Abstract: A mine safety dust exhibiting improved dispersion in water. The rock dust includes dolomitic limestone particles which, when mixed at the mine site to form a slurry, stay in suspension during intermittent operation of spray machinery and with a reduced need for continuous mixing. The rock dust composition includes an inorganic salt that acts as a dispersant to improve dispersion of the rock dust in water and further acts as a deflocculant to keep the dust particles in suspension in the resultant slurry.

Abstract: A mine safety dust exhibiting improved dispersion in water. The rock dust includes dolomitic limestone particles which, when mixed at the mine site to form a slurry, stay in suspension during intermittent operation of spray machinery and with a reduced need for continuous mixing. The rock dust composition includes an inorganic salt that acts as a dispersant to improve dispersion of the rock dust in water and further acts as a deflocculant to keep the dust particles in suspension in the resultant slurry.

Abstract: A wall construction system including plurality of interlocking concrete blocks. The interlocking blocks include one or more stretcher blocks, corner blocks, and half blocks. The blocks include top and end shear lugs and bottom and end grooves. The bottom grooves accommodate the top shear lugs of blocks in a lower course of stacked blocks. Corner blocks provide a means for creating a corner and turning the direction of a course of blocks by 90 degrees. The interlocking features of the blocks enable dry-stacking in successive courses to construct a wall or multi-wall structure. When stacked end to end in successive rows, the top and end shear lugs of each interlocking block engage complimentary grooves in the underlying, overlying, and adjacent blocks thereby enabling the blocks to rapidly self-align vertically and lock together as they are stacked. The resulting dry-stacked structure exhibits a high lateral resistance to overpressures or transverse loads.

Abstract: A wall construction system including plurality of interlocking concrete blocks. The interlocking blocks include one or more stretcher blocks, corner blocks, and half blocks. The blocks include top and end shear lugs and bottom and end grooves. The bottom grooves accommodate the top shear lugs of blocks in a lower course of stacked blocks. Corner blocks provide a means for creating a corner and turning the direction of a course of blocks by 90 degrees. The interlocking features of the blocks enable dry-stacking in successive courses to construct a wall or multi-wall structure. When stacked end to end in successive rows, the top and end shear lugs of each interlocking block engage complimentary grooves in the underlying, overlying, and adjacent blocks thereby enabling the blocks to rapidly self-align vertically and lock together as they are stacked. The resulting dry-stacked structure exhibits a high lateral resistance to overpressures or transverse loads.

Abstract: A mine seal or wall capable of retaining its integrity under a transverse load. The mine seal is constructed of a plurality of interlocking masonry blocks. The interlocking blocks include a body with a top surface, planar sides, planar ends, and a bottom surface. A top shear lug extends longitudinally along the top of the block. An end shear lug extends vertically along each end of the block. The bottom surface and each end of the block includes a groove therein. When stacked end to end in successive rows, the top and end shear lugs of each interlocking block engage the complimentary grooves in the adjacent blocks thereby enabling the blocks to self-align vertically and lock together as they are stacked. The resulting mine seal exhibits a high resistance to transverse loads.

Abstract: A mine seal or wall capable of retaining its integrity under a transverse load. The mine seal is constructed of a plurality of interlocking masonry blocks. The interlocking blocks include a body with a top surface, planar sides, planar ends, and a bottom surface. A top shear lug extends longitudinally along the top of the block. An end shear lug extends vertically along each end of the block. The bottom surface and each end of the block includes a groove therein. When stacked end to end in successive rows, the top and end shear lugs of each interlocking block engage the complimentary grooves in the adjacent blocks thereby enabling the blocks to self-align vertically and lock together as they are stacked. The resulting mine seal exhibits a high resistance to transverse loads.