Comparison of lightweight and normal-weight aggregate concrete

Authors : Hatice ÇİÇEK, İsmail Ağa GÖNÜL
Pages : 619-626
Doi:10.24012/dumf.1142146
View : 54 | Download : 9
Publication Date : 2022-09-30
Article Type : Research Paper
Abstract :In this experimental study, lightweight aggregate concrete insert ignore into journalissuearticles values(LWAC); and normal-weight aggregate concrete insert ignore into journalissuearticles values(NWAC); were compared within the contexts of the size of calcium hydroxide insert ignore into journalissuearticles values(CH); crystals in interfacial transition zone insert ignore into journalissuearticles values(ITZ);, compressive strength, and oven-dry density. Six LWAC and NWAC mixtures were prepared for this study. In LWAC scoria aggregate, in NWAC gravel aggregate were used as coarse aggregate. Thirty-six images obtained from Scanning Electron Microscope insert ignore into journalissuearticles values(SEM); were used to determine the size of CH crystals in ITZ of LWAC and NWAC. Eighteen test specimens insert ignore into journalissuearticles values(three for each of the six LWAC and NWAC mixtures); were prepared in 150x300 mm sizes and in the form of cylinders for the compressive strength tests and also eighteen test specimens in 100x100x100 mm sizes and in the form of cubes for the oven-dry density tests. It was determined that the size of CH crystals in ITZ of LWAC is 8.43% less on average, compressive strength of LWAC is 39.09% more on average, and oven-dry density of LWAC is 10.97% less on average than the NWAC’s that has the same volumetric proportions of ingredients. The findings of this study show that lightweight aggregate that has high particle density, angular shape, rough surface texture, and a structure that enables chemical reaction with CH crystals will be beneficial for the ITZ microstructure and properties of concrete. It is considered that these properties should be taken into consideration in the selection of lightweight aggregate for structural concrete production.
Keywords : Lightweight aggregate concrete, normal weight aggregate concrete, interfacial transition zone, calcium hydroxide crystals, compressive strength, oven dry density

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