Abstract
The purpose of the research was to assess the possibility of using granulated expanded glass aggregate (GEGA) with cement grout as a replacement of a sub-grade and frost-protection layer, made of natural fine aggregates (NATU), stabilized with a hydraulic binder. Instead of traditional parts of the road construction, such as the sub-grade and frost-protection layer with the application of fine aggregate, stabilized with cement, the authors propose only one layer, made of lightweight water-permeable material, containing GEGA with a grain size from 8 to 11.2 mm. In the article the authors present the physical properties of the materials, applied for the road layers, the properties of the fine aggregate, stabilized with cement, and those of the cement composite with GEGA as an alternative solution. The laboratory test results of fine aggregates, stabilized with cement and of cement composites with GEGA, are presented. Porosity, volume density, compressive strength, and frost resistance are being researched. The results of those tests are meant to play an essential role in designing the thickness of road layers. Different types of pavement structure (asphalt and concrete) and different values of road load are being considered in the given work. The paper is concluded with considerations on an innovative solution, involving the use of ecological materials.
Highlights
The road construction sector all around the world is the largest consumer of natural aggregates [1].It is reported that global annual use of the aggregates constitutes over 40 billion tons, 90% of which is produced on the basis of natural resources
Volume density was determined for three samples, made of natural fine aggregates (NATU) and for three samples of the Volume density was determined for three samples, made of NATU and for three samples of the material, made of glass aggregate (GEGA): m0 material, made of GEGA: ρ0 =
The volume density of NATU and GEGA were determined at seven and 28 days, by measuring and weighing cylindrical samples according to Equation (1)
Summary
The road construction sector all around the world is the largest consumer of natural aggregates [1]. It is reported that global annual use of the aggregates constitutes over 40 billion tons, 90% of which is produced on the basis of natural resources. The use of industrial by-products in road construction can contribute to the discussion on reducing the consumption of natural resources and reducing the areas of landfills. Glass waste could be considered as a potential alternative secondary raw material in road construction [3,4,5,6]. Waste glass is an excellent material to be subjected to repeated recycling [7,8]. It is estimated that annually, in Europe, 11–40 kg of glass waste is generated per capita, depending on the country
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