Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Emulsion


Assessing the Dynamic Behavior of Asphalt Stabilized Gypseous Soil

Mahmood D. Ahmed

Engineering and Technology Journal, 2014, Volume 32, Issue 4, Pages 822-841

The study presents the test results of stabilizing gypseous soil embankment obtained from Al- Faluja University Campus at Al-Ramady province. The laboratory investigation was divided into three phases, the physical and chemical properties; the optimum liquid asphalt (emulsion) requirements (which are manufactured in Iraq) were determined by using one dimensional unconfined compression strength test. In the first phase , the optimum fluid content was 11% (6% of emulsion with 5% water content). At phase two, the effect of aeration technique was investigated using both direct shear and permeability test. At phase three, a laboratory soil model of dimensions 50x50x30 cm was used as a representative of gypseous soil; pure soil, and asphalt stabilized soil have been compacted in five layers after practicing an aeration technique at maximum dry density (modified compaction) cyclic loading test was carried out on four gypseous soil models, two of them were pure soil under (dry and absorbed condition), and the other two were stabilized with emulsion also under (dry and absorbed condition). The impact of charging the hydraulic conductivity due to asphalt stabilization was investigated and the vertical deformations were determined using LVDT.
For the pure soil in dry condition the vertical settlement at the top surface was (7.45 mm) at (157 load cycles), while for pure soil model under absorbed condition, the water was raised to the surface in three days , so the vertical settlement at the top surface was (12.5 mm) at (29 load cycles), this means that the pure gypseous soil under absorbed condition show reduction in strength by(85%).
When the stabilized soil is in dry condition, the vertical settlement at the top surface was (9.75 mm) at (911 load cycles), while the soil was stabilized and subjected to water absorbed for seven days. The water stopped rising at second layer which is the same inlets level from the bottom, and the vertical settlement was (10.47 mm) at (897 load cycles), so there is no change in strength at failure.

To Prepare Special Formula to be Used as Diesel Fuel

Taghreed M. Hameed; Laith Hamzah Thuaban; Seham Mzher; Aqeel Talip Jafar; Wurood Ali Aboud

Engineering and Technology Journal, 2013, Volume 31, Issue 18, Pages 1-10

The basic idea for this research is summarized in preparing special formula consisting of cut hydrocarbon petroleum with pure water and a combination of surface tension materials and the formula prepared in the form of emulsion (diesel-water) which is being stabilized in storage temperature and at temperatures and colliding pressure during use .The prepared emulsion is used in the interior combustion engines to increase the efficiency of fuel and reducing of toxic gases emissions and contaminated particles.
Iraqi diesel fuel product in" Daura Refinery” was selected and the emulsion was prepared by mixing with gradual addition of water to the diesel containing small amounts of (surface- tension) material. In this research variables and optimum conditions of preparation and their impact on stability were studied such as water/diesel ratio, concentration of surfactants, mixing periods and mixing speeds. The physical properties of formula prepared were measured such as density, viscosity and surface tension. The results show that the optimum conditions of preparation were: 5% water/diesel ratio; 0.2% concentration of surfactants; 3 min. mixing period and 4000 rpm mixing speed.

CONTRIBUTION OF LIQUID ASPHALT IN SHEAR STRENGTH AND REBOUND CONSOLIDATION BEHAVIOUR OF GYPSEOUS SOIL

SAAD I. SARSAM; SALAH W. IBRAHIM

Engineering and Technology Journal, 2008, Volume 26, Issue 4, Pages 484-495

Abstract
This paper deals with the effect of stabilizing gypseous soil using two liquid Asphalt
types (cutback and emulsion) on its behavior in shear strength and rebound
consolidation.
Soil-Asphalt specimens had been constructed using various percentages of both liquid
Asphalt types. One group of such specimens were tested in the direct shear box
apparatus to determine the effect of liquid Asphalt on shear strength, cohesion and
angle of internal friction using the unconsolidated un drained test.
Another group of the specimens were subjected to one dimensional confined
compression test using both dry and saturated testing conditions in the consolidation
apparatus.
The effect of liquid Asphalt on the behavior of mixes in consolidation and rebound
consolidation was studied.
It was concluded that gypseous soil is usually stiff in the dry condition, but it is weak
and had a collapsible behavior when saturated. The addition of liquid Asphalt provides
cohesion strength to the soil mass and also acts as a waterproof agent. It creates a type
of elastic properties and reduces the total strain.