The Experts below are selected from a list of 4035 Experts worldwide ranked by ideXlab platform

Raffaele Cioffi - One of the best experts on this subject based on the ideXlab platform.

  • Cold Bonding process for treatment and reuse of waste materials technical designs and applications of pelletized products
    Critical Reviews in Environmental Science and Technology, 2021
    Co-Authors: Alberto Ferraro, Francesco Colangelo, Raffaele Cioffi, Ilenia Farina, Marco Race, C R Cheeseman, Massimiliano Fabbricino
    Abstract:

    This work provides a comprehensive review of research on the Cold-Bonding pelletization process used to produce lightweight aggregates (LWAs) using waste materials, to valorize the waste and, at th...

  • recycling of non metallic automotive shredder residues and coal fly ash in Cold bonded aggregates for sustainable concrete
    Composites Part B-engineering, 2017
    Co-Authors: Francesco Colangelo, Francesco Messina, L Di Palma, Raffaele Cioffi
    Abstract:

    Abstract In order to achieve the relevant objectives of EC directive on end-of-life of vehicles (2000/53/CE), innovative solutions such as recycling automotive shredder residues are required. This paper deals with the design and characterization of concrete mixtures containing artificial aggregates obtained through the Cold-Bonding pelletization of non-metallic fraction of automotive shredder residues, commonly named car fluff. In this work, car fluff was pelletized with blended cementitious mixtures containing coal fly ash, another industrial by-product. Produced artificial aggregates were characterized by determining main environmental, physical and mechanical properties. Then, they were employed as lightweight aggregates for manufacture of sustainable concrete. Experimental results showed good mechanical properties of concrete containing these aggregates and leaching behaviour of hardened specimens confirmed the environmental effectiveness of the here studied car fluff recovery process.

  • recycling of mswi fly ash by means of cementitious double step Cold Bonding pelletization technological assessment for the production of lightweight artificial aggregates
    Journal of Hazardous Materials, 2015
    Co-Authors: Francesco Colangelo, Francesco Messina, Raffaele Cioffi
    Abstract:

    Abstract In this work, an extensive study on the recycling of municipal solid waste incinerator fly ash by means of Cold Bonding pelletization is presented. The ash comes from an incineration plant equipped with rotary and stoker furnaces, in which municipal, hospital and industrial wastes are treated. Fly ash from waste incineration is classified as hazardous and cannot be utilized or even landfilled without prior treatment. The pelletization process uses cement, lime and coal fly ash as components of the binding systems. This process has been applied to several mixes in which the ash content has been varied from 50% (wt.%) up to a maximum of 70%. An innovative additional pelletization step with only cementitious binder has been performed in order to achieve satisfactory immobilization levels. The obtained lightweight porous aggregates are mostly suitable for recovery in the field of building materials with enhanced sustainability properties. Density, water absorption and crushing strength ranged from 1000 to 1600 kg/m3, 7 to 16% and 1.3 to 6.2 MPa, respectively, and the second pelletization step increased stabilization efficiency. The feasibility of the process has been analyzed by testing also concrete specimens containing the artificial aggregates, resulting in lightweight concrete of average performance.

  • use of cement kiln dust blast furnace slag and marble sludge in the manufacture of sustainable artificial aggregates by means of Cold Bonding pelletization
    Materials, 2013
    Co-Authors: Francesco Colangelo, Raffaele Cioffi
    Abstract:

    In this work, three different samples of solid industrial wastes cement kiln dust (CKD), granulated blast furnace slag and marble sludge were employed in a Cold Bonding pelletization process for the sustainable production of artificial aggregates. The activating action of CKD components on the hydraulic behavior of the slag was explored by evaluating the neo-formed phases present in several hydrated pastes. Particularly, the influence of free CaO and sulfates amount in the two CKD samples on slag reactivity was evaluated. Cold bonded artificial aggregates were characterized by determining physical and mechanical properties of two selected size fractions of the granules for each studied mixture. Eighteen types of granules were employed in C28/35 concrete manufacture where coarser natural aggregate were substituted with the artificial ones. Finally, lightweight concretes were obtained, proving the suitability of the Cold Bonding pelletization process in artificial aggregate sustainable production.

