چكيده به لاتين
The unsuitableproperties of soft soils require the improvement of these types of soils.Stabilization with traditional materials such as cement and lime as one of the soil improvement methods has destructive environmental effects due to the release of large amounts of carbon dioxide, significant energy consumption, and accelerating the depletion of natural resources.On the other hand, the slags left in various industries, especially in the metal industries, due to their high volume, if left in the nature, cause a lot of environmental pollution, and its sanitary disposal is very expensive.These disadvantages have encouraged engineers to replace traditional soil stabilization materials with more environmentally friendly materials such as geopolymers, which simultaneously reduce the environmental impact of traditional materials production and slag disposal, however, the main problem in the use of copolymers is the lack of studies in this field.
Considering the stated environmental issues, in this study, as the main goal, the possibility of using geopolymer based on silico manganese slag using sodium hydroxide solution to improve clay soils has been investigated.In addition to the main goal, the secondary objectives were to evaluate the effect of different percentages of silico manganese slag, weight ratios of activator to binder (slag) and curing conditions (temperature and time) on thecompressive strength of clay samples.In the present study, the unconfined compressive strength test and SEM imaging were performed in order to quantitatively and qualitatively evaluate the stabilization of the samples.
The research results showed that the stabilization of clay soil with geopolymer made of silicomanganese slag was successful and it is possible to achieve high resistance parameters.For example, the unconfined compressive strength of clay stabilized with 10% by weight of slag, the weight ratio of sodium hydroxide solution to silico manganese slag equal to 1.2 with 7 days of curing at room temperature was 5.67 MPa.On the other hand, the results showed that in all the samples, the unconfined compressive strength has a direct relationship with the amount of slag, the weight ratio of the activator to the binder, the curing time and temperature.Also, the results showed that the strain at the failure for all samples is less than 1.5%.
