TY - JOUR
T1 - Strengthening the bulk properties of cement mortar through promoted in-situ formation of hydroxyapatite
T2 - Feasibility and perspectives
AU - Miah, Md Jihad
AU - Thygesen, Jesper
AU - Simonsen, Morten Enggrob
AU - Nielsen, Rudi Pankratz
AU - Wu, Min
N1 - Publisher Copyright:
© 2024 The Authors
PY - 2025/1
Y1 - 2025/1
N2 - Hydroxyapatite (HAP) formation could be a convincing surface treatment for marble/limestone and cement-based materials, leading to augmented properties, while the effects on the bulk material properties have not been verified. In this study, in-situ HAP formation was promoted by completely immersing cement mortar specimens in aqueous diammonium hydrogen phosphate (DAP) solutions with different molar concentrations (0.10 M to 2 M) and treatment reaction time (1–28 days). The assessment properties included compressive strength, ultrasonic pulse velocity, voids, and water penetration. The outcomes demonstrated that compared with the untreated (UT) specimens, compressive strength augmented significantly (6–45 % higher than UT) for all specimens treated with DAP solution in all molar concentrations and reaction times, which aligned with registered higher ultrasonic pulse velocity (UPV) values (2–13 % higher than UT). In contrast, dramatic reduction in voids (1–16 % lower than UT), water absorption (7–25 % lower than UT), and water penetration were reported for treated specimens than UT ones. Comprehensive analyses including TGA, FTIR, XRD tests and thermodynamic modeling revealed that formation of HAP was the main mechanism, despite the limited amount detected in the studied specimens. DAP penetration depth and slow reaction kinetics of HAP formation were considered the major bottlenecks for more robust bulk property improvement.
AB - Hydroxyapatite (HAP) formation could be a convincing surface treatment for marble/limestone and cement-based materials, leading to augmented properties, while the effects on the bulk material properties have not been verified. In this study, in-situ HAP formation was promoted by completely immersing cement mortar specimens in aqueous diammonium hydrogen phosphate (DAP) solutions with different molar concentrations (0.10 M to 2 M) and treatment reaction time (1–28 days). The assessment properties included compressive strength, ultrasonic pulse velocity, voids, and water penetration. The outcomes demonstrated that compared with the untreated (UT) specimens, compressive strength augmented significantly (6–45 % higher than UT) for all specimens treated with DAP solution in all molar concentrations and reaction times, which aligned with registered higher ultrasonic pulse velocity (UPV) values (2–13 % higher than UT). In contrast, dramatic reduction in voids (1–16 % lower than UT), water absorption (7–25 % lower than UT), and water penetration were reported for treated specimens than UT ones. Comprehensive analyses including TGA, FTIR, XRD tests and thermodynamic modeling revealed that formation of HAP was the main mechanism, despite the limited amount detected in the studied specimens. DAP penetration depth and slow reaction kinetics of HAP formation were considered the major bottlenecks for more robust bulk property improvement.
KW - Cement mortar Diammonium hydrogen phosphate
KW - Hydroxyapatite
KW - Microstructural properties
KW - Mineral compositions
KW - Thermodynamic modeling
UR - http://www.scopus.com/inward/record.url?scp=85214264152&partnerID=8YFLogxK
U2 - 10.1016/j.conbuildmat.2024.139773
DO - 10.1016/j.conbuildmat.2024.139773
M3 - Journal article
AN - SCOPUS:85214264152
SN - 0950-0618
VL - 459
JO - Construction and Building Materials
JF - Construction and Building Materials
M1 - 139773
ER -