The Effect of Adding Resistance Supplementary Materials to Gypsum Soils for Lining Water Conveyance Channels

Document Type : Research Paper


1 PhD Student, Department of Water Engineering, Faculty of Agriculture, Ferdowsi University of Mashhad (International campus).

2 Associate Professor, Department of Water Engineering, Faculty of Agriculture, Ferdowsi University of Mashhad).

3 Associate Professor, Department of Water Engineering, Faculty of Agriculture, Ferdowsi University of Mashhad.


Using some additive materials to gypsum soil can increase its compressive strength and erosion and make it fit for civil  projects in irrigation networks. In this study, (Journal No. 268., 2003) five levels of cement (5, 8, 10, 12 and 15 % to dry soil) and three levels of micro silica (0, 5 and 10 % cement) were added to the local soil. The processing of soil samples were conducted in two temperature (27 and 400C) and their compressive strength was studied and analyzed via SAS statistical software. In the present research, the best combination, with the minimum addition and a high compressive strength, was reached by adding 10% cement and 10% micro silica to the soil.  In order to evaluate the sample’s erosion potential, it was exposed to water jet plane in four angles (Ө = 0,30,60, 90), five speeds (V = 2, 4, 6, 8 and 8.64 m/s) and three times (T =4,8 and 12 hr) and the highest weight loss erosion (dw) was observed between the speed of 4 to 8 m/s and the time of 8 hours later in a horizontal state (0 Ө =). .


Main Subjects

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Volume 41, Issue 1
May 2018
Pages 181-194
  • Receive Date: 11 May 2016
  • Revise Date: 08 November 2016
  • Accept Date: 10 December 2016
  • Publish Date: 21 April 2018