Journal
SADHANA-ACADEMY PROCEEDINGS IN ENGINEERING SCIENCES
Volume 45, Issue 1, Pages -Publisher
SPRINGER INDIA
DOI: 10.1007/s12046-020-01347-9
Keywords
Repair; interfacial transition zone; bond behaviour; model; evolution
Categories
Funding
- Science and Technology Program of Henan Province of China [182102210418]
- Key scientific research projects of universities in Henan [19B560004, 20B560010]
- Kaifeng Science and Technology Program of Kaifeng City of China [1901023]
- National Natural Science Foundation of China [51972337]
- Kaifeng university
- science and technology platform of Kaifeng University collaborative innovation center for new energy-saving building materials
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This paper reports the test results on the bonding strength between magnesium ammonium phosphate cement and Portland cement. The bonded specimens were prepared by immersion in Na2SO4 solution. Following immersion, the surfaces and positions of fractures on the specimens were examined. SEM and an optical microscope were used to analyse changes of the interfacial microzone following different immersion periods. Microstructure changes of the magnesium ammonium phosphate cement-based interfacial microzone within the bonded mortar specimens were studied and compared with those immersed in normal conditions. The bonded mortar specimens were found to have weaker bonding strength than that of the mortar specimens in normal conditions. Under normal conditions, slight crystal morphology changes of the interfacial microzone were observed and the crystal structure appeared compact, while more noticeable changes occurred within mortar specimens immersed in Na2SO4 solution, with the crystal structures within them being more loose. The bonding behaviour of the magnesium ammonium phosphate cement includes mechanical bonding, mutual diffusion, and chemical bonding. Structural diagrams of the interfacial transition zone (ITZ) in different environments are also presented. Further investigations are needed to determine the performance of the bonding interface microzone of Portland cements and magnesium ammonium phosphate cements within repair materials in order to enhance the performance of cement-based composite materials for concrete repair.
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