Comparative Study on Effect of Fly Ash and Rice Husk Ash on Strength of Concrete

The construction of concrete pavement is growing across the country due to its strength, durability, better serviceability & overall economy in long run. The need is to develop better quality pavement sections, which can bear heavy loads. This can be achieved by using high compressive strength concrete (>40MPa) made up of hydraulic cement having fine & course aggregates. In the work embodied construction work is done with the help of wastage from industry. Fly ash is a by-product of burned coal from thermal plants and Rice husk ash is the by-product of burned rice husk from paper plant. Considerably Fly ash and Rice husk ash are used as supplementary cementing materials to improve the properties of cement concrete. The present study is done to develop pavement quality concrete by partially replacement cement with Fly Ash & Rice Husk Ash. The aim of study is to compare the strength characterises of pavement concrete which as achieved by concrete mixtures. The work done in this study shows the effects on the behaviour of concrete produced from cement with combination of FA and RHA at different proportions on the mechanical properties of concrete such as compressive strength, flexural strength. The replacement of cement were done at three levels is 10%, 20% and 30% with both Fly ash & Rice husk ash as well as combination of both Fly ash and Rice husk ash. The tests on hardened concrete were destructive in nature which includes compressive test on cube for size (150 x 150 x 150 mm) at 7 and 28 days of curing as per IS: 516 1959, Flexural strength on beam (150 x 150 x700 mm) at 28 days of curing as per IS: 516 1959. The samples were prepared with different water-cement ratio as 0.30, 0.35 & 0.40 for flexure design i.e. 5.5 MPa, 5.0 MPa & 4.5 MPa respectively. The result so obtained showed that it is possible to achieve saving in cement if replacement is done. The study proves to be beneficial in area where traffic load is less, also will use wastage released from thermal plants & rice mills also reduces economy as this materials is easily available. The waste material from industries is in bulk amount, as lesser amount of these used as supplementary cementing materials so these can be used as filling soil in subgrade of highway pavement. Mir Fairoz Akhter | Faiyaz Azam | Dr. Asif Hussain"Comparative Study on Effect of Fly Ash and Rice Husk Ash on Strength of Concrete" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-2 | Issue-5 , August 2018, URL: http://www.ijtsrd.com/papers/ijtsrd18169.pdf http://www.ijtsrd.com/engineering/civil-engineering/18169/comparative-study-on-effect-of-fly-ash-and-rice-husk-ash-on-strength-of-concrete/mir-fairoz-akhter