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These processes produce inherently layered cementitious components that are anisotropic, and in many cases, produces a weak interface between layers, which are generally referred to as cold joints. While material strength at these interfaces has been well studied in recent years, durability has received less attention, even though cold joints can function as channels for aggressive agents, such as chlorides. This work presents a method using micro-X-ray fluorescence (<jats:italic>\u03bc<\/jats:italic>XRF) to image chloride ingress into layer interfaces of 3D printed fine-grained concrete specimens produced with varying layer deposition time intervals, and also compares it to neutron imaging of moisture uptake. The results show that cold joints formed after a 1\u00a0day time interval are highly susceptible to chloride ingress, and that curing conditions play a major role in how quickly interfacial transport can take place. The <jats:italic>\u03bc<\/jats:italic>XRF method is also shown to be useful for study of transport of chlorides in cold joints, due to its spatial resolution and direct analysis of an aggressive species of interest.<\/jats:p>","DOI":"10.1617\/s11527-023-02132-w","type":"journal-article","created":{"date-parts":[[2023,3,6]],"date-time":"2023-03-06T09:05:05Z","timestamp":1678093505000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":24,"title":["Using micro-XRF to characterize chloride ingress through cold joints in 3D printed concrete"],"prefix":"10.1617","volume":"56","author":[{"given":"Paula","family":"Bran-Anleu","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2839-6433","authenticated-orcid":false,"given":"Timothy","family":"Wangler","sequence":"additional","affiliation":[]},{"given":"Venkatesh N.","family":"Nerella","sequence":"additional","affiliation":[]},{"given":"Viktor","family":"Mechtcherine","sequence":"additional","affiliation":[]},{"given":"Pavel","family":"Trtik","sequence":"additional","affiliation":[]},{"given":"Robert J.","family":"Flatt","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2023,3,6]]},"reference":[{"key":"2132_CR1","unstructured":"The third industrial revolution\u2014Manufacturing, (n.d.). https:\/\/www.economist.com\/leaders\/2012\/04\/21\/the-third-industrial-revolution. 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