Fresh and Microstructural Properties of Saw Dust Ash (SDA) Admixed with Millet Husk Ash (MHA) in Self Compacting Concrete (SCC)

Abstract

comABSTRACTThe quest to mitigate the high cost and the environmental hazard associated with cement production has increased globally. Saw dust ash (SDA) and Millet husk ash (MHA)were obtained by burning at temperatures between 600ºC-650ºC and used at a varied mix proportion of 0%, 5%, 10%, 15%, 20%, 25%, and 30%. SDA and MHA were employed to partially replace Ordinary Portland Cement (OPC) in the production of grade 40 self-compacting concrete (SCC). To enhance the strength properties of SDA-SCC, an optimum dose of MHA was incorporated to produce SDA-MHA-SCC. Several trial mixes per standard specifications were conducted to obtain grade 40 SCC with a suitable proportion of plasticiser at 7.49 kg/m3 and a water-to-binder ratio of 0.37. They revealed the study that SDA-SCC's slump flow and passing ability reduces with an increase in SDA content in SCC and improvement in the resistance against segregation of MHA-SDA-SCC. Also, MHA has satisfied the requirement of ASTM C618 for good pozzolana.

Keywords

• cement
• millet husk ash
• saw dust ash
• fresh properties
• self-compacting concrete