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    Improved Engineering Properties of SWC and OPC-Treated HPC Soil
    (Springer Science and Business Media Deutschland GmbH, 2025) Mollamahmutog?lu, Murat; Avci, Eyübhan; Yildirim, Eray; Deveci, Emre; Uysal, Melih
    In this research, it was aimed to treat high plasticity clayey (HPC) soil with super white cement (SWC). To determine the effectiveness of SWC in the stabilization of HPC soil, ordinary Portland cement (OPC) was also used in the experimental studies for the purpose of comparison. As the unconfined compressive strength (UCS) values of SWC-treated HPC specimens dried in open air showed an increase of 390%, the UCS values of wet-cured specimens showed a 235% increase. In addition, while the UCS values of OPC-treated HPC specimens dried in open air displayed an increase of 235%, the UCS values of wet-cured specimens displayed a 130% increase. Both stabilizers were also effective in reducing the swelling pressure and the swelling percentage of HPC soil. The swelling pressure and percentage of HPC soil treated with OPC were reduced by 50 and 90% respectively. As the compressibility of HPC soil stabilized with SWC was reduced by 95%, the compressibility of HPC soil stabilized with OPC was reduced by 88%. The UCS, swelling and compressibility tests have shown that New type cement of SWC is a more effective material than OPC in improving the engineering properties of HPC. © The Author(s), under exclusive licence to Shiraz University 2025.
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    Properties of superplasticizer-amended superfine cement grouted sand
    (Fundatia Serban Solacolu rev.romana.de.materiale@gmail.com, 2019) Mollamahmutog?lu, Murat; Avci, Eyübhan
    The effect of superplasticizer on the grouting performance of superfine cement and the engineering properties of grouted sand were investigated. At first, the bleeding, setting time, and viscosity tests were conducted to determine the rheological characteristics of superfine cement grouts with or without superplasticizer at different water-cement ratios. Thereafter, the groutability of superfine cement grouts into various graded sand specimens with or without superplasticizer were tested. Those specimens grouted successfully were then subjected to unconfined compression tests at different time intervals. The addition of superplasticizer to superfine cement grouts increased their bleeding, initial and final setting times but decreased their viscosities. As the unconfined compressive strength (UCS) of superfine cement grouted sand specimens increased with the addition of superplasticizer. It was shown that the engineering properties of superfine cement grouted sand specimens were better improved with the addition of superplasticizer. © 2019, Fundatia Serban Solacolu. All rights reserved.
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    Stabilization of Clayey Soil with Alkali-activated Hybrid Slag/Cement
    (Budapest University of Technology and Economics, 2024) Yildirim, Eray; Bol, Ertan; Avci, Eyübhan; Özocak, Aşkin
    This study investigates the stabilization performance of clayey soil treated with alkali-activated hybrid slag/cement. Sodium silicate (SS) and sodium hydroxide (SH) are used as alkali activators, whereas ground blast furnace slag (GGBS) and ordinary Portland cement (OPC) are used as sources of aluminosilicate. A total of 27 different types of mixtures are used for stabilization. Unconfined compressive strength (UCS) of untreated clay and stabilized soils are performed at immediately, 3-, 7-, 28-, and 90 days curing times under air-dried and wet-cured conditions. In addition, 90-d volume and mass changes in the samples are measured. Stabilized samples with an SS/SH ratio of 1 under air-dried conditions reveal moistening at early curing ages (?28 days); afterward, sodium carbonate crystals appear in these samples at longer curing ages. Geopolymer-treated clayey soil exhibits lower volumetric and mass changes compared with OPC. Most of the stabilized clayey soil with alkali-activated hybrid slag/cement exhibits higher strength compared with OPC under air-dried and wet-cured conditions. © 2024, Budapest University of Technology and Economics. All rights reserved.