| 摘要(英) |
The main purpose of
this study is to study the influence of soil gradation and slag cement
content on the engineering properties of soil cement. The soil was taken
from Wu-xi river bank, the sample of soil passed the sieve number 200 of
10% and uniformity coefficients of 2, 10, 20 and 30. The soil was mixed
with various slag cement contents to make soil cement specimens. To
study the durability, strength and permeability properties of soil
cement, laboratory tests, including the wetting and drying test,
unconfined compression test, Brazilian tensile test, and high pressure
permeability test for soil cement, were performed. The results of the
study show that the well-graded soil cements have the highest dry
densities and the lowest optimum water contents. The higher uniformity
coefficient of soil cement is, the less optimum water content is. As the
mixed cement content increased, the durability of soil cement increased
during the wetting and drying test. The compression or tension strength
of soil cement is dependent on curing time and the mixed cement content.
The 28-day compression strength of the soil cement is 1.68 times larger
then the 7-day compression strength, and 1.3 times for the tension
strength. The relation between the strength and time is approximately
linear from the results of this study. Modulus of elastic, unifined
compression strength, and tension strength of the well-graded soil
cement are higher than those for poor-graded soils. Soil cement is a
near impermeable material from the results of high pressure permeability
tests, and the permeability coefficient decreased as the mixed cement
content of soil cement increased. |
