The Influence of Fly Ash Content on the Compressive Strength of Cemented Sand and Gravel Material

Cemented sand and gravel (CSG) material is a new type of dam material developed on the basis of roller compacted concrete, hardfill, and ultra-poor cementing materials. Its main feature is a wide range of sources of aggregate (aggregate is not screened but by simply removing the large particles it c...

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Autores principales:	Qihui Chai, Fang Wan, Lingfeng Xiao, Feng Wu
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	cementitious gravel fly ash age optimal dosage Crystallography QD901-999
Acceso en línea:	https://doaj.org/article/d0b21b82beef4251be48a0a7438041c8
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spelling	oai:doaj.org-article:d0b21b82beef4251be48a0a7438041c82021-11-25T17:19:41ZThe Influence of Fly Ash Content on the Compressive Strength of Cemented Sand and Gravel Material10.3390/cryst111114262073-4352https://doaj.org/article/d0b21b82beef4251be48a0a7438041c82021-11-01T00:00:00Zhttps://www.mdpi.com/2073-4352/11/11/1426https://doaj.org/toc/2073-4352Cemented sand and gravel (CSG) material is a new type of dam material developed on the basis of roller compacted concrete, hardfill, and ultra-poor cementing materials. Its main feature is a wide range of sources of aggregate (aggregate is not screened but by simply removing the large particles it can be fully graded on the dam filling) and low amounts of cementitious materials per unit volume. This dam construction material is not only economical and practical, but also green and environmentally friendly. There are many factors affecting the mechanical properties of CSG materials, such as aggregate gradation, sand ratio, water content, water–binder ratio, fly ash content, admixture content, etc. Based on the existing research results of the team, this paper focuses on the influence of fly ash content on the compressive strength of CSG materials. Through a large number of laboratory measured data, we found: (1) The compressive strength law of materials at different ages; the compressive strength of CSG material at age 90 d is generally 10%~30% higher than that at 28 d, and it is proposed that 90 d or 180 d strength should be used as the design strength in the design of CSG material dam; (2) There is an optimal value of fly ash content in CSG materials: when the fly ash content is 50% of the total amount of cementitious materials (cement + fly ash), the fly ash content is defined as the optimal content, and the test data are verified by regression analysis. The discovery of an ‘optimal dosage’ of fly ash provides an important reference for the design and construction of CSG dams.Qihui ChaiFang WanLingfeng XiaoFeng WuMDPI AGarticlecementitious gravelfly ashageoptimal dosageCrystallographyQD901-999ENCrystals, Vol 11, Iss 1426, p 1426 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	cementitious gravel fly ash age optimal dosage Crystallography QD901-999
spellingShingle	cementitious gravel fly ash age optimal dosage Crystallography QD901-999 Qihui Chai Fang Wan Lingfeng Xiao Feng Wu The Influence of Fly Ash Content on the Compressive Strength of Cemented Sand and Gravel Material
description	Cemented sand and gravel (CSG) material is a new type of dam material developed on the basis of roller compacted concrete, hardfill, and ultra-poor cementing materials. Its main feature is a wide range of sources of aggregate (aggregate is not screened but by simply removing the large particles it can be fully graded on the dam filling) and low amounts of cementitious materials per unit volume. This dam construction material is not only economical and practical, but also green and environmentally friendly. There are many factors affecting the mechanical properties of CSG materials, such as aggregate gradation, sand ratio, water content, water–binder ratio, fly ash content, admixture content, etc. Based on the existing research results of the team, this paper focuses on the influence of fly ash content on the compressive strength of CSG materials. Through a large number of laboratory measured data, we found: (1) The compressive strength law of materials at different ages; the compressive strength of CSG material at age 90 d is generally 10%~30% higher than that at 28 d, and it is proposed that 90 d or 180 d strength should be used as the design strength in the design of CSG material dam; (2) There is an optimal value of fly ash content in CSG materials: when the fly ash content is 50% of the total amount of cementitious materials (cement + fly ash), the fly ash content is defined as the optimal content, and the test data are verified by regression analysis. The discovery of an ‘optimal dosage’ of fly ash provides an important reference for the design and construction of CSG dams.
format	article
author	Qihui Chai Fang Wan Lingfeng Xiao Feng Wu
author_facet	Qihui Chai Fang Wan Lingfeng Xiao Feng Wu
author_sort	Qihui Chai
title	The Influence of Fly Ash Content on the Compressive Strength of Cemented Sand and Gravel Material
title_short	The Influence of Fly Ash Content on the Compressive Strength of Cemented Sand and Gravel Material
title_full	The Influence of Fly Ash Content on the Compressive Strength of Cemented Sand and Gravel Material
title_fullStr	The Influence of Fly Ash Content on the Compressive Strength of Cemented Sand and Gravel Material
title_full_unstemmed	The Influence of Fly Ash Content on the Compressive Strength of Cemented Sand and Gravel Material
title_sort	influence of fly ash content on the compressive strength of cemented sand and gravel material
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/d0b21b82beef4251be48a0a7438041c8
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The Influence of Fly Ash Content on the Compressive Strength of Cemented Sand and Gravel Material

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