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Domagała L, Podolska A. Effect of Lightweight Aggregate Impregnation on Selected Concrete Properties. Materials (Basel). 2021;15(1)doi: 10.3390/ma15010198.
Domagała, L., & Podolska, A. (2021). Effect of Lightweight Aggregate Impregnation on Selected Concrete Properties. Materials (Basel, Switzerland), 15(1), . https://doi.org/10.3390/ma15010198
Domagała, Lucyna, and Podolska, Agnieszka. "Effect of Lightweight Aggregate Impregnation on Selected Concrete Properties." Materials (Basel, Switzerland) vol. 15,1 (2021). doi: https://doi.org/10.3390/ma15010198
Domagała L, Podolska A. Effect of Lightweight Aggregate Impregnation on Selected Concrete Properties. Materials (Basel). 2021 Dec 28;15(1). doi: 10.3390/ma15010198. PMID: 35009351; PMCID: PMC8746000.
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Materials (Basel). 2021 Dec 28;15(1). doi: 10.3390/ma15010198.

Effect of Lightweight Aggregate Impregnation on Selected Concrete Properties.

Materials (Basel, Switzerland)

Lucyna Domagała, Agnieszka Podolska

Affiliations

  1. Faculty of Civil Engineering, Cracow University of Technology, 31-155 Cracow, Poland.

PMID: 35009351 PMCID: PMC8746000 DOI: 10.3390/ma15010198

Abstract

The impregnation of lightweight aggregate (LWA) is an alternative method to its pre-moistening, which is used to limit the loss of fresh concrete workability due to the aggregate's ability to absorb a great amount of mixing water. The aim of this study was to access the effectiveness, by pre-coating LWAs with cement paste, in modifying the properties of concrete composites. Two types of lightweight aggregates (Lytag and Leca) characterized with a relatively open-structure shell were selected. The other changeable parameters taken into consideration in this research were: LWA size, initial moisture of aggregate before the impregnation process and type of cement paste applied as an impregnant. Sixteen concretes prepared with pre-moistened and pre-coated lightweight aggregates were subject to a density test in different moisture conditions, a water absorption test and a compressive strength test. On the one hand, the pre-coating of LWAs with cement paste resulted in a relatively slight increase in concrete density (by up to 19%) compared to the pre-moistening of LWAs. On the other hand, it caused a very significant reduction (by up to 52%) in the composite's water absorption and an incomparably greater growth (by up to 107%) in compressive strength. The most crucial factors determining the effectiveness of impregnation of LWAs with cement pastes in improvement of composite properties were the aggregate type and its size. The composition of impregnating slurry and the initial moisture content of LWA before pre-coating also mattered.

Keywords: aggregate impregnation; compressive strength; concrete drying; expanded clay; lightweight aggregate; lightweight concrete; moisture content; sintered fly ash; water absorption

References

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