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- Title
Stability of Lightweight Self-Consolidating Concrete Containing Coarse and Fine Expanded Slate Aggregates.
- Authors
Sadek, Mohamed M.; Ismail, Mohamed K.; Hassan, Assem A. A.
- Abstract
This study aimed to optimize the use of fine and coarse expanded slate lightweight aggregates in developing successful semilightweight self-consolidating concrete (SLWSCC) mixtures with densities ranging from 1850 to 2000 kg/m3 (115.5 to 124.9 lb/ft3) and strength of at least 50 MPa (7.25 ksi). All SLWSCC mixtures were developed by replacing either the fine or coarse normalweight aggregates with expanded slate aggregates. Two additional normalweight self-consolidating concrete mixtures were developed for comparison. The results indicated that due to the challenge in achieving acceptable self-consolidation, a minimum binder content of at least 500 kg/m3 (31.2 lb/ft3) and a minimum water-binder ratio (w/b) of 0.4 were required to develop successful SLWSCC with expanded slate. The use of metakaolin and fly ash were also found to be necessary to develop successful mixtures with optimized strength, flowability, and stability. The results also showed that SLWSCC mixtures made with expanded slate fine aggregate required more high-range water-reducing admixture than mixtures made with expanded slate coarse aggregate. However, at a given density, mixtures developed with expanded slate fine aggregate generally exhibited better fresh properties in terms of flowability and passing ability, as well as higher strength compared to mixtures developed with expanded slate coarse aggregate.
- Subjects
LIGHTWEIGHT concrete; SELF-consolidating concrete; FLY ash
- Publication
ACI Materials Journal, 2020, Vol 117, Issue 3, p133
- ISSN
0889-325X
- Publication type
Article
- DOI
10.14359/51722407