文章基本信息

标题：Effects of elevated temperatures on the properties of nanomodified rapid hardening concretes
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作者：Uliana Marushchak ; Uliana Marushchak ; Myroslav Sanytsky 等
期刊名称：MATEC Web of Conferences
电子版ISSN：2261-236X
出版年度：2017
卷号：116
页码：1-5
DOI：10.1051/matecconf/201711601008
语种：English
出版社：EDP Sciences
摘要：Effects of elevated temperature exposure and hardening age on mechanical properties of nanomodified concrete are presented. The mass loss, compressive strength and shrinkage of the exposed to the elevated temperatures and cooled specimens were determined. Nanomodification by ultrafine mineral additives and polycarboxylate eter superplasticizer provides direct early structure formation, higher strength at early and later ages, and improved thermal resistance in a range of 200-350 °C of cement-base materials. High specific surface area of ultrafine mineral additive particles and their “excess surface energy” determine interaction degree with powder part components of concrete and allow realizing dense packing, filler, high water-reducing, early pozzolanic reaction, high early strength effects to increasing the rigidity of the cement matrix to resist deformation at impact of elevated temperature.