Laboratory evaluation of concrete containing nano-clay and rice husk ash (RHA)

It is necessary to carry out a fundamental revision in the method of construction and use of materials due to population growth and development of construction and environmental problems created in different societies, and on the other hand, as we know, cement is one of the most consumed materials in the world۱, and its production requires a lot of energy and causes environmental pollution. Cement is the source of about ۸% of the world's carbon dioxide (CO۲) emissions۲, so efforts should be made to reduce its negative effects by replacing cement with new materials, industrial or agricultural waste. This study has used rice husk ash (RHA)۳ as an agricultural waste and nano-clay as a new material and replacing it instead of cement used in concrete and has tried to investigate the mechanical characteristics of concrete. Therefore, ۱۰ mix designs were selected in this study and the compressive strength۴, tensile strength۵ and flexural strength۶ tests were investigated in a period of ۲۸ days. The obtained results show that the use of RHA and nano-clay at the same time has a very good effect on the mechanical properties of concrete, in such a way that the use of ۱۰% of RHA and ۱% of nano-clay results in a compressive strength of ۱۵%, the tensile strength has increased by ۸% and the flexural strength by ۷.۵% compared to the control sample. In general, it can be said that the use of these two materials simultaneously in concrete improves the mechanical properties of concrete and is considered very useful from an environmental point of view.

کلیدواژه ها:

concrete ، nano-clay ، rice husk ash (RHA) ، mechanical properties of concrete