Concrete Bricks Waldorf MD

Coal mines in Waldorf are a hidden market for concrete block, used to build ventilation walls. Concrete block walls direct the flow of air, gases and dust. A typical underground coal mine may use more than 100,000 concrete blocks for these walls, called "ventilation stoppings" or "brattish walls."

The Driggs Corp
(301) 843-5600
12205 Billingsley Rd
Waldorf, MD
 
Charles County Asphalt Co
(301) 843-0600
12455 Billingsley Rd
Waldorf, MD
 
Redland Genstar
(301) 870-6200
12250 Acton Ln
Waldorf, MD
 
R J Sealcoating Dull
(301) 645-1100
9020 Fairground Rd
Waldorf, MD
 
Ed Stewarts Asphalt
(301) 645-7694
4849 Bryantown Rd
Waldorf, MD
 
Beltway Paving
(301) 870-5115
11745 Pika Dr
Waldorf, MD
 
Tri-County Paving Inc
(301) 705-5551
1106 Princeton Ln
Waldorf, MD
 
Jerome Kyler
(301) 705-7473
2874 Scenic Meadow St
Waldorf, MD
 
Waldorf Asphalt
(301) 870-6200
12250 Acton Ln
Waldorf, MD
 
A Plus Paving And Concrete
(301) 274-2565
5545 Woodridge Drive
Waldorf, MD
 

Concrete Bricks

Provided By:

Source: MASONRY CONSTRUCTION MAGAZINE
Publication date: May 1, 2008

By Carolyn Schierhorn

Abstract:

Coal mines are a hidden market for concrete block, used to build ventilation walls. Concrete block walls direct the flow of air, gases and dust. A typical underground coal mine may use more than 100,000 concrete blocks for these walls, called "ventilation stoppings" or "brattish walls." Block is also the preferred material for mine seals, which close off abandoned areas. The natural fire resistance of concrete masonry makes it ideal for use in mines, where fire poses an even greater hazard than it does above ground. The high strength and durability of block appeal to mining engineers, who must consider roof cave-ins and explosions in their calculations.

Ventilation Stoppings
The mine workers have to get as much air to the working face as possible and remove methane and coal dust from the area. To do this, mine workers build ventilation stoppings. By preventing unwanted flow in these passages, the walls direct the flow of intake air to the working face and return air, gases, and dust to the outside.

Seals
1.After they've finished mining a section of the mine, workers have to seal that section off with concrete block. The Mine Safety and Health Administration (MSHA) requires that each seal be:

Constructed of solid concrete blocks of at least 6x8x16 inches, laid with mortar between the joints.

2.Hitched (recessed) into the solid sides of the opening to a depth of at least 4 inches and hitched at least 4 inches into the floor

3.At least 16 inches thick.


Concrete masonry remains the material of choice in ventilation stoppings and seals, as well as a popular material for roof supports.

Click here to read full article from Masonry Construction