Abstract:

The hardened and microbuilding properties of the added cement grids containing high volumes of flying ashes have been studied depending on the micronized calcium and flying ashes variables. In accordance with this purpose, the different flying aside-cement ratio and micronized calcium residence ratio are designed by twelve mixture, which are 0.0, 0.25, 0.54, 1.0 and 0%, 2.5%, 5% respectively. In different curve ages, according to the hardened characteristics and microbuilding characteristics, pressure resistance, ultrasonic sound wave experiment and scaned electron microscope analysis were performed respectively. The results of the experiment showed that in mixture containing micronized calcium, in mixture produced with a combination of flying ashes and micronized calcium, a remarkable improvement in early age hardening properties was achieved. In the SEM images, the results confirmed the pressure resistance test results. Although the increase in the use rate of flying ashes has resulted in a decline in early age pressure resistance, the results have been higher in the 90 day pressure resistance compared to the control mix as a result of nuclealization and chemical action mechanisms. With the control mix without micronized calcium, the pressure resistance values of the 35% flying ashes and 2.5% micronized calcium cement coat mixture for 90 days are respectively 43.2 MPa and 51.9 MPa, with the combination of calcium and flying ashes achieved a high level reduction in the carbon footprint of cement.

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