This work studies the mechanical properties and durability of the ordinary Portland cement (OPC) and sulfoaluminate cement (SAC) binary system incorporated with metakaolin. Several tests are carried out to investigate the compressive and flexural strength, fresh performance including setting time and fluidity, resistance to sulfate attack, mass loss rate after 100 freeze-thaw cycles, and strength loss rate of the cement system with different ratios. The test results show that when the OPC and SAC are mixed with 7.5:2.5 and then the mixture is added with 10% metakaolin, the repairing and strengthening material with higher bonding strength can be prepared. After adding metakaolin, the interface accumulation form of the hydration product phase of SAC can be improved to combine with the existing hardened mortar to meet the requirements of repair and reinforcement. The system which has a short setting time, can be quickly repaired and strengthened and overcomes the defect of late strength shrinkage of SAC. At the same time, the sulfate attack resistance and frost resistance of composite mortar systems mixed with SAC and OPC can be enhanced by the added metakaolin. By referring to the ratio design method, the gradient design of the strength and setting time of the structural repairing reinforcing material can be performed to improve the strength and durability of the system of OPC and SAC, and realize the ecological design of cement materials.
The Performance Analysis of Ordinary Portland Cement-Sulfoaluminate Cement Structural Repair Reinforced Materials Compounded with Metakaolin
KSCE J Civ Eng
KSCE Journal of Civil Engineering ; 28 , 7 ; 2872-2884
2024-07-01
13 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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