TY - JOUR
T1 - Autogenous self-healing of cement with expansive minerals-I
T2 - Impact in early age crack healing
AU - Qureshi, Tanvir
AU - Kanellopoulos, Antonios
AU - Al-Tabbaa, Abir
N1 - © Crown copyright 2018. This manuscript is made available under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International licence (CC BY-NC-ND 4.0). For further details please see: https://creativecommons.org/licenses/by-nc-nd/4.0/
PY - 2018/12/20
Y1 - 2018/12/20
N2 - This study investigates the impact of expansive minerals, namely magnesium oxide, bentonite clay, and quicklime on the early age autogenous self-healing capacity of Portland cement (PC) paste. Individual mineral dosage in PC was studied comprehensively together with several multiple mineral combinations. The study also covers a brief state of the art on autogenous self-healing and the use of minerals. The healing performance was compared using flexural strength recovery, crack sealing, and permeability tests. Materials microstructural investigations were carried out using XRD, TGA and SEM-EDX. The hydrated and swelling products of expansive minerals have effectively contributed to the production of healing materials. Cracks in the range of 180 µm healed efficiently in a mineral containing mixes within 28 days. Self-healing recovery was triggered through the crack bridging (strength recovery), sealing (physical closer of cracks through crystallisation) and durability performance improvement.
AB - This study investigates the impact of expansive minerals, namely magnesium oxide, bentonite clay, and quicklime on the early age autogenous self-healing capacity of Portland cement (PC) paste. Individual mineral dosage in PC was studied comprehensively together with several multiple mineral combinations. The study also covers a brief state of the art on autogenous self-healing and the use of minerals. The healing performance was compared using flexural strength recovery, crack sealing, and permeability tests. Materials microstructural investigations were carried out using XRD, TGA and SEM-EDX. The hydrated and swelling products of expansive minerals have effectively contributed to the production of healing materials. Cracks in the range of 180 µm healed efficiently in a mineral containing mixes within 28 days. Self-healing recovery was triggered through the crack bridging (strength recovery), sealing (physical closer of cracks through crystallisation) and durability performance improvement.
KW - Bentonite clay
KW - Crack bridging
KW - Crystallisation
KW - Durability improvement
KW - Magnesium oxide (MgO)
KW - Quicklime
KW - Strength recovery
UR - http://www.scopus.com/inward/record.url?scp=85055665482&partnerID=8YFLogxK
U2 - 10.1016/j.conbuildmat.2018.10.143
DO - 10.1016/j.conbuildmat.2018.10.143
M3 - Article
AN - SCOPUS:85055665482
SN - 0950-0618
VL - 192
SP - 768
EP - 784
JO - Construction and Building Materials
JF - Construction and Building Materials
ER -