Analysis methodology of XCT results for testing ingress of substances in hardened cement paste: Explained with chloride immersion test

摘要: Abstract X-ray computed tomography (XCT) can non-destructively detect microstructure of cement-based material. However, its raw results involve errors induced by the equipment and external factors. Once studying changes taken place in a sample, such as durability related studies, which need testing on same sample at intervals, these will result misleading conclusions. At moment, literature, no method focusing effectively reasonably eliminating or minimising has not been observed. After analysing ten series XCT for samples experiencing various types exposures, authors established rational data-processing to minimise influence test results, is introduced this paper. To assist readers’ understanding, relevant information are illustrated with case immersion hardened cement pastes NaCl solution. Obtained prove that diffusion substances paste be properly revealed data processing introduced; trend depth change caused exposure determined; solution led gradual decrease density further hydration particles, should leaching Calcium from into solution; once immersed solution, 0.35 w/c was slower than 0.5 had an approximate linear relationship square root duration.