The Using of Concrete Wash Water from Ready Mixed Concrete Plants in Cement Systems

Concrete plants accumulate large amounts of concrete wash water. This water, which pH is highly alkaline, has a negative impact on the environment. Its reuse in fresh concrete slightly reduces its mechanical properties. The combination of concrete wash water and zeolitic by-product led to an increas...

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Bibliographic Details
Published in:Materials 2021-05, Vol.14 (10), p.2483
Main Authors: Vaičiukynienė, Danutė, Kantautas, Aras, Tučkutė, Simona, Manhanga, Fallon, Janavičius, Eugenijus, Ivanauskas, Ernestas, Rudžionis, Žymantas, Gaudutis, Aloyzas
Format: Article
Language:English
Subjects:
Byproducts
Catalytic cracking
Cement hydration
Chemical reactions
Compressive strength
Concrete mixing
Drinking water
Hydration
Mechanical properties
Particle size
Petroleum industry
Ready mixed concrete
Reuse
Zeolites
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Summary:Concrete plants accumulate large amounts of concrete wash water. This water, which pH is highly alkaline, has a negative impact on the environment. Its reuse in fresh concrete slightly reduces its mechanical properties. The combination of concrete wash water and zeolitic by-product led to an increase of 4.6% in the compressive strength at 7 days hydration and up to 30% at 28 days hydration. The same combination led to the denser microstructure compared to the samples made with concrete wash water. This could be explained by the pozzolanic reaction of the zeolitic by-product. The complex chemical reactions of cement, zeolitic by-product, and fines presented in the concrete wash water occurred. Therefore, it was suggested the reusing method of concrete wash water together with zeolitic by-product in the fresh concrete mixtures by substituting some amount of tap water with concrete wash water. In this way, the consumption of tap water is possible to reduce in cement systems.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma14102483