Compressive Strength of Roller Compacted Concrete Containing a Non-Standard High Calcium Fly Ash

Although roller compacted concrete (RCC) made with and without fly ash (FA) has enjoyed numerous application of dams, roads and large floors construction in Europe, Japan, Australia and Unites States since 1970s, it has not almost yet been used at all in Turkey despite abundant and economical sources of FA and cement. To some extend, in order to gain technical experience about RCC made with and without FA, a series of laboratory work was undertaken. In the present work, the RCCs were produced with three different cement quantity including 200, 300, 400 kg/m3 normal Portland cement (NPC). A local FA was also used in the concrete production with the replacement level of 0, 15, 30 and 45% by mass of NPC. The FA used was a non-standard and high calcium fly ash. Water-cementitious material ratios were determined using the vibrating slump test. Concrete cube specimens were prepared by vibration until complete compaction obtained. The compressive strength test was carried out. Although, the FA used is non-standard, the test results showed that it could replace the cement between 15 and 30% by mass, because FA concrete attained higher or comparable compressive strength property to the corresponding NPC concrete. From the strength property of view, it was concluded that RCCs produced and tested could be an alternative material for road paving or large floors construction.