Effect of nano-silica as cementitious materials-reducing admixtures on the workability, mechanical properties and durability of concrete

Nano-silica (NS) is one of the most important nanomaterials in recent years. It is used as a new cement-based composite reinforcement in building materials because of its high volcanic ash activity. In order to achieve the goal of carbon peaking and carbon neutralization, combined with the research...

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Autores principales:	Liu Changjiang, Su Xin, Wu Yuyou, Zheng Zhoulian, Yang Bo, Luo Yuanbing, Yang Jingwei, Yang Jiangying
Formato:	article
Lenguaje:	EN
Publicado:	De Gruyter 2021
Materias:	nano-silica cementitious materials-reducing admixture for concrete workability durability pore structure Technology T Chemical technology TP1-1185 Physical and theoretical chemistry QD450-801
Acceso en línea:	https://doaj.org/article/df4f270f6e3b487db04273f763eaccb2
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id	oai:doaj.org-article:df4f270f6e3b487db04273f763eaccb2
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spelling	oai:doaj.org-article:df4f270f6e3b487db04273f763eaccb22021-12-05T14:10:58ZEffect of nano-silica as cementitious materials-reducing admixtures on the workability, mechanical properties and durability of concrete2191-909710.1515/ntrev-2021-0097https://doaj.org/article/df4f270f6e3b487db04273f763eaccb22021-10-01T00:00:00Zhttps://doi.org/10.1515/ntrev-2021-0097https://doaj.org/toc/2191-9097Nano-silica (NS) is one of the most important nanomaterials in recent years. It is used as a new cement-based composite reinforcement in building materials because of its high volcanic ash activity. In order to achieve the goal of carbon peaking and carbon neutralization, combined with the research idea of cementitious materials-reducing admixture for concrete, under the condition of reducing the amount of cement in concrete by 20%, the influence of different dosages of NS on the setting time and mechanical properties of concrete was analyzed. In addition, the shrinkage performance, impermeability, and resistance to chloride-ion permeability of concrete were also studied. The results show that under the same curing conditions and ages, when the NS dosage is 2.5%, the compressive strength and splitting tensile strength of the specimen after 28 days of curing are the highest, reaching 40.87 and 3.8 MPa, which show an increase by 6.6 and 15.15%. The shrinkage performance of concrete increases with the increase in NS dosage. In addition, when the NS dosage is 2.0%, the durability of concrete has also been greatly improved. The impermeability of concrete increased by 18.7% and the resistance to chloride-ion permeability increased by 14.7%. Through microscopic analysis it was found that NS can promote the hydration reaction, generate more hydration products such as calcium silicate hydrate (C–S–H), enhance the interfacial adhesion between the matrix and the aggregate, and form a closer interfacial transition zone. Moreover, the addition of NS also reduces the cumulative pore volume in concrete, refines the pore size, and makes the internal structure of concrete denser.Liu ChangjiangSu XinWu YuyouZheng ZhoulianYang BoLuo YuanbingYang JingweiYang JiangyingDe Gruyterarticlenano-silicacementitious materials-reducing admixture for concreteworkabilitydurabilitypore structureTechnologyTChemical technologyTP1-1185Physical and theoretical chemistryQD450-801ENNanotechnology Reviews, Vol 10, Iss 1, Pp 1395-1409 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	nano-silica cementitious materials-reducing admixture for concrete workability durability pore structure Technology T Chemical technology TP1-1185 Physical and theoretical chemistry QD450-801
spellingShingle	nano-silica cementitious materials-reducing admixture for concrete workability durability pore structure Technology T Chemical technology TP1-1185 Physical and theoretical chemistry QD450-801 Liu Changjiang Su Xin Wu Yuyou Zheng Zhoulian Yang Bo Luo Yuanbing Yang Jingwei Yang Jiangying Effect of nano-silica as cementitious materials-reducing admixtures on the workability, mechanical properties and durability of concrete
description	Nano-silica (NS) is one of the most important nanomaterials in recent years. It is used as a new cement-based composite reinforcement in building materials because of its high volcanic ash activity. In order to achieve the goal of carbon peaking and carbon neutralization, combined with the research idea of cementitious materials-reducing admixture for concrete, under the condition of reducing the amount of cement in concrete by 20%, the influence of different dosages of NS on the setting time and mechanical properties of concrete was analyzed. In addition, the shrinkage performance, impermeability, and resistance to chloride-ion permeability of concrete were also studied. The results show that under the same curing conditions and ages, when the NS dosage is 2.5%, the compressive strength and splitting tensile strength of the specimen after 28 days of curing are the highest, reaching 40.87 and 3.8 MPa, which show an increase by 6.6 and 15.15%. The shrinkage performance of concrete increases with the increase in NS dosage. In addition, when the NS dosage is 2.0%, the durability of concrete has also been greatly improved. The impermeability of concrete increased by 18.7% and the resistance to chloride-ion permeability increased by 14.7%. Through microscopic analysis it was found that NS can promote the hydration reaction, generate more hydration products such as calcium silicate hydrate (C–S–H), enhance the interfacial adhesion between the matrix and the aggregate, and form a closer interfacial transition zone. Moreover, the addition of NS also reduces the cumulative pore volume in concrete, refines the pore size, and makes the internal structure of concrete denser.
format	article
author	Liu Changjiang Su Xin Wu Yuyou Zheng Zhoulian Yang Bo Luo Yuanbing Yang Jingwei Yang Jiangying
author_facet	Liu Changjiang Su Xin Wu Yuyou Zheng Zhoulian Yang Bo Luo Yuanbing Yang Jingwei Yang Jiangying
author_sort	Liu Changjiang
title	Effect of nano-silica as cementitious materials-reducing admixtures on the workability, mechanical properties and durability of concrete
title_short	Effect of nano-silica as cementitious materials-reducing admixtures on the workability, mechanical properties and durability of concrete
title_full	Effect of nano-silica as cementitious materials-reducing admixtures on the workability, mechanical properties and durability of concrete
title_fullStr	Effect of nano-silica as cementitious materials-reducing admixtures on the workability, mechanical properties and durability of concrete
title_full_unstemmed	Effect of nano-silica as cementitious materials-reducing admixtures on the workability, mechanical properties and durability of concrete
title_sort	effect of nano-silica as cementitious materials-reducing admixtures on the workability, mechanical properties and durability of concrete
publisher	De Gruyter
publishDate	2021
url	https://doaj.org/article/df4f270f6e3b487db04273f763eaccb2
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Effect of nano-silica as cementitious materials-reducing admixtures on the workability, mechanical properties and durability of concrete

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