Abstract
In the marble industry, a lot of marble is wasted in the form of odd blocks of various sizes and slurry consisting of water and micro-fine particles. The slurry on drying converts into powder. Both slurry and powder have adverse effects on the environment. This research is focused on the gainful utilization of waste marble powder (WMP) by converting it into a valuable binding material. For this purpose, WMP and clay were collected, and their physical and chemical properties were determined. A mix of WMP and clay was prepared and burnt at a temperature around 1300 oC. The burnt mix was ground to powder form to get marble cement (MC). The MC was then used in mortar. The compressive and flexural strengths of mortar cubes and prisms were determined. Apart from this, X-ray diffraction (XRD) analysis, thermo-gravimetric analysis (TGA) and scanning electron microscopic (SEM) analysis were also carried out. The chemical composition showed that the MC has 52.5% di-calcium silicate (C2S) and 3.5% tri-calcium silicate (C3S).The compressive strength of MC mortar after 28 days curing is 6.03 MPa, which is higher than M1 mortar of building code of Pakistan (5 MPa). The compressive strength of MC mortar after one year is 20.67 MPa, which is only 17% less than OPC mortar.
Highlights
Marble stone has been used for construction and decoration purposes since a very long time [1]
Phase Composition The phase composition of marble cement and Ordinary Portland cement (OPC) powder were determined by X-ray diffraction analysis
In order to find the compressive strength of marble cement and OPC mortars, specimens prepared were removed from curing tank just before testing
Summary
Marble stone has been used for construction and decoration purposes since a very long time [1]. Khodabakhshian et al [19] substituted cement with waste marble powder up to a maximum of 20 percent in concrete They observed significant increase in the compressive and flexural strengths along with the modulus of elasticity of concrete, when cement is replaced with 5 % WMP. The inclusion of both waste marble dust and crushed bricks in cement significantly increased the compressive strength of mortar. Various techniques i.e., grain size analysis, X-ray diffraction (XRD), thermogravimatric analysis (TGA) and scanning electron microscopy (SEM) were used for the determination of different properties of marble cement (MC) powder and paste Mechanical properties such as compressive and flexural strengths of marble cement mortar were evaluated
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