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    The Investigation of Combined Effect of GBFS and Slaked Lime on Cement Paste and Mortar Properties
    (Gazi Univ, 2023) Aruntas, Huseyin Yilmaz; Sahinoz, Melih; Dayi, Mustafa
    In this experimental study, some physical and mechanical properties of the specimens produced by using a high ratio of slaked lime (SL) and ground blast-furnace slag (GBFS) in cement-based paste and mortar mixtures were investigated. Mixtures of pastes and mortars were prepared by replacing SK and GBFS with Portland cement at 10% SL+10% GBFS, 20% SL+20% GBFS, and 30% SL+30% GBFS ratios by weight. The workability of the produced mortar mixtures was kept fixed. The physical and mechanical experimental results obtained from the produced mortar mixtures were compared among themselves and with the control specimens. Consistency water, setting times, and volume expansion experiments were performed on paste specimens, and unit volume weight, compressive strength, and flexural strength experiments were performed on mortar specimens. Obtained experiment results showed that substituting SL and GBFS together with cement increased the amount of paste consistency water, decreased initial setting times, but increased final setting times, and decreased the unit volume weight and volume expansion. In addition, up to 30% replacement of SL and GBFS together reduced the 7, 28, and 90 days flexural and compressive strengths of the specimens.
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    Sustainable lightweight wall blocks from recycled construction waste: The role of diatomite in mechanical ecological and thermal optimization
    (Elsevier Sci Ltd, 2025) Cavus, Murat; Dayi, Mustafa; Aruntas, Huseyin Yilmaz; Kaplan, Gokhan
    This study evaluates the recycling potential of lightweight masonry blocks obtained from construction and demolition waste. The study used waste clay brick (WCB) and waste foam concrete (WFC) as fine aggregates to produce environmentally friendly lightweight masonry blocks. Diatomite, a natural pozzolanic material, was used as an additive in block production by replacing 10 %, 20 % and 30 % cement. The density of the material was reduced by using 6-7 % foam in the block mixtures. The produced samples' physical, mechanical, mineralogical, microscopic and thermal conductivity properties were analyzed. According to the experimental results, the density of the blocks varied between 0.98 and 1.12 g/cm3 , 28-day compressive strength was determined as 2.2-6.3 MPa and thermal conductivity coefficient as 0.15-0.21 W/mK. In mixtures where WCB aggregate was used, strength decreased while density increased; however, blocks produced with WFC aggregate showed higher compressive strength. The addition of diatomite increased the strength in the mixtures with WFC aggregate and decreased the strength in the series with WCB aggregate; however, diatomite significantly reduced the coefficient of thermal conductivity in all series. In SEM analyses, it was observed that the samples with diatomite addition had a more compact structure. XRD analyses revealed that diatomite reacted with calcium hydroxide to reduce the amount of Portlandite and consequently increased the strength. TG-DTA analyses show that diatomite contributes to the pozzolanic reaction. Thanks to the use of 30 % diatomite, carbon emissions and embodied energy in producing lightweight block elements have been reduced by 35-40 %. In addition, the cost of these blocks could be reduced by up to 45 % with 30 % diatomite. In conclusion, this study has demonstrated that WCB and WFC wastes can be used as fine aggregates in lightweight masonry blocks. The study offers a new approach to producing a sustainable building material by solving environmental problems.