Performance Evaluation of Cementitious Composites Containing Granulated Rubber Wastes, Silica Fume, and Blast Furnace Slag

Maléki Tagba,Chuanqi Liu,Xu Gao,Mohamed Larbi Benmalek,Mingjie Jiang,Salima Boukour,Shujin Li

doi:10.3390/cryst11060632

Maléki Tagba, Chuanqi Liu + Show 5 more

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https://doi.org/10.3390/cryst11060632

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Abstract

In this study, rubberized cementitious materials are produced with recycled rubber waste as an alternative to fine aggregate. Mixtures with different additions to rubber wastes (RW), silica fume (SF), and blast furnace slag (BFS) have been designed and characterized. Hardened properties including compressive and bond strength, shrinkage, water-accessible porosity, rapid chloride migration, and microstructure were investigated. The results show that the addition of SF and BFS improves the performances of rubberized mortars and reduces shrinkage. The incorporation of 5% RW with 20% BFS increases compressive strength and reduces water-accessible porosity. Ion chloride resistance was enhanced by a combination of 15% RW, 8% SF, and 20% BFS. The addition of SF and BFS as cement replacement improves the performance of mortars due to their filling effect and a pozzolanic reaction, which has been verified by a microstructural analysis.

Highlights

Energy conservation and reduction of carbon emissions have become critical in the world [1], and it is well known that 8 to 10% of global CO2 emissions are produced by the cement industry, which is seen as one of the leading causes of climate change [2]
This study aimed to investigate the effect of mineral additives such as silica fume and blast furnace slag, on the physical-mechanical, durability, and microstructural properties of rubberized mortar
Replacing 8% of cement by silica fume (SF) increased the compressive strength of the 5RW mix by 8.30% and 18.43% for 7 and 28 days, respectively, while replacing 20% of cement by blast furnace slag (BFS) increased the compressive strength of the same mix by 15.58% and 21.32% for 7 and 28 days

Summary

Introduction

Energy conservation and reduction of carbon emissions have become critical in the world [1], and it is well known that 8 to 10% of global CO2 emissions are produced by the cement industry, which is seen as one of the leading causes of climate change [2]. The extraction, processing, and transport of vast quantities of aggregates, together with raw materials required each year for cement production, consumes a considerable amount of energy and harms the ecology of the planet [3]. Faced with the growing demand for material resources and the need to preserve the environment, it is necessary to explore and study possibilities for the re-use and recovery of waste and industrial by-products, especially in the field of civil engineering [4]

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