caa a22 4500 605454612 CHVBK 20210128100208.0 cr unu---uuuuu 210128e20150501xx s 000 0 eng 10.1007/s10064-014-0658-9 doi (NATIONALLICENCE)springer-10.1007/s10064-014-0658-9 Abu Seif El-Sayed Faculty of Earth Sciences, King Abdul-Aziz University, P.O. Box 80206, 21589, Jeddah, Saudi Arabia aut Efficiency of quicklime in reducing the swelling potential of pulverized expansive shale, Northern Jeddah, Saudi Arabia [Elektronische Daten] [El-Sayed Abu Seif] Expansive shale has been found extensively all over the world, especially in tropical and sub-tropical regions. The ground heave that results from shale swelling potential is a multi-factorial phenomenon. Remarkably, the expansive shale of Saudi Arabia varies considerably due to variations in its ancient environmental climatic conditions. The studied shale of Bathan Formation at Al-Rehaili northeastern Jeddah is considered a problematic expansive material and classified as clayey shale of high plasticity (CH). Clay mineral species of these lacustrine sediments are composed mainly of smectite, kaolinite, and smectite-illite mixed layered. Exchangeable sodium percentage values of the Bathan Formation, northern Jeddah are very low. Addition of quicklime (up to 3%) decreases consistency limits. The destructive effect of quicklime addition (up to 3%) on the swelling potentiality of these clayey-rich sediments is due to the formation of highly swell ettringite. Mechanical properties, such as unconfined compression strength, have been improved due to the cementation effect of lime as well as the creation of new crystalline compounds such as calcium silicates and ettringite. Adding quicklime percent should not exceed 3% to prevent increasing pH value and to avoid formation of ettringite which has higher ability to swell. Springer-Verlag Berlin Heidelberg, 2014 Expansive shale nationallicence Swelling potentiality nationallicence Quicklime nationallicence Ettringite nationallicence Jeddah nationallicence Saudi Arabia nationallicence Bulletin of Engineering Geology and the Environment Springer Berlin Heidelberg 74/2(2015-05-01), 637-650 1435-9529 74:2<637 2015 74 10064 https://doi.org/10.1007/s10064-014-0658-9 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/s10064-014-0658-9 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Abu Seif El-Sayed Faculty of Earth Sciences, King Abdul-Aziz University, P.O. Box 80206, 21589, Jeddah, Saudi Arabia aut NATIONALLICENCE 773 0- Bulletin of Engineering Geology and the Environment Springer Berlin Heidelberg 74/2(2015-05-01), 637-650 1435-9529 74:2<637 2015 74 10064