Influence of Waste Paper Sludge Ash (WPSA) and Fine Recycled Concrete Aggregate (FRCA) on the Compressive Strength Characteristic of Foamed Concrete

Abstract

In the effort to produce sustainable concrete, considerable attempt has been placed on replacing the main ingredients in concrete mixtures with more sustainable materials with the objective to reduce the carbon footprint. One of the replacement materials is waste paper sludge ash (WPSA), a local industrial by-product generated abundantly by newsprint mills which possesses considerable cementitious properties. Parallel to this, the high amount of construction waste, particularly concrete waste has become a difficult environmental issue to cope with in todays world. For this reason, recycling of concrete waste as a new alternative aggregate is being effectively utilized in concrete production. Thus, this paper reports on a study conducted to evaluate the compressive strength characteristics of the potential of using WPSA as a binder and fine recycled concrete aggregate (FRCA) as a virgin sand replacement in producing foamed concrete. The findings of this study exhibited that the inclusion of WPSA and FRCA for replacement ratios up to 20% and 15% respectively has significantly influenced the strength properties of foamed concrete.

A review on concrete recycling

“… The strength and physical quality of concrete mixtures with WPSA blended cement and RCA can be accurately assessed by measuring their compressive strength.  Incorporating WPSA in concrete contributes to the conservation of natural resources used in cement manufacturing, promoting a more sustainable and environmentally friendly concrete construction industry  By using RCA in concrete, greener concrete can be achieved  Different concrete strengths can be achieved by varying the proportions of coarse aggregates, RCA, and WPSA RCA usage in concrete can prove to be inexpensive as it is undesirable material that can be obtained freely without cost (36)(37)(38).…”

The examination study to investigate the effects of using a reduced amount of cement with WPSA

“…Employing these materials can give rise to challenges in discarding them, endanger your physical condition, and diminish the attractiveness of items. Building materials can be created using paper waste consisting of silica and magnesium, offering a sustainable alternative to traditional cement [8]. The interconnectedness lies in the correlation between the machinery employed, the products manufactured at a paper recycling facility, and the quantity of waste generated.…”

“…The quantity of sludge produced at the recycling paper mill is determined by the materials utilized and the products manufactured. [8]. In the creation of concrete for affordable housing projects, the leftover materials from making paper can serve as a cost-effective alternative to expensive materials.…”

Investigating the Feasibility of Using Concrete Containing Waste Paper Sludge Ash and Pozzolanic Materials to Repair Bridge Stub Columns

“…Te review of studies about waste paper sludge ash [24][25][26][27][28][29] shows that these materials can be used as a partial replacement for cement. Although waste paper sludge ash can improve the durability properties of concrete, it has little efect on improving the mechanical properties of concrete.…”