Crusher dust is a fine material formed during the process of comminution of rock into crushed stone or crushed sand. This dust is composed by particles which pass 75 urn sieve. Effects of dust content in aggregate on properties of fresh and hardened concrete are not known very weil. An experimental study was undertaken to find out the effects of various proportions of dust content on properties of fresh concrete, and hardened concrete.
Crusher Dust's Role
Crushed rock dust acts as a filler and helps to reduce the total voids content in concrete. Consequently, this contributes to improve the quality of concrete. In this research, some part of the sand replaced by crushed rock dust at amounts of up to 30 percent keeping all the other ingredients and proportions constant. The effects of varying dust contents on the physical and mechanical properties of fresh and hardened concrete were investigated. Slump and air content of fresh concrete and absorption, compressive strength, flexural strength, impact resistance, water permeability and drying shrinkage of hardened concrete were also investigated.
- Slump decreased as the percentage of dust content increased.
- Air content of fresh concrete decreased as the percentage of dust content increased.
- Increasing the dust content up to 10% improved compressive strength of concrete. For higher dust contents than lo%, the compressive strength decreased gradually.
- Increasing the dust content up to 10% improved the flexural strength of concrete. However, the dust content exceeding lo%, decreased the flexural strength of concrete gradually.
- Concrete made of up to 5% dust content improved the impact resistance of concrete. However, dust contents more than 5% reduced the impact resistance of concrete significantly.
- The minimum value for absorption was obtained when the dust content is 15%. Dust contents higher than 15% increased the absorption of concrete.
- Water permeability of concrete decreased as the dust content percentage increased. The reason for this is that, the more dust content added to the concrete, the more water passages and channels were blocked, hence this leads to a reduction in the permeability of concrete.
- Increasing the dust content up to 10% increased the drying shrinkage. As the dust content exceeded the value of lo%, the drying shrinkage strain decreased. This has a relationship with compressive strength, the higher the strength of concrete, the higher the drying shrinkage exhibited and maintained.
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