  • use of cement kiln dust blast furnace slag and marble sludge in the manufacture of sustainable artificial aggregates by means of Cold Bonding pelletization
    Materials, 2013
    Co-Authors: Francesco Colangelo, Raffaele Cioffi
    Abstract:

    In this work, three different samples of solid industrial wastes cement kiln dust (CKD), granulated blast furnace slag and marble sludge were employed in a Cold Bonding pelletization process for the sustainable production of artificial aggregates. The activating action of CKD components on the hydraulic behavior of the slag was explored by evaluating the neo-formed phases present in several hydrated pastes. Particularly, the influence of free CaO and sulfates amount in the two CKD samples on slag reactivity was evaluated. Cold bonded artificial aggregates were characterized by determining physical and mechanical properties of two selected size fractions of the granules for each studied mixture. Eighteen types of granules were employed in C28/35 concrete manufacture where coarser natural aggregate were substituted with the artificial ones. Finally, lightweight concretes were obtained, proving the suitability of the Cold Bonding pelletization process in artificial aggregate sustainable production.

Francesco Colangelo - One of the best experts on this subject based on the ideXlab platform.

  • Cold Bonding process for treatment and reuse of waste materials technical designs and applications of pelletized products
    Critical Reviews in Environmental Science and Technology, 2021
    Co-Authors: Alberto Ferraro, Francesco Colangelo, Raffaele Cioffi, Ilenia Farina, Marco Race, C R Cheeseman, Massimiliano Fabbricino
    Abstract:

    This work provides a comprehensive review of research on the Cold-Bonding pelletization process used to produce lightweight aggregates (LWAs) using waste materials, to valorize the waste and, at th...

  • recycling of non metallic automotive shredder residues and coal fly ash in Cold bonded aggregates for sustainable concrete
    Composites Part B-engineering, 2017
    Co-Authors: Francesco Colangelo, Francesco Messina, L Di Palma, Raffaele Cioffi
    Abstract:

    Abstract In order to achieve the relevant objectives of EC directive on end-of-life of vehicles (2000/53/CE), innovative solutions such as recycling automotive shredder residues are required. This paper deals with the design and characterization of concrete mixtures containing artificial aggregates obtained through the Cold-Bonding pelletization of non-metallic fraction of automotive shredder residues, commonly named car fluff. In this work, car fluff was pelletized with blended cementitious mixtures containing coal fly ash, another industrial by-product. Produced artificial aggregates were characterized by determining main environmental, physical and mechanical properties. Then, they were employed as lightweight aggregates for manufacture of sustainable concrete. Experimental results showed good mechanical properties of concrete containing these aggregates and leaching behaviour of hardened specimens confirmed the environmental effectiveness of the here studied car fluff recovery process.

  • recycling of mswi fly ash by means of cementitious double step Cold Bonding pelletization technological assessment for the production of lightweight artificial aggregates
    Journal of Hazardous Materials, 2015
    Co-Authors: Francesco Colangelo, Francesco Messina, Raffaele Cioffi
    Abstract:

    Abstract In this work, an extensive study on the recycling of municipal solid waste incinerator fly ash by means of Cold Bonding pelletization is presented. The ash comes from an incineration plant equipped with rotary and stoker furnaces, in which municipal, hospital and industrial wastes are treated. Fly ash from waste incineration is classified as hazardous and cannot be utilized or even landfilled without prior treatment. The pelletization process uses cement, lime and coal fly ash as components of the binding systems. This process has been applied to several mixes in which the ash content has been varied from 50% (wt.%) up to a maximum of 70%. An innovative additional pelletization step with only cementitious binder has been performed in order to achieve satisfactory immobilization levels. The obtained lightweight porous aggregates are mostly suitable for recovery in the field of building materials with enhanced sustainability properties. Density, water absorption and crushing strength ranged from 1000 to 1600 kg/m3, 7 to 16% and 1.3 to 6.2 MPa, respectively, and the second pelletization step increased stabilization efficiency. The feasibility of the process has been analyzed by testing also concrete specimens containing the artificial aggregates, resulting in lightweight concrete of average performance.

  • use of cement kiln dust blast furnace slag and marble sludge in the manufacture of sustainable artificial aggregates by means of Cold Bonding pelletization
    Materials, 2013
    Co-Authors: Francesco Colangelo, Raffaele Cioffi
    Abstract:

    In this work, three different samples of solid industrial wastes cement kiln dust (CKD), granulated blast furnace slag and marble sludge were employed in a Cold Bonding pelletization process for the sustainable production of artificial aggregates. The activating action of CKD components on the hydraulic behavior of the slag was explored by evaluating the neo-formed phases present in several hydrated pastes. Particularly, the influence of free CaO and sulfates amount in the two CKD samples on slag reactivity was evaluated. Cold bonded artificial aggregates were characterized by determining physical and mechanical properties of two selected size fractions of the granules for each studied mixture. Eighteen types of granules were employed in C28/35 concrete manufacture where coarser natural aggregate were substituted with the artificial ones. Finally, lightweight concretes were obtained, proving the suitability of the Cold Bonding pelletization process in artificial aggregate sustainable production.

