International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 09 Issue: 07 | July 2022
p-ISSN: 2395-0072
www.irjet.net
“Experimental Investigation on Effect of RBI Grade81 on Properties of Black Cotton Soil” 1Mr.
Puneeth K, 2Mr. Srivathsa H U and 3K.J.Suresha
1,2Assistant
Professor, Department of Civil Engineering, ATME College of Engineering, Mysore, India. of earth science, University of Mysore, Manasagangotri, Mysore-570006 ------------------------------------------------------------------------***------------------------------------------------------------------------Abstract- Roadways in India is developing at rapid state. A comfortable and economical movement of traffic is quite 3Department
essential nowadays. Pavement thickness mainly relies on soil properties and intensity of traffic. Engineering properties of soil subgrade depends on liquid limit (LL), Maximum dry density (MDD) and higher Optimum moisture content (OMC). Black cotton soils don’t suit for subgrades because of swelling property and causing tremendous damage to structure as well as for pavements. Globally these soils are considered to be a challenge for engineers. The present work is based on addition of new stabilization product, RBI Grade-81 to black cotton soil for enhancing its Engineering properties.
Key Words – Subgrade, RBI Grade-81, Black Cotton Soil. I.
Introduction
Black cotton soil mainly composed of clay mineral called Montmorillonite which has an unusual behaviour of swelling in the existence of moisture and develops shrinkage cracks in dry season. Due to the volumetric change in behaviour, the structures constructed on such soils will experience differential settlements, cracks in buildings or total destruction of the entire model. Structures built on such type of soil can be protected by treating the expansive soil with a non-expansive material. Enhancement of soil properties can be achieved by ground improvement technique like mechanical stabilization, chemical stabilization and reinforcing earth technique etc. Black cotton soil also called as expansive soil which is predominantly a clay soil greatly affected by moisture content. Due to the rise and fall in moisture content, the soil gets expanded, the pressure increases and subgrade of the structure losses its strength in turn reducing the load carrying capacity thereby the pavement failing process starts. Principle of soil stabilized road construction involves the effective utilization of local soils and other stabilizing agents. RBI Grade-81 an inorganic soil stabilizer, acts on soil to reduce the voids between soil particles and minimize the thickness of adsorbed water layer in the soil particles to achieve maximum compaction. RBI Grade-81 works on the principle of hydration reaction. Black cotton soil stabilized with RBI Grade-81 for various proportions i.e., 2% 4% 6% and 8% stabilizer and Laboratory tests are executed to estimate the efficacy of the stabilizer in stabilizing the soil. [1] Anitha.K. R etal investigates the effect of RB1-81 on different kinds of soils such as kaolinite, red soil, & Lateritic soil. Results of both soaked and un-soaked CBR value was increased significantly with the addition of RB1-81 for kaolinite, red soil & lateritic soil. Specimen were prepared for different percentage RB1- 81 i.e. (0%, 2%, 4%, 6%, & 8%) water content of 1% + OMC was added for preparation of specimen. Results showed that, soaked CBR increased 16, 14 & 4 folds with the addition of optimum percentage of RB1-81 recommended for red soil, lateritic and kaolinite respectively. The objectives of the present work are:
To ascertain the Engineering properties of Black cotton soil.
To determine the compaction characteristics of untreated soil and soil stabilized with RBI Grade-81 with varying dosages.
To study the strength characteristics of soil specimens with and without stabilizer from CBR test
To decide the optimum dosage of RBI grade-81.
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