State Key Laboratory of Solid Waste Reuse for Building Materials

Beijing, China

State Key Laboratory of Solid Waste Reuse for Building Materials

Beijing, China

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Zhao L.,Peking University | Zhao L.,Nissin Electric Co. | Sun J.,Peking University | Sun J.,State Key Laboratory of Solid Waste Reuse for Building Materials | And 4 more authors.
Chemical Engineering Journal | Year: 2011

Silica-based adsorbent was prepared by radiation-induced grafting of dimethylaminoethyl methacrylate (DMAEMA) onto silanized silica (SS). The SS was pre-irradiated by electron beam (EB) and then reacted with DMAEMA solution at various conditions. The FTIR and TG-DTA spectra manifested that DMAEMA was successfully grafted onto the SS surface. Three kinds of typical hazardous metal ions (Cr (VI), As (V) and Hg (II)) were used to evaluate the adsorption properties of the resultant silica-based adsorbent. The adsorbent possessed sound Cr (VI) and As (V) adsorption ability as anion ion-exchange resin, and a particular selective adsorption for Hg (II) ions was found among other divalent cationic metal ions. The adsorptions of Cr (VI), As (V) and Hg (II) fitted with Langmuir mode, and their adsorption kinetics fitted well with pseudo-second-order model. These results suggested that SS-g-DMAEMA adsorbent has potential application for the removal of hazardous metal pollutants from wastewater. © 2011 Elsevier B.V.


Shen Q.-J.,Beijing Normal University | Shen Q.-J.,State Key Laboratory of Solid Waste Reuse for Building Materials | Liu X.-B.,Lu An Coal Mining Group Co. | Jin W.-J.,Beijing Normal University
Xinxing Tan Cailiao/New Carbon Materials | Year: 2013

Water-soluble hydroxylated multi-wall carbon nanotubes (MWCNTols) were synthesized by the NaOH/H2O2 oxidation method. A L9(34) orthogonal experimental design was used to optimize the preparation conditions, and TEM, SEM and Raman spectroscopy were used to characterize the products. The solubility of as-prepared MWCNTols in water was 0.72 mg/mL. Furthermore, MWCNTols were wrapped by polyvinylpyrrolidone (PVP) by solution blending. Good water-solubility of PVP further increases the stability and dispersibility of MWCNTols in water. The content of MWCNTols in PVP-MWCNTols is calculated to be as high as 41 mass%. The solubility of PVP-MWCNTols in water was up to 2.34 mg/mL. No aggregation or sedimentation was observed for a saturated solution during more than 2 month storage at room temperature.


Chen Y.,State Key Laboratory of Solid Waste Reuse for Building Materials | Bloomquist D.,University of Florida | Crowley R.,University of Florida
Applied Mechanics and Materials | Year: 2013

ASTM C78 standard tests for flexural strength of concrete were conducted on cellulose fiber reinforced concrete (CFRC) specimens using varying percentages of ultimate load. During testing, Acoustic Emission (AE) signals were recorded while after testing, a scanning electron microscope (SEM) was used to visually observe surface features. SEM results appear to illustrate three important stages of the fracture process: cement cracking, fiber-cement debonding, and fiber breakage/pullout. AE results were used to bound ranges for a relationship between AE amplitude and CFRC fracture mechanisms. © (2013) Trans Tech Publications, Switzerland.


Chen Y.,State Key Laboratory of Solid Waste Reuse for Building Materials | Bloomquist D.,University of Florida | Crowley R.,University of Florida
Applied Mechanics and Materials | Year: 2013

ASTM C78, the Flexural Strength tests were conducted on Cellulose Fiber Reinforced Concrete (CFRC) samples subjected to difference moisture-levels to quantify the effect of moisture on them. Results indicated that modulus elasticity did not change along the increase in moisture. However, flexural strength and yield strength appeared to be affected under certain conditions. © (2013) Trans Tech Publications, Switzerland.


Liu X.,Beijing University of Technology | Wang Z.,Beijing University of Technology | Zhu J.,Beijing University of Technology | Zheng Y.,State Key Laboratory of Solid Waste Reuse for Building Materials | And 4 more authors.
Colloids and Surfaces A: Physicochemical and Engineering Aspects | Year: 2014

The amide-structural polycarboxylate superplasticizers (amide-PCEs) were synthesized by amidation reaction between polyacrylic acid (PAA) and amino-terminated methoxy polyethylene glycol (amino-PEG) under different conditions, and the effects of amide-PCE's synthesis on amidation rate and flow performance of cement paste were investigated. Fourier Transform Infrared Spectroscopy (FTIR), 1H Nuclear Magnetic Resonance (1H NMR), and molecular-weight measurements were used for structural characterization, and the results confirmed ideal amide structure and sufficient amidation reaction. Amide-PCE with the carboxyl-amino ratio of 4:1 exhibited the lowest surface tension, highest adsorption percentage, and the best paste fluidity results. Based on the above results, the dispersion and adsorption mechanisms of amide-PCE in cement-water system were discussed. The application performances in concrete showed that amide-PCE had similar slump to that of conventional PCE, but also had better air-entraining ability, bubble retention and concrete frost-resistance than those of conventional PCE. Depending on this amide structure and good performances, amide-PCE shows broad application prospects. © 2014 Elsevier B.V.


