A comparative study between brick and stone aggregate concrete using rice husk ash as partial cement replacement

Abstract

Today's world cannot be imagined without the application of concrete. Although as a constituent of concrete stone aggregate is mostly used, there are certain areas on this earth where it is scarcely available which leads to the use of brick aggregate. Moreover, as supplementary cementitious material, use of rice husk ash is beneficial to our environment. So, the study presents the possibility of using the brick aggregate and rice husk ash to the possible extent in making concrete by comparing stone and brick aggregate concrete, with rice husk ash as partial cement replacement. The specimens were prepared using water to binder ratios varying from 0.38 to 0.54. Properties of fresh and hardened concrete were measured using different tests on the specimens.The results of the mechanical tests were also co-related with the microscopic image studies.This study finds that for a higher grade of concrete optimum rice husk ash replacement varies between 5 % to 10 % and for lower grade of concrete the rice husk ash replacement varies between 10 % to 15 %. The study also shows that using rice husk ash, brick aggregate concrete exhibits better improvement in comparison to stone aggregate concrete.

Application of rice husk ash in brick aggregate concrete to improve the permeability and resistance against acid and sulfate attack

“…This observation concludes that more water allows more accumulation of rice husk ash in concrete for an effective application. Similar observations also have been done in other studies related to strength and workability [24,25,46].…”

“…Additionally, the use of the material in the construction field can solve the environmental issues caused by the improper dumping of this waste material [23]. Similar to stone aggregate concrete, brick aggregate concrete properties can also be improved by the use of rice husk ash [24,25]. It was also found that the use of this material in brick aggregate concrete is more effective than in stone aggregate concrete [25].…”

“…Similar to stone aggregate concrete, brick aggregate concrete properties can also be improved by the use of rice husk ash [24,25]. It was also found that the use of this material in brick aggregate concrete is more effective than in stone aggregate concrete [25]. The studies of brick aggregate concrete modified with rice husk ash (brick-ash concrete) are very limited and only two experimental studies have evaluated the strength of this type of concrete.…”