Deterioration Process of Cementitious Material Properties under Internal Sulphate Attack
نویسندگان
چکیده
As one of the important factors affecting structural durability cementitious materials, sulphate erosion not only reduces service life material but also poses a threat to safety project. At present, scholars around world have conducted extensive research on topics related external attacks and achieved fruitful results. However, process mechanism attack degradation gelling are clear. In this paper, gypsum sand was introduced into mortar. The effects content, particle size curing temperature physical properties such as expansion strength specimens were investigated. X-ray diffraction (XRD), thermogravimetry (TG), differential scanning calorimetry (DSC), Scanning Electron Microscopy (SEM) energy dispersive spectrometry (EDS) used analyse specimens’ phase composition microstructure evolution at different ages. Finally, materials’ under internal (ISA) analysed. Through above research, following main conclusions drawn: (1) swelling rate cement mortar all increased with increase dosing; (2) pastes mortars does in temperature; (3) sizes smaller, is larger, loss compressive bending large; (4) reaction product ISA Ettringite (AFt). formed during cause expansion, while AFt reason for destruction material.
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ژورنال
عنوان ژورنال: Applied sciences
سال: 2023
ISSN: ['2076-3417']
DOI: https://doi.org/10.3390/app13063982