Loading...
Please wait, while we are loading the content...
Similar Documents
Durability of Structural Lightweight Concrete with Sintered Fly Ash Aggregate
| Content Provider | MDPI |
|---|---|
| Author | Lucyna, Domagała |
| Copyright Year | 2020 |
| Description | The aim of this study was to present the problem of durability of structural lightweight concrete made of a sintered fly ash aggregate. The issue of durability was researched for 12 concrete series in terms of their water absorption, water permeability, and freeze-thaw resistance. Additionally, the microstructure of several concretes was analyzed with a scanning electron microscope (SEM). In the durability research, the influences of the following parameters were taken into consideration: The initial moisture content of sintered fly ash (mc = 0, 17–18, and 24–25%); the aggregate grading (4/8 and 6/12 mm); and the water-cement ratio (w/c = 0.55 and 0.37). As a result of various compositions, the concretes revealed different properties. The density ranged from 1470 to 1920 kg/m3, and the corresponding strength ranged from 25.0 to 83.5 MPa. The durability research results of tested lightweight concretes showed that, despite considerably higher water absorption, a comparable water permeability and comparable or better freeze-thaw resistance in relation to normal-weight concrete may be present. Nevertheless, the fundamental requirement of lightweight concrete to achieve good durability requires the aggregate’s initial moisture content to be limited and a sufficiently tight cement matrix to be selected. The volume share of the cement matrix and aggregate, the cement content, and even the concrete strength are of secondary importance. |
| Starting Page | 4565 |
| e-ISSN | 19961944 |
| DOI | 10.3390/ma13204565 |
| Journal | Materials |
| Issue Number | 20 |
| Volume Number | 13 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2020-10-14 |
| Access Restriction | Open |
| Subject Keyword | Materials Characterization and Testing of Materials Durability Lightweight Concrete Lightweight Aggregate Sintered Fly Ash Moisture Content Compressive Strength Water Absorption Water Permeability Freeze-thaw Resistance Microstructure |
| Content Type | Text |
| Resource Type | Article |
