Advanced Materials Research Vols. 399-401

Abstract: A thermal conductive and insulating material with H₃PO₄ as the adhesive, AlN as the principal material of thermal conduction and Al₂O₃ as auxiliary material, was researched and developed in this paper. The paper explores the influences of components on density, thermal conducting property and dielectric property of the material. Research results show that as to the block sample of (mol)AlN: (mol)Al₂O₃=90:10, ω(H₃PO₄)=12% in the research, its density is 2.51 g/cm³, thermal conductivity is 5.655 W/(m•K), and relative dielectric constant under 10 kHz is 6.207.

Abstract: The influence of the way and the volume of adding lime dust to fly ash-cement pastes on chloride physical adsorption capacity, chemical combination capacity and binding capacity of fly ash-cement pastes is investigated by adsorption equilibrium method. The results show that with the volume of lime dust as cement replacement raising, the amount of chloride physically adsorbed by fly ash-cement pastes reduces, while the amount of chloride chemical combining is firstly increase, and then decrease, and it reaches the maximum when the lime dust content is 10% , that of chloride binding is firstly increase, and then decrease, which reaches the maximum when the lime dust content is 5%. In addition, with the volume of lime dust as fly ash replacement increasing , the volume of chloride physically adsorbed by fly ash-cement pastes reduces firstly, and then raises, reaching the minimum when the lime dust content is 6%. Whereas, volume of chloride chemical combining and binding both decrease gradually with the increase of lime dust contents. When the population of lime dust as cement or fly ash replacement is low(less than 15% for cement and 9% for fly ash), effect of lime dust content on chloride binding capacity of fly ash-cement pastes is not obvious (under 7.5%).

Abstract: The experiment is performed using three additives, Neopentyl Polyol Ester (NPE) as the base oil. This uniform design involves three independent variables and three dependent variables. It is belong to many factors and multi-objective investigation problem. With experimental results adopt U7 table seven levels of uniform design, the results showed that the design is optimizes the lubricant formulation, reached improve experiment efficiency, reduce the number of purpose and have a satisfactory results in retest experiment.

Abstract: In this study, plain and mineral admixture (slag, fly ash and silica fume) modified concrete prisms were made with three water-to-binder ratios (w/b), and four test methods (Rapid Chloride Permeability Test-ASTM C1202-91, AC Conductance Test, 150-days Ponding Test, Alternate Wetting and Drying Test by cyclic loading with salt solution and drying) were employed to measure the concrete prisms’ chloride penetrability. The effects of mineral admixtures on the concrete chloride permeability were discussed, and the correlation of results separately obtained from the four test methods were analyzed. The experiment results indicate that blending concrete is beneficial with regard to the resistance against chloride ion penetration, and good linear ralationship between charge passed and innitial current, charge passed and conductance, charge passed and chloride diffusion coefficients by 150-days Ponding Test, charge passed and diffusion coefficients by Alternate Wetting and Drying Test were obtained.

Abstract: There is much more profit in synthesis of cordierite from high-alumina fly ash, comparing with common fly ash. In this paper, the high-alumina fly ash collected from the Jungar power plant was calcined, grinded, beneficiated with HCl, diluted and dried. Furthermore, the cordierite was conducted from the purified fly ash and talc powder mixtures by solid reaction sintering. The physical properties of the cordierite samples were measured using Archimedes’ method, and the phase of cordierite samples was analyzed by XRD and the microstructure of the cordierite samples was observed by SEM. The results show that the cordierite, based on the proportion of the treated high-alumina fly ash and talc powder designated as 1.515/1 at 1350°C or/an 1370°C for 2h or/and 3h, could meet the quality requirement of physical properties, and the major crystalline phases in the sintered samples were predominantly α-cordierite (indialite) with minor crystals of mullite, spinel and almost no glassy matter.

Abstract: Cold ramming paste was successfully synthesized used electro-calcined anthracite (ECA) and artificial graphite as aggregate and phenol-formaldehyde (PF) resin as binder. Synthesized paste was measured by electrical resistivity, compressive strength, Infrared Spectrum (IR) and Thermo Gravimetry (TG), etc. The results show that the synthesized paste has some excellent physical properties such as low electrical resistivity and high compressive strength, all of which can meet industry requirements. Thermal decomposition and condensation of the paste can be divided into four stages by TG. Finally, it is found that the synthesized cold ramming paste is an ecofriendly material by the toxicity measurement of gas phase escaping from the heated paste

Abstract: Lightweight concrete has been used for structural purposes for many years and it is developed very fast in resent years due to its lightweight and favourable for insulation properties. High strength foam concrete is a fairly new kind of lightweight concrete with excellent properties of outstanding workability, low density and high strength. Responsible for these properties are the macro-, meso- and micro- porosity of the foam concrete which are mainly affected by the foaming agent. The influence of foaming agent’s dilution ratio and foam dosage on the fluidity, compressive strength, flexural strength and drying shrinkage of high density foam concrete designed for structural materials is investigated in this paper.

Abstract: Phase change materials (PCMs) using in the building energy storage field can satisfy people’s requirement of thermal comfort and attain function of energy saving and adjustment. This article experimental studies thermal Characteristics of a hydrated salt PCMs (TH29) ,which involves phase change process and was used in building energy storage, tests the different solid/liquid ratio of the phase change material, the whole time of phase change, and the delayed effect at different locations in phase change process, phase-changing cycles and thermal stability and TH29 temperature variety at heating and cooling modes and the delay phenomena on different location. The experimental results show that a good thermal stability of TH29 after long term phase-changing cycles can be attained under this test condition.

Abstract: In recent years, constructed wetland technology as an alternative to conventional sewage treatment technology process has been widely used, industrial waste, agricultural waste, non-point source pollution control and reconstruction wetlands. Because the technology can remove organic pollutants and nitrogen and phosphorus and to beautify the environment has become widely accepted, the goal of this work was to provide different constructed wetland substrates and their applications. This study was designed to determine differences in the ability of different types of constructed wetland substrates.

Abstract: A novel environmentally friendly water treatment agent was prepared by the natural bentonite and PDMDAAC. The treatment effect of direct black G dyeing wastewater on different preparation conditions was studied. The decoloration rate reached 98.57% under the optimized conditions (cross-linker concentration of 40g/L, M-V of 12 g/L, contact time of 75min, particle size of 0.124mm). The performance characterization of the modified bentonite was observed by means of X-ray diffraction, scanning electron microscopy. The PDMDAAC has entered into the bentonite interplanar space. The adsorption properties of bentonite were improved, which was suitable for the treatment of dyeing wastewater.