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Funct. Mater. 2019; 26 (4): 795-801.

doi:https://doi.org/10.15407/fm26.04.795

Study on mechanical properties of modified concrete based on nano state silica

A.Yang1,3, H.Wu2

1Ulanqab Vocational College, Inner Mongolia Autonomous Region, China
2China Mobile Communication Group Inner Mongolia Co. LTD Ulanqab Branch, Inner Mongolia Autonomous Region, China
3Tianjin Kingfa Advanced Materials Co., O., Ltd. Tianjin, Chi, China

Abstract: 

As a new type of material, nanomaterials are used to study the internal structure and mechanical properties of concrete doped with nanomaterials. In this paper, three factors including a water-binder ratio, silica fume content and slag content are taken into consideration. L9 (34) orthogonal design is adopted to determine the benchmark mix ratio of Reactive Powder Concrete (RPC). By studying the strength values after 7 and 28 days, it was found that when the nano-SiO2 content was from 0.5 % to ~ 1 %, the flexural strength, compressive strength and splitting tensile strength of the RPC could be significantly improved. At the same time, using the scanning electron microscope, it was found that nano-SiO2 made the hydration reaction of the cement matrix more complete, improved the interface structure, and reduced the structural defects of the slurry.

Keywords: 
nano-silica, modified concrete, mechanical properties.
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