Affiliation(s):
Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering, Guilin University of Technology, Guilin 541004, China;
moreAffiliation(s): Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering, Guilin University of Technology, Guilin 541004, China; College of Civil Engineering and Architecture, Guilin University of Technology, Guilin 541004, China; State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; School of Intelligent Construction, Wuchang University of Technology, Wuhan 430002, China; Hydraulic Concrete Institute, China Three Gorges Corporation, Beijing 10038, China; The First Railway Survey and Design Institute Group Corporation, Xi’an 710043, China;
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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,in press.Frontiers of Information Technology & Electronic Engineering,in press.https://doi.org/10.1631/jzus.A2200389
@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", year="in press", publisher="Zhejiang University Press & Springer", doi="https://doi.org/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 %P %@ 1673-565X %D in press %I Zhejiang University Press & Springer doi="https://doi.org/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 SP - EP - %@ 1673-565X Y1 - in press PB - Zhejiang University Press & Springer ER - doi="https://doi.org/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 are mixed to repair damaged structures on coral islands. However, coral sand 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 coral sand 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, then stabilized after long-term immersion in pure water and Na2SO4 solution, showing excellent corrosion resistance. Compared with MKPC river sand mortar, the hydration products of coral sand 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 coral sand 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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