Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Structural Uses and Placement Techniques for Lightweight Concrete in Underground Mining
The U.S. Bureau of Mines conducted experiments on the use of lightweight concrete in the density range of 100 lb/cu ft for liners in underground mines. Three test sections were completed: a monolithic, portal-type structure with integral walls and arch constructed above ground; an underground test section constructed in a mine drift using plywood forms; and a second section constructed in a drift using an air-supported formwork. The lightweight concrete in the two underground test sections was placed using piston pumps and slickline. Fiber reinforcement was added to the concrete in the mine sections without any apparent problems with either pumping or placement of the concrete. In another experiment, lightweight concrete in the density range of 25 lb/cu ft was used to replace timber blocking in a raise preparation structure. Other experiments are described in which low-density, lightweight concrete blocks were produced for mine ventilation doors, stoppings, and barricades. Other mine uses reviewed include pillars and collapsing beams. An advantage of low-density concrete is that it will display up to 50% deformation at a constant yield stress.
Structural Uses and Placement Techniques for Lightweight Concrete in Underground Mining
The U.S. Bureau of Mines conducted experiments on the use of lightweight concrete in the density range of 100 lb/cu ft for liners in underground mines. Three test sections were completed: a monolithic, portal-type structure with integral walls and arch constructed above ground; an underground test section constructed in a mine drift using plywood forms; and a second section constructed in a drift using an air-supported formwork. The lightweight concrete in the two underground test sections was placed using piston pumps and slickline. Fiber reinforcement was added to the concrete in the mine sections without any apparent problems with either pumping or placement of the concrete. In another experiment, lightweight concrete in the density range of 25 lb/cu ft was used to replace timber blocking in a raise preparation structure. Other experiments are described in which low-density, lightweight concrete blocks were produced for mine ventilation doors, stoppings, and barricades. Other mine uses reviewed include pillars and collapsing beams. An advantage of low-density concrete is that it will display up to 50% deformation at a constant yield stress.
Structural Uses and Placement Techniques for Lightweight Concrete in Underground Mining
E. H. Skinner (Autor:in)
1989
40 pages
Report
Keine Angabe
Englisch
Placement and use of concrete underground
| Engineering Index Backfile | 1960
Lightweight structural concrete
Engineering Index Backfile | 1961
Structural lightweight concrete
| Engineering Index Backfile | 1964
Concrete and reinforced concrete in underground mining
| Engineering Index Backfile | 1925