Abstract
The main objective of this work is to study the mechanical characteristics and the chemical degradation of mortars and concretes made obtained by substituting the cement by the machining sludge. Several materials were carried out by substituting the cement with different amount of machining sludge (5, 10, 15 and 20%). The obtained materials are compared to those without substitution (ie: 00wt% of machining sludge). Mechanical and physical properties of the two materials (mortars and concretes) as flexural and compressive strengths were studied. Physical properties as shrinkage, the bloating effect, loss in mass, slump concretes and porosity were evaluated. In addition, chemical degradation is studied for the conservation of these concretes and mortars from machining sludge in different aggressive environment. Moreover, the addition of 5wt% of the machining sludge in the mixture of the mortar and the concretes seems to be interesting.
Highlights
The common term "machining sludge" includes several types of industrial waste coming from the mechanical industry: rectification sludge, and sludge from grinding, mass finishing, etc. [1]
To the figure 9, all mortars have a basic pH, which varies from 8,4 to 11. This pH increases according to the time and to the increase of the percentage of sludge in the mortars and stabilizes after 150 days. This alkalinity is due to a progressive and continuous salting out elements of chromium (Cr3+) and copper (Cu2+), present in the machining sludge, and which form with the water the alkaline bases
The main interest of this study is to evaluate the influence of the machining sludge in cement substitution on the mechanical and physico-chemical behavior of mortars and concretes
Summary
The common term "machining sludge" includes several types of industrial waste coming from the mechanical industry: rectification sludge, and sludge from grinding, mass finishing, etc. [1]. The common term "machining sludge" includes several types of industrial waste coming from the mechanical industry: rectification sludge, and sludge from grinding, mass finishing, etc. The mechanical industries produce some 50,000 tons of sludge. Aware of the enormous potential for recovery of this waste, the Carnot Cetim institute has valorised these muds in bricks [3,4]. For this purpose, the valorisation and management of industrial sludge are topical subjects; the valorization of waste (sludge) as alternative raw materials for the manufacture of ceramics has been studied by J.A. Junkes [5]
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