Investigation of the Mechanical Physical Properties of Fly Ash Modified Magnesium Phosphate Cement Repair Mortar Cured at Varying Temperatures

To meet the material requirements for repairing cracked components serving in cold temperatures, the differences in the setting hardening characteristics and physical and mechanical properties of fly ash-modified magnesium phosphate cement (MPC) repair mortar cured at 0 °C and 20 °C were comparative...

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Bibliographic Details
Published inBuildings (Basel) Vol. 13; no. 1; p. 88
Main Authors Liu, Junxia, Yuan, Mengtian, Hai, Ran, Yang, Fei, Zhang, Jingyu, Li, Anbang
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.01.2023
Subjects
Bonding strength
Cement
Compressive strength
Curing
curing temperature
drying shrinkage
Flexural strength
Fluidity
Fly ash
Humidity
Hydration
Interfacial bonding
Magnesium
Magnesium phosphate
magnesium phosphate cement
Mechanical properties
Mortars (material)
Particle size
Phosphates
Physical properties
Retention
Setting (hardening)
Temperature
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Summary:To meet the material requirements for repairing cracked components serving in cold temperatures, the differences in the setting hardening characteristics and physical and mechanical properties of fly ash-modified magnesium phosphate cement (MPC) repair mortar cured at 0 °C and 20 °C were comparatively studied in this paper. The results show that under the same fly ash content, the compressive strength of MPC repair mortar cured at 0 °C is lower than that cured at 20 °C, and the setting time, fluidity, flexural strength, interfacial bonding strength, strength retention rate, and linear shrinkage rate are not significantly deteriorated. The above properties of MPC repair mortar vary with the increase in the fly ash content but still, remain appropriate when the fly ash content is not higher than 15 wt%. The microstructure of MPC is obviously refined when the content of fly ash is 10 wt%. Therefore, the MPC repair mortar cured at 0 °C and 20 °C has good physical and mechanical properties. In particular, the flexural strength and interfacial bonding strength of the specimens cured at 0 °C are higher than that cured at 20 °C at all curing ages, and at the curing age of 3 days, those are 7.9 MPa and 5.4 MPa, respectively.
ISSN:2075-5309
2075-5309
DOI:10.3390/buildings13010088