Effect of Sodium Sulfate Solution Coupled with Wetting-Drying Cycles on the Properties of Nano-Alumina-Modified Concrete

被引:0
作者
Gao, Kai [1 ,2 ,3 ,4 ]
Chen, Dun [1 ,2 ,3 ,4 ]
Li, Chunqing [5 ]
Li, Guoyu [1 ,2 ,3 ,4 ]
Mao, Yuncheng [5 ]
Wu, Xuyang [1 ,2 ]
Su, Anshuang [6 ]
Zhang, Hang [7 ]
Wang, Xu [8 ]
机构
[1] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Frozen Soil Engn, Key Lab Cryospher Sci & Frozen Soil Engn, Lanzhou 730000, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[3] Chinese Acad Sci, Int Res Ctr China Mongolia Russia Cold & Arid Reg, Lanzhou 730000, Peoples R China
[4] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Da Xinganling Observat & Res Stn Frozen Ground Eng, Jagdaqi 165000, Peoples R China
[5] Northwest Minzu Univ, Sch Civil Engn, Lanzhou 730030, Peoples R China
[6] Heilongjiang Prov Hydraul Res Inst, Harbin 150080, Peoples R China
[7] State Grid Heilongjiang Elect Power Co Ltd, Elect Power Res Inst, Harbin 150030, Peoples R China
[8] Heilongjiang Transportat Informat & Sci Res Ctr, Harbin 150080, Peoples R China
关键词
concrete; sodium sulfate; strength; microstructure; crystallization pressure; structure damage; POROUS MATERIALS; CRYSTALLIZATION; ATTACK; CEMENT; NANO-SIO2;
D O I
10.3390/nano15020120
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The degradation of concrete caused by sulfate attack poses a significant challenge to its durability. Using nanomaterials to enhance the mechanical and durability properties of concrete is a promising solution. A study of the durability of nano-alumina (NA)-modified concrete by sulfate erosion was carried out. The results showed that the compressive strength, quality, and permeability of concrete to chloride ions decreased during its long-term erosion by a sodium sulfate solution. The NA-modified concrete exhibited higher resistance to erosion by the sodium sulfate than ordinary concrete (OPC), the rate of reduction in its tensile strength was low, and the resistance of sample NA1 to penetration by chloride ions decreased only by one-fifth compared with that of OPC. The results of mercury intrusion porosimetry (MIP) and scanning electron microscopy (SEM) tests showed that erosion had severely damaged the pore characteristics and micromorphology of concrete. The total porosities of the OPC and NA1 samples increased from 12.68% and 10.29% to 16.03% and 12.71%, respectively. Their microscopic morphology revealed loose particles and poor compactness. The leading causes of damage to concrete due to erosion by the sodium sulfate were its crystallization pressure and the swelling-induced stress caused by the deposition of crystals in its pores. This study demonstrates that NA can significantly enhance the durability of concrete against sulfate attack, offering valuable insights for strategic applications of NA in concrete materials.
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页数:18
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