caa a22 4500 605454744 CHVBK 20210128100208.0 cr unu---uuuuu 210128e20150501xx s 000 0 eng 10.1007/s10064-014-0653-1 doi (NATIONALLICENCE)springer-10.1007/s10064-014-0653-1 Shear strengths and volume changes of sand-attapulgite clay mixtures [Elektronische Daten] [Tamer Elkady, Abdullah Shaker, Abdulmuhsin Dhowain] Compacted sand-expansive clay mixture with low hydraulic conductivity and appropriate shear strength is employed as liner systems for waste containment systems to prevent groundwater contamination by leachate from the waste. The aim of this study was to assess the shear strength behavior and swelling potentials of sand-attapulgite clay mixtures. The attapulgite clay used in this study was obtained from the eastern province of Saudi Arabia and was characterized as highly expansive. A detailed experimental program was devised to evaluate the effects of clay content (ranging between 0 and 60%), initial molding conditions (optimum and wet-of-optimum), normal stress, and wetting conditions (as-compacted and inundated) on shear strength behavior. Also, the effects of clay content and initial molding conditions on the swelling potential of the mixture were evaluated. Test results revealed different trends for the shear stress-strain curves, signifying that different structural arrangements resulted from the use of different clay contents and molding conditions. Furthermore, test results identified an optimum clay content of 30% which yielded the maximum shear strength; beyond this, a significant reduction in the shear strength of the sand-attapulgite clay mixture was observed. Finally, the shear strengths of sand-attapulgite clay mixtures were compared to those of sand-bentonite mixtures. Springer-Verlag Berlin Heidelberg, 2014 Attapulgite nationallicence Expansive clay nationallicence Bentonite nationallicence Shear strength nationallicence Swelling nationallicence Elkady Tamer Department of Civil Engineering, College of Engineering, King Saud University, P.O. 800, 11421, Riyadh, Kingdom of Saudi Arabia aut Shaker Abdullah Department of Civil Engineering, College of Engineering, King Saud University, P.O. 800, 11421, Riyadh, Kingdom of Saudi Arabia aut Dhowain Abdulmuhsin Department of Civil Engineering, College of Engineering, King Saud University, P.O. 800, 11421, Riyadh, Kingdom of Saudi Arabia aut Bulletin of Engineering Geology and the Environment Springer Berlin Heidelberg 74/2(2015-05-01), 595-609 1435-9529 74:2<595 2015 74 10064 https://doi.org/10.1007/s10064-014-0653-1 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10064-014-0653-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Elkady Tamer Department of Civil Engineering, College of Engineering, King Saud University, P.O. 800, 11421, Riyadh, Kingdom of Saudi Arabia aut NATIONALLICENCE 700 1- Shaker Abdullah Department of Civil Engineering, College of Engineering, King Saud University, P.O. 800, 11421, Riyadh, Kingdom of Saudi Arabia aut NATIONALLICENCE 700 1- Dhowain Abdulmuhsin Department of Civil Engineering, College of Engineering, King Saud University, P.O. 800, 11421, Riyadh, Kingdom of Saudi Arabia aut NATIONALLICENCE 773 0- Bulletin of Engineering Geology and the Environment Springer Berlin Heidelberg 74/2(2015-05-01), 595-609 1435-9529 74:2<595 2015 74 10064