Durability and Self-Sealing Examination of Concretes Modified with Crystalline Waterproofing Admixtures

Repairing concrete structures costs billions of dollars every year all around the globe. For overcoming durability concerns and creating enduring economical structures, chemical admixtures, as a unique solution, have recently attracted a lot of interest. As permeability of a concrete structure is co...

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Autores principales:	Pejman Azarsa, Rishi Gupta, Peiman Azarsa, Alireza Biparva
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	crystalline waterproofing admixtures (CWA) durability of cement-based materials permeability reducing admixtures (PRA) freeze–thaw resistance steel reinforcement corrosion self-sealing Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
Acceso en línea:	https://doaj.org/article/86efcf262b8c4bb9bb008b6449ba11a2
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spelling	oai:doaj.org-article:86efcf262b8c4bb9bb008b6449ba11a22021-11-11T18:04:43ZDurability and Self-Sealing Examination of Concretes Modified with Crystalline Waterproofing Admixtures10.3390/ma142165081996-1944https://doaj.org/article/86efcf262b8c4bb9bb008b6449ba11a22021-10-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/21/6508https://doaj.org/toc/1996-1944Repairing concrete structures costs billions of dollars every year all around the globe. For overcoming durability concerns and creating enduring economical structures, chemical admixtures, as a unique solution, have recently attracted a lot of interest. As permeability of a concrete structure is considered to play a significant role in its durability, Permeability Reducing Admixtures (PRA) is one of the ideal solutions for protecting structures exposed to water and waterborne chemicals. Different products have been developed to protect concrete structures against water penetration, which, based on their chemistry, performance, and functionality, have been categorized into PRA. As it has previously been tested by authors and proven to be a promising solution, a hydrophilic Crystalline Waterproofing Admixtures (CWA) has been considered for this study. This paper aims to investigate how this product affects concrete’s overall freeze–thaw resistance, self-sealing, and corrosion resistance. Various testing methods have been utilized to examine the performance of CWA mixtures, including the linear polarization resistance, resonance frequency testing, half-cell potential, and self-sealing test. The reinforcement corrosion potential and rate measurements indicated superior performance for CWA-treated samples. After being exposed to 300 freeze–thaw cycles, concrete mixes containing CWA—even non-air-entrained ones—showed a Durability Factor (DF) of more than 80% with no signs of failure, while non-air-entrained control samples indicated the lowest DF (below 60%) but the greatest mass loss. The major causes are a reduction in solution permeability and lack of water availability in the concrete matrix—due to the presence of CWA crystals. Furthermore, evidence from the self-sealing test suggests that CWA-treated specimens can seal wider cracks and at a faster rate.Pejman AzarsaRishi GuptaPeiman AzarsaAlireza BiparvaMDPI AGarticlecrystalline waterproofing admixtures (CWA)durability of cement-based materialspermeability reducing admixtures (PRA)freeze–thaw resistancesteel reinforcement corrosionself-sealingTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 6508, p 6508 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	crystalline waterproofing admixtures (CWA) durability of cement-based materials permeability reducing admixtures (PRA) freeze–thaw resistance steel reinforcement corrosion self-sealing Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
spellingShingle	crystalline waterproofing admixtures (CWA) durability of cement-based materials permeability reducing admixtures (PRA) freeze–thaw resistance steel reinforcement corrosion self-sealing Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Pejman Azarsa Rishi Gupta Peiman Azarsa Alireza Biparva Durability and Self-Sealing Examination of Concretes Modified with Crystalline Waterproofing Admixtures
description	Repairing concrete structures costs billions of dollars every year all around the globe. For overcoming durability concerns and creating enduring economical structures, chemical admixtures, as a unique solution, have recently attracted a lot of interest. As permeability of a concrete structure is considered to play a significant role in its durability, Permeability Reducing Admixtures (PRA) is one of the ideal solutions for protecting structures exposed to water and waterborne chemicals. Different products have been developed to protect concrete structures against water penetration, which, based on their chemistry, performance, and functionality, have been categorized into PRA. As it has previously been tested by authors and proven to be a promising solution, a hydrophilic Crystalline Waterproofing Admixtures (CWA) has been considered for this study. This paper aims to investigate how this product affects concrete’s overall freeze–thaw resistance, self-sealing, and corrosion resistance. Various testing methods have been utilized to examine the performance of CWA mixtures, including the linear polarization resistance, resonance frequency testing, half-cell potential, and self-sealing test. The reinforcement corrosion potential and rate measurements indicated superior performance for CWA-treated samples. After being exposed to 300 freeze–thaw cycles, concrete mixes containing CWA—even non-air-entrained ones—showed a Durability Factor (DF) of more than 80% with no signs of failure, while non-air-entrained control samples indicated the lowest DF (below 60%) but the greatest mass loss. The major causes are a reduction in solution permeability and lack of water availability in the concrete matrix—due to the presence of CWA crystals. Furthermore, evidence from the self-sealing test suggests that CWA-treated specimens can seal wider cracks and at a faster rate.
format	article
author	Pejman Azarsa Rishi Gupta Peiman Azarsa Alireza Biparva
author_facet	Pejman Azarsa Rishi Gupta Peiman Azarsa Alireza Biparva
author_sort	Pejman Azarsa
title	Durability and Self-Sealing Examination of Concretes Modified with Crystalline Waterproofing Admixtures
title_short	Durability and Self-Sealing Examination of Concretes Modified with Crystalline Waterproofing Admixtures
title_full	Durability and Self-Sealing Examination of Concretes Modified with Crystalline Waterproofing Admixtures
title_fullStr	Durability and Self-Sealing Examination of Concretes Modified with Crystalline Waterproofing Admixtures
title_full_unstemmed	Durability and Self-Sealing Examination of Concretes Modified with Crystalline Waterproofing Admixtures
title_sort	durability and self-sealing examination of concretes modified with crystalline waterproofing admixtures
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/86efcf262b8c4bb9bb008b6449ba11a2
work_keys_str_mv	AT pejmanazarsa durabilityandselfsealingexaminationofconcretesmodifiedwithcrystallinewaterproofingadmixtures AT rishigupta durabilityandselfsealingexaminationofconcretesmodifiedwithcrystallinewaterproofingadmixtures AT peimanazarsa durabilityandselfsealingexaminationofconcretesmodifiedwithcrystallinewaterproofingadmixtures AT alirezabiparva durabilityandselfsealingexaminationofconcretesmodifiedwithcrystallinewaterproofingadmixtures
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Durability and Self-Sealing Examination of Concretes Modified with Crystalline Waterproofing Admixtures

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