Discussion. Pulverized Fuel Ash as Embankment Material.

Abstract

a grading analysis somewhat coarser than that shown in Fig. 6. The high content of cellular material led to erratic moisture/density results and very low dry densities in the laboratory.53. The dry density varied between 54 and 60 lbjcu. ft over a range of water content of about 35%, with no clearly defined optimum value, In one way, a material having this characteristic was no bad thing since it could be easily Compacted over a wide range of moisture content and weather conditions. A good sub-base of stronger and less variable material would be required, however, between the formation and the road construction.54. Another interesting point was the breakdown of the coarse lagoon ash under dynamic compaction in the laboratory, the d20 size decreasing from 0.2 mm to 0.095 mm with the uniformity coefficient (d60/d20) increasing from 3.5 to 5.0. 55. It was largely because of the poor compaction results combined with the low increase of strength with time that it was decided to provide bank seats of cementstabilized ash rolled in situ. Crushing tests on 3-in. diameter cylinders of cementstabilized coarse lagoon ash compacted with standard Proctor energy at 33% moisture content and cured in a saturated atmosphere gave the results listed in Table 10.

Lagoon PFA: Feasibility for use as a binder in concrete

“…The results indicate that this process is 20 progressive with storage period, as noted 10 elsewhere [19][20][21][22]. However, it is likely that the excess of water present influences , 0 the development of bonding structures, 6 and, due to dispersion effects, this appears to be less widely developed than for conditioned PFA stored at lower moisture contents [9].…”

Economic assessment of use of pond ash in pavements

“…Typically, fly ash has been used for soil stabilization in road pavements -Chu et al (1995); as embankment material - Raymond (1961); as structural fill -DiGioia and Nuzzo (1972);…”