Related Experiment Video
Updated: Jun 3, 2025
05:36
Production and Analysis of Sporosarcina pasteurii Biocement Bricks Using Custom 3D-Printed Molds for Unconfined Compression Tests
Published on: March 7, 2025
193
Sustainable Alkali-Activated Self-Compacting Concrete for Precast Textile-Reinforced Concrete:
Vitalii Kryzhanovskyi1, Jeanette Orlowsky1
1Faculty of Architecture and Civil Engineering, TU Dortmund University, 44227 Dortmund, Germany.
Materials (Basel, Switzerland)
|January 8, 2025
Summary
This study demonstrates how industrial wastes like brick powder and recycled sand can create sustainable, high-strength self-compacting concrete. This innovation supports the circular economy and reduces environmental impact in construction.
Area of Science:
- Materials Science
- Civil Engineering
- Environmental Science
Background:
- Industrial and construction wastes constitute a significant portion of global waste.
- Utilizing these wastes in concrete production offers an environmentally sound solution.
Purpose of the Study:
- To investigate the combined effects of brick powder, recycled sand, and alkaline activators on self-compacting concrete properties.
- To optimize concrete mixtures for textile-reinforced concrete production using waste materials.
Main Methods:
- Experimental-statistical modeling was employed to analyze fresh and hardened concrete properties.
- Modified passing ability tests with textile mesh approximated real-world conditions.
- Compression, flexural, and splitting tensile strength tests were conducted at various ages.
Main Results:
- Mathematical models were developed to optimize concrete compositions.
- Partial replacement of slag cement with brick powder (up to 30%) and natural sand with recycled sand (up to 100%) was feasible.
- Alkali-activated, high-strength self-compacting concrete incorporating waste materials was successfully produced.
Conclusions:
- The developed concrete formulations significantly reduce environmental impact.
- This approach promotes a circular economy within the construction industry.
- Sustainable, high-performance concrete can be achieved using recycled industrial byproducts.
Related Concept Videos
01:26Alkali Aggregate Reaction in Concrete
87
The alkali-aggregate reaction in concrete involves natural siliceous minerals in aggregates reacting with alkaline hydroxides derived from cement alkalis. This reaction forms an alkali-silica gel that absorbs water, swells, and increases in volume, which is confined by the surrounding cement paste, creating internal pressures that crack and disrupt the concrete. The extent of expansion and damage can be partly attributed to the alkali-silica reaction's osmotic hydraulic pressure and the...
87
01:23Abrasion Resistance of Concrete
103
Abrasion resistance is an essential characteristic of concrete that determines its durability and longevity under various wear conditions. Concrete surfaces are vulnerable to different types of abrasion. For instance, surfaces may wear down due to the constant movement of vehicles or be eroded by solids carried in water, as seen in concrete canal linings. Specific tests are conducted to measure the abrasion resistance of concrete.
One such test is the revolving disc test, where three plates...
One such test is the revolving disc test, where three plates...
103
01:14Testing Water Quality
103
When the quality of water for concrete preparation is uncertain, its impact on the setting time of cement and compressive strength of mortar is assessed by comparison with de-ionized or distilled water benchmarks. American Society for Testing and Materials (ASTM) C1602 requires the setting times to be within 90 minutes of the control, British Standard (BS) 3146:1980 allows a 30-minute variance in the initial setting, while British Standards European Norm (BS EN) 1008 specifies initial setting...
103
01:14Design Example: Managing Concrete Workability
71
This example deals with managing the workability of concrete for a raft foundation project under hot weather conditions. Workability is crucial for ensuring the concrete is easy to place, compact, and finish. In this scenario, a slump test — a common method to measure the workability of fresh concrete — initially indicated low workability. This was attributed to the rapid water loss from the concrete mix, exacerbated by the high temperatures causing the course aggregates to heat up.
71
01:28Effects of Air-entrainment in Concrete
79
Air entrainment in concrete significantly enhances the material's durability, especially in environments subjected to freeze-thaw cycles. Introducing small air bubbles into the concrete mix acts as internal voids that accommodate the expansion of water when it freezes, thereby alleviating internal stress and preventing structural cracks. This function is crucial in climates with significant freezing and thawing, as it protects the concrete from repeated stresses that could lead to premature...
79
01:27Shrinkage in Concrete
78
Shrinkage in concrete is primarily due to water loss from evaporation, hydration of cement, or carbonation, leading to a reduction in volume. The volumetric contraction results in volumetric strain in concrete. However, in practice, shrinkage is measured as linear strain, which is one-third of the volumetric strain.
When concrete is still in its plastic state, it can undergo a decrease in volume by about 1% of its absolute volume. This decrease is known as plastic shrinkage. It arises either...
When concrete is still in its plastic state, it can undergo a decrease in volume by about 1% of its absolute volume. This decrease is known as plastic shrinkage. It arises either...
78