Al-Waked Qusai, Kinuthia John M, Adeleke Blessing O, Oti Jonathan, Khalifa Ahmed
Faculty of Computing, Engineering and Science, University of South Wales, Pontypridd CF37 1DL, UK.
Elkem ASA, Kristiansand, 8040 Vaagsbygd, Norway.
Materials (Basel). 2023 Mar 9;16(6):2187. doi: 10.3390/ma16062187.
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.
本研究的主要目的是确定陈化的益处，以及在稳定化过程中压实陈化后的含硫酸盐黏土的最佳含水量（OMC）。在最终压实之前，以30%或40% OMC的不同初始含水量进行了两种为期三天的陈化方案。未陈化的试样在与混合稳定剂混合后立即压实。使用了生石灰（L）与可持续副产品硅灰（SF）按1:1比例（2%L - 2%SF）的混合物。进行了线性膨胀和无侧限抗压强度（UCS）试验以评估陈化的益处。试验结果表明，与未陈化的试样相比，陈化后的试样具有更好的UCS和膨胀性能。在1.2 OMC下陈化产生的强度性能优于在1.4 OMC下陈化，而在1.4 OMC下陈化的试样与1.2 OMC相比表现出更好的抗线性膨胀能力。研究结果表明，在40% OMC的较高初始含水量下陈化，并在1.2 OMC的较低含水量下压实材料，可实现最佳性能。