  • use of cement kiln dust blast furnace slag and marble sludge in the manufacture of sustainable artificial aggregates by means of Cold Bonding pelletization
    Materials, 2013
    Co-Authors: Francesco Colangelo, Raffaele Cioffi
    Abstract:

    In this work, three different samples of solid industrial wastes cement kiln dust (CKD), granulated blast furnace slag and marble sludge were employed in a Cold Bonding pelletization process for the sustainable production of artificial aggregates. The activating action of CKD components on the hydraulic behavior of the slag was explored by evaluating the neo-formed phases present in several hydrated pastes. Particularly, the influence of free CaO and sulfates amount in the two CKD samples on slag reactivity was evaluated. Cold bonded artificial aggregates were characterized by determining physical and mechanical properties of two selected size fractions of the granules for each studied mixture. Eighteen types of granules were employed in C28/35 concrete manufacture where coarser natural aggregate were substituted with the artificial ones. Finally, lightweight concretes were obtained, proving the suitability of the Cold Bonding pelletization process in artificial aggregate sustainable production.

Kasim Mermerdas - One of the best experts on this subject based on the ideXlab platform.

  • influence of artificial aggregate on mechanical properties fracture parameters and bond strength of concretes
    Construction and Building Materials, 2020
    Co-Authors: Suleyman Ipek, Olabode Adekunle Ayodele, Kasim Mermerdas
    Abstract:

    Abstract The paper presented herein investigates the mechanical performance of concrete involving lightweight and normal weight aggregates with similar compressive strength. For this, two compressive strength values, 25 and 45 MPa, were considered for the concretes produced by normal and lightweight aggregates. Therefore, four concrete mixtures were designed at different water-to-cement ratios and cement contents. The lightweight aggregate utilized in this study was produced through Cold Bonding pelletization of fly ash and cement at ambient temperature in a specially designed tilted pan. The artificial lightweight aggregate used as a substitution of natural aggregate had similar particle size distribution to that of natural aggregate. The same mixing procedure was adopted to produce concrete and the testing specimens attained from each mixture were cured at the same circumstances. After the 28-day curing period, the specimens were tested for compressive strength and modulus of elasticity, splitting tensile and flexural strengths. Moreover, advanced mechanical properties such as fracture parameters, bond strength between embedded reinforcement and the concrete were also investigated. The test results indicated that it is possible to produce the lightweight aggregate concrete having similar compressive strength with the natural aggregate concrete, however, the utilization of artificial lightweight aggregates significantly influenced the investigated mechanical and fracture properties of the concretes despite having the similar compressive strengths. But, it was also observed that the utilization of lightweight aggregate made the concrete more ductile.

  • recycling ground granulated blast furnace slag as Cold bonded artificial aggregate partially used in self compacting concrete
    Journal of Hazardous Materials, 2012
    Co-Authors: Mehmet Gesoglu, Erhan Guneyisi, Swara Fuad Mahmood, Kasim Mermerdas
    Abstract:

    Ground granulated blast furnace slag (GGBFS), a by-product from iron industry, was recycled as artificial coarse aggregate through Cold Bonding pelletization process. The artificial slag aggregates (ASA) replaced partially the natural coarse aggregates in production of self-compacting concrete (SCC). Moreover, as being one of the most widely used mineral admixtures in concrete industry, fly ash (FA) was incorporated as a part of total binder content to impart desired fluidity to SCCs. A total of six concrete mixtures having various ASA replacement levels (0%, 20%, 40%, 60%, and 100%) were designed with a water-to-binder (w/b) ratio of 0.32. Fresh properties of self-compacting concretes (SCC) were observed through slump flow time, flow diameter, V-funnel flow time, and L-box filling height ratio. Compressive strength of hardened SCCs was also determined at 28 days of curing. It was observed that increasing the replacement level of ASA resulted in decrease in the amount of superplasticizer to achieve a constant slump flow diameter. Moreover, passing ability and viscosity of SCC's enhanced with increasing the amount of ASA in the concrete. The maximum compressive strength was achieved for the SCC having 60% ASA replacement.

Mehmet Gesoglu - One of the best experts on this subject based on the ideXlab platform.

