Investigation on the mechanism of self-healing effect of cementitious capillary crystalline waterproofing material on concrete and enhancement of its resistance to chloride erosion

• Published in: Construction & building materials 2024-06, Vol.430, p.136416, Article 136416
• Main Authors: Ren, Dongya, Wang, Zilin, Luo, Wenrui, Yang, Haibo, Wu, Pengfei, Su, Shaonan, Ai, Changfa, Kong, Lin
• Format: Article
• Language: English
• Subjects: Cementitious capillary crystalline waterproofing material; Chloride salt solution; Concrete; Penetron Admix; Pores
• ISSN: 0950-0618; 1879-0526
• DOI: 10.1016/j.conbuildmat.2024.136416

To enhance the compactness of concrete in coastal areas and impede the ingress of chloride solutions into the structures, Cementitious capillary crystalline waterproofing material (CCCW) was internal incorporated into concrete. This study employed one-dimensional chloride immersion diffusion tests and wet-dry cycle tests to emulate the deterioration of concrete under natural conditions due to chloride ions. The optimal dosage of CCCW was determined by conducting chemical titration to measure the chloride ion concentration at various depths within the specimens. Subsequently, the influence of incorporating CCCW on the compressive strength of concrete under chloride conditions was assessed. Finally, employing experimental methods such as MIP, SEM and EDS, the pores within cementitious materials and the formation of internal crystals was examined at a microscopic level. Research indicates that in chloride salt environments, the penetration of salt solutions can trigger the formation of spider silk biomimetic shape crystalline structures within the internal pores of CCCW. thereby enhancing the compactness of concrete to achieve a self-healing effect while preventing the intrusion of chloride salt solutions. [Display omitted] •Utilized a kind of CCCW Material to enhance the compactness of the cementitious matrix.•Microscopic experiments are performed to evaluate crystals from different perspective, providing comprehensive analysis and evaluation.•The effect of adding CCCW materials on the compressive strength and chlorine salt resistance of concrete was studied.