| Issue |
MATEC Web Conf.
Volume 116, 2017
6th International Scientific Conference “Reliability and Durability of Railway Transport Engineering Structures and Buildings” (Transbud-2017)
|
|
|---|---|---|
| Article Number | 01016 | |
| Number of page(s) | 7 | |
| Section | Construction Materials, Protection and Repair of Structures and Buildings | |
| DOI | https://doi.org/10.1051/matecconf/201711601016 | |
| Published online | 10 July 2017 | |
Fracture properties of high-strength concrete obtained by direct modification of structure
1 Lviv Polytechnic National University, Department of Highways and Bridges, Bandery st. 12 S., 79013 Lviv, Ukraine
2 Lviv Polytechnic National University, Department of Building Production, Bandery st. 12 S., 79013 Lviv, Ukraine
* Corresponding author: oleksii.m.guniak@lpnu.ua
High-strength concrete is effectively used worldwide in the last three decades, but it is more brittle in comparison with normal strength concretes. Partial substitution of cement in concrete by active mineral additives and usage of chemical admixture of plasticizing and air-entraining action can considerably change their fracture properties. The obtained results show that the increase of the fracture properties is observed in concretes modified with chemical admixtures incorporating mineral additives such as zeolite and limestone due to consolidation of the concrete microstructure. Densification takes place as a result of limiting the amount of calcium hydroxide (CH) due to its reaction with active silica included in the zeolite and the formation of larger amounts of hydrated calcium silicates of tobermorite type as well as calcium hydroaluminate and hydrocarboaluminate with the simultaneous adsorption modification of hydrated products by chemical admixtures.
© The Authors, published by EDP Sciences, 2017
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