TY - JOUR
T1 - Locating ettringite due to DEF at the pore scale of cement paste by heat-based dissolution tests
AU - Gu, Yushan
AU - Omikrine-Metalssi, Othman
AU - Martin, Renaud-Pierre
AU - Fen-Chong, Teddy
AU - Dangla, Patrick
PY - 2020
Y1 - 2020
N2 - An innovative experimental method, based on the thermal stability of ettringite, is proposed and implemented to dissolve the crystalline products formed during Delayed Ettringite Formation (DEF). The tests are designed to empty all the pores that are filled by ettringite during their formation. By characterising the porous structure before and after the heat-based dissolution test (HBDT) via Mercury Intrusion Porosimetry (MIP), it is proved that the pores filled by ettringite during DEF in the pore size range between 4 and 30 nm are emptied and that the pore size distribution (PSD) in this range is reversed, approaching the initial state (i.e. before the degradation induced by DEF). This observation helps to confirm the location of ettringite formed during DEF.
AB - An innovative experimental method, based on the thermal stability of ettringite, is proposed and implemented to dissolve the crystalline products formed during Delayed Ettringite Formation (DEF). The tests are designed to empty all the pores that are filled by ettringite during their formation. By characterising the porous structure before and after the heat-based dissolution test (HBDT) via Mercury Intrusion Porosimetry (MIP), it is proved that the pores filled by ettringite during DEF in the pore size range between 4 and 30 nm are emptied and that the pore size distribution (PSD) in this range is reversed, approaching the initial state (i.e. before the degradation induced by DEF). This observation helps to confirm the location of ettringite formed during DEF.
UR - http://www.scopus.com/inward/record.url?scp=85089809141&partnerID=8YFLogxK
U2 - 10.1016/j.conbuildmat.2020.120000
DO - 10.1016/j.conbuildmat.2020.120000
M3 - Article
SN - 0950-0618
VL - 258
JO - Construction and Building Materials
JF - Construction and Building Materials
M1 - 120000
ER -