氯化銨加速侵蝕下混凝土性能劣化及微觀機理影響研究

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DOI：10.19860/j.cnki.issn1005- 8249.2024.05.003

LI Wei1，SUN Haiyan1，ZHAO Yang2，WANG Ran'，WENG Yalian （1. College of Water Conservancy，Yunnan Agricultural University，Kunming 65O2O1，China；2. Research Center of Fluid Machinery Engineering and Technology， Jiangsu University， Zhenjiang 212O13，China）

Abstract：Inordertostudythedeteriorationofconcreteperformanceundertheactionofammoniumchlorideerosion，the concrete wasimmersedin6mol/LNH4Clsolution，andthemechanical propertiesanderosiondepthof theconcrete were measured.Thechanges ofpore structure were characterized bycalculating the water contentandsaturationof thespecimens undertheerosionage，andtheinternalphasechangesandmorphologicalcharacteristicsof thespecimens werecharacterizedand analyzedbyscanning electron microscopy.Theresultsshow thatintheenvironmentof ammoniumchloride erosion，with he increaseof erosiontime，theerosiondepthofconcreteincreasesgradually，andtheporosityincreases significantly.Compared withthe standardcuringenvironment，thecompresivestrengthofconcreteattheinitial stageof erosion increases，whilethe compressive strength of concrete at 60～90 days of erosion decreases. The water content of concrete increases significantly under theerosionenvironment，whilethesaturationofthespecimenisopposite.TheerosionoftringiteandFriedel'ssaltgenerated insidetheconcrete byammoniumchloride is themainreason forthedevelopmentofcracks inthelater stageofconcrete.

Keywords：ammonium chloride；accelerated erosion；mechanical properties；pore structure；microstructure

0 引言

過去幾十年，混凝土作為良好的建筑材料被廣泛應用于水工建（構）筑物中，也是惡劣環(huán)境中首選的材料[1]。（剩余7698字）