Volume 36, N. 2, May-August 2013 | PDF(2 downloads)
The article presents a study on the influence of exposure conditions on strength and absorption in soil stabilized
with lime and rice husk ash. A soil classified as A-4 and CL, known as Red-Yellow Podzol, a hydrated lime and a
crystal-type burnt rice husk ashes were used throughout the study. The laboratory testing program encompassed
compaction of specimens of soil and its mixtures with lime content of 8% enriched with ash contents of 5% and 10% of the
soil dry weight in the Normal Proctor Energy. The specimens were moist-cured for 28 days and then subjected to different
exposure conditions, including curing in kiln oven, fully exposed and immersed in water. After curing the specimens were
subjected to compressive strength tests with and without previous 24 h immersion in water, and also to absorption tests.
Results showed the advantages of using ash as an auxiliary additive in soil-lime mixtures to promote mechanical strength
increase and its long-term maintenance, as well as reducing the influence of saturation on compressive strength. Water
immersion promoted the best mechanical strength increase, and water absorption increased with the increasing percentage
of ash and with the curing time of the mixtures.