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Effect of Nano-TiO2 on physical and mechanical properties of cement at low temperature

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Document pages: 12 pages

Abstract: Low temperature has a negative impact on the engineering performance of cementitious materials and hinders the construction productivity. Previous studies have shown that TiO2 nanoparticles can accelerate cement hydration and enhance the strength development of cement-based materials at room temperature. However, the performance of cementitious materials containing TiO2 nanoparticles at low temperature is still unknown. In this study, samples   weight percent, 2   weight percent, 3   weight percent, 4   weight percent and 5   weight percent TiO2 nanoparticles were prepared by replacing cement with 1.5 cement, and cured for a specific age at temperatures of 0 ° C, 5 ° C, 10 ° C and 20 ° C. Through setting time test, compressive strength test, flexural strength test, Hdration degree test, mercury intrusion porosimetry (MIP), X-ray diffraction (XRD) analysis, thermal gravimetric analysis (TGA), and scanning electron microscopy (SEM) in order to examine the performance of cementitious materials with and without TiO2 nanoparticles at various curing temperatures. It was found that low temperature delayed the process of cement hydration while TiO2 nanoparticles had a positive effect on accelerating the cement hydration and reducing the setting time in terms of the results of the setting time test, hydration degree test, and strength test, and the specimen with the addition of 2 wt. TiO2 nanoparticles showed the superior performance. Refined pore structure in the MIP tests, more mass loss of CH in TGA, intense peak appearance associated with the hydration products in XRD analysis, and denser microstructure in SEM demonstrated that the specimen with 2 wt. TiO2 nanoparticles exhibited preferable physical and mechanical properties compared with that without TiO2 nanoparticles under various curing temperatures.

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