Study on self-healing properties of waterproof mortar by composite permeable crystalline materials
AN Xuehui
ZHU Chao
YAO Guoyou
Abstract：In order to study waterproof mortar with self-healing properties,based on high-impermeability waterproof mortar,this paper mixed with a composite penetrant crystal material,studied the influence of silica ash on the impermeability of waterproof mortar through impermeability pressure test,and studied the influence of different proportions of penetrant crystal material on the self-healing properties of waterproof mortar through compressive strength recovery rate and relative permeability coefficient.The crystal state of waterproofing mortar cracks was observed by scanning electron microscope.The results show that the permeability resistance of mortar can be significantly improved by replacing part of cement with silica fume.When the replacement amount of silica fume reaches 20％,the seepage height of mortar at 7 days decreases by 61.0％compared with the blank group at 1.5 MPa pressure.The seepage height of 28 d was 58.3％lower than that of blank group.The self-healing performance of the permeable crystalline material with the ratio of Ca(OH)2∶MgSiF6∶EDTA=2.0∶3.0∶1.5 is the best,and the relative water permeability coefficient is reduced by 31.0％and the compressive strength recovery rate is increased by 15.3 percent point compared with the blank group at 5％.Compared with the blank group,the cracks of the waterproofing mortar specimens with composite permeable crystalline materi-als will produce smaller volume and denser crystal structure,bulk or flocculent crystals.
Keywords：infiltration crystallizationimpermeabilityself-healingmicromorphology
Publication Date：2024-12-25
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 1-4,12 )