[01] Saad Issa Sarsam, Department of Civil Engineering, College of Engineering, University of Baghdad, Baghdad, Iraq.

The reduction of environmental impact of production and usage of cement is achieved through the reduction of clinker content in concrete by partial replacement of cement with Nano additives. In this investigation, the partial replacement of cement with coal fly ash class F, limestone dust and iron fillings was examined. The effects of such Nano fillers on early-age properties of concrete were measured and compared. Typical combined gradation of aggregates with maximum size of 19 mm which is usually used for of concrete for rigid pavement construction was implemented, the ordinary Portland cement content was 300 kg/m³ and the water / cement ratio was 0.45. Three types of Nano materials (limestone dust, coal fly ash and iron filling) with 75 micron of maximum size have been implemented. Beam specimens of (280 x 70 x 70) mm size were prepared in the laboratory, cured for seven days, and then tested for water absorption and flexural strength. Such properties are considered essential for rigid pavement quality. It was concluded that the addition of coal fly ash or limestone dust in the range of (2-6)% as partial replacement of cement exhibit significant reduction in flexural strength as compared to reference mix as the additive content increases, while the iron fillings shows improvement in the flexural strength. On the other hand, the addition of fly ash, limestone dust, or iron filling shows significant reduction in the water absorption properties of concrete.

Absorption, Nano Materials, Concrete, Fly Ash, Limestone Dust, Iron Fillings, Flexural Strength

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