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dc.contributor.authorWang, J.
dc.contributor.authorWang, X.
dc.contributor.authorDing, S.
dc.contributor.authorAshour, Ashraf
dc.contributor.authorYu, F.
dc.contributor.authorXinjun, L.
dc.contributor.authorHan, B.
dc.date.accessioned2023-03-16T11:34:03Z
dc.date.accessioned2023-03-24T08:50:27Z
dc.date.available2023-03-16T11:34:03Z
dc.date.available2023-03-24T08:50:27Z
dc.date.issued2023-08
dc.identifier.citationWang J, Wang X, Ding S et al (2023) Micro-nano scale pore structure and fractal dimension of ultra-high performance cementitious composites modified with nanofillers. Cement and Concrete Composites. 141: 105129.en_US
dc.identifier.urihttp://hdl.handle.net/10454/19369
dc.descriptionYesen_US
dc.description.abstractThe development of ultra-high performance cementitious composite (UHPCC) represents a significant advancement in the field of concrete science and technology, but insufficient hydration and high autogenous shrinkage relatively increase the pores inside UHPCC, in turn, affecting the macro-performance of UHPCC. This paper, initially, optimized the pore structure of UHPCC using different types and dimensions of nanofillers. Subsequently, the pore structure characteristics of nano-modified UHPCC were investigated by the mercury intrusion porosimeter method and fractal theory. Finally, the fluid permeability of nano-modified UHPCC was estimated by applying the Katz-Thompson equation. Experimental results showed that all incorporated nanofillers can refine the pore structure of UHPCC, but nanofillers with different types and dimensions have various effects on the pore structure of UHPCC. Specifically, CNTs, especially the thin-short one, can significantly reduce the porosity of UHPCC, whereas nanoparticles, especially nano-SiO2, are more conducive to refine the pore size. Among all nanofillers, nano-SiO2 has the most obvious effect on pore structure, reducing the porosity, specific pore volume and most probable pore radius of UHPCC by 31.9%, 35.1% and 40.9%, respectively. Additionally, the pore size distribution of nano-modified UHPCC ranges from 10-1nm to 105nm, and the gel pores and fine capillary pores in the range of 3-50nm account for more than 70% of the total pore content, confirming nanofillers incorporation can effectively weaken pore connectivity and induce pore distribution to concentrate at nanoscale. Fractal results indicated the provision of nanofillers reduces the structural heterogeneity of gel pores and fine capillary pores, and induces homogenization and densification of UHPCC matrix, in turn, decreasing the UHPCC fluid permeability by 15.7%-79.2%.en_US
dc.language.isoenen_US
dc.rights(c) 2023 Elsevier. Reproduced in accordance with the publisher's self-archiving policy. This manuscript version is made available under the CC-BY-NC-ND 4.0 license (https://creativecommons.org/licenses/by-nc-nd/4.0/)en_US
dc.subjectUltra-high performance cementitious compositesen_US
dc.subjectNanofiller modifyingen_US
dc.subjectPore structureen_US
dc.subjectFluid permeabilityen_US
dc.subjectFractal theoryen_US
dc.titleMicro-nano scale pore structure and fractal dimension of ultra-high performance cementitious composites modified with nanofillersen_US
dc.status.refereedYesen_US
dc.contributor.sponsorNational Science Foundation of China (51978127, 52178188 and 51908103), the China Postdoctoral Science Foundation (2022M720648 and 2022M710973) and the Fundamental Research Funds for the Central Universities (DUT21RC(3)039).
dc.date.application2023-05-11
dc.typeArticleen_US
dc.type.versionAccepted manuscripten_US
dc.identifier.doihttps://doi.org/10.1016/j.cemconcomp.2023.105129
dc.rights.licenseCC-BY-NC-NDen_US
dc.date.updated2023-03-16T11:34:06Z
refterms.dateFOA2023-03-24T08:50:46Z
dc.openaccess.statusopenAccessen_US


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