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On-line Access: 2024-08-27
Received: 2023-10-17
Revision Accepted: 2024-05-08
Crosschecked: 2024-02-01
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Citations: Bibtex RefMan EndNote GB/T7714
Hao LIU, Huamei YANG, Houzhen WEI, Jining YU, Qingshan MENG, Rongtao YAN. Effect of coral sand on the mechanical properties and hydration mechanism of magnesium potassium phosphate cement mortar[J]. Journal of Zhejiang University Science A, 2024, 25(2): 116-129.
@article{title="Effect of coral sand on the mechanical properties and hydration mechanism of magnesium potassium phosphate cement mortar",
author="Hao LIU, Huamei YANG, Houzhen WEI, Jining YU, Qingshan MENG, Rongtao YAN",
journal="Journal of Zhejiang University Science A",
volume="25",
number="2",
pages="116-129",
year="2024",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A2200389"
}
%0 Journal Article
%T Effect of coral sand on the mechanical properties and hydration mechanism of magnesium potassium phosphate cement mortar
%A Hao LIU
%A Huamei YANG
%A Houzhen WEI
%A Jining YU
%A Qingshan MENG
%A Rongtao YAN
%J Journal of Zhejiang University SCIENCE A
%V 25
%N 2
%P 116-129
%@ 1673-565X
%D 2024
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A2200389
TY - JOUR
T1 - Effect of coral sand on the mechanical properties and hydration mechanism of magnesium potassium phosphate cement mortar
A1 - Hao LIU
A1 - Huamei YANG
A1 - Houzhen WEI
A1 - Jining YU
A1 - Qingshan MENG
A1 - Rongtao YAN
J0 - Journal of Zhejiang University Science A
VL - 25
IS - 2
SP - 116
EP - 129
%@ 1673-565X
Y1 - 2024
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A2200389
Abstract: Damaged structures on coral islands have been spalling and cracking due to the dual corrosion of tides and waves. To ensure easy access to aggregate materials, magnesium potassium phosphate cement (MKPC) and coral sand (CS) are mixed to repair damaged structures on coral islands. However, CS is significantly different from land-sourced sand in mineral composition, particle morphology, and strength. This has a substantial impact on the hydration characteristics and macroscopic properties of MKPC mortar. Therefore, in this study we investigated the compressive strength, interfacial mechanical properties, and corrosion resistance of MKPC CS mortar. Changes in the morphology, microstructure, and relative contents of hydration products were revealed by scanning electron microscope-energy dispersive spectrometer (SEM-EDS) and X-ray diffraction (XRD). The results indicated that the compressive strength increased linearly with the interfacial micro-hardness, and then stabilized after long-term immersion in pure water and Na2SO4 solution, showing excellent corrosion resistance. Compared with MKPC river sand (RS) mortar, the hydration products of CS mortar were an intermediate product 6KPO2·8H2O with a relative content of 3.9% at 1 h and 4.1% at 12 h. The hydration product MgKPO4·6H2O increased rapidly after 7-d curing, with an increased growth rate of 1100%. Our results showed that CS promoted the nucleation and formation of hydration products of MKPC, resulting in better crystallinity, tighter overlapping, and a denser interfacial transition zone. The results of this study provide technical support for applying MKPC mortar as a rapid repair material for damaged structures on coral islands.
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