Durability Evaluation: Sustainable Semi-flexible Pavement Mixtures

Abstract

The modern paving industry requires the production of high-performance pavement using more sustainable approaches. Semi-flexible pavement (SFP), prepared by filling an open-graded asphalt skeleton with cement-based grouting material, has been shown to offer high performance for heavily loaded highway and airport pavement applications. The major aim of this study was therefore to evaluate SFP durability based on more sustainable preparation techniques and materials. In this research, a half warm bitumen emulsion semi-flexible mixture (HWBESFM) was designed using local materials and low energy heating technique; the contribution of various sustainable cementitious grout materials on the durability properties of the mix was then evaluated. The developed grouts were prepared using paper sludge ash (PSA) and silica fume (SF) as supplementary cementitious materials (SCM), and the durability of the HWBESFM was assessed with regard to ageing and water sensitivity. The results showed improvements in water sensitivity of HWBESFM containing OPC+PSA and OPC+SF to 66.62% and 65.73%, respectively, compared with the control mix, which demonstrated sensitivity of roughly 55%. Additionally, slight improvements were noticed in ageing resistance on incorporating SCM, those these results remained uncompetitive to traditional SFP mixtures. Overall, this initial investigation of a sustainable approach could, with some improvement, encourage further development and studies in this area.

Characterizing the Mechanical Properties of Cementitious Emulsion Grout for Semi-Flexible Mixture

“…Ordinary Portland cement (CEM I 42.5R) was used in this study, which is with the limits of the Iraqi requirements according to specification No: 5/1984 type I. the physical and chemical properties of such type of cement are listed in Table 1 Asphalt emulsion was supplied from Fosroc Company (under the commercial name of Nitoproof 10). Table 2 summarizes the Nitoproof 10 properties given by the manufacture [25]. -------Uniformlythoroughly coated CONMIX provided silica fume (SF).…”

Sustainable Potentials of Plastics Waste-cement Kiln Dust Blends on Strength Properties of Subbase Soil

“…However, creating and maintaining these types of structures requires a significant amount of non-renewable resources and industrial products, including bitumen, aggregates, subbase, cement, lime and other additives. It is unsustainable to manufacture and remove that many virgin building materials at once [7][8][9][10][11][12]. Depletion of natural resources wasted materials, destruction of the environment, and an increasing in cost of materials have all prompted scientists to create recycled products that may be used for producing of flexible roadway.…”

Efficient use of ceramic waste powder in Cementitious Grout for the Development of Sustainable Semi-Flexible Pavement Surfaces

“…Environmental pollution is a severe issue that must be carefully solved in Iraq and worldwide. Recently, waste material is one important source of pollution in the atmosphere, water, and soil due to the growth of the industrial world [1,2]. Cement dust is one of the causes of pollution in the environment, there are many cement factories in Iraq, such as Basra, Kufa, Muthanna, Kirkuk, Babel, and Karbala.…”