Shear strength of high volume fly ash cement concrete beams
  Kode Venkata Ramesh and D.S.R Murty
  The most important and expensive constituent of concrete, Portland cement, is receiving prime attention and undergoing several modifications on its composition for beneficial needs. Currently the most essential concrete construction industry has become unsustainable due to numerous reasons. The exponential demand of portland cement, the principal constituent of concrete, is fraught with myriad problems, in its manufacture and use that include fast depletion of valuable natural resource, lime stone, extensive energy consumption, major contribution to green house gas emissions, that are implicated in global warming, climate change and finally the distress in concrete structures due to lack of durability. The need of the hour is to cap, increased productions of portland cement have to be capped. High volume fly ash (HVF) cement concrete developed by Malhotra and his colleagues at CANMET, Canada in the late 1980s incorporating as much as 55 to 60 percent fly ash in cement binder, resulting in substantial saving in portland cement, addresses sustainability issues effectively. The research, reported in this paper investigates, the shear strength of beams made of HVF cement concrete without web reinforcement. The beams had shear span/ depth ratio varying from 1.5 to 6. For comparison, identical companion beams with portland cement binder were also tested. The test results of the beams with two different binders are close enough. The measured strengths are compared with the theoretical values, computed by several national codes. The test results compare conservatively well with those predicted by the codes for both the binders, and advocate the beneficial use of HVF cement in structural concrete.