Waste Paper Ash Pellets as Coarse Aggregate Replacement in Concrete

Abstract

Coarse aggregate is the important constituents in normal concrete (NC) and can be divided into three categories, normal, light and heavy weight aggregate. These aggregates are categorised according to their weight, density and properties. The lightweight aggregate is utilised and essential to reduce the density of concrete because with low density will reduce the dead loads and handling cost. Waste paper ash aggregate (WPAA) is proposed and incorporated in NC as a one of the artificial aggregate type. WPAA has been produced to replace the natural coarse aggregate and due to the environmental impact that occurred from the mining of coarse aggregate. The environmental problem is including a noise and air pollution, landslide, soil contamination, groundwater contamination, loss of biodiversity and erosion. Additionally, the human population growth is produced an industrial waste ash and dust such as wood dust, fly ash and etc. With a lot of problems existed, WPAA is taken from the newspaper industry in ash and then designed with using the ratio of waste paper ash to water of 2:1. The ash is mixed, pelletised, dried and sintered in the oven for 1 day with 200 0 C. The WPAA is replaced the coarse aggregate in concrete with various percentages by weight. The chemical, physical and mechanical properties of WPAA in concrete are investigated. Lastly, the result shown that the concrete mix with 2.0% replacement of WPAA by weight is illustrated a better compressive strength with a low cost production. WPAA in concrete is recommended to use in non-structural element, masonry industry or industrial building system component.