Abstract
The use of ceramic waste in concrete/mortar production as aggregate replacement or cement replacement has been under consideration in the last decade to find an effective way to tackle the growing hazard of ceramic waste disposal. In this study, the authors reutilize ceramic polishing waste (CPW) as a filler to replace an equal volume of cement paste in mortar while keeping the mixture proportions of the cement paste unchanged, i.e., in a new way as paste replacement. This mixture design strategy allows a larger amount of CPW to be added to substantially reduce the paste volume, cement and carbon footprint. The mortar mixes so produced had been subjected to carbonation and water absorption tests, and the results showed that as paste replacement, the CPW can significantly enhance the carbonation and water resistances, in addition to the environmental benefits of reducing waste, cement and carbon footprint. Regression analysis of test results indicated that for carbonation resistance, the cementing efficiency factor of the CPW was around 0.5, whereas for water resistance, the cementing efficiency factor was higher than 1.0 at low CPW content and lower than 1.0 at high CPW content.
Highlights
In 2019, waste recycling has once again become the focus of many heated discussions among environmentalists and politicians, not because the technology in this field has achieved major advancement, but because scandals have revealed that “recycled waste”in some developed countries has, in reality, ended up in poorly managed landfills in developing countries (Wang et al 2017; Harrabin and Edgington 2019; Wang et al 2020; Li et al 2021a)
The feasibility of adding ceramic polishing waste (CPW) as paste replacement in mortar to reduce waste disposal and cement consumption, and to improve durability has been studied by making a series of mortar mixes with different CPW
(1) The addition of up to 20% CPW to replace an equal volume of cement paste in mortar would reduce the paste volume and cement content by 33% without adversely affecting the performance of the mortar
Summary
In 2019, waste recycling has once again become the focus of many heated discussions among environmentalists and politicians, not because the technology in this field has achieved major advancement, but because scandals have revealed that “recycled waste”in some developed countries has, in reality, ended up in poorly managed landfills in developing countries (Wang et al 2017; Harrabin and Edgington 2019; Wang et al 2020; Li et al 2021a). The authors focus on carbonation and water resistances of mortar containing fine ceramic polishing waste (CPW) powder.
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