Abstract
AbstractThe use of natural pozzolans in concrete applications is gaining more attention because of the associated environmental, economic, and technical benefits. In this study, reference cemented mine backfill samples were prepared using Portland cement, and experimental samples were prepared by partially replacing Portland cement with 10 or 20 wt.% fly ash as a byproduct (artificial) pozzolan or pumice as a natural pozzolan. Samples were cured for 7, 14, and 28 days to investigate uniaxial compressive strength development. Backfill samples containing 10 wt.% pumice had almost a similar compressive strength as reference samples. There is strong potential for pumice to be used in cemented backfill to minimize costs, improve backfill properties, and promote the sustainability of the mining industry.
Highlights
Pozzolans are siliceous or siliceous and aluminous materials that react with the calcium hydroxide (CaOH) released during cement hydration to produce compounds with cementing properties
Five treatments were tested (Table 2): reference samples made with 100% Portland cement; experimental samples made with Portland cement and 10 or 20 wt.% fly ash; and experimental samples made with Portland cement and 10 or 20 wt.% pumice
This investigation showed that there is a strong potential for the mining industry to exploit abundant natural pozzolans like pumice in backfilling operations
Summary
Pozzolans are siliceous or siliceous and aluminous materials that react with the calcium hydroxide (CaOH) released during cement hydration to produce compounds with cementing properties. Pozzolans are widely used in civil and mining applications to reduce costs and improve the mechanical and physical properties of concrete. Cement can account for up to 75% of mine backfill costs; it is common practice in the mining industry to partially replace relatively expensive cement with relatively inexpensive pozzolans (Edraki et al, 2014). Examples of artificial pozzolans are slag and fly ash, and examples of natural pozzolans are volcanic ash and the pumice formed during lava solidification. Saudi Arabia is fortunate to have a large resource of natural pozzolans, and research is ongoing to investigate their use in the concrete industry (Al-Amoudi et al, 2019; Celik et al, 2014; Kupwade-Patil et al, 2016; Moufti et al, 2000). Pumice was investigated for its potential use in mine backfill compared with fly ash and cement
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