Geotechnical Behavior of Stabilized Dunes Sand by Cement

Abstract

The dunes sand is wide spread with huge quantities all over the world especially in desert areas near roads. The objective of the current paper is to use dunes sand as a foundation soil under structures instead of utilizing expensive replacement with structural fills. The dunes sand samples were collected from a site outside Tabuk city in the north-west of Saudi Arabia. Several experimental tests were performed on the dunes sand samples such as sieve analysis, standard Proctor compaction, drained direct shear and CBR. The test results indicated that the sand dunes are SP according to USCS. The sand dunes have also low shear strength and CBR value. The bearing ability of the sand dunes became weaker due to water immersion. Therefore, the construction on the non-treated dunes sand is impossible. For the later reason, the dunes sand was stabilized with various ordinary Portland cement fractions ranging from 3% to 15%. Compaction and CBR tests were conducted on the stabilized dunes sand. The maximum dry density increased as the increments of the cement contents accompanying with the decrement of porosity and optimum moisture content. The stabilized dunes sand implied higher CBR values than the non-treated soil. The CBR values of the stabilized soil increased with increasing cement fractions. The stabilized dunes sand induced very high CBR values after longer curing times for all the utilized cement contents. The stabilized dunes sand using only 3% is considered the optimum design achieving good performance under structures and best economic mix.

Evaluating the Effect of Cement and ARG Fiber on the Mechanical and Microstructural Properties of Dune Sand

“…The work outcomes indicated that the bearing capacity of the stabilized sand increases by increasing the cement content, and it is independent of the compaction energy. Elsawy [5] investigated the behavior of dune sand stabilized with different percentages of cement. The results showed that the maximum dry density increases with the increase in cement content leading to a reduction in porosity and optimum moisture content.…”

“…Many investigations have indicated that, in the absence of stabilizer in Aeolian sand, Aeolian sand exhibited CBR value of almost 4%. However, incorporating 10% cement and 15% geopolymer resulted in CBR values of 133% and 112%, respectively [5].…”