Waste utilization to enhance performance of road subbase fill

Abstract

Purpose The purpose of this study is to use waste materials in construction to create sustainable practices. This will contribute towards circular economy which has gained momentum in recent years throughout the world. Design/methodology/approach Waste materials cause enormous environmental problems that can have an adverse effect on the environment. Recycling of waste consists an important part of the circular economy. Therefore, researchers have been investigating the economic use of a variety of waste materials for reducing their environmental impact. One potential usage is in road subbase fill materials where wastes can be incorporated in large quantities. In this study, the engineering properties of road subbase fill materials (i.e. kaolinite) mixed with Granite Waste (GW), coal Fly Ash (FA) and lime are investigated. Kaolinite was replaced with 15% lime and FA, whereas the GW replacement varied from 10% to 20%. Testing included strength of the various soil compositions subjected to different curing times. Also the microstructural analyses and phase changes of samples were conducted using scanning electron microscopy and x-ray diffraction techniques, respectively. The results obtained indicate that GW can be incorporated in road base materials to improve its bearing capacity. The mixture consisting of 15% lime, 15% FA, 20% GW and 50% kaolinite resulted in maximum dry unit weight and optimum moisture content. Using GW exhibited a noticeable increase in the California Bearing Ratio of more than eight times at 1 day and 28 days curing regime compared with the control sample. Findings This study shows that GW and FA can be used for road subbase materials and can contribute toward a better and cleaner environment. Originality/value In this study, the engineering properties of road subbase fill materials (i.e. kaolinite) mixed with GW, coal FA and lime are investigated. This are value added in circular economy.

Improved of Mechanical Characteristics of Gargar Mud by Mineral Additives

“…This improvement can be explained by the cation exchange reaction between calcium ions of lime and the exchangeable ions of the soil surface, which produced a flocculated soil structure with an open soil fabric; consequently, the internal friction angle significantly improved and resulted in a higher CBR value. The same behavior was observed by other researchers [32][33][34][35] when studying the strength and microstructural behavior of lime stabilized subgrade soil in road construction. According to Figure 16, the combinations meeting the load-bearing criteria are soil+20% sand+20% natural pozzolana stabilized with 3% and 5% lime when the load-bearing index is greater than 25, so the stabilized soil can be used as a layer of foundation.…”

Prediction of recycled coarse aggregate concrete mechanical properties using multiple linear regression and artificial neural network

“…Therefore, countries with frequent cycles of demolition of old structures and construction works are exploring ways to use RA produced from such activities. Recycling and reuse of C&D waste are important for sustainable development and maintaining an eco-friendly green environment (Bui et al , 2017; Onturk et al , 2021).…”

A Novel Technique to Utilize Second Waste of Plastic Bottle as Soil Reinforcement: A Comparative Study on Mechanical Properties with Natural Black Cotton Soil

“…Pateriya et al [16] tried stabilising weak soil using marble waste blended with fly ash, cement, and nanomaterials, and the outcomes revealed that such a blended mix acts as a potential source for stabilising weak soil. ere has been a lot of research done on other waste items like granite waste, oxygen furnace slag, and fly ash [17,18]. Because of the presence of silica, glass wastes can be utilised in multiple ways in the construction industry: as fine aggregate in the form of glass powder [19,20], as glass fibres in fibre reinforced concrete [21], and even as a stabilising agent in weak soil [22,23].…”