Study of pozzolanic properties of wheat straw ash

As an agricultural product, wheat straw contains considerable amounts of SiO2: When burned it leaves an ash very rich in SiO2 that has a pozzolanic character. Wheat is an important agricultural product in Turkey. In this study, wheat straws are ground to 1–5-mm size and subjected to preburning treatment. The preburned material is later burned in controlled conditions for 5 hours at 570 and 670°C. The ash is cooled suddenly and ground to 90–200 μ size. The standard test specimens are produced from ash and mechanically, chemically, and physically tested for determination of its pozzolanic properties. It is obtained that the ash has pozzolanic activity.