Fracture toughness of cement paste constituents assessed by micro-scratching correlated with acoustic emission

IF 10.9 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Jiří Němeček , Radim Čtvrtlík , Lukáš Václavek , Jiří Němeček
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引用次数: 0

Abstract

The fracture toughness of cement paste is difficult to quantify both by standard nanoindentation tests and by time-consuming and expensive measurements on micro-specimens milled with a focused ion beam. Here, a well-calibrated scratch test with simultaneous recording of acoustic emission signals was used to quickly and easily provide statistically relevant quantitative results for a wide range of scales (1–100 µm). The microscale fracture toughness for the main hydration products reached 0.54 ± 0.03 MPam1/2 for the outer product, 0.64 ± 0.05 MPam1/2 for the inner product, 0.66 ± 0.06 MPam1/2 for Portlandite, and 1.24 ± 0.20 MPam1/2 for clinker on well-hydrated sample. Two primary deformation mechanisms inherent in the micro-scratch process, material compaction and “ripping off”, were identified and their impact on fracture toughness and friction coefficient was quantified. Simulation of cracking and damage mechanisms, plus estimation of the otherwise unavailable tensile strength of compacted cement paste constituents, were successfully modeled using a Griffith-type fracture model.

通过与声发射相关的微划痕评估水泥浆成分的断裂韧性
水泥浆的断裂韧性很难通过标准的纳米压痕测试和耗时且昂贵的聚焦离子束铣削微试样测量来量化。在这里,我们采用了一种校准良好的划痕试验,同时记录声发射信号,可快速、轻松地提供各种尺度(1-100 微米)的统计相关定量结果。在水化良好的样品上,主要水化产物的微尺度断裂韧性分别为:外层产物 0.54 ± 0.03 MPam,内层产物 0.64 ± 0.05 MPam,波长石 0.66 ± 0.06 MPam,熟料 1.24 ± 0.20 MPam。确定了微划痕过程中固有的两种主要变形机制,即材料压实和 "撕裂",并量化了它们对断裂韧性和摩擦系数的影响。利用格里菲斯型断裂模型成功模拟了开裂和破坏机制,并估算了压实水泥浆成分的拉伸强度。
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来源期刊
Cement and Concrete Research
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.
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