Study on Corrosion Resistance of Nano SiO2-CSA-OPCRepair Mortar in Saline Soil

Abstract

Abstract: In order to study the corrosion resistance of nano-SiO₂-sulphoaluminate cement-ordinary Portland cement (NS-CSA-OPC) repair mortar in saline soil,the long-term semi-immersion test in NaCl solution,Na₂SO₄ solution and NaCl-Na₂SO₄ composite solution was used to simulate the saline soil corrosion environment and accelerate the corrosion of NS-CSA-OPC mortar specimens.The change law of NS-CSA-OPC repair mortar on the mass,relative dynamic elastic modulus,compressive corrosion resistance coefficient and chloride ion content under three corrosion environments were tested.The results show that NS-CSA-OPC mortar shows excellent corrosion resistance in the three kinds of corrosion solutions,and the compressive corrosion resistance coefficients of the system are higher than 1.0 after soaking for 270 d;in the long-term semi-immersion test,the corrosion degree of three corrosion solutions to NS-CSA-OPC repair mortar is:Na₂SO₄>NaCl-Na₂SO₄>NaCl;the existence of chloride mitigates the corrosion expansion damage of sulfate.

Key words: nano silica, sulphoaluminate cement, ordinary Portland cement, semi-immersion, saline soil corrosion resistance, compressive strength

CLC Number:

TU525

ZHU Dianzhi, LIU Zuoyu, DONG Changhong, LIU Qingfeng, NIU Mengdie, LI Guoxin. Study on Corrosion Resistance of Nano SiO₂-CSA-OPCRepair Mortar in Saline Soil[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(1): 83-89.

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Study on Corrosion Resistance of Nano SiO₂-CSA-OPCRepair Mortar in Saline Soil

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