Browsing by Author "Memis S."

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Effect of high volume fly ash and micro-steel fiber on flexural toughness and durability properties in self-compacting lightweight mortar (SCLM)
(2021-11-08) Kaplan G.; Bayraktar O.Y.; Memis S.
In this study, high volumes of fly ash and micro-steel fiber were used to improve lightweight aggregate mixes' strength and durability properties that can be used in the prefabrication industry. The developed composite can be used in roof truss flooring of steel structures and bridge decks. Although the unit weight of the mixtures was reduced below 2000 kg/m3, micro steel fibers were used to improve the behaviour against seismic effects. The increase in fly ash content increased the porosity, water absorption, and water penetration depths of the mixes. The increase in the steel fiber content created a micro-filter effect, reducing the water absorption and water penetration depths. The hardened unit weights of the mixes vary between 1305–1723 kg/m3, while their 91-day compressive strength varies between 30.9 and 46.4 MPa. It has been observed that the mixes using steel fiber are in the medium and good class in the residual strength factors specified in ASTM C 1018. The carbonation depth of the mixes using 50% fly ash increased more than 5.5 times compared to the reference mix. After the freeze–thaw effect, spills occurred on the surfaces of the mixes due to fiber corrosion.
Investigation of the effect of press compaction and the use of zeolite on mechanical properties in the production of low strength Reactive Powder Concrete (RPC)
(2019-05-01) Memis S.; Sahin S.
In this study, reaktive powder concrete (RPC) samples obtained from ground zeolite mixed with cement, gypsum and lime were produced by using a press compacting processes and steam-curing. The compressive strength, density and water absorption properties of the samples were determined. According to experimental results, while dry unit weight is varied between 1477 and 1677 kg m- 3, compressive strength of 28 days specimens ranged from 7.3 to 25.3 MPa and water absorption changed approximately between 19% and 9%. Building materials produced from addition of low-rate cement, gypsum and lime to ground zeolite using the pressure method had generally better physical and mechanical properties as compared to the traditional building materials.