Advanced Materials Research Vols. 150-151

Abstract: Kaolin/sodium lignosulfonate graft acrylic acid and acrylamide superabsorbents composites(LPAAM) were prepared by solution polymerization using sodium lignosulfonate, acrylic acid and acrylamide as raw materials, kaolin as inorganic filler, potassium peroxydisulfate as initiator, N,N’-methylene-bis-acrylamide as crosslinker and by saponifying 2h under 90 , 0.10mol/L NaOH solution. Its equilibrium absorbencies in distilled water and 0.9%NaCl solution are 1003g/g and 89g/g, respectively. The structure, morphology and thermal property are testing by FTIR, SEM and TG, respectively.

Abstract: Chinese government has announced to the world that, the carbon emission will decrease by 40-45% in 2020, after the World Climate Summit in 2009. To ensure people’s living quality, while limit the green house gas emission, the construction industry - a big energy consumer - must endeavor to explore new construction method, research and develop new construction material and use new energy structure to make our promise come true.

Abstract: This paper mainly studies the mechanical properties and microstructure of polyurea coatings (SPUA) through the experiment of dry-wet circulation. The influence of different curing time of SPUA coating before and after the dry cycle of the mechanical properties and surface morphology changes were researched. Use the alternating temperature and low bending tests to research,the variation of temperature changes to the SPUA of different curing time. The result of the dry-wet circulation experiment shows that the tensile strength of cured 1d, 3d and 7d SPUA coating after 30d dry-wet circulation increased 9.6%、19.2% and 44.7% respectively, the tear strength increased 3.2%、5.6% and 47.3% respectively. The microstructure research shows the 7d cured SPUA coating after 30 times dry-wet circulation will reduce the holes and narrow the hole diameter in a certain degree. The temperature change experimental results show that during -20 ～50 alternating temperature process, the tensile strength of the coating appears to increase, 3d and 7d cured SPUA coating after 40d temperature alternating tensile strength changing rate is -14.2% and 9.8% respectively. Low-temperature bending test shows that the SPUA coating will not appear any cracks cracking phenomena after placed the coating in （-20+2 ）for 168h.

Abstract: According to the system of asphalt pavement cold in-place recycling(APCIR), added proper Na2SO4 into different designed reclaimed asphalt pavement(RAP), the mechanical property effect of Na2SO4 on cement-reclaimed asphalt pavement mixture was studied. It showed that early strength of RAP rose with adding more Na2SO4. After adding Na2SO4, the strength of RAP in 5d would increase 12% than that RAP without adding Na2SO4, this technology will play the important role in asphalt pavement repairment.

Abstract: This paper deals with RPC produced by superfine slag powder(measured specific surface area is 1824 m2/kg) and natural sands with a low water-binder ratio(0.2 or so),which strength can achieve 100MPa after 28d standand curing. An analysis,based on the mercury intrusion porosimetry,is made of the relationship between strength and pore structure parameters.The results show that the strength can be improved in the range of 30～45%, when the dosage of superfine slag powder varied from 5% to 15%；the linearity between compressive strength,water-binder ratio and the hole with a daimetre larger than 100nm are 0.72 and 0.92 respectively;and the RPC’s 28-day compressive strength produced by the natural sands, with a maximum grain size of 4.75 mm,is almost equal to the RPC produced by standard sands.

Abstract: The kaolinite-potassium acetate composite was prepared by the immersion method. The intercalation composites were characterized by means of Scanning Electron Microscope (SEM), X-ray diffraction (XRD), Fourier transformation infrared (FT-IR) and High-resolution thermogravimetric analysis (HRTG). The results of XRD show that the intercalation of kaolinite by potassium acetate causes an increase of the basal spacing from 0.718 to 1.42nm. Thermal analysis shows the dehydroxylation of kaolinite decreased from 464 °C to 459.5 °C after intercalation of potassium acetate and three endotherms at 280, 323 and 459.5 °C attributed to the loss of water in the composite, potassium acetate and hydroxyl in the composite.

Abstract: In this paper, the requirements for processing equipments and technologies of mineral superfine powder used in HPC are analyzed. Mechanism and properties of DHM grinder and processing natural zeolite, slag and fly ash by DHM-160 grinder are investigated. Natural zeolite and slag achieve the fineness that 90% of which are smaller than 0.038 mm by DHM grinder. 99% of fly ash processed by it is smaller than 0.038 mm and 45% of that is smaller than 10 μm. Superfine powder processed by DHM grinder can meet the requirement of HPC, and its energy consumption is lower than using conventional equipments.

Abstract: The shape retention properties of tackified fabrics were studied in this article. And the effects of different concentrations’ tackifier content was analysed. Based on the present recovery performance test, a simple and feasible Instrument---Multi-angle measured recovery angle performance test was designed. The test results can clearly evaluate the deformation ability of the tackified woven fabrics.

Abstract: Al-ZrO2 composites were sintered in N2 atmosphere at 1000 oC, 1100 oC, 1200 oC and 1300 oC with ZrO2 and Al powders as raw materials. Formation mechanism of AlZrO and ZrAlON phases in Al-ZrO2-N2 systems were investigated by TG-DTA, XRD, SEM and EDS analyses. Results showed there existed new phases of ZrAl3O3N and AlxZr1-xO2-0.5x beside ZrO, ZrN, Al2O3, AlN and intermediate phases of Al7O3N5, Al8O3N6, ZrON, ZrON2, Zr7O8N4 in samples sintered at 1000 oC to 1300 oC. There existed process of mass transfer of ZrO2 in gas phase in samples at high temperature. Dynamics processes of ZrAl3O3N and AlxZr1-xO2-0.5x phases formed in N2 atmosphere at high temperature included contact reaction and ZrAlON sosoloid crystallization.

Abstract: The extraction kinetics of molybdenum(VI) with trialkyl amine (N235, R3N, R = C8–C10) dissolved in heptane has been investigated by constant interfacial cell with laminar flow. The stiochiometry and the equilibrium constant of the extracted complex formation reaction between Mo(VI) and N235 are determined. The influences of stirring speed, temperature, concentrations of extractant and chlorine on the extraction rate has been studied. It can be concluded that the mass transfer process is a mixed chemical reaction - diffusion controlled. The extraction rate equations and the rate-determining step have been obtained under the experimental conditions by predictions derived from interfacial reaction models. Based on the approximate solutions of the flux equation, diffusion parameters and thickness of the diffusion film have been calculated.