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International Journal of Applied Engineering Research, ISSN 0973–4562, Volume 11, Number 4, (2016), pp 2680–2685 © Research India Publications. http://www.ripublication.com An Overview of Ceramic Wastes Management in Construction Sh. K. Amin* Assistant Professor, Chemical Engineering and Pilot Plant Department, Engineering Research Division, National Research Centre, Dokki, Giza, Egypt. H. A. Sibak Professor, Chemical Engineering Department, Faculty of Engineering, Cairo University, Giza, Egypt. S. A. El–Sherbiny Assistant Professor, Chemical Engineering Department, Faculty of Engineering, Cairo University, Giza, Egypt. M. F. Abadir Professor, Chemical Engineering Department, Faculty of Engineering, Cairo University, Giza, Egypt. Traditional construction materials such as concrete, bricks, hollow blocks, solid blocks, pavement blocks and tiles are being produced from the existing natural resources. This damages the environment due to continuous exploration and depletion of natural resources. Moreover, various toxic substances such as high concentration of carbon monoxide, oxides of sulfur, oxides of nitrogen, and suspended particulate matters are invariably emitted to the atmosphere during the manufacturing process of construction materials. The emission of toxic matters contaminates air, water, soil, flora, fauna and aquatic life, and thus influences human health as well as their living standard [2]. The cost of construction materials is increasing by the day because of high demand, scarcity of raw materials, and high price of energy. From the standpoint of energy saving and conservation of natural resources, the use of alternative constituents in construction materials is now a global concern. For this, the extensive research and development works towards exploring new ingredients are required for producing sustainable and environment friendly construction materials [2]. Abstract This article represents a comprehensive review of available literature on the construction materials including different kinds of ceramic wastes. The traditional methods for producing construction materials are using the valuable natural resources. Besides, the industrial and urban management systems are generating solid wastes, and most often dumping them in open fields. These activities pose serious detrimental effects on the environment. To safeguard the environment, many efforts are being made for the recycling of different types of solid wastes with a view to utilizing them in the production of various construction materials. This review article discusses the environmental implications caused by the generation of ceramic wastes, and highlights their recycling potentials and possible use for producing construction materials. Keywords: Ceramic wastes, Construction materials, Waste management. Introduction The industrial and economic growth witnessed in recent decades has brought with it an increase in the generation of different types of waste (urban, industrial, construction, etc.) despite the waste management policies which have been adopted nationally and internationally [1]. The practice of dumping and / or the inadequate management of waste from the various manufacturing sectors have had a notable impact on the receiving environment, leading to water, soil, air and noise pollution, amongst other complications, and adding to existing environmental problems. At the same time, these practices represent an economic cost [1]. However, if waste is managed correctly it can be converted into a resource which contributes to savings in raw materials, conservation of natural resources and the climate, and promotes sustainable development. Major Solid Wastes and Their Potential Use in Construction Materials Different types and sources of solid wastes are shown in Table (1). About 19 billion tons of solid wastes are expected to be generated annually by the year 2025 [3]. Annually, Asia alone generates 4.4 billion tons of solid wastes. About 6 % of this amount is generated in India [2–4]. Malaysia is expected to exceed 15,000 tons of solid wastes generation daily. The disposal of these wastes has become a major environmental problem in Malaysia and thus the possibility of recycling the solid wastes for use in construction materials is of increasing importance [2]. The recycling of solid wastes in civil engineering applications has undergone considerable development over a very long time. The utilization of fly ash, blast furnace slag, phosphor– 2680 International Journal of Applied Engineering Research, ISSN 0973–4562, Volume 11, Number 4, (2016), pp 2680–2685 © Research India Publications. http://www.ripublication.com gypsum, recycled aggregates, red mud, Kraft pulp production residue, waste tea, etc., in construction materials shows some examples of the success of research in this area. Similarly, the recycling of hazardous wastes for use in construction materials and the environmental impact of such practices has been studied for many years [2, 5]. The recycling and utilization potentials of different kinds of solid waste are shown in Table (1). In fact, there is a great scope for setting up secondary industries for the recycling and use of huge solid wastes in construction materials, as can be understood from Table (1). The uses of different types of solid waste in construction materials are shown in Table (2) [2, 6]. frequent and much higher in volume. In each category the fired ceramic waste was classified according to the production process. This classification is