G. Venkatappa Rao

Bio: G. Venkatappa Rao is an academic researcher from Indian Institutes of Technology. The author has contributed to research in topics: High-density polyethylene & Triaxial shear test. The author has an hindex of 2, co-authored 2 publications receiving 133 citations.

Compressibility and Strength Behaviour of Sand–tyre Chip Mixtures

Abstract: Scrap tyres can be shredded into chips and can easily be mixed with granular soils. To assess the behaviour of the admixtures, compressibility and triaxial compression tests were carried out by varying chip size and chip content. The results demonstrated that sand–tyre chip mixtures up to 20% could be a potential material for highway construction and embankment construction up to around 10 m height.

Regression Models for Predicting the Behavior of Sand Reinforced with Waste Plastic

Abstract: This paper presents regression models for predicting the behavior of sand mixed with waste plastic For this purpose, drained triaxial compression tests with strain measurements were conducted on sand mixed with waste plastic LDPE strips and HDPE strips The joint effects of LDPE strip content (up to 015%), HDPE strip content (up to 2%), aspect ratio (up to 2), and confining pressure (up to 276 kPa) on the behavior of sand, using multiple regression analysis, were investigated for ground improvement Utilizing some portion of waste plastic in this way will reduce the quantity of plastic waste requiring final disposal in landfills

Recycling waste rubber tyres in construction materials and associated environmental considerations: A review

Abstract: Waste tyres and their accumulation is a global environmental concern; they are not biodegradable, and, globally, an estimated 1.5 billion are generated annually. Waste tyres in landfill and stockpiles are renowned for leaching toxic chemicals into the surrounding environment, acting as breeding grounds for mosquitoes, and fuelling inextinguishable fires. The properties of waste tyre rubber and engineering applications have been previously reported in a range of publications with respect to the environmental, economic, and technical factors. This study compiles and reviews this research with a focus on geotechnical engineering applications, such as earthworks and infrastructure construction. The applications of waste rubber in construction materials includes cementitious concrete, asphalt concrete, and granular materials for earth structures. Crumb rubber, when used as a sand replacement in flowable concrete fill, improved ductility and strength-to-weight ratio. A 40 MPa concrete mix with 0.6% rubber crumb content exhibited optimal strength and air entrainment capabilities, displaying minimal damage after 56 freeze/thaw cycles. Rubber, as a partial replacement for aggregate in road base and sub-base layers, adversely affected the California Bearing Ratio (CBR) of the graded aggregate base course. Rubber-soil mixtures as the interface of foundation and structure yielded a 60–70 % reduction in vertical and horizontal ground accelerations when subjected to earthquake simulation modelling. There is concern regarding the toxicity of waste rubber incorporated products due to leachates of heavy metals and other chemicals common in tyres. Further comprehensive studies in this area are needed. Leachate studies should be conducted under different pH and liquid to solid ratios.

Shear and Compressibility Behavior of Sand-Tire Crumb Mixtures

Abstract: Scrap tire disposal has been a critical environmental problem in many urban cities due to the huge increase in the number of vehicles. Significant research efforts have been devoted in recent years to explore the use of scrap tires in civil engineering application, as reuse or recycling of scrap tires is the preferred option from a waste management perspective. This paper investigates shear and compressibility behavior of sand–tire crumb (S-TC) mixtures for their application in civil engineering projects. Unlike other studies where tire chips or tire shreds were used, shear strength of the S-TC mixtures has been found to decrease with the increase in the amount of tire crumbs in the mixtures. Significant increase in axial strain corresponding to peak deviator stress has been observed. This can be related to the ductility capacity of the mixtures, as confirmed by brittleness tests. It has also been observed that a larger proportion of plastic strain develops after the first cycle of unloading, and ...