XRDF, SEM and Compressive Strength Properties of a New Alkali Activated Fly Ash Concrete Mortar
This paper reports the results of laboratory studies on the mechanical and chemical properties of alkali activated fly ash concrete mortar. A new hydraulically bound cementitious material made from environmentally friendly waste fly ash and subjected to physico–chemical activation has been developed in this study. In the production of the new cement, fly ash initially has been activated by grinding the fly ash using mechanical grinding and the addition of FGD and or GGBS. The new cementatious materials containing 35% Ordinary Portland Cement (OPC) and 65% of grinded fly ash. The mix then further activated by the use of NaOH of 4 M molarity. NaOH has been added to the mix at 1%, 2% and 3% of fly ash. Alkali activated fly ash where then subjected to curing at normal room temperature for one day.
The paper report the compressive strength of the results at age of 3, 7 and 28 days.
Samples shown significant improvement in the compressive strength. The reasons for the development of strength of the new material products was studied and explained using both SEM and XRDF analysis and reported in this study.
KeywordsCementitious materials Fly ashes Bottom ash Cement mortar compressive strength
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