Sub-grade characteristics of soil stabilized with agricultural waste, constructional waste, and lime
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ORIGINAL PAPER
Sub-grade characteristics of soil stabilized with agricultural waste, constructional waste, and lime Abhishek Sharma 1
&
R. K. Sharma 2
Received: 3 May 2020 / Accepted: 13 November 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The waste generated from the agriculture and construction sector is a serious threat to the environment due to its disposal problems. This study is an attempt to utilize agriculture and construction waste to stabilize the geotechnical properties of clayey soil to use the composite as sub-grade material. For this purpose, rice husk ash (agriculture waste) and construction demolition waste (used construction waste) are mixed in varying amounts in clayey soil alone and along with lime to obtain the best subgrade material. The results of the experimental testing reveal that the geotechnical properties of clayey soil are improved by stabilizing it with various waste materials thereby solving their disposal problem thus sustaining a healthy environment. The use of wastes and lime in combination improves the unconfined compressive strength, California bearing ratio, and resilient modulus of the composite. The mix obtained on the addition of rice husk ash and construction demolition waste along with lime can be used as a sub-grade material thus achieving higher economic benefits. Keywords Rice husk ash . Construction demolition waste . UCS . CBR . Resilient modulus . Pavement thickness
Introduction Clayey soils, often deposited in semi-arid and arid regions all over the world, exhibit dual behavior of swelling and shrinkage, as these are susceptible to undergo large volumetric changes due to varying water content. Due to this behavior, these soils pose serious construction problems resulting in differential settlements to the structures resting over them. Due to the rapid growth in the infrastructure sector and limited availability of good soil (possessing adequate bearing capacity), the engineers are forced to build foundations over clayey soils possessing low bearing capacity. The stabilization of these soils using some pozzolanic materials and/or chemicals is adopted to improve their strength characteristics.
* Abhishek Sharma [email protected] R. K. Sharma [email protected] 1
Civil Engineering Department, Chandigarh University, Mohali, Punjab 140413, India
2
Civil Engineering Department, National Institute of Technology, Hamirpur, HP, India
The waste generated from different sources is a major concern to the environment due to its disposal problem. India’s economy primarily depends upon agriculture, and rice is a major grown crop in India contributing to more than 40% of the country’s total food production. During the processing of rice from paddy in rice mills, a lot of rice husk is generated which is a cellulose-based fiber containing around 20% silica. This rice husk is burnt and around 1/5–1/4 is changed into ash. The ash produced on the burning of rice husk is known as rice husk ash and is successfully used as an additive in re
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