  • influence of the artificial lightweight aggregate on fresh properties and compressive strength of the self compacting mortars
    Construction and Building Materials, 2016
    Co-Authors: Erhan Guneyisi, Mehmet Gesoglu, Suleyman Ipek, Hussein Ghanim, Ihsan Taha
    Abstract:

    Abstract The current study experimentally investigated the effect of the artificial lightweight aggregate and the water-to-binder ratio on the initial and final setting times of self-compacting mortars. The artificial lightweight aggregates used in this study were manufactured through Cold Bonding pelletization of 90% of class-F fly ash and 10% of Portland cement in a tilted pan with an ambient temperature and moisture content. The self-compacting mortars were designed at four binder contents of 540 kg/m 3 , 520 kg/m 3 , 500 kg/m 3 , and 480 kg/m 3 at four different water-to-binder ratios of 0.33, 0.37, 0.40, and 0.44, respectively. In each water-to-binder ratio, the natural aggregate was substituted with the artificial lightweight aggregate at the replacement levels of 0%, 20%, 40%, and 60%. Totally 16 self-compacting mortar mixtures were designed and produced. Slump flow diameter, V-funnel flow time and initial and final setting times were experimentally investigated as fresh properties while the compressive strength of the mortar mixtures were measured at 5 different ages of 3-day, 7-day, 28-day, 56-day, and 90-day. Test results showed that both initial and final setting times of the self-compacting mortars were significantly affected by the water-to-binder ratio. Addition to setting times, the slump flow diameter and V-funnel flow time was influenced by both the water-to-binder ratio and the artificial lightweight aggregate content. Moreover, the compressive strength results indicated that increasing the artificial lightweight aggregate content systematically decreased the compressive strength of the mortar mixtures at aforementioned testing ages whereas decreasing the water-to-binder ratio increased the compressive strength.

  • recycling ground granulated blast furnace slag as Cold bonded artificial aggregate partially used in self compacting concrete
    Journal of Hazardous Materials, 2012
    Co-Authors: Mehmet Gesoglu, Erhan Guneyisi, Swara Fuad Mahmood, Kasim Mermerdas
    Abstract:

    Ground granulated blast furnace slag (GGBFS), a by-product from iron industry, was recycled as artificial coarse aggregate through Cold Bonding pelletization process. The artificial slag aggregates (ASA) replaced partially the natural coarse aggregates in production of self-compacting concrete (SCC). Moreover, as being one of the most widely used mineral admixtures in concrete industry, fly ash (FA) was incorporated as a part of total binder content to impart desired fluidity to SCCs. A total of six concrete mixtures having various ASA replacement levels (0%, 20%, 40%, 60%, and 100%) were designed with a water-to-binder (w/b) ratio of 0.32. Fresh properties of self-compacting concretes (SCC) were observed through slump flow time, flow diameter, V-funnel flow time, and L-box filling height ratio. Compressive strength of hardened SCCs was also determined at 28 days of curing. It was observed that increasing the replacement level of ASA resulted in decrease in the amount of superplasticizer to achieve a constant slump flow diameter. Moreover, passing ability and viscosity of SCC's enhanced with increasing the amount of ASA in the concrete. The maximum compressive strength was achieved for the SCC having 60% ASA replacement.

  • properties of lightweight aggregates produced with Cold Bonding pelletization of fly ash and ground granulated blast furnace slag
    Materials and Structures, 2012
    Co-Authors: Mehmet Gesoglu, Erhan Guneyisi, Hatice Oznur Oz
    Abstract:

    Pelletization is a worldwide process used in producing artificial aggregates although its usage is not common in Turkey. In this study, lightweight aggregates (LWAs) were manufactured through Cold-Bonding pelletization of ground granulated blast furnace slag (G) and two types of fly ash with different finenesses (Fly ash A and B). Ordinary Portland cement (PC) was used as a binder at varying amounts from 5 to 20 % by weight. A total of 20 Cold-bonded lightweight aggregates were produced at room temperature with different combinations of PC, FA and/or G. The hardened aggregates were tested for specific gravity, water absorption, and crushing strength. Thereafter, lightweight concretes (LWCs) were produced with water to cement ratio of 0.50 and a cement content of 400 kg/m3 by using such lightweight aggregates. The hardened concretes were tested for compressive strength at 28 and 56 days to explore the effect of aggregate types on the compressive strength development. Test results revealed that the amount of cement content had a significant effect on the strength of LWAs which in turn governed the variation in compressive strength of the LWCs. The highest 28 and 56-day compressive strengths of 43 and 51 MPa, respectively were achieved for the concretes including LWAs produced from the blend of 40 % slag, 40 % FA-A and 20 % PC.

Erhan Guneyisi - One of the best experts on this subject based on the ideXlab platform.

