Effect of Adding Mixture of (Concrete Waste and Asphalt Waste) on the Properties of Gypseous Soil

Abstract

Gypseous soil which is used is taken from Tikrit city in Salah Aldeen government and specially from Tikrit University from a depth (1.5-2)m, It’s type is sandy gravely with a small percentage of silt and clay while the percentage of gypsum is (34-36)%, The tests on soil is standard proctor compaction, direct shear, collapsibility and California bearing ratio. The number of samples is (70). The effect of adding concrete waste (2, 4, 6 and 8%) and waste of Asphalt mixture (2, 4, 6 and 8) % on dry soil, as well as the effect of mixture of the optimum percentages of both additions on the properties of gypseous soil, is the aim of the study. Adding concrete waste at optimum percentage (6)% causes an increase maximum dry density at (16)% and a decrease in optimum moisture content at (5)%. Whereas adding concrete mixture waste in its optimum percentage (2)% caused a decrease in maximum dry density values with an increase of optimum moisture content, and when adding mixture of optimum percentage of waste, an increase happened in the M.D.D.(14)% with a decrease in O.M.C. at (4)%. Adding the optimum percentage (8) % for both. Value of cohesion increases (100)% when adding concrete waste with an increase in the angle of internal friction (14)% and a decrease in collapsibility in a percentage of (90)%, while adding waste of asphalt mixture shows an increase in cohesion value (112)% with a decrease in the angle of internal friction (2)%and a decrease in collapsibility in a percentage of (90)%, when adding mixture of optimum percentages the value of cohesion increase (108)% with an increase in angle of internal friction (14)%and a decrease in collapsibility in a percentage of (91)%. Values of California Bearing Ratio in dry and soaked condition increases (49)% when adding (8)% of concrete wastes which is the optimum percentage, while adding waste of asphalt mixture causes a decrease in the value of C.B.R. and the optimum percentage is (2)% , but adding optimum percentages mixture of them causes an increase in values of (52)% in dry condition and (53)% in soaked condition.

Experimental Investigation of Square Footing Resting on Sand over Gypseous Soils

“…al. [10] used the mixture of (concrete waste and asphalt waste) as addition to the gypseous soil, they found that, the values of cohesion and angle of internal friction increase with the increase of concrete wastes, in which the cohesion increases in a magnitude of 100% and angle of internal friction in a magnitude of 14%, the value 8% represents the optimum percentages. When asphalt mixture wastes are added, the cohesion increases in a magnitude of 112% with a decrease in the angle of internal friction in a magnitude of 2% and the optimum percentage is 108% with an increase in the angle of internal friction in a magnitude of 14%.…”

Deterministic Extensional Viscosity and Cracking Index of Polypropylene-Modified-Asphalt Binder

“…Thus, physical traits evaluation of asphalt is primary. On the other hand, polymers/asphalt mixes within expand domain of contents and kinds perform good implementation in the design of flexible concrete pavements [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] Polyethylene (PE) and polypropylene (PP) are worldwide used polymers in paving applications. Thus, PP was used in this research due to its lower price and added content.…”

Preliminary Study on the Reduction in Shear Strength Parameters of Gypseous Soil upon Wetting

“…Gypsum mineral also known in its chemical formula CaSO 4 .2H 2 O is hydrated calcium sulfate with moderate solubility [3].Several researchers tackled the improvement for gypseous. Some methods involve mixing additives such as cement [4,5], lime [6], and concrete/asphalt waste mixture [7]. However, breaking the gypseous bonds leads to reduction in soil strength.…”

“…Several researchers tackled the improvement for gypseous. Some methods involve mixing additives such as cement [4,5], lime [6], and concrete/asphalt waste mixture [7]. However, breaking the gypseous bonds leads to reduction in soil strength.…”