Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
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 micron BS sieve. Effects of dust content in aggregate on properties of fresh and hardened concrete are not known very well. An experimental study was undertaken to find out the effects of various proportions of dust content on properties of fresh concrete, and hardened concrete. The following conclusions can be derived: 1. Slump decreased as the percentage of dust content increased. 2. Air content of fresh concrete decreased as the percentage of dust content increased. 3. Increasing the dust content up to 10 % improved compressive strength of concrete. For higher dust contents than 10 %, the compressive strength decreased gradually. 4. Increasing the dust content up to 10 % improved the flexural strength of concrete. However, the dust content exceeding 10 %, decreased the flexural strength of concrete gradually. 5. 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. 6. The minimum value for absorption was obtained when the dust content is 15 %. Dust contents higher than 15 % increased the absorption of concrete. 7. 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. 8. Increasing the dust content up to 10 % increased the drying shrinkage. As the dust content exceeded the value of 10 %, 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.
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 micron BS sieve. Effects of dust content in aggregate on properties of fresh and hardened concrete are not known very well. An experimental study was undertaken to find out the effects of various proportions of dust content on properties of fresh concrete, and hardened concrete. The following conclusions can be derived: 1. Slump decreased as the percentage of dust content increased. 2. Air content of fresh concrete decreased as the percentage of dust content increased. 3. Increasing the dust content up to 10 % improved compressive strength of concrete. For higher dust contents than 10 %, the compressive strength decreased gradually. 4. Increasing the dust content up to 10 % improved the flexural strength of concrete. However, the dust content exceeding 10 %, decreased the flexural strength of concrete gradually. 5. 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. 6. The minimum value for absorption was obtained when the dust content is 15 %. Dust contents higher than 15 % increased the absorption of concrete. 7. 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. 8. Increasing the dust content up to 10 % increased the drying shrinkage. As the dust content exceeded the value of 10 %, 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.
Effects of crushed stone dust on some properties of concrete
Einfluß von Brecherstaub auf einige Eigenschaften von Beton
Cement and Concrete Research ; 26 ; 1121-1130
1996
10 Seiten, 5 Bilder, 2 Tabellen, 19 Quellen
Aufsatz (Zeitschrift)
Englisch
Effects of Crushed Stone Dust on Some Properties of Concrete
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