the SHCCs containing an extremely high volume of granulated blast-furnace slag (GGBS) was studied. The healing behavior of the SHCCs was evaluated via multiple means, including uniaxial tensile tests, monitoring of the crack width, scanning electron microscopy, and energy dispersive x-rays. The results indicated that short-term exposure to sodium sulfate solution effectively promoted the healing performance of cracked SHCCs, especially for cracks with relatively larger widths. It was found that the newly formed healing precipitation within the cracks primarily consisted of calcium carbonate, calcium silicate hydrates, and ettringite. In addition, the SHCCs with 71{\%} replacement of cement by GGBS had the highest recovery in terms of crack width and tensile response.",
author = "Hung, {Chung Chan} and Hung, {Hsuan Hui}",
year = "2020",
month = "2",
doi = "10.1016/j.cemconcomp.2019.103461",
language = "English",
volume = "106",
journal = "Cement and Concrete Composites",
issn = "0958-9465",
publisher = "Elsevier Limited",

}

TY - JOUR

T1 - Potential of sodium sulfate solution for promoting the crack-healing performance for strain-hardening cementitious composites

AU - Hung, Chung Chan

AU - Hung, Hsuan Hui

PY - 2020/2

Y1 - 2020/2

N2 - Strain hardening cementitious composites (SHCCs) have been shown to have promising self-healing ability. Nevertheless, reliable healing performance only occurs for micro-cracks in relatively young SHCCs and requires several months of moisture exposure. To overcome these criteria for effective healing, this study explored the feasibility of using sodium sulfate solution to promote the healing performance of medium-term SHCCs. For this purpose, cracks were induced in SHCC specimens at the age of 180 days followed by a 28-day exposure to high sulfate ion concentrations. Four SHCC mixtures with different ratios of cement replaced by pozzolans were tested. In particular, the performance of the SHCCs containing an extremely high volume of granulated blast-furnace slag (GGBS) was studied. The healing behavior of the SHCCs was evaluated via multiple means, including uniaxial tensile tests, monitoring of the crack width, scanning electron microscopy, and energy dispersive x-rays. The results indicated that short-term exposure to sodium sulfate solution effectively promoted the healing performance of cracked SHCCs, especially for cracks with relatively larger widths. It was found that the newly formed healing precipitation within the cracks primarily consisted of calcium carbonate, calcium silicate hydrates, and ettringite. In addition, the SHCCs with 71% replacement of cement by GGBS had the highest recovery in terms of crack width and tensile response.

AB - Strain hardening cementitious composites (SHCCs) have been shown to have promising self-healing ability. Nevertheless, reliable healing performance only occurs for micro-cracks in relatively young SHCCs and requires several months of moisture exposure. To overcome these criteria for effective healing, this study explored the feasibility of using sodium sulfate solution to promote the healing performance of medium-term SHCCs. For this purpose, cracks were induced in SHCC specimens at the age of 180 days followed by a 28-day exposure to high sulfate ion concentrations. Four SHCC mixtures with different ratios of cement replaced by pozzolans were tested. In particular, the performance of the SHCCs containing an extremely high volume of granulated blast-furnace slag (GGBS) was studied. The healing behavior of the SHCCs was evaluated via multiple means, including uniaxial tensile tests, monitoring of the crack width, scanning electron microscopy, and energy dispersive x-rays. The results indicated that short-term exposure to sodium sulfate solution effectively promoted the healing performance of cracked SHCCs, especially for cracks with relatively larger widths. It was found that the newly formed healing precipitation within the cracks primarily consisted of calcium carbonate, calcium silicate hydrates, and ettringite. In addition, the SHCCs with 71% replacement of cement by GGBS had the highest recovery in terms of crack width and tensile response.

UR - http://www.scopus.com/inward/record.url?scp=85075402226&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85075402226&partnerID=8YFLogxK

U2 - 10.1016/j.cemconcomp.2019.103461

DO - 10.1016/j.cemconcomp.2019.103461

M3 - Article

AN - SCOPUS:85075402226

VL - 106

JO - Cement and Concrete Composites

JF - Cement and Concrete Composites

SN - 0958-9465

M1 - 103461

ER -