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Effect of Different Fine Aggregate Characteristics on Fracture Toughness and Microstructure of Sand Concrete

The fracture toughness of sand concrete is affected by aggregate characteristics. In order to study the possibility of exploiting tailings sand, available in large quantities in sand concrete, and find an approach to improve the toughness of sand concrete by selecting appropriate fine aggregate. Thr...

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Autores principales: Sun, Zhihua, Xiong, Jin, Cao, Shubo, Zhu, Jianxiong, Jia, Xuzhi, Hu, Zhigang, Liu, Kaiping
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10004425/
https://www.ncbi.nlm.nih.gov/pubmed/36903197
http://dx.doi.org/10.3390/ma16052080
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author Sun, Zhihua
Xiong, Jin
Cao, Shubo
Zhu, Jianxiong
Jia, Xuzhi
Hu, Zhigang
Liu, Kaiping
author_facet Sun, Zhihua
Xiong, Jin
Cao, Shubo
Zhu, Jianxiong
Jia, Xuzhi
Hu, Zhigang
Liu, Kaiping
author_sort Sun, Zhihua
collection PubMed
description The fracture toughness of sand concrete is affected by aggregate characteristics. In order to study the possibility of exploiting tailings sand, available in large quantities in sand concrete, and find an approach to improve the toughness of sand concrete by selecting appropriate fine aggregate. Three distinct fine aggregates have been used. After characterizing the fine aggregate used, the mechanical properties were tested to characterize the toughness of sand concrete, the box-counting fractal dimensions were calculated to analyze the roughness of fracture surfaces, and the microstructure was tested to observe the path and width of microcracks and hydration products in sand concrete. The results show that the mineral composition of fine aggregates is close, but their fineness modulus, fine aggregate angularity (FAA) and gradation vary considerably; FAA has a significant impact on the fracture toughness of sand concrete. The higher the FAA value, the more resistant it is to crack expansion; with the FAA values of from 32 s to 44 s, the microcrack width in sand concrete was reduced from 0.25 um to 0.14 um; The fracture toughness and microstructure of sand concrete are also related to the gradation of fine aggregates, the better gradation can improve the performance of the interfacial transition zone (ITZ). The hydration products in the ITZ are also different because more reasonable gradation of aggregates reduces the voids between the fine aggregates and the cement paste and restrains the full growth of crystals. These results demonstrate that sand concrete has promising applications in the field of construction engineering.
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spelling pubmed-100044252023-03-11 Effect of Different Fine Aggregate Characteristics on Fracture Toughness and Microstructure of Sand Concrete Sun, Zhihua Xiong, Jin Cao, Shubo Zhu, Jianxiong Jia, Xuzhi Hu, Zhigang Liu, Kaiping Materials (Basel) Article The fracture toughness of sand concrete is affected by aggregate characteristics. In order to study the possibility of exploiting tailings sand, available in large quantities in sand concrete, and find an approach to improve the toughness of sand concrete by selecting appropriate fine aggregate. Three distinct fine aggregates have been used. After characterizing the fine aggregate used, the mechanical properties were tested to characterize the toughness of sand concrete, the box-counting fractal dimensions were calculated to analyze the roughness of fracture surfaces, and the microstructure was tested to observe the path and width of microcracks and hydration products in sand concrete. The results show that the mineral composition of fine aggregates is close, but their fineness modulus, fine aggregate angularity (FAA) and gradation vary considerably; FAA has a significant impact on the fracture toughness of sand concrete. The higher the FAA value, the more resistant it is to crack expansion; with the FAA values of from 32 s to 44 s, the microcrack width in sand concrete was reduced from 0.25 um to 0.14 um; The fracture toughness and microstructure of sand concrete are also related to the gradation of fine aggregates, the better gradation can improve the performance of the interfacial transition zone (ITZ). The hydration products in the ITZ are also different because more reasonable gradation of aggregates reduces the voids between the fine aggregates and the cement paste and restrains the full growth of crystals. These results demonstrate that sand concrete has promising applications in the field of construction engineering. MDPI 2023-03-03 /pmc/articles/PMC10004425/ /pubmed/36903197 http://dx.doi.org/10.3390/ma16052080 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Sun, Zhihua
Xiong, Jin
Cao, Shubo
Zhu, Jianxiong
Jia, Xuzhi
Hu, Zhigang
Liu, Kaiping
Effect of Different Fine Aggregate Characteristics on Fracture Toughness and Microstructure of Sand Concrete
title Effect of Different Fine Aggregate Characteristics on Fracture Toughness and Microstructure of Sand Concrete
title_full Effect of Different Fine Aggregate Characteristics on Fracture Toughness and Microstructure of Sand Concrete
title_fullStr Effect of Different Fine Aggregate Characteristics on Fracture Toughness and Microstructure of Sand Concrete
title_full_unstemmed Effect of Different Fine Aggregate Characteristics on Fracture Toughness and Microstructure of Sand Concrete
title_short Effect of Different Fine Aggregate Characteristics on Fracture Toughness and Microstructure of Sand Concrete
title_sort effect of different fine aggregate characteristics on fracture toughness and microstructure of sand concrete
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10004425/
https://www.ncbi.nlm.nih.gov/pubmed/36903197
http://dx.doi.org/10.3390/ma16052080
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