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

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F24%3A00376598" target="_blank" >RIV/68407700:21110/24:00376598 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68378271:_____/24:00602025 RIV/61989592:15310/24:73626945

Výsledek na webu

<a href="https://doi.org/10.1016/j.cemconres.2024.107623" target="_blank" >https://doi.org/10.1016/j.cemconres.2024.107623</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.cemconres.2024.107623" target="_blank" >10.1016/j.cemconres.2024.107623</a>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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 MPa m^1/2 for the outer product, 0.64 ± 0.05 MPa m^1/2 for the inner product, 0.66 ± 0.06 MPa m^1/2 for Portlandite, and 1.24 ± 0.20 MPa m^1/2 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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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 MPa m^1/2 for the outer product, 0.64 ± 0.05 MPa m^1/2 for the inner product, 0.66 ± 0.06 MPa m^1/2 for Portlandite, and 1.24 ± 0.20 MPa m^1/2 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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20101 - Civil engineering

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Cement and Concrete Research

ISSN

0008-8846

e-ISSN

1873-3948

Svazek periodika

185

Číslo periodika v rámci svazku

107623

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

22

Strana od-do

—

Kód UT WoS článku

001291486400001

EID výsledku v databázi Scopus

2-s2.0-85201383201