Cargando…

Mechanical Properties and Damage Layer Thickness of Green Concrete under a Low-Temperature Environment

To study the influence of mineral admixtures on concrete’s mechanical properties after a low-temperature exposure, green concrete was prepared by mixing fly ash and slag at different replacement rates. By analysing the changes to concrete’s mechanical properties and the damage layer thickness under...

Descripción completa

Detalles Bibliográficos
Autores principales: Zhang, Dongsheng, Zhang, Tianhao, Yang, Qiuning
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9657105/
https://www.ncbi.nlm.nih.gov/pubmed/36363001
http://dx.doi.org/10.3390/ma15217409
_version_ 1784829607872036864
author Zhang, Dongsheng
Zhang, Tianhao
Yang, Qiuning
author_facet Zhang, Dongsheng
Zhang, Tianhao
Yang, Qiuning
author_sort Zhang, Dongsheng
collection PubMed
description To study the influence of mineral admixtures on concrete’s mechanical properties after a low-temperature exposure, green concrete was prepared by mixing fly ash and slag at different replacement rates. By analysing the changes to concrete’s mechanical properties and the damage layer thickness under different ambient temperatures (20, −10, −20, −30, and −40 °C), the change rule of concrete at low temperatures was explored. The results revealed that the compressive strength of concrete, containing either fly ash or slag, peaked at 30 °C; moreover, the slag concrete’s flexural and splitting tensile strength peaked at −40 °C. The best mechanical properties were observed for a fly ash-to-slag ratio of 1:2 (F10S20; i.e., 10% fly ash and 20% slag) and its compressive strength at different temperatures was higher than that of concrete, containing 30% fly ash (F30) or 30% slag (S30), but the flexural and splitting tensile strength was lower than S30. Further, as the temperature decreased, the fly ash concrete’s damaged layer thickness gradually increased. When the content of fly ash and slag were both 15% (F15S15), the damaged layer thickness was minimal at different low temperatures, especially at −30 °C, where the thickness was only 8.31 mm.
format Online
Article
Text
id pubmed-9657105
institution National Center for Biotechnology Information
language English
publishDate 2022
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-96571052022-11-15 Mechanical Properties and Damage Layer Thickness of Green Concrete under a Low-Temperature Environment Zhang, Dongsheng Zhang, Tianhao Yang, Qiuning Materials (Basel) Article To study the influence of mineral admixtures on concrete’s mechanical properties after a low-temperature exposure, green concrete was prepared by mixing fly ash and slag at different replacement rates. By analysing the changes to concrete’s mechanical properties and the damage layer thickness under different ambient temperatures (20, −10, −20, −30, and −40 °C), the change rule of concrete at low temperatures was explored. The results revealed that the compressive strength of concrete, containing either fly ash or slag, peaked at 30 °C; moreover, the slag concrete’s flexural and splitting tensile strength peaked at −40 °C. The best mechanical properties were observed for a fly ash-to-slag ratio of 1:2 (F10S20; i.e., 10% fly ash and 20% slag) and its compressive strength at different temperatures was higher than that of concrete, containing 30% fly ash (F30) or 30% slag (S30), but the flexural and splitting tensile strength was lower than S30. Further, as the temperature decreased, the fly ash concrete’s damaged layer thickness gradually increased. When the content of fly ash and slag were both 15% (F15S15), the damaged layer thickness was minimal at different low temperatures, especially at −30 °C, where the thickness was only 8.31 mm. MDPI 2022-10-22 /pmc/articles/PMC9657105/ /pubmed/36363001 http://dx.doi.org/10.3390/ma15217409 Text en © 2022 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
Zhang, Dongsheng
Zhang, Tianhao
Yang, Qiuning
Mechanical Properties and Damage Layer Thickness of Green Concrete under a Low-Temperature Environment
title Mechanical Properties and Damage Layer Thickness of Green Concrete under a Low-Temperature Environment
title_full Mechanical Properties and Damage Layer Thickness of Green Concrete under a Low-Temperature Environment
title_fullStr Mechanical Properties and Damage Layer Thickness of Green Concrete under a Low-Temperature Environment
title_full_unstemmed Mechanical Properties and Damage Layer Thickness of Green Concrete under a Low-Temperature Environment
title_short Mechanical Properties and Damage Layer Thickness of Green Concrete under a Low-Temperature Environment
title_sort mechanical properties and damage layer thickness of green concrete under a low-temperature environment
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9657105/
https://www.ncbi.nlm.nih.gov/pubmed/36363001
http://dx.doi.org/10.3390/ma15217409
work_keys_str_mv AT zhangdongsheng mechanicalpropertiesanddamagelayerthicknessofgreenconcreteunderalowtemperatureenvironment
AT zhangtianhao mechanicalpropertiesanddamagelayerthicknessofgreenconcreteunderalowtemperatureenvironment
AT yangqiuning mechanicalpropertiesanddamagelayerthicknessofgreenconcreteunderalowtemperatureenvironment