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    Effect of cement grain size on the geotechnical properties of stabilized clay
    (Sharif Univ Technology, 2019) Mollamahmutoglu, M.; Avcı, Eyübhan
    In this study, some geotechnical properties of Microfine Portland Cement (MPC) and Portland Cement (PC) stabilized High Plasticity Clayey Soil (HPCS) samples were investigated. The results showed that liquid limit, permeability, swelling potential, and compressibility of HPCS were reduced, and HPCS's plastic limit and Unconfined Compressive Strength (UCS) were increased by both MPC and PC stabilizations. Besides, liquid limit, permeability, swelling potential, and compressibility of HPCS were further reduced by MPC. Although dry UCS of MPC stabilized HPCS sample was almost the same as that of PC stabilized HPCS sample, the plastic limit and wet cured UCS of MPC stabilized HPCS sample were higher than those of wet cured UCS of PC stabilized HPCS sample. In general, as the size of cement particles becomes finer, the stabilization of HPCS becomes more effective. (C) 2019 Sharif University of Technology. All rights reserved.
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    Strength and permeability of boric acid-tempered ultrafine cement grouted sand
    (Elsevier Ltd, 2021) Mollamahmutoglu, M.; Avcı, Eyübhan
    In this research, the groutabiliy of ultrafine cement (Ufc) grouts containing an additive of boric acid (BA) into the sand specimens with different particle size distribution and the engineering properties of grouted specimens were investigated. To begin with, the rheological characteristics of the neat UFC grouts having w/c ratios of 0.8, 1.0, 1.2, and 1.5 and those with 0.25, 0.50, 0.75, 1.0, 2.0, 3.0 contents of BA additive were determined. Later on, the groutability of various graded sand specimens were tested with the neat UFC and BA mixed grouts. Finally, the time-dependent strength and permeability tests were conducted on the successfully grouted sand specimen. With the addition of BA to UFC grouts, their setting times were extended but their viscosities, as well as their bleedings, were reduced. The groutability of UFC grouts was bettered with the addition of BA and the grouting pressure for the sand specimens was therefore reduced. The unconfined compressive strength (UCS) and the permeability of UFC grouted sand specimens were decreased with BA additive. © 2021 Elsevier Ltd