Lightweight Combustion Residues-Based Structural Materials for Use in Mines. Quarterly Report, 1 March 1995--31 May 1995 Page: 3 of 22
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Table 1. Preliminary Mix Set Descriptions
Mix Number of Purpose of the mix
trial mixes
H- 6 To determine the effect of using high LOI Fly Ash grout on
M material properties. Percentage of fly ash was varied from 0% to
100%.
I& 2 Two mixes with best results were chosen to evaluate nylon and
K polypropylene fibers.
KK, 3 The best mix was taken and lime content was replaced by two
N different quantities (5% and 10%) of FBC Spent Bed material.
&O
Table 2. Additional Mix Set Descriptions
Set Purpose of the mix
A Study the effect of polypropylene and nylon fibers on compressive strength and
modulus of rupture values
B Effect of two mixing speeds on compressive strength and deformation modulus
D Obtain modulus of rupture for mixes with different densities
F Develop relation between compressive strength and modulus of rupture values.
G Obtain compressive strength for hollow 6 in. X 2.762 in. X 12 in. cylinders.Engineering Properties of Developed CCB-based Materials
ASTM compressive strength equipment and procedures (ASTM C 39 and C873) were
used for the test. Most of the tests were conducted using cylinders 3 in. X 6 in. All
experiments done in the later half of current quarter used high LOI F-type fly ash.
Preliminary mixes covered the total range of fly ash proportions (i.e. 0% to 100%).
About 2.4% lime was added to mobilize early strength of mixes. Mix constituents and six
(6) day test results are included in the report. Water / Powder (cement + fly ash + silica
fume + lime) was kept at 0.172 for all the mixes up to the mix set M. An extra 10%
water and superplasticizer were added in the mixes KK, N and O. Lime and a portion of
fly ash were replaced by FBC Spent Bed material (F) in mixes N and O. Linear
relationships between compressive strength and density and deformation modulus and
density were developed. These were compared with similar relationships developed using
the low LOI fly ash earlier.
The variation in compressive strength for varying fly ash to cement ratios is given in
Figure 1; highest value is obtained around 65% without addition of FBC spent-bed
material. Additional studies are required to define this relationship beyond 0.65 ratio. A
preliminary economic analysis reported in March quarterly report was based on 0.5 ratio.
The above finding should further reduce the cost of fabricating artificial supports since the
cost of cement (a major factor) will be reduced.
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Chugh, Yoginder P.; Zhang, Yuzhuo; Ghosh, Ashok Kumar; Palmer, Stephen R.; Peng, Suping & Xiao, Y. Lightweight Combustion Residues-Based Structural Materials for Use in Mines. Quarterly Report, 1 March 1995--31 May 1995, report, 1995-22~; Carbondale, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc670716/m1/3/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.