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研究原始石墨烯增强水泥基复合材料力学强度的增强机制及优化用量。

Investigating the reinforcing mechanism and optimized dosage of pristine graphene for enhancing mechanical strengths of cementitious composites.

作者信息

Ho Van Dac, Ng Ching-Tai, Ozbakkaloglu Togay, Karunagaran Ramesh U, Farivar Farzaneh, Goodwin Andy, Guckin Craig Mc, Ho Van Duong, Losic Dusan

机构信息

School of Civil, Environmental and Mining Engineering, The University of Adelaide Australia

School of Chemical Engineering, The University of Adelaide Australia

出版信息

RSC Adv. 2020 Nov 25;10(70):42777-42789. doi: 10.1039/d0ra07639b. eCollection 2020 Nov 23.

DOI:10.1039/d0ra07639b
PMID:35514922
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9057986/
Abstract

The proposed reinforcing mechanism and optimized dosage of pristine graphene (PRG) for enhancing mechanical, physicochemical and microstructural properties of cementitious mortar composites are presented. Five concentrations of PRG and two particle sizes are explored in this study. The results confirmed that the strength of the mortars depends on the dosage of PRG. The PRG sizes have a significant influence on the enhancement rate of mechanical strengths of the mortars, whereas they do not have a significant influence on the optimized PRG dosage for mechanical strengths. The PRG dosage of 0.07% is identified as the optimized content of PRG for enhancing mechanical strengths. The reinforcing mechanism of PRG for cement-based composites is mostly attributed to adhesion friction forces between PRG sheets and cementitious gels, which highly depends on the surface area of PRG sheets. The larger surface area of PRG sheets has a larger friction area associated with cementitious gels suggested to be one of favorable parameters for enhancing mechanical strengths with graphene additives.

摘要

本文提出了原始石墨烯（PRG）增强水泥砂浆复合材料力学、物理化学和微观结构性能的增强机制及优化用量。本研究探讨了五种PRG浓度和两种粒径。结果证实，砂浆强度取决于PRG用量。PRG尺寸对砂浆力学强度的增强速率有显著影响，而对力学强度的PRG优化用量无显著影响。0.07%的PRG用量被确定为增强力学强度的PRG优化含量。PRG对水泥基复合材料的增强机制主要归因于PRG片层与水泥凝胶之间的粘附摩擦力，这高度依赖于PRG片层的表面积。PRG片层较大的表面积与水泥凝胶有较大的摩擦面积，这被认为是使用石墨烯添加剂增强力学强度的有利参数之一。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/36d8/9057986/48a3618325ce/d0ra07639b-f10.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/36d8/9057986/a0932555ecff/d0ra07639b-f8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/36d8/9057986/17db55b785f1/d0ra07639b-f9.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/36d8/9057986/48a3618325ce/d0ra07639b-f10.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/36d8/9057986/4e3b18be4729/d0ra07639b-f1.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/36d8/9057986/7d40c0ffdafe/d0ra07639b-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/36d8/9057986/0d683a59af48/d0ra07639b-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/36d8/9057986/109003c53385/d0ra07639b-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/36d8/9057986/d8009f431721/d0ra07639b-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/36d8/9057986/34b258bdfc61/d0ra07639b-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/36d8/9057986/a0932555ecff/d0ra07639b-f8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/36d8/9057986/17db55b785f1/d0ra07639b-f9.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/36d8/9057986/48a3618325ce/d0ra07639b-f10.jpg

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