Strain-rate sensitivity of cement composites: Insights from field's metal nano-inclusions

IF 10.9 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement and Concrete Research Pub Date : 2023-09-01 DOI:10.1016/j.cemconres.2023.107210

Navid Tourani, Kwesi Sagoe-Crentsil, Wenhui Duan

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引用次数: 0

Abstract

In this study, we investigated the effects of Field's metal (FM) nanoparticles (NPs) on the mechanical behaviour of cement paste under quasi-static (QS) and dynamic strain rates. We found the highest mechanical improvement under QS loading with 1 % FM dosage, beyond which boosting the dosage diminished its contribution to the mechanical performance. Conversely, under dynamic loadings, boosting the dosage from 1 % to 4 % FM significantly and progressively enhanced the overall mechanical performance. These results indicated that the mechanical impacts that ensue from the microstructural modification effects of FM differ with dosage and strain rates. Under QS loading, the pore-refining effect of the NPs was predominant, whereas, under dynamic loadings, the reinforcing effect of the NPs was the primary factor. Furthermore, by comparing the effects of FM and nanosilica NPs, our findings underscored the pronounced effect of the nanomaterial physical and mechanical properties on the strain-rate sensitivity of cementitious nanocomposites.

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水泥复合材料的应变率敏感性:来自现场金属纳米夹杂物的见解

在这项研究中，我们研究了Field's金属纳米颗粒(FM)对准静态(QS)和动态应变速率下水泥浆体力学行为的影响。结果表明，当FM添加量为1%时，QS载荷下的机械性能改善最大，超过此水平后，FM添加量的增加对机械性能的贡献减小。相反，在动态载荷下，将掺量从1%增加到4%显著提高整体力学性能。这些结果表明，FM的微观组织改性效应所产生的力学影响随剂量和应变速率的不同而不同。在QS加载条件下，NPs的补强作用起主导作用，而在动加载条件下，NPs的补强作用起主导作用。此外，通过比较FM和纳米二氧化硅NPs的影响，我们的发现强调了纳米材料的物理力学性能对胶凝纳米复合材料应变速率敏感性的显著影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Cement and Concrete Research 工程技术-材料科学：综合

CiteScore

20.90

自引率

12.30%

发文量

318

审稿时长

53 days

期刊介绍： Cement and Concrete Research is dedicated to publishing top-notch research on the materials science and engineering of cement, cement composites, mortars, concrete, and related materials incorporating cement or other mineral binders. The journal prioritizes reporting significant findings in research on the properties and performance of cementitious materials. It also covers novel experimental techniques, the latest analytical and modeling methods, examination and diagnosis of actual cement and concrete structures, and the exploration of potential improvements in materials.