Flexural beam fatigue strength evaluation of crushed brick as a supplementary material in cement stabilized recycled concrete aggregates

Modulus of rupture evaluation of cement stabilized recycled glass/recycled concrete aggregate blends

The process of removing sediments from the bottom of dams generates large amounts of dredged sediments, which are considered waste. The purpose of this research was to present the results of testing conducted on dredged sediment stabilized with ordinary Portland cement (OPC) and fly ash (FA) for reuse as pavement materials. The base sediment was high plasticity silt (MH) based on the Unified Soil Classification System (USCS). The experiments in this study consisted of unconfined compression (UC), California bearing ratio (CBR), and resilient modulus (Mr) tests on stabilized dredged sediment. A combination of scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX) was used to investigate the microstructures of the stabilized specimens. Finally, a simple comparative cost analysis between roads using conventional earthen materials and stabilized dredged sediment was performed. The results showed that the unconfined compressive strength (qu), CBR, and Mr improved the pavement materials from unsuitable to suitable, and a 10% FA content provided the optimal strength enhancement. The SEM images showed that the calcium silicate hydrate (CSH) product, which was formed by hydration and pozzolanic reactions, attached to the clay clusters and filled the pore spaces between clay particles, resulting in a denser sediment structure. The EDX analyses showed that the calcium weight proportion and the silica-aluminum ratio were important factors in improving the strength of the dredged sediment treated with OPC and FA. These EDX results agreed with the qu, CBR, and Mr results. For the studied situation, roads using stabilized sediment were 1.5 times more economical than roads using conventional earthen pavement materials. Dredged sediments treated with OPC and FA can be sustainably reused as pavement materials based on the Department of Highways of Thailand standard, as well as the recommendations of Austroads (2017). Thus, for suitable sediments, reuse in road and pavement construction may be considered with appropriate treatment and conditioning.

Sustainable reuse of dredged sediments as pavement materials by cement and fly ash stabilization

Dredged sediments excavated or removed from reservoirs are classified as waste materials. The reuse of dredged sediments as road materials is an interesting solution to environmental problems. Howe...

Mechanical and microstructural properties of dredged sediments treated with cement and fly ash for use as road materials

https://researchbank.swinburne.edu.au/file/ab27a518-2a67-4455-87fe-0e72965ecb52/1/Kym Lawrence Neaylon Thesis.pdf

The effects of heavy vehicle single, tandem and tri-axles on sprayed seal wear in Australia

The Austroads publication Guide to Pavement Technology, Part 2: Pavement Structural Design is intended to assist those required to plan and design new pavements. It was originally produced in 1987 as a result of review of the NAASRA Interim Guide to Pavement Thickness Design (1979). In 1992, the Austroads Pavement Design Guide was revised to include an updated procedure for the design of rigid pavements and also relevant portions of Chapter 6 (Pavement Materials) and Chapter 7 (Design Traffic). An essential element in the use of the Guide is a thorough understanding of the origins of the design procedures, their scope and limitations. Accordingly, this report contains the following five technical reports detailing the technical basis of: 1. Chapter 1: 1992 Guide procedures for the design of flexible pavements; 2. Chapter 2: 1992 Guide procedures for design of rigid pavements; 3. Chapter 3: Guide to Pavement Technology Part 2 Design of flexible pavements; 4. Chapter 4: Guide to Pavement Technology Part 2 Design of rigid pavements; 5. Chapter 5: Guide to Pavement Technology Part 2: Development of design charts for lightly trafficked roads

Geoff Jameson

Papers

Technical basis of Austroads Guide to Pavement Technology: part 2: pavement structural design