Abstract
In this paper, regarding the high availability of rice husk ash (RHA) in Guilan province, also, to decrease the geo-environmental issues caused by dumping RHA in the environment, different clay-sand mixtures are stabilized using the combination of cement and RHA. Polypropylene (PP) fibers are also used to decrease the growth of tensile cracks and increase the overall strength of samples. As the main scope, effect of sand content (in different conditions: with and without presence of RHA) on the compressive strength of stabilized and reinforced samples is investigated. In this regard, 28 day cured clay-sand samples are prepared and unconfined compressive strength (UCS) tests are conducted and the results are compared. It is obtained that with addition of 20% sand to the clay samples, their UCS increases in both cases of non-RHA and RHA-stabilized samples. Moreover, such behavior has been observed with the length of studied PP fibers. As the second scope, based on the conducted UCS tests on the 7-, 28- and 90- day cured clay samples, compressive strength of non-RHA samples are almost completely achieved in a 28-day curing period, while samples containing RHA continue to strengthening after such a period toward a 90-day curing period. Next, a simple relationship for the prediction of UCS of cement-RHA stabilized and PP reinforced clay is presented based on the evolutionary polynomial regression (EPR) technique. This relationship can be efficiently applied by construction engineers to obtain the appropriate mixture design for the stabilization of clay with cement, RHA and PP fibers.
Highlights
In recent years, with increasing the rate of civil constructions, the site soils should carry higher loads
The present paper aims to study the unconfined compressive strength (UCS) of clay and clay-sand mixtures stabilized with different cement and rice husk ash (RHA) percentages
Some practical and accurate relationships are, proposed to obtain the strength of cement-RHA stabilized and PP-reinforced clay based on Evolutionary Polynomial Regression (EPR) technique
Summary
With increasing the rate of civil constructions (e.g. skyscrapers, high dynamic loads, etc.), the site soils should carry higher loads. In this regard, different methods are applied to increase the bearing capacity of soils. Cement and lime are two conventional constructional material used as binders to stabilize different soils. Some other nonconventional materials such as industrial wastes, fly ash, bottom ash, pond ash, silica fume, ground granulated blast furnace and rice husk ash (RHA) have been used for such purposes [5,6,7,8,9]. One of the main reasons for replacing the cement with other waste materials is saving the money in the projects. RHA is a common supplementary material available worldwide as a waste material obtained from controlled burning of rice husks at a temperature of
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