Zheng Y.S.,Beijing University of Chemical Technology | Zheng Y.S.,State Key Laboratory of Solid Waste Reuse for Building Materials | Liu Y.J.,State Key Laboratory of Solid Waste Reuse for Building Materials | Tao R.,China National Center for Science and Technology Evaluation
Applied Mechanics and Materials | Year: 2014

Based on the database of Thomson Reuters, the bibliometric and patent information of China and US in the field of Building Energy Efficiency from 2006 to 2011 are searched. The R&D capacity of China and US in the field of Building Energy Efficiency are compared, the advantageous institutes in this field are identified. The cooperation trend between China and US on Building energy efficiency is analyzed. Some suggestions are proposed based on the data analysis. © (2014) Trans Tech Publications, Switzerland.


Li A.-H.,Shanxi University | Han J.-P.,State Key Laboratory of Solid Waste Reuse for Building Materials | Li J.,Shanxi University
Acta Crystallographica Section E: Structure Reports Online | Year: 2014

The asymmetric unit of the title compound, [Li2(C 12H12-NOP)6]Cl2·2CH 3CN, contains one-half of the centrosymmetric dication, one chloride anion and one acetonitrile solvent molecule. Each Li atom is coordinated by four O atoms [Li-O 1.891 (3) and 2.025 (3) Å] from the four diphenylphosphinamide ligands in a distorted tetrahedral geometry. In the crystal, weak N-H⋯Cl hydrogen bonds link the anions and dications into columns extending along [100].


PubMed | State Key Laboratory of Solid Waste Reuse for Building Materials and Shanxi University
Type: Journal Article | Journal: Acta crystallographica. Section E, Structure reports online | Year: 2014

The asymmetric unit of the title compound, [Li2(C12H12NOP)6]Cl22CH3CN, contains one-half of the centrosymmetric dication, one chloride anion and one aceto-nitrile solvent mol-ecule. Each Li atom is coordinated by four O atoms [Li-O 1.891(3) and 2.025(3)] from the four di-phenyl-phosphinamide ligands in a distorted tetra-hedral geometry. In the crystal, weak N-HCl hydrogen bonds link the anions and dications into columns extending along [100].


Cheng H.,North China University of Technology | Yang F.,State Key Laboratory of Solid Waste Reuse for Building Materials | Zhang J.,North China University of Technology
Advanced Materials Research | Year: 2012

In this paper, the heat-activated conditions of Neimenggu high aluminum coal gangue were studied, and then, the activated coal gangue as a supplementary cementitious material was used in concrete to investigate the application effect. The result shows that the optimal calcining temperature of high aluminum coal gangue is 800°C, the setting time of concrete was postponed, the slump was reduced and the resistance of concrete to chloride ion penetration was improved for the use of activated coal gangue. The compressive strength of concrete was enhanced when cement was replaced by 20%∼30% activated coal gangue powder. Pozzolanic effect of activated coal gangue in the early age (7d) is higher and it can promote the hydration of cement with each other. © (2012) Trans Tech Publications, Switzerland.


Zheng Y.C.,State Key Laboratory of Solid Waste Reuse for Building Materials | Li Q.,State Key Laboratory of Solid Waste Reuse for Building Materials | Liu Y.J.,State Key Laboratory of Solid Waste Reuse for Building Materials
Advanced Materials Research | Year: 2013

In this study, with iron ore tailing as an alternative to clay, three belite cement clinker samples were prepared in a muffle furnace at 1400°C for 10, 20 and 30 minutes respectively. And calcium sulphate and calcium fluoride were used as composite mineralizer with attempt to decrease clinkering temperature and improve hydraulic activity of dicalcium silicate. QXRD analysis shows that the major mineral components of the clinker are dicalcium silicate, account for over 80% of clinker, and trace amount of tricalcium silicate and ferrite. Scanning Electron Microscope (SEM) analysis indicates that mineral grains were growing with the prolonged soaking duration. EDS analysis identified that C2S has a Ca/Si ratio varying from 2.07 to 2.32. And XPS analysis shows substantial amount of S and F atoms indented on clinker surface. Using 4×4×16cm mortar specimen, the mechanical strength of belite cement with 5% gypsum addition was investigated based on Chinese National Standard. The testing results show that three belite clinkers give very promising strength development at early ages, and very high strength gain was achieved at 28 days. In addition, this belite cement has a Lime Saturation Factor (LSF) of 0.76, which make it have potential for significant CO2 emission reduction. Also, more than 35% iron ore tailing was exhausted for producing unit ton of belite cement clinker. High utilization rate leads to not only mineral waste exhaustion, also environmental improvement. © (2013) Trans Tech Publications, Switzerland.

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