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Öğe Advance treatment by nanographite for Portland pulverised fly ash cement (the class F) systems(Elsevier Sci Ltd, 2015) Kirgiz, Mehmet S.This is a full article that overcomes such some negative side effects as rapid coagulation and reduced early strength in class F fly ash-substituted cement (FFA-SC) by serving nano graphite particle (nG). This study uses class F fly ash (FFA), nG, and ASTM type I cement as constituent materials to prepare proper pulverized fly ash Portland cement combinations (35% FFA + 65% ASTM I + 1.1% nG i.e.). Pastes include lime and/or lime + nG, and tap water to examine ups and downs in Ca(OH)(2) content. Mortars also contain these prepared cements, tap water and/or tap water + super plasticizer (SP), and mortar sand in order to measure fluidity, flexural strength, and compressive strength according to present standard methods. Results indicate for FFA-SC system that the nano graphite particle increases the reduced early strength gain at early age, and the SP reduces the rapid coagulation. The use of nG also shows to be favorable in terms of the Ca(OH)(2) content, the fluidity and the flexural strength gain, and compressive strength gain in FFA-SC system when compared to the pure Portland cement with and without nano graphite particle. (C) 2015 Elsevier Ltd. All rights reserved.Öğe Fresh and hardened properties of green binder concrete containing marble powder and brick powder(Taylor & Francis Ltd, 2016) Kirgiz, Mehmet S.This article discusses the use of high per cent by-products (i.e. marble powder, brick powder) in green concrete to develop a procedure which construction industry can use. This current study, therefore, uses marble powder and brick powder, crushed aggregate, CEM I 42.5N cement, and tap water for preparing green concrete. Overall substitution rate is maximum 40% in green concrete. Experimented properties are the rheology for fresh state of green concrete, SEM monitoring for hydration growth of cement paste, measuring the strength gains and theprojection properties for hardened state of green concrete at 7, 14, 28 and 90days. Results support this novel conclusion that a marginal increase for the experimented properties ofgreen binder concrete is due to the substitution of marble powder and brick powderfor fine aggregate and cement.Öğe Strength gain mechanism for green mortar substituted marble powder and brick powder for Portland cement(Taylor & Francis Ltd, 2016) Kirgiz, Mehmet S.This experimental research aims to carry out chemical characterisation and microstructure observation of cement paste as well as strength development monitoring of cement mortar up to 90days of curing. Cement paste and cement mortar is prepared by using marble powder (MP) and/or brick powder (BP) up to 35 and 65% by weight of pure Portland cement, sand and tap water. Green cement paste and green cement mortar is used to prepare several specimens, which are cured into water at 21 +/- 2 degrees C and 98% relative humidity until testing. Results indicate that substitutions up to 6% by weight of ground marble powder (MP) and 35% by weight of ground brick powder (BP), separately replacing pure Portland cement, positively influence compressive strength and flexural strength development with respect to the reference mortar prepared with pure Portland cement. However, MP enables a densification for microstructure of cement paste by increasing the strength gain as well as BP substitution exhibits opposite trend. Moreover, the substitution effect of MP on the strength gain of MP-based green mortar especially deals with fluctuation of calcium oxide (CaO), iron oxide (Fe2O3), sodium oxide (Na2O) and alkali in the MP-based green binder paste while the substitution effect of BP on the strength gain of BP-based green mortar relates to the continuously increase of calcium oxide (CaO) and iron oxide (Fe2O3) in the BP-based green binder paste.
