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Investigation of mechanical properties of mortar with mixed recycled aggregates

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Abstract

In this study two phases were considered. In the first phase, demolition of building materials such as concrete, brick, ceramic and tile, and stone were crushed and 30–40% stone, 10–20% ceramic, 5–15% brick, and 50–60% concrete waste were used to produce recycled sand. The initial properties of aggregates such as chemical properties, water absorption, moisture content, density, and abrasion were investigated. In the second phase, the mechanical properties of mortar with substitute of natural aggregates with recycled aggregates from 0 to 100% were examined. In addition, the sand to cement ratio was varied from 2, 2.5, and 3. The results showed that the compressive strength in sand to cement ratio of 3 is higher than other ratios. Water absorption test showed that the use of recycled sand increases the water absorption in all ratios of sand to cement. The flexural strength test showed that the use of 0–40% recycled sand in sand to cement ratio of 2.5 is higher than other specimens, but by increasing the waste to between 50 and 70%, specimens with sand to cement ratio of 3 have higher result. Increasing the recycled sand to 100%, produced higher results for sand to cement of 2. Additionally, backpropagation neural network was used to estimate the mechanical properties of mortar. With regression of up to 70% and mean standard error lower than 0.3, this network has good precision to predict the mortar properties.

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Authors and Affiliations

  1. Department of Civil Engineering, Shahrekord University, Shahrekord, Iran

    Ali Heidari, Masoumeh Hashempour, Hamed Javdanian & Mehdi Karimian

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  1. Ali Heidari
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  2. Masoumeh Hashempour
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  3. Hamed Javdanian
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  4. Mehdi Karimian
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Correspondence to Ali Heidari.

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Heidari, A., Hashempour, M., Javdanian, H. et al. Investigation of mechanical properties of mortar with mixed recycled aggregates. Asian J Civ Eng 19, 583–593 (2018). https://doi.org/10.1007/s42107-018-0044-1

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  • DOI: https://doi.org/10.1007/s42107-018-0044-1

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