Using Cement By-Pass Dust and Fine Dune Sands in Semi-Flexible Pavement Applications

Mohamed Abd elaziz Shalaby, Metwally Goda Al- Taher, Ahmed Mohamady Abd Allah, Mohamed Ibrahim Attia

Abstract


In many countries around the world, grout is used to produce semi-flexible pavement mixtures. Grout is formed by mixing cement with water. Additives such as fine silica sand, silica fume, fly ash, and plasticizer are used in grout production to improve the workability and mechanical properties of the grout. In Egypt, fine dune sands and cement by-pass dust are abundantly available. This study aims at evaluating the suitability of using fine dune sands and cement by-pass dust to replace Portland cement in producing grout mixes suitable for semi-flexible pavement applications. To achieve the study objective, three groups of grout mixes were investigated; The first group is control mix using ordinary Portland cement only. The second group composed of ordinary Portland cement with fine sand. The last group composed of ordinary Portland cement with cement by-pass dust. The percentage of water needed for mixing was determined using Marsh funnel. Volumetric properties of grout mixes were then determined. Unconfined compressive strength and indirect tensile strength tests were conducted on samples casted from these mixes at 7 and 28 days of curing to define their mechanical properties. It was found that Replacing 25% of the cement with fine sand dune achieved good viscosity and high compressive and tensile strength, and offered cost savings compared to the control mix. While using of cement by-pass dust resulted in reducing the strength of grout mixes. 


Keywords


Cement by-pass dust, Fine dune sands, Grout, and Semi-flexible mixtures

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References


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