  • influence of the artificial lightweight aggregate on fresh properties and compressive strength of the self compacting mortars
    Construction and Building Materials, 2016
    Co-Authors: Erhan Guneyisi, Mehmet Gesoglu, Suleyman Ipek, Hussein Ghanim, Ihsan Taha
    Abstract:

    Abstract The current study experimentally investigated the effect of the artificial lightweight aggregate and the water-to-binder ratio on the initial and final setting times of self-compacting mortars. The artificial lightweight aggregates used in this study were manufactured through Cold Bonding pelletization of 90% of class-F fly ash and 10% of Portland cement in a tilted pan with an ambient temperature and moisture content. The self-compacting mortars were designed at four binder contents of 540 kg/m 3 , 520 kg/m 3 , 500 kg/m 3 , and 480 kg/m 3 at four different water-to-binder ratios of 0.33, 0.37, 0.40, and 0.44, respectively. In each water-to-binder ratio, the natural aggregate was substituted with the artificial lightweight aggregate at the replacement levels of 0%, 20%, 40%, and 60%. Totally 16 self-compacting mortar mixtures were designed and produced. Slump flow diameter, V-funnel flow time and initial and final setting times were experimentally investigated as fresh properties while the compressive strength of the mortar mixtures were measured at 5 different ages of 3-day, 7-day, 28-day, 56-day, and 90-day. Test results showed that both initial and final setting times of the self-compacting mortars were significantly affected by the water-to-binder ratio. Addition to setting times, the slump flow diameter and V-funnel flow time was influenced by both the water-to-binder ratio and the artificial lightweight aggregate content. Moreover, the compressive strength results indicated that increasing the artificial lightweight aggregate content systematically decreased the compressive strength of the mortar mixtures at aforementioned testing ages whereas decreasing the water-to-binder ratio increased the compressive strength.

  • recycling ground granulated blast furnace slag as Cold bonded artificial aggregate partially used in self compacting concrete
    Journal of Hazardous Materials, 2012
    Co-Authors: Mehmet Gesoglu, Erhan Guneyisi, Swara Fuad Mahmood, Kasim Mermerdas
    Abstract:

    Ground granulated blast furnace slag (GGBFS), a by-product from iron industry, was recycled as artificial coarse aggregate through Cold Bonding pelletization process. The artificial slag aggregates (ASA) replaced partially the natural coarse aggregates in production of self-compacting concrete (SCC). Moreover, as being one of the most widely used mineral admixtures in concrete industry, fly ash (FA) was incorporated as a part of total binder content to impart desired fluidity to SCCs. A total of six concrete mixtures having various ASA replacement levels (0%, 20%, 40%, 60%, and 100%) were designed with a water-to-binder (w/b) ratio of 0.32. Fresh properties of self-compacting concretes (SCC) were observed through slump flow time, flow diameter, V-funnel flow time, and L-box filling height ratio. Compressive strength of hardened SCCs was also determined at 28 days of curing. It was observed that increasing the replacement level of ASA resulted in decrease in the amount of superplasticizer to achieve a constant slump flow diameter. Moreover, passing ability and viscosity of SCC's enhanced with increasing the amount of ASA in the concrete. The maximum compressive strength was achieved for the SCC having 60% ASA replacement.

  • properties of lightweight aggregates produced with Cold Bonding pelletization of fly ash and ground granulated blast furnace slag
    Materials and Structures, 2012
    Co-Authors: Mehmet Gesoglu, Erhan Guneyisi, Hatice Oznur Oz
    Abstract:

    Pelletization is a worldwide process used in producing artificial aggregates although its usage is not common in Turkey. In this study, lightweight aggregates (LWAs) were manufactured through Cold-Bonding pelletization of ground granulated blast furnace slag (G) and two types of fly ash with different finenesses (Fly ash A and B). Ordinary Portland cement (PC) was used as a binder at varying amounts from 5 to 20 % by weight. A total of 20 Cold-bonded lightweight aggregates were produced at room temperature with different combinations of PC, FA and/or G. The hardened aggregates were tested for specific gravity, water absorption, and crushing strength. Thereafter, lightweight concretes (LWCs) were produced with water to cement ratio of 0.50 and a cement content of 400 kg/m3 by using such lightweight aggregates. The hardened concretes were tested for compressive strength at 28 and 56 days to explore the effect of aggregate types on the compressive strength development. Test results revealed that the amount of cement content had a significant effect on the strength of LWAs which in turn governed the variation in compressive strength of the LWCs. The highest 28 and 56-day compressive strengths of 43 and 51 MPa, respectively were achieved for the concretes including LWAs produced from the blend of 40 % slag, 40 % FA-A and 20 % PC.