Acoustic emission monitoring of crack formation during alkali silicanreactivity accelerated mortar bar test

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985831%3A_____%2F17%3A00475320" target="_blank" >RIV/67985831:_____/17:00475320 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1016/j.enggeo.2017.02.009" target="_blank" >http://dx.doi.org/10.1016/j.enggeo.2017.02.009</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.enggeo.2017.02.009" target="_blank" >10.1016/j.enggeo.2017.02.009</a>

Result language

angličtina

Original language name

Acoustic emission monitoring of crack formation during alkali silicanreactivity accelerated mortar bar test

Original language description

System of semi-continuous ultrasonic sounding and acoustic emission (AE) monitoring of experimental mortar bars subjected to ultra-accelerated (14-days lasting) alkali -silica reactivity (ASR) test was developed and assessed for refined interpretation of early stages of reaction. The experiments were carried out by using four different types of crushed stone (quartz from pegmatite, chert, quartzite, quartz-rich metagreywacke) exhibiting variable ASR potential from non-reactive to reactive. By analysing AE characteristics, these faithfully reflect microstructural changes during the first 3-5 days of the test. Early formation of ASR damage phenomena within aggregate particles showing variable ASR potential is accompanied with non-linear interaction of propagating or released acoustic waves. During the second half of the test, rapid attenuation of AE activity, specifically in the case of the two most reactive types of aggregates (quartz metagreywacke and chert), reflects deterioration of the (micro) structure of tested materials and decrease of quality of contacts between steel wave guides and experimental mortar bars. The later fact presents major limitation of current approach during later stages of ultra accelerated mortar bar test. Despite this limitation, ultrasonic sounding and AE monitoring seems to be much more sensitive to early stages of development of brittle damage phenomena due to ASR than standard dilation reading is. This has been confirmed by subsequent direct observation of damage phenomena by backscattered imaging in scanning electron microscope.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

20501 - Materials engineering

Project

<a href="/en/project/GAP104%2F12%2F0915" target="_blank" >GAP104/12/0915: Quantitative analysis of quartz deformation affecting ASR in concrete</a><br>

Continuities

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

Publication year

2017

Confidentiality

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

Name of the periodical

Engineering Geology

ISSN

0013-7952

e-ISSN

—

Volume of the periodical

220

Issue of the periodical within the volume

MAR 30

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

8

Pages from-to

175-182

UT code for WoS article

000398872200017

EID of the result in the Scopus database

2-s2.0-85013243629