Evaluation of Pozzolanic Activity of Rice Husk Ash


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Title: Evaluation of Pozzolanic Activity of Rice Husk Ash

Author(s): Shuichi Sugita, Masami Shoya, an Hiroshi Tokuda

Publication: Special Publication

Volume: 132


Appears on pages(s): 495-512

Keywords: acid resistance; agglomeration; carbonation; conductivity; compressive strength; drying shrinkage; freeze-thaw durability; rice husk ash; temperature; Materials Research

Date: 5/1/1992

The changes in physical and chemical properties of rice husk ash (RHA) fired at several temperatures from 400 to 800 C at 50 C increments were studied. The noncrystalline of RHA fired below 600 C could not be determined by x-ray diffraction (XRD), but it could be expressed by Luxan's method, which determines the variation in electric conductivity in a saturated solution of calcium hydroxide containing RHA. The effect of RHA on the properties of mortar, such as strength, drying shrinkage, resistance to acid attack, freeze-thaw resistance, and carbonation, was also determined. It was found that the compressive strength of RHA blended mortar with respect to that of plain mortar corresponded to the variation in conductivity. The RHA in mortar improved resistance to acid attack and developed the same degree of resistance to freeze-thaw action as that with silica fume, while it increased the drying shrinkage.