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Öğe Analysis of shrinkage and creep behaviors in polymer-coated lightweight concretes(Walter De Gruyter Gmbh, 2016) Bideci, Alper; Bideci, Özlem Sallı; Oymael, Sabit; Yıldırım, HasanThe creep and shrinkage properties of polymer-coated lightweight concretes were examined. Five-hundred-dose lightweight concretes were produced by coating pumice aggregates with three different polymers (Sonomeric1: SNMC, KB Pur 214: KBP, and Polipol3455: PLP). The 3-, 7-, and 28-day compressive strength values of the obtained lightweight concrete samples were determined, and the 840-h and 12-month creep and shrinkage deformations were measured. It was found that the ductility of the SNMC- and KBP-coated concrete samples increased, while their shrinkage deformation results decreased when compared with the control samples. In contrast, the ductility of PLP concrete samples decreased and the shrinkage deformation became higher. In conclusion, the use of SNMC- and KBP-coated pumice aggregates had a positive effect on the creep and shrinkage properties of the concrete. Furthermore, it was observed that the compressive strength values of the lightweight concretes made of the coated samples were higher than those of the control sample.Öğe Internal structure examination of lightweight concrete produced with polymer-coated pumice aggregate(Elsevier Sci Ltd, 2013) Bideci, Alper; Gültekin, Ali Haydar; Yıldırım, Hasan; Oymael, Sabit; Bideci, Özlem SallıIn the construction sector, pumice is observed to be used in both structural and non-structural building elements. In this study, to produce a new kind of concrete, the aggregates are coated with three different polymers (Sonomeric1 : SNMC, KB Pur 214: KBP and Polipol3455: PLP) that have multiple uses. The mineralogical-petrographical features of both polymer-coated and uncoated aggregates were examined, and SEM (Scanning Electron Microscope) and XRD (X-ray Diffraction) analyses were performed. Moreover, in the study, lightweight concrete elements with different dosages (300, 400 and 500) were produced by using polymer-coated and uncoated aggregates; and their internal structure examinations were performed and compressive strength values of 3, 7 and 28 days samples were investigated. As a conclusion; among the aggregate samples, it was determined that PLP-coated aggregates have a more porous structure than the other polymer-coated aggregates and KBP-coated aggregates could be used in lightweight concrete (500 dosage) production. It was also concluded that the compressive strength values of lightweight concrete elements produced with coated samples increased even more. (C) 2013 Elsevier Ltd. All rights reserved.Öğe Lightweight aggregates coated with colemanite(Techno-Press, 2017) Bideci, Alper; Bideci, Özlem Sallı; Oymael, Sabit; Gültekin, Ali Haydar; Yıldırım, HasanTechnological advancements in the field of building materials are achieved day by day. In this study, a new lightweight concrete aggregate is produced by mixing certain rates of colemanite (0%, 7.5%, 12.5%, 17.5%), cement and coating the surface of pumice aggregate with this mixture. Thin aggregate sections are analyzed with specific gravity, unit weight, water absorption, impact, and crushing experiments. In this way, the production of cement and cement+colemanite coated lightweight concrete aggregates is investigated and an opinion on the likely behavior of these concrete types is provided.Öğe Permeability features of concretes produced with aggregates coated with colemanite(Techno-Press, 2015) Bideci, Özlem Sallı; Bideci, Alper; Oymael, Sabit; Gültekin, Ali Haydar; Yıldırım, HasanIn the world total boron reserve rating, Turkey is taken place on the first rank, meeting the demand of refined mineral and main boron chemicals. Development of the new boron products and production technologies, spreading the using area of the boron are the study topics which must be finically discussed. In this study, with the help of colemanite taken in ratio as (0%, 7.5%, 12.5%, and 17.5%) by being mixed by the cement, surfaces of the pumice aggregates have been covered. Permeability of the samples has been investigated by producing lightweight concrete with 400 dose with the help of aggregates covered with colemanite. For this, the experiments of water absorption, capillary water absorption, depth of penetration of water under pressure and rapid chloride permeability have been performed. In addition, analyses of the thin section of covered and uncovered pumice aggregates and SEM (Scanning Electron Microscope) have been investigated. When the control samples produced with the covered aggregates and concretes produced with colemanite covered aggregates are compared each other, it has been determined that special lightweight concretes whose values of capillary water absorption experiment, depth of penetration of water under pressure experiment and rapid chloride permeability are low can be produced.Öğe Polymer coated pumice aggregates and their properties(Elsevier Sci Ltd, 2014) Bideci, Özlem Sallı; Bideci, Alper; Gültekin, Ali Haydar; Oymael, Sabit; Yıldırım, HasanPumices which are preferred due to their properties such as low unit weight, heat insulation property, resistance against fire were combined with polymer, the material of our age, to produce light concrete aggregate. In the study, pumice aggregate was coated by some polymers which are used for various purposes (Sonomeric1: SNMC, KBPur 214: KBP and Polipol3455: PLP) and the inner-structure examinations of the obtained aggregates was made by microscope and also specific weight, loose unit weight and water absorption experiments were applied. At the end of the study, the properties of pumice aggregates having high water absorption capability were developed and light aggregate production was realized. (C) 2014 Elsevier Ltd. All rights reserved.
