Abstract
In this research, silane coupling agent was used to modify the surface of nano-SiO2, particles and the effects of modified nano-SiO2 particles on the mechanical properties of high-performance cement-based composites and its mechanism were systematically studied. The results indicated that the optimum modification parameters were a coupling agent content of 10%, reaction temperature of 65 °C, and reaction time of 8 h. Compared with the unmodified nano-SiO2, the modified nano-SiO2 promoted and accelerated the hydration process of cement. The pozzolanic effect, filling effect, and nucleation effect of modified nano-SiO2 made the microstructure of the composite more compact, and thus improved static mechanical properties of cement-based composites.
Highlights
With the rapid development of global economy and the continuous advancement of large-scale infrastructure projects, more and more requirements are put forward for the strength, toughness, safety, and durability of concrete building materials
Adding nano-materials into cement-based materials is another way to improve the micro-structure of cement paste and pore structure from the micro-perspective in order to improve the mechanical properties of High-performance concrete (HPC) [6,7,8,9,10]
For differential thermal analysis (DTA) and thermal gravimetric analysis (TGA) (NETZSCH: Selb, Germany, Model:STA449 F3), the specimens were soaked in absolute alcohol for 48 h to stop hydration and milled to particles that could pass the 80 μm sieve
Summary
With the rapid development of global economy and the continuous advancement of large-scale infrastructure projects, more and more requirements are put forward for the strength, toughness, safety, and durability of concrete building materials. Numerous researchers have investigated the effects of nano-SiO2 particles on the performance of cement-based materials. Rong [16] investigated the effect of nano-SiO2 on the hydration process and microstructural constituents of ultra-high-performance cementitious composites. Liu [17] studied the effects of nano-SiO2 on early strength and microstructure of steam-cured high volume fly ash cement system. Nano-materials can modify the microstructures and improve the mechanical properties of ordinary concrete or HPC to a certain extent. A simple and effective surface modification method was used to modify nano-SiO2 to improve the dispersion of nano-SiO2 , especially suitable for large scale production. The effects of modified nano-SiO2 particles on the properties of high-performance cement-based composites and their mechanism were studied
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