The effective method to use the ash of thermal power plants in construction

Authors

  • N. V. Savitskiy Dr. Sc. (Tech.), Prof., Ukraine
  • I. A. Sokolov Dr. Sc. (Tech.), Prof., Ukraine
  • N. A. Storozhuk Dr. Sc. (Tech.), Prof., Ukraine
  • A. R. Abbasova Postgrad. Stud., Ukraine

Keywords:

ash, ash-concrete, vibrocompaction, vibrovakuumizing, strength, shrinkage, swelling

Abstract

Summary. Purpose. The developing of the scientific and technological base of vibrovacuumized ash concretes on the basis of the stale ash. It will improve the reliability of the technology and the technical and economic efficiency of these concrete products, contribute to the intensification of technological processes at the enterprises of the construction industry, to high strength and durability of ash concretes. Methods. New technology of preparation of ash concrete mix was applied, that is as follows. To prepare ash slurry (water-ash ratio of 0.5) in the rotary mixer. Then, cement and optionally additional water is metered into the prepared slurry and make ash concrete mix with required plasticity. During the molding of products from such mix by vibrovacuumizing the excess tempering water is removed. It results in a well compacted ash concrete with high strength at age of 28 days. Results. For the first time high efficiency of vibrovacuumizing of ash concrete mixes is proved. It is established that vacuum ash concrete hardens much faster in initial terms than vibrocompacted ash concrete made from mobile or stiff mix. At the age of 28 days strength of vacuum ash concrete is in 2 times higher than strength of vibrated ash concrete made from mobile mixes. Vibrovacuumizing significantly reduces shrinkage and swelling in 1.5 ... 2 times. Scientific novelty. Ash concrete mix, which is compacted by vacuumizing (vibrovacuumizing), has an optimal composition for mobility, which provide the best compaction and, accordingly, the greatest strength of vacuum ash concrete  at a given cement consumption. Practical significance. Application of scientific results contributes to the mass use of fly ash of thermal power plants in construction, obtaining products from vacuum ash concrete with low cost, high physical and mechanical properties. Conclusion. For the first time high efficiency of vibrovacuumizing of ash concrete mixes is proved. It is established that vacuum ash concrete hardens much faster in initial terms than vibrocompacted ash concrete made from mobile or stiff mix. In the first 1...3 days strength of vacuum ash concrete is in 3...4 times more than vibrocompacted. At the age of 28 days strength of vacuum ash concrete is in 2 times higher than strength of vibrated ash concrete made from mobile mixes. Vibrovacuumizing makes it possible to reduce shrinkage and swelling in 1.5...2 times. It indicates greater durability of vacuum ash concrete compared to vibrocompacted.

Author Biographies

N. V. Savitskiy, Dr. Sc. (Tech.), Prof.

Department of Reinforce-Concrete and Stone Constructions, State Higher Education Establishment "Pridneprovsk State Academy of Civil Engineering and Architecture", 24-A, Chernyshevskogo str, Dnepropetrovsk 49600, Ukraine

I. A. Sokolov, Dr. Sc. (Tech.), Prof.

Department of Construction Production Technology, State Higher Education Establishment "Pridneprovskaya State Academy of Civil Engineering and Architecture", 24-A, Chernishevskogo str., Dnipropetrovsk 49600, Ukraine

N. A. Storozhuk, Dr. Sc. (Tech.), Prof.

Department of Technology of Building Materials, Products and Сonstructions, State Higher Education Establishment "Pridneprovsk State Academy of Civil Engineering and Architecture", 24-A, Chernyshevskogo str, Dnepropetrovsk 49600, Ukraine

A. R. Abbasova, Postgrad. Stud.

Department of Reinforce-Concrete and Stone Constructions, State Higher Education Establishment "Pridneprovsk State Academy of Civil Engineering and Architecture", 24-A, Chernyshevskogo str, Dnepropetrovsk 49600, Ukraine

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Published

2016-07-05

Issue

Section

Innovative lifecycle technology of housing and civil, industrial and transportation purposes