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Han W.,China Building Material Test and Certification Group Co. | Cong L.,China Building Material Test and Certification Group Co. | Chen P.,China Building Material Test and Certification Group Co.
Key Engineering Materials | Year: 2017

Asbestos is a natural fibrous silicate mineral in general, and has good abrasion resistance, heat insulation properties, and is used extensively for construction, insulation, friction, sealing materials. However, it was discovered that asbestos is inhaled into lungs easily lead to pulmonary fibrosis, then induced cancer, so asbestos has been identified as carcinogens. In this paper, pretreatment methods and detection methods for asbestos were introduced. Currently pretreatment methods for asbestos mainly include an acid method, an organic solvent method, potassium chloride solvent method, ashing method, grinding method and mixing using a variety of methods for asbestos pretreatment. Detection methods for asbestos mainly include XRD, PLM, SEM, PCM, TEM, IR, DTA, which can qualitative analysis and quantitative analysis for asbestos. In this paper, the above mentioned methods are introduced, and the characteristics of each method are analyzed, the advice of more appropriate for asbestos detection method is proposed. © 2017 Trans Tech Publications, Switzerland.

Xu D.H.,China Building Material Test and Certification Group Co. | Liu S.H