Materials Science Forum Vols. 510-511

Abstract: The development of mineral wool core sandwich panel depends on the reaction of resin on mineral wool and face sheet. The most important factors in developing the mineral wool core are optimization of the Curing system and density of the used resin. In addition, this product considers the functional effect and good environment instead of organic form core. This paper studied the curing conditions, the density of used resin, and the functional effect after manufacturing the mineral wool core.

Abstract: While more attention has been paid in recent years to urban point source pollution control, no considerable measures have been taken to control urban non-point source pollution. Contaminants from non-point sources deposited on urban impermeable surfaces such as road and highway are easily released to the public waters by rainfall, leading to the deterioration in water quality in urban area. Experiments were performed using a reactor and real rainwater runoff obtained from road surfaces at various pollutant loading and rainfall intensity to determine the criteria for the first flush rainwater and to evaluate the applicability of the reactor for treating road runoff. The results at different rainfall intensities show that the medium PPB is superior to the other media for water permeability. PPB was not blocked at 10 mm/hr rainfall, and its permeability was stable. On the other hand, PVS and PPF resulted in a substantial overflow ratio even at 1 mm/hr rainfall intensity. Comparison of treatment efficiencies for suspended solids showed that all media showed similar removal efficiency ranging from 91% to 95%. However, PPB seems to be better than the other media considering its higher water permeability. PPB and PPF, both hydrophobic, yielded over 76% of heavy metal removal. But the hydrophilic media PVS showed much smaller removal efficiency ranging from 26% to 47%. The treatment efficiencies over PAHs (Poly Aromatic Hydrocarbons) showed the similar removal efficiency ranging from 66% to 97% for all three media. In this study a reactor using filter media was investigated to reduce the level of contamination in urban road runoff.

Abstract: The conversion of residue, by extraction processing of aluminum ions from coal fly ash to zeolitic materials by hydrothermal treatment in the presence of NaOH solution, was investigated and the resulting material characterized.

Abstract: Composites of polymer/inorganic materials have comprehensive properties and they are widely used in many fields of the industry. In the present work, methacrylate copolymer/silica composite materials were prepared by mixing and blending process. The mechanical properties such as flexural, compressive strength of yield composite were obtained as the function of mixing ratio. The optimized composite materials have been used as quick repair materials in the Chengyu (Chengdu to Chongqing) highway, southwest China. The results showed that the composite material was better than cement concrete rehabilitation, and the traffic could be allowed to open over repaired patches after 1.5-5 hours.

Abstract: The fabrication and fluorescence properties of luminescence porous ceramics were investigated by using recycling glass addition of oxide phosphor to determine the suitability of this material for the application of recycling glass. The aim of this study was to give the fluorescence performance to the porous ceramics using recycling glass with phosphor material. The samples showed a good "Eco" luminescence porous ceramics of about 60 to 70 % porosity using recycling glass.

Abstract: This paper investigates the effect of the pair-minerializer (CaSO4,-CaF2) on the reaction of alite, belite and calcium langbeinite formation with different alkali and sulfate contents. A set of clinker samples was prepared by adding laboratory grade reagents of (NH4)2SO4, CaF2 and K2CO3 to the cement raw mixes. The mineralogical composition of clinker was analyzed by X-ray powder diffraction, and the quantity of minerals was evaluated by using TOPAS software. As the experimental results, the total amount of calcium silicate minerals was rapidly increased with the addition of F and SO3 components simultaneously as pair-mineralizer with K2O more than the value which mineralizer was added separately. Also, in the case of adding K2O only to the raw mixes, the amount of alite is decreased after clinkering. However, if alkali (K2O) and pair-minerializer (CaSO4,-CaF2) were added simultaneously, the quantity of alite and calcium langbeinite mineral increased because of the formation of stable clinker minerals by the reaction of alkali (K2O) and sulfate.

Abstract: This study focused on the synthesis of zeolite from coal bottom ash and the CEC assessment of synthesized products. To that end, zeolificaion tests were carried out at four temperature levels (80, 100, 120, 150oC) and five NaOH concentration levels (1, 2, 3, 4, 5M) by the alkali hydrothermal method. Consequently, NaP1, hydroxy-sodalite, and tobermorite were produced from coal bottom ash. NaP1 with an excellent cation exchange capability had a high crystallinity at below 2M NaOH and 120 oC; and the maximum CEC value was 160meq/100g at 2M NaOH and 120 oC under the given conditions.

Abstract: In this paper, the application of wastes as raw materials to cementitious mineral was investigated. A rolling slag, which contains plenty of heavy metals, was used as a raw material to synthesize calcium sulfoaluminate. It was found that the suitable burning temperature of CSA clinker is between 1,250°C and 1,300°C, and the residual content of heavy metals in the CSA clinker turned out sequentially as Cu, Zn, Cr, and Pb. According to the results of the investigation, it is believed that a large amount of the Cu, Zn and Cr present in the raw materials were fixed in the CSA clinker formed during the sintering process. It was further found that the distortion of the crystal morphology of hydrate, which was ettringite, took place according to the substitution of heavy metals during the hydration process.

Abstract: From materials view point, a PCB (Printed Circuit Board) is a simple mixture of various metals, plastics and oxides. Thus, it can be regarded as urbanized resources or ores. The existence of valuable metallic components in used PCB, then, becomes a major driving force for the recycling In this study, the effect of slag compositions on the extraction of valuable metallic components from the used PCB is investigated. Especially, a melting temperature of slag and slag viscosity are discussed as major operating parameters. PCB contains nearly 30wt% of SiO2 and 20wt% of Al2O3 as major oxides, and by just adding other flux components to used PCB, 20wt%Al2O3-Xwt%SiO2 - Ywt%CaO-10wt%MgO slag system with low melting point and low slag viscosity can be made to extract metallic components from used PCB by gravity separation. The slag basicity was changed under fixed compositions of Al2O3 and MgO. It was found that a proper melting temperature and slag basicity to make a homogeneous liquid slag and to extract metallic components from used PCB were 1573 K, and 0.75, respectively.

Abstract: Cordierite is known as three different crystalline forms, such as metastable form (µ- cordierite), high temperature form (α–cordierite; indialite), and low temperature form (β-cordierite). In general, cordierite has a phase transition behavior from metastable form to high temperature form. In this study, we focused to synthesize the porous cordierite at low temperature using reaction method without metastable form. When we used a pure starting powders (Al2O3, MgO, and SiO2), metastable cordierite and Mg spinel phase was obtained during the heat treatment. However, fly ash based mixture used as a starting powder, we obtained a porous α–cordierite at low synthesis temperature through transition from sapphirine/spinel and mullite/spinel