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Abstract

The effect of the air-entraining agent on properties of mortar mixtures as well as on the compressive strength of hardened mortars was the objective of this study. Such mortars contain a certain amount of evenly spread closed air-voids pores with dimensions of 0.02-0.05 mm. On the one hand, the presence of a large volume of such air bubbles results in the reduction of mechanical properties of mortar. On the other hand, the use of this technological approach improves rheological properties of mortar mixture. The effect of the air entrainment on the flow, density, volume of entrained air of mortar mixture and compressive strength of hardened mortar was established. Obtained results show substantial increasing in the mortar flow at cement to sand ratio 1:2 by 1.8 times. The further decrease of C:S ratio results in a slight increase of the flow and even negligible its decrease at C:S = 1:4 compared to the reference mortar. The increase of the volume of entrained air results in the decrease of the density and compressive strength of mortar, but improve the resistance to freezing/thawing cycles. The results of this study can be a guide for mortar mix design to choose the most appropriate mix proportion to produce economically efficient mortars.
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Authors and Affiliations

Zinoviy Blikharskyy
1
Taras Markiv
2
Khrystyna Sobol
3
Yurii Turba
3
Jacek Selejdak
4

  1. Faculty of Civil Engineering, Czestochowa University of Technology, 69 St. Dabrowskiego, 42-201 Czestochowa, Poland
  2. Department of Building Production, Institute of Civil Engineering and Building Systems, Lviv Polytechnic National University, S. Bandery Street 12, 79013 Lviv, Ukraine
  3. Department of Highways and Bridges, Institute of Civil Engineering and Building Systems, Lviv Polytechnic National University, S. Bandery Street 12, 79013 Lviv, Ukraine
  4. Faculty of Civil Engineering, Czestochowa University of Technology, 69 St. Dabrowskiego,42-201 Czestochowa, Poland
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Abstract

Incorporation of air-entraining agent has improved recycled concrete freeze-proof durability. However, it is very lacking to study the role of the entraining agent. In this paper, the influence of an air-entraining agent on freeze-proof durability for the ordinary C30 recycled coarse aggregate (RCA) concrete and air-entrained C30 RCA concrete was investigated with the laboratory comparative tests. The mass loss, the dynamic modulus of elasticity, ultrasonic wave velocity and cubic compressive strength were measured during freeze-thaw cycles. The test result showed the concrete’s performance was similar to the ordinary concrete and was better than that of other recycled concretes when the content of RCA was 50% and 0.03% of air-entraining agent was added for C30 RCA concrete. Meanwhile, the addition of air-entraining agent has an improved effect on the performance of recycled concrete, but the effect was limited.
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Authors and Affiliations

Xianghui Deng
1
ORCID: ORCID
Yiyuan Liu
2
ORCID: ORCID
Rui Wang
1
ORCID: ORCID

  1. Prof., School of Civil and Architecture Engineering, Xi’an Technological University, Xi’an, 710021, China
  2. Ms., School of Civil and Architecture Engineering, Xi’an Technological University, Xi’an, 710021, China

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