reported in the following diagram (Figure 1) [7, 8]. The ceramics industry is comprised of the following subsectors: wall and floor tiles, sanitary ware, bricks and roof tiles, refractory materials, technical ceramics and ceramic materials for domestic and ornamental use [8, 9]. Table 1: Different types and sources of solid wastes and their recycling and utilization potentials for construction materials Figure 1: Classification of ceramic wastes by type and production process Also, the ceramic waste is classified as non–hazardous industrial waste (NHIW). According to the Integrated National Plan on Waste 2008–2015, NHIW is all waste generated by industrial activity which is not classified as hazardous in Order MAM/304/2002, of the 8 th February, in accordance with the European List of Waste (ELW) and identified according to the following codes [1, 9]: Code No. 10 Waste from thermal processes. Waste from the manufacture of ceramic 10.12 products, bricks, roof tiles, and construction materials. Ceramic, brick, roof tile, and construction 10.12.08 materials waste (fired). Table 2: Major solid wastes and their uses in the production of construction materials Recent Developments in Ceramic Waste Reuse 1. Utilization of Ceramic Wastes in the Manufacturing of Ceramic Tiles There have been numerous attempts to utilize ceramic wastes in the manufacture of wall and floor ceramic tiles in the last two decades. The industrial wastes are important part of them. Cement kiln dust (CKD) as a great trouble maker waste, was utilized in ceramic tile bodies by Youssef [10] to replace half the feldspar required for ceramic wall tile body with the double target of cost reduction and environment protection. Samples were dry pressed then fired at 1125 °C for 5, 10, 15 minutes soaking time respectively. Vitrification parameters of the fired samples were measured. The water absorption was within both ISO and Egyptian standards limits of wall tiles. CKD in the mixture makes it less dense, more porous and lowers the compressive strength. The dielectric properties get better, while all the investigated mixtures showed good electrical insulators behavior. Ceramic Wastes Ceramic wastes are produced as a result of the ceramic processing. These wastes cause soil, air, and groundwater pollution. Ceramic wastes can be separated in two categories in accordance with the source of raw materials. The first one are all fired wastes generated by the structural ceramic factories that use only red pastes to manufacture their products, such as brick, blocks, and roof tiles. The second one is all fired waste produced in stoneware ceramic such as wall, floor tiles and sanitary ware. These producers use red and white pastes; nevertheless, the usage of white paste is more 2681 International Journal of Applied Engineering Research, ISSN 0973–4562, Volume 11, Number 4, (2016), pp 2680–2685 © Research India Publications. http://www.ripublication.com Amin et al. [11] utilized the fired clay brick waste (Homra) in the production of ceramic tiles. The fine red powder was used to replace part of the basic mixture in percentage of weight starting from 0 % till 70 %, increasing by 10 %. Firing shrinkage and vitrification parameters were determined and compared to both Egyptian and ISO standards. Analysis of variance carried on crushing strength data, showed that the percent replacement was the most influential factor rather than temperature or soaking time. Results of water absorption, crushing strength, MOR, thermal chock resistance, chemicals and staining resistance, hardness conformed to standards. The 20 % fired clay waste addition is recommended for both its economical and environmental benefits, in addition to improving tile quality. The influence of a mixture of leached cement kiln dust waste (LCD) and Homra (H) on the densification and thermomechanical properties of conventional ceramic body has also been studied. The results showed that as the firing temperature increases, the densification and mechanical properties were enhanced up to 10 wt. % LCD content at all firing temperatures, deteriorating at higher LCD contents. Samples with high porosity showed a greater dimensional stability and therefore could be used as wall tiles, whilst those with low porosity can be used as floor tiles. The optimum body batch was that containing 10 wt. % LCD and 5 wt. % H fired at 1150 °C [12]. El–Fadaly et al. [13] investigated the possibility of recycling of some solid wastes obtained during the preparation of ceramic tiles within the same factory. The results showed that it is possible to use cyclone dust, fly dust, and sludge in the preparation of ceramic tiles at the same factory. The physico– mechanical properties were enhanced by the addition of cyclone dust and deteriorated by the addition of sludge although still being within the acceptable range of such products. On the other hand, properties of the product were nearly unaffected by the addition of filter dust. The best properties were achieved at 7.5 % wt content of each waste. Also, Ceramic glazing sludge deriving from the purification process of waste–water obtained by the glazing tile phase was mixed in equal proportion with glass cullet in order to obtain a high sintered product suitable to be used as floor / wall covering tiles. Products were obtained with energy saving due a lowering of about 200°C compared to about 1200 °C for floor / wall covering [14]. Youssef and Ghazal [15] investigated the possibility of adding the fine waste resulting from grinding of kiln rollers without any treatment to