海岸带管理杂志

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Mechanical and Decontaminating Behaviour of Recycled Mortars With TiO2

A. Barbudo, A. Lozano-Lunar, E. Sanchez-Cabanillas, J. Ayuso and A.P. Galvin

The circular economy is an economic model of production and consumption, which involves sharing, leasing, reusing, repairing, refurbishing and recycling existing materials and products. The use of recycled materials in products with low mechanical requirements, especially those from construction and demolition waste (CDW), is a common practise in construction sector. In addition, the incorporation of photocatalysts (mainly nano-TiO2) in construction materials has emerged as a promising technology to develop products with special properties as air decontamination, self-cleaning and self-sterilizing ability under UV-Vis light irradiation. This research aims to study the decontamination power of recycled mortar with recycled fine aggregate from CDW. For this, two different series of mortars were produced. One series contained traditional Portland cement and the other one photocatalytic cement, which included TiO2. Both cements had the same requirements. Each series contained 4 mixtures with 4 different rates of replacing natural sand with mixed recycled sand (0%, 20%, 40% and 100%). 40x40x160 mm specimens were manufactured and were evaluated through mechanical strength (compressive and flexural strength), after 28 days. A sample of each mortar was sent to an external laboratory and analysed its photocatalytic power, following a standardised methodology. The results showed good mechanical behaviour despite the incorporation of recycled aggregate and a similar behaviour between mortars with photocatalytic cement.