Abstract
Waste foundry sand is the by-product of metal casting industry. Rice hull which is often burned after it is removed from rice is also a by-product of the agriculture industry. Disposing of these wastes leads to the environmental pollution. To optimal use of these wastes and avoid the adverse effects of dumping them, regular sand has been partially replaced with the waste foundry sand and rice hull ash pozzolan has been also used as a partial replacement for cement in making concrete. XRF, XRD and SEM experiments, compressive strength, tensile strength (Brazilian), flexural strength, modulus of elasticity and water absorption tests have been conducted. The results showed a slight decrease in compressive strength of samples in which regular sand was replaced with waste foundry sand by 15 percent; however, adding the rice hull ash to this mixture led to make a concrete comparable with control one. Also, using foundry sand in mix designs affects their physical performance. Moreover, the use of waste foundry sand in concrete is both economically and environmentally suitable.
Highlights
One of the methods for achieving of sustainable products is recycling and reusing of waste materials
Tensile strength test showed that partial replacement up to 70% cause an increase in tensile strength of the concrete containing waste foundry sand compared to the control sample
The chemical analysis test has been conducted through X-Ray Diffraction (XRD) method based on BS EN 13925-1 [15] which its results can be seen in the Fig. 3
Summary
One of the methods for achieving of sustainable products is recycling and reusing of waste materials. Guney et al [10] reported 13.8 and 24.8% reduction in the compressive strength in the replacement ratios of 5 and 15% respectively They concluded that the ultrafine particles of bentonite clay and finer particles of foundry sand increase the specific surface area of the particles, so these finer particles absorb the free water in the concrete paste. According to Saraswati et al [12], using foundry sand of 20, 40 and 60% instead of regular sand resulted in 16, 17.9 and 26.7% loss of tensile strength where water-cement ratio was 0.4% This tensile strength reduction is attributed to the ultrafine particles of Bentonite clay in the surface of foundry sand particles. The mechanical properties of the produced concrete measured and its microstructure is investigated
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