مسعود محسني نيا

Traditional materials such as cement and lime have been widely used to improve all types of soil for many years. For various reasons such as environmental concerns caused by the increase of greenhouse gases, global warming caused by the cement industry and etc, researchers and engineers turned their attentions to environmentally friendly low-carbon alternative materials. Persian gum is a planted-based polysaccharide gum, which is exported in hundreds of tons every year. Due to the presence of many carboxyl and hydroxyl groups, in this research aim was to eva‎luate the effect of adding Persian gum to the well-known laboratory soil of Firuzkoh sand (No. 161). For this purpose, several tests like uniaxial compression, direct and indirect tension, constant head permeability, consolidated drained monotonic triaxial and scanning microscopic imaging analysis were conducted in this research. Persian gum amount and moisture content, the effect of increasing density, curing temperature (oven or room), curing time (7 to 56 days), dry and wet mixing method have been investigated. Addition of gum solution in optimal dosages increases the uniaxial compressive strength and tensile strength of treated samples up to 4.5 MPa and 400 kPa, respectively. Also, by examining the microscopic images and the results of the drained triaxial tests, was found that the bonds created between the soil grains increase adhesion (up to 50 kPa in wet conditions) and decrease the internal friction angle of the untreated soil by about 3 degrees.

بهسازي خاك ماسه اي , ماسه فيروزكوه , صمغ فارسي , آزمايش مقاومت فشاري تك محوري , آزمايش سه محوري تحكيم يافته زهكشي شده , آزمايش كشش مستقيم , آزمايش كشش غير مستقيم

sandy soil improvement , Firouzkooh sand , persian gum , UCS test , CD triaxial test , Direct tensile strength test , Indirect tensile strength test

Masoud Mohseninia

Dr.Hossein Salehzadeh