standard floor tiles composition. It was proved that adding up to 10 % powder to ceramic floor tiles standard mix did not alter its final properties. Also, this waste was utilized by Roushdy et al. [16] in the manufacture of ceramic wall tiles. It was found that it adding this waste at 1 or 2 % level to wall tiles bodies improved their properties. Youssef et al. [17] utilized soda glass waste (cullet) in tile industry to reduce the firing temperature and time of the tile bodies due to easy melting and glassy phase formation. They recommended the addition of soda glass at a level of 23 % by weight and firing at 1100 °C for 1 h to obtain water absorption of 6.9 % for glazed floor tiles and 33.3 % by weight and firing at 1100 °C for 1 h to get 5.6 % water absorption for nonglazed floor tiles. These results were recently corroborated by Mustafi et al. [18] who investigated the effect of adding cullet on the properties of ceramic tiles. They used cullet as partial or total replacement of feldspar. Their results also indicated an increase in firing shrinkage and in the rate of densification coupled with a decrease in apparent porosity. Sintered ceramics from paper mill sludge and glass cullet were produced and characterized by Asquini et al. [19]. Some sintered samples displayed fairly good physical and mechanical properties as a consequence of their low residual porosity and fine microstructure. Also, Maschio et al. [20] and Furlani et al. [21, 22] studied recycling of either paper mill sludge or steel slag with glass cullet from energy saving lamps in the manufacturing of fast firing ceramic tiles. It is observed that the composition containing 60 wt. % of paper mill sludge or steel slag, and 40 wt. % of glass cullet displayed the best overall behaviour. A lot of research work has been carried on the properties of red slurries produced as waste in the industrial production of aluminum from bauxite ores using the Bayer process. Red mud, as pigment, was used in the manufacture of unglazed stoneware tiles by Bittner et al. [23] by fast firing technique. It was found however that red mud is not suitable as a pigment due to the colour shift to brown with strong bloating of tiles. Also, Red mud was utilized as an additive to Egyptian raw materials for ceramic tile production. The results obtained have shown that it is possible to use red mud in an elevated percentage (70 %) with a blend of Egyptian clays, potash feldspar and silica [24]. On the other hand, the literature involving the use of silica fume in the manufacture of ceramic tiles is very limited. Youssef et al. [25] tried unsuccessfully to utilize silica fume to impart faster mullitization in ceramic tiles. It was found that silica fume transforms to cristobalite at about 1000 °C followed by rapid grain growth which impeded the formation of mullite. This resulted in a drop in bending strength upon addition of silica fume. 2. Utilization of Ceramic Wastes in the Manufacturing of Clay Bricks Recycling of different ceramic wastes in the production of fired clay bricks (building bricks) was widely investigated. During production, especially in the firing, transportation and construction steps, large amounts of bricks are broken and have to be dumped in landfills or used as a filling material. Demirr and Orhan [26] investigated the addition of waste brick material in brick production. Their results show that at a mass of 30 % fine waste material additive, fired at 900 °C showed adequate strength. On the other hand, Ceramic tiles industry produces a lot of wastes such as ceramic sludge, broken under quality tiles, and accumulated dust. These wastes constitute a great pollution problem to the surrounding environment. Up to 50 % ceramic sludge additives were mixed with Kom Osheem clayey raw material in upper Egypt for making building bricks. The mix containing 15 % sludge and 85 % clay showed suitable physico–mechanical properties for the fired clay bricks [27, 28]. Menezes et al. [29] utilized the kaolin processing and granite sawing wastes as alternative raw materials in the production of ceramic construction materials (as ceramic bricks and tiles, 2682 International Journal of Applied Engineering Research, ISSN 0973–4562, Volume 11, Number 4, (2016), pp 2680–2685 © Research India Publications. http://www.ripublication.com Ay and Unal [40], and Lavat et al. [41] conducted researches on partial substitution of cement with ceramic roofing tiles waste. Substitution with various weight ratios by percentage (25 % up to 40 %) of Portland cement by waste tile, and optimized weight ratio substitution. Their main interest was on: (i) pozzolanic properties of waste tile, (ii) setting time, (iii) particle size, (iv) specific surface area, (v) volume stability, (vi) density, and (vii) strength of cement. Their findings indicated that waste roofing tiles have pozzolanic properties, while also showing chemical and physical properties similar to cement, thus conforming to cement standard. Puertas et al. [42] did an interesting research on clinkers and cements obtained from a raw mix containing ceramic waste as a raw material. The hydration, physical–chemical properties and leaching behavior in different acid media were investigated and found to be morphologically and compositionally similar in hydration behavior, when compared to conventional cement. The investigation was conducted using red ceramic wall tiles, white ceramic wall tiles, and a combination of red and white ceramic wall tiles, and optimized at 11–14 % substitution of raw materials for making cement. As long as the European and Egyptian standards allows blending with burnt shale, from 21 up to 35 wt. % known as CEM II / B–T, Sadek et al. [43] used the fired ceramic wall tiles waste rejected in industry to partially replace cement, up to this ratio (35 wt.