Details:

Personal Author:
Hay, K. E. (Kenneth E.) ; Johnston, Joanne L.
Hay, K. E. (Kenneth E.) ; Johnston, Joanne L. Less -
Corporate Authors:
United States. Bureau of Mines.
Description:
"The Bureau of Mines collected coal and coal waste aggregate material from two different mine sites to determine their strength characteristics for use in concrete. The concrete would be placed underground as support walls for ground control in adverse conditions or unique mining applications. A standard mix design was established for a "wet" mix using a water-to-cement (w/c) ratio of 1.0 To facilitate pumping into place. Later, material was collected from four more mine sites and used to make 2- by 2- by 2-ft test blocks with the same w/c ratio. A pullout cone device and borehole shear tester were used to determine the in situ material strength of the test blocks. These techniques will provide a simple and quick way of determining support wall strength in an underground environment. Test results from the pullout cone device showed a good correlation of 0.98 To test cylinder compressive strengths of the same mix. Results of the borehole shear tester were inconclusive." - NIOSHTIC-2

NIOSH no. 10005370


Subject:
[+]
Aggregates (Building Materials) -- Testing.
Coal -- Testing.
Concrete Mine Supports.

Series:
Report of investigations (United States. Bureau of Mines) ; 9038
Document Type:
Report
Collection(s):
National Institute for Occupational Safety and Health
Main Document Checksum:
[+]
urn:sha256:9bbb6cf7c40397bdfb7dee1813b0b7fb94894a62506126452d54e8ceb3b121c1
File Type:

Supporting Files

• No Additional Files

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