The addition of 10% of sugar cane bagasse ash in combination
with 10% of lime significantly improves the mechanical and
durability properties of compacted soil blocks.
The addition of SCBA improved the flexural, compressive
strength and compressive strength of water saturated compacted
blocks prepared with only soil + lime.
Observations of the XRD diagrams for the SCBA + lime mixture
confirm the formation of chemical stable compounds. The compounds
are mainly CSH and CAH, resulting from the reaction
between lime and SCBA, as well as between lime and soil.
No significant strength increase over time was observed for all
the mixtures, which can be influenced presumably by the low
content of fine particles in the soil and the high carbon content
of the SCBA.
Unreacted SCBA
Fig. 14. Micrograph for the CALBA mixture at 28 days of age.
Table 9