Effects of Mellowing Practice on the Strength and Swelling Properties of Road Construction Materials: Case of Sulphate-Bearing Clay Soils Stabilised with Lime-Silica Fume Blended Binder

Qusai Al-Waked, John Kinuthia, Blessing Adeleke, Jonathan Oti, Ahmed Khalifa

Research output: Contribution to journalArticlepeer-review

17 Downloads (Pure)

Abstract

The main thrust of this research was to establish any benefits of mellowing, and the optimal moisture content (OMC) for compacting mellowed sulphate-bearing clay soil undergoing the stabilization process. Two three-day mellowing regimes were carried out, prior to final compaction, at different initial moisture contents of 30% or 40% OMC. The unmellowed specimens were compacted immediately after mixing with the blended stabilizers. A blend of quicklime (L) with a sustainable by-product, silica fume (SF), at a 1:1 ratio (2%L–2%SF) was used. Linear expansion and unconfined compressive strength (UCS) tests were carried out to evaluate the benefits of mellowing. The test results suggested that the mellowed test specimens achieved better UCS and swelling properties compared to the unmellowed specimens. Mellowing at 1.2 OMC produced better strength performance than at 1.4 OMC, whereas mellowed specimens at 1.4 OMC showed better resistance to linear expansion compared to 1.2 OMC. The research findings suggested that optimal performance was achieved by mellowing at the higher initial moisture condition of 40% OMC and compacting the materials at the lower moisture condition of 1.2 OMC.
Original languageEnglish
Article number2187
Number of pages12
JournalMaterials
Volume16
Issue number 6
DOIs
Publication statusPublished - 9 Mar 2023

Keywords

  • ettringite
  • mellowing
  • Calcium-based stabilizer
  • Silica fume
  • compressive strength
  • linear expansion
  • swelling

Fingerprint

Dive into the research topics of 'Effects of Mellowing Practice on the Strength and Swelling Properties of Road Construction Materials: Case of Sulphate-Bearing Clay Soils Stabilised with Lime-Silica Fume Blended Binder'. Together they form a unique fingerprint.

Cite this