Research and evaluate the potential of rice husk ash and rice straw ash for soil improvement in Vietnam

Abstract

Rice husk ash and rice straw ash are common agricultural wastes in
developing countries. Currently, utilizing these wastes in the construction
sector such as soil improvement and cement concrete production is a
trend in many areas around the world. In Vietnam, with a rice production
of more than 40 million tons/year, millions of tons of rice husk ash and
straw ash can be generated. This is an abundant and a cheap material
source. This article will research and evaluate the potential of rice husk
ash and straw ash for soft soil improvement in Vietnam. Research results
show that straw ash and rice husk ash are materials having high pozzolan
activity. Various studies in the world and some studies in Vietnam showed
that rice husk ash and straw ash not only improve some physical and
mechanical properties of soil but can also partially replace the amount of
binder. Vietnam has different types of soft soil and construction activities
are increasing, so the demand for improving soft soil is also increasing. In
which, improving soil with cement binder is one of the most popular
methods. Therefore, rice husk ash and rice straw ash have great potential
to combine with cement in improving soft soil in Vietnam. Utilizing these
wastes not only helps reduce the negative impact their causes on the
environment but also helps improve construction quality and reduce
construction costs