چكيده به لاتين
one of the common and low-cost methods to improve the geotechnical characteristics of sandy
soils is stabilization by additives such as lime and cement. Also, one of the ways to reinforce
the soil and strengthen its mechanical and dynamic properties is the use of natural and synthetic
fibers (recycled-non-recycled) which in the recycled state can help the environment and be
economical. Also, strengthen the desired soil in terms of resistance. This research, investigates
the effect of cement, lime, charcoal ash and straw ash additives, and reinforcing materials
(recycled fibers) on the resistance properties of sandy soil. It should be noted that the materials
used are economical and also important from an environmental point of view compared to
materials such as fly ash. In this research, Firouzkoh 161 sand was used as the base soil, and
by adding a combination of additives and reinforcing materials with different percentages, the
cylindrical samples were made and processed at optimum wet, and then perform the uniaxial
compressive strength test on them and the stress-strain graphs were drowned and different
parameters were analyzed and compared and the effect of increasing additives and fibers on
uniaxial compressive strength and failure strain was investigated. According to the results, the
lime and cement stabilizing materials in the amount of 10% by weight of the sample increased
the uniaxial compressive strength by 9% and 88%, respectively. The presence of reinforcing
materials (fibers) in the soil causes the connection between the distant soil particles together
and in the failure of the samples, the fibers are tense and tolerate more resistance, and as a
result, it increases the plasticity of the sample. It becomes significant. Also, the presence of
straw and charcoal ash increases the compressive strength and plasticity of the sample, which
is due to the chemical reactions between these materials, which lead to the separation of lime
from the ash and the creation of adhesive cement and pozzolanic gels. In the same condition,
charcoal ash was a greater effect in increasing compressive and strain resistance than straw ash.
