Study on the Variation of the Compressive Strength and Quality Change of Concrete Added Nano-SiO2/CuO under Sulfate Attack
In order to explore the strength and quality changes of concrete doped with nanomaterials under sulfate erosion,salt erosion tests were carried out with two kinds of nanomaterials(i.e.,Nano-CuO and Nano-SiO2)sulfate solution with mass percentage concentraitions of 1.0%,5.0%and 10.0%respectively.The results show that with the erosion time increased,the surface of concrete specimens gradually peeled off.The compressive strength first increased and then decreased.Adding a certain amount of Nano materials into concrete can effectively improve the compressive strength,but as the amount of Nano materials increased,the Nano materials will agglomerate and reduce the activity,resulting a decrease in the compressive strength of the concrete.Additionally,the sulfate concentration also affected the compressive strength of concrete.When the sulfate concentration is 10%,adding 0.1%Nano-CuO or 0.1%Nano-SiO2 can improve the sulfate resistance of concrete.Compared with Nano-CuO,Nano-SiO2 is better for improving the sulfate resistance of concrete.
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