Alper Bideci

Analysis of shrinkage and creep behaviors in polymer-coated lightweight concretes

Abstract The 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.

POMZA AGREGALI HAFİF BETON ÖZELLİKLERİNE KALSİYUM ALÜMİNAT ÇİMENTOSUNUN ETKİSİ

B Teknolojinin ilerlemesiyle beraber ozel betonlarin uretimi hiz kazanmistir. Bu calismada, %100 kirmatas agregali betonun iri agregasina (elek capi 4/8 - 8/16 mm) farkli oranlarda (%25 ve %100) pomza agregasi ikame edilerek uretilen CEM I 42,5R ve Kalsiyum Aluminat Cimentolu (CAC) betonlarin fiziksel ve mekanik ozelliklerinin karsilastirilmasi amaclanmistir. Bu amacla uretilen taze beton numuneleri uzerinde birim agirlik ve yayilma deneyi; sertlesmis beton numuneleri uzerinde kuru birim agirlik, basinc dayanimi, yarmada cekme ve egilme dayanimi deneyleri yapilmistir. Calismanin sonucunda, tum beton numuneleri icerisinde en yuksek basinc dayanimi %100 kirmatas agregali CEM I 42,5 R (100-CSCEM) beton numunelerinden elde edilmistir.