%), due to compatibility of raw materials, insuring its conformity to standards to save energy required for clinker production, materials to cement manufacturing and to fulfill both environmental and economical targets. Calcined clay waste, from Spanish paper industry, in the form of slurry with 29 % organic materials, was also utilized in blended cements [44]. Naceri and Hamina [45] investigated the use of waste brick as a partial replacement for cement in the production of cement mortar. Clinker was replaced by waste brick in different proportions (up to 20 % by weight) for cement. The results obtained show that the substitution of cement by 10% artificial pozzolana improves the grinding time and setting times of the cement, thus the mechanical characteristics of mortar. In a distinguished work about utilizing the polishing and glazing ceramic wastes, produced as sludge, in Italian factories, Andreola et al. [46] successfully utilized them as a partial replacement of cement (CEM I 52.5) up to 25 %, with some important differences in their behavior. New blended cements containing 10 % and 20 % ceramic sanitary ware (SW), and construction and demolition waste (C&DW) were investigated. The results showed that the addition of ceramic sanitary ware waste reduced shear yield stress and retarded the hydration reactions [47]. roof tiles, mortars, etc.). They showed that correct characterization, both physically and micro–structurally, and application of mathematical tools permit incorporation of high amounts of waste in ceramic formulations, exceeding 50 % of the raw material used in the composition. Also, Many investigations were carried out to recycling by– pass cement dust in alternative processes (e.g. use it in the production of cement, clay bricks, or as a fertilizer by mixing it with sewage water). The suitability of the mixture of by– pass cement dust as non plastic material and the clay for the production of bricks has been tested by many authors. Their results generally showed that the substitution of 10 wt. % clay by cement dust increases the gas permeability of the fired bricks, which prevents bloating, and increases the crushing strength of bricks with firing temperature up to 1000 C. Higher level of substitution brought however a decrease in crushing strength [30–32]. 3. Utilization of Ceramic Wastes in the Manufacturing of Vitrified Clay Pipes Vitrified clay sewer pipes are used for sanitary drainage due to their corrosion and abrasion resistance. They are manufactured by mixing clay, grog and feldspar as fluxing agent. In this section, the reusing ceramic wastes in the manufacture of vitrified sewer pipes were investigated. Waste by–pass cement dust was added in different percentages ranging from 2 % to 10 % to a standard mix for sewer pipes manufacture, as a substitute for expensive feldspar. It was found that a mix consisting of 45 % kaolin, 36 % ball clay, 9 % grog, and 10 % by–pass dust fired at 1300 °C for 4 hours yielded samples that meet the standards [33]. Also, ground glass waste (cullet) was added to clay and grog mixture to substitute expensive feldspar. Samples with different percent glass addition were fired for 3 hours at 1050, 1150 and 1250 °C. It was found that 10 % glass addition to samples yielded samples that meet standard requirements when fired at 1050 °C for 3 hours corresponding to a reduction of about 200 °C in firing temperature. This in turns leads to savings in fuel and reduction in CO2 emissions [34]. 4. Utilization of Ceramic Wastes in the Manufacturing of Blended Cement Utilization of both fired red and white ceramic wastes and their combination as a substitute of raw materials in the manufacture of clinker itself was investigated. The results showed that they were technically viable, and have higher reactivity and burnability than a conventional mix, providing that the particle size of the waste used is lower than 90 µm [35]. Broken glass and ceramics are considered as non– hazardous waste that can be also utilized [6]. The recycling practice has been adopted in Europe by enforcing specific standards that allow the use of waste (fly–ashes, blast furnace slag, silica fume (SiO2)), respectively, in blended cements, according to BS EN 197–1 [36]. Recently, Egyptian Standards of cement have been modified to abide with European Standards [37]. The potential utilization of coloured glass cullet in various cementitious products was found to be very encouraging especially for decorative and architectural applications [38, 39] Conclusion From the previous expose, it is clear that ceramic wastes can be classified as non–hazardous industrial waste (NHIW). Ceramic wastes include electrical porcelain insulator residues, white ceramic, sanitary porcelain ware, roof tiles, cement kiln dust, fired clay brick waste (Homra), glass waste (cullet), 2683 International Journal of Applied Engineering Research, ISSN 0973–4562, Volume 11, Number 4, (2016), pp 2680–2685 © Research India Publications. http://www.ripublication.com ceramic sludge, ceramic broken under quality tiles, and the accumulated ceramic dust. Ceramic wastes were generally suitable for use in the construction industry, such as ceramic wall and floor tiles, vitrified sewer pipes, building bricks and blended cement. 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