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Physical and Mechanical Properties of Novel Porous Ecological Concrete Based on Magnesium Phosphate Cement

Ecological concrete could reduce the environment impacts of the tremendous construction of infrastructures due to its favorability to plant growth. Nonetheless, the alkalinity of the ecological concrete is usually too high when using ordinary Portland cement (OPC). To solve this problem, the magnesi...

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Autores principales: Zhao, Shuaiyu, Zhang, Dongpo, Li, Yaqiang, Gao, Hang, Meng, Xinmiao
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9655557/
https://www.ncbi.nlm.nih.gov/pubmed/36363112
http://dx.doi.org/10.3390/ma15217521
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author Zhao, Shuaiyu
Zhang, Dongpo
Li, Yaqiang
Gao, Hang
Meng, Xinmiao
author_facet Zhao, Shuaiyu
Zhang, Dongpo
Li, Yaqiang
Gao, Hang
Meng, Xinmiao
author_sort Zhao, Shuaiyu
collection PubMed
description Ecological concrete could reduce the environment impacts of the tremendous construction of infrastructures due to its favorability to plant growth. Nonetheless, the alkalinity of the ecological concrete is usually too high when using ordinary Portland cement (OPC). To solve this problem, the magnesium ammonium phosphate cement (MPC) was used to prepare a novel porous ecological concrete instead of OPC. The pH value and compressive strength of MPC were analyzed and the pore structure was evaluated. The chemical composition and morphology were investigated by an X-ray diffraction test and scanning electron microscope observation. In addition, the void ratio, compressive strength and planting-growing characteristic of MPC-based porous ecological concrete were also studied. The pH value of the MPC suspension ranged from 6.8 to 8.5, which was much lower than that of OPC. The pH value of MPC gradually increased with the increment of phosphorus/magnesium molar ratio (P/M) and the compressive strength reached a maximum value of 49.2 MPa when the P/M value was 1/4. Fly ash (FA) and ground blast furnace slag (GBFS) could improve the pore structure and compressive strength; however, the pH value was slightly increased. As the paste-to-aggregate ratio increased, the void ratio of concrete gradually decreased, while the compressive strength gradually increased. The meadow grass was planted in the MPC-based ecological concrete, and the seeds germinated in one week and showed a better growth status than those planted in the OPC-based ecological concrete.
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spelling pubmed-96555572022-11-15 Physical and Mechanical Properties of Novel Porous Ecological Concrete Based on Magnesium Phosphate Cement Zhao, Shuaiyu Zhang, Dongpo Li, Yaqiang Gao, Hang Meng, Xinmiao Materials (Basel) Article Ecological concrete could reduce the environment impacts of the tremendous construction of infrastructures due to its favorability to plant growth. Nonetheless, the alkalinity of the ecological concrete is usually too high when using ordinary Portland cement (OPC). To solve this problem, the magnesium ammonium phosphate cement (MPC) was used to prepare a novel porous ecological concrete instead of OPC. The pH value and compressive strength of MPC were analyzed and the pore structure was evaluated. The chemical composition and morphology were investigated by an X-ray diffraction test and scanning electron microscope observation. In addition, the void ratio, compressive strength and planting-growing characteristic of MPC-based porous ecological concrete were also studied. The pH value of the MPC suspension ranged from 6.8 to 8.5, which was much lower than that of OPC. The pH value of MPC gradually increased with the increment of phosphorus/magnesium molar ratio (P/M) and the compressive strength reached a maximum value of 49.2 MPa when the P/M value was 1/4. Fly ash (FA) and ground blast furnace slag (GBFS) could improve the pore structure and compressive strength; however, the pH value was slightly increased. As the paste-to-aggregate ratio increased, the void ratio of concrete gradually decreased, while the compressive strength gradually increased. The meadow grass was planted in the MPC-based ecological concrete, and the seeds germinated in one week and showed a better growth status than those planted in the OPC-based ecological concrete. MDPI 2022-10-26 /pmc/articles/PMC9655557/ /pubmed/36363112 http://dx.doi.org/10.3390/ma15217521 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
Zhao, Shuaiyu
Zhang, Dongpo
Li, Yaqiang
Gao, Hang
Meng, Xinmiao
Physical and Mechanical Properties of Novel Porous Ecological Concrete Based on Magnesium Phosphate Cement
title Physical and Mechanical Properties of Novel Porous Ecological Concrete Based on Magnesium Phosphate Cement
title_full Physical and Mechanical Properties of Novel Porous Ecological Concrete Based on Magnesium Phosphate Cement
title_fullStr Physical and Mechanical Properties of Novel Porous Ecological Concrete Based on Magnesium Phosphate Cement
title_full_unstemmed Physical and Mechanical Properties of Novel Porous Ecological Concrete Based on Magnesium Phosphate Cement
title_short Physical and Mechanical Properties of Novel Porous Ecological Concrete Based on Magnesium Phosphate Cement
title_sort physical and mechanical properties of novel porous ecological concrete based on magnesium phosphate cement
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9655557/
https://www.ncbi.nlm.nih.gov/pubmed/36363112
http://dx.doi.org/10.3390/ma15217521
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