PSI - Issue 23

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Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000 – 000 Structural Integrity Procedia 00 (2019) 000 – 000

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Procedia Structural Integrity 23 (2019) 77–82

© 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the ICMSMF organizers © 201 9 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the IC MSMF organizers. The test r sults show d that as the content of the uperplasticizer in reases, along with the liquefaction of the concrete mix, the pore content decreases nd their structure chang s. Co sequently, compres ive strength in hardened air entrai ed and non air entraine concr te i creases fr m 1-14%. The ai entrain d of concrete mixes alone results in a loss of stre gth in the range of 5 17% and is d pendent on the content of the superplasticizer, the consistency of the concrete mix, changes in the pore content, and their structure. © 201 9 The Authors. Published by Elsevier B.V. This is an ope access article under the CC BY-NC-ND license (http://creativecommon org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the IC MSMF organizers. The commonly used air entraining of concrete mixes to ensure the freeze-resistance of concrete results in a compressive strength reduction. The literature states that the average drop in compressive strength is 5.5% per 1% present in the air mix, however the role of the superplasticizer and its effect on the properties of the concrete mix and the structure play an important role in shaping the drop in strength due to air entraining concrete. Therefore, the aim of the paper is to analyze the impact of the simultaneous action of a superplasticizer and air entraining admixture on compressive strength. The analysis were based on the results of eight series of air-entrained and non-air-entrained concretes with a fixed basic composition and the content of air entraining admixture in air entrained concrete, liquefied with a superplasticizer to consistency classes S1, S2, S3 and S4. The test results showed that as the content of the superplasticizer increases, along with the liquefaction of the concrete mix, the pore content decreases and their structure changes. Consequently, compressive strength in hardened air entrained and non air entrained concrete increases from 1-14%. The air entrained of concrete mixes alone results in a loss of strength in the range of 5 17% and is dependent on the content of the superplasticizer, the consistency of the concrete mix, changes in the pore content, and their structure. The ommonly used air entraining of conc ete mixes to ensur the freeze-resistance of concrete results in a compressive str ngth eduction. The litera ure states that th averag d in compressive strength is 5.5% pe 1% present in the air mix, however the role of the sup rplasticizer and its effect on the properties f the concrete mix and the structure play an important role in shaping the drop in str ngth due to air entraining concrete. Th refore, the aim of the paper is to analyze the impact of the simultaneous action of a up plasticizer and air entraining admixture on compressive strength. The analysis were bas d on the results of eight series of air-entrained and non-air-entrained concretes with a fixed basic composition and the content of air entraining admixture in air entrained concrete, liquefied with a superplasticizer to consistency classes S1, S2, S3 and S4. 9th International Conference on Materials Structure and Micromechanics of Fracture Impact analysis of air-entraining and superplasticizing admixtures on concrete compressive strength Aneta Nowak-Michta a * a Chair of Building Materials Engineering, Cracow University of Technology, Warszawska 24, Cracow 31-155, Poland 9th International Conference on Materials Structure and Micromechanics of Fracture Impact analysis of air-entraining and superplasticizing admixtures on concrete compressive strength Aneta Nowak-Michta a * a Chair of Building Materials Engineering, Cracow University of Technology, Warszawska 24, Cracow 31-155, Poland Abstract Abstract

Keywords: Compressive Strength, Concrete, Superplasticizer; Air Entraining Admixture; Consistency Keywords: Compressive Strength, Concrete, Superplasticizer; Air Entraining Admixture; Consistency

* Corresponding author. Tel.: +48 12 628-23-63. E-mail address: a_nowak@pk.edu.pl * Correspon ing auth r. Tel.: +48 12 628-23-63. E-mail address: a_nowak@pk.edu.pl

2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the IC MSMF organizers. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an ope acces article under CC BY-NC-ND lic nse (http://creativecommon org/licenses/by-nc-nd/4.0/)

Peer-review under responsibility of the scientific committee of the IC MSMF organizers.

2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the ICMSMF organizers 10.1016/j.prostr.2020.01.066