TY  - JOUR
T1  - Using Bypass Addition to Improve Expansive Soil Strength
AU - Al- Hassnawi, Noor AU - Jasim, Rasha AU - Qasim, Mohammed 
JO  - Journal of Engineering and Applied Sciences
VL  - 13
IS  - 22
SP  - 9739
EP  - 9743
PY  - 2018
DA  - 2001/08/19
SN  - 1816-949x
DO  - jeasci.2018.9739.9743
UR  - https://makhillpublications.co/view-article.php?doi=jeasci.2018.9739.9743
KW  - Expansive soil
KW  -improving soil
KW  -additives
KW  -waste of cement industry
KW  -by-pass
KW  -strength
AB  - Expansive soil cover most areas in the middle of Iraq and create major problems for the construction
of buldings. The low bearing capacity and high compressibility of the expansive soil, preclude the support of
structures on them. This study presents laboratory test for expansive soil mixing with additives, identified as
by-paass which is usually brought from cement industry which is called (by-pass) to improve the expansive
soil properties for possible use as a foundation bearing soil. An experminatal research including liquid limit,
plastic limit, plasticity index, specific gravity and soil classification was carried out to determine the physical
properties of clayey soil samples without additives. The research also included conducting unconfined
compression test on soil samples without additives and samples contained several ratios of by-pass (6, 12, 18
and 24%) while keeping the misture content at 20%. Moreover, the chemical compostitions of the baypass
material were obtaited through a chemical laboratory experiment. The result have shown that with the increase
of the by-pass ratio the soil became more ductile and unconfined compression strength increases whereas the
strain decrease. The undrained shear strength increased from 0.25 kg/cm2 for a soil without additives
to 1.6 kg/cm2 for a soil contained 24% by-pass. The ingrediants of the by-pass were found to be as same as for
those of ordinary cement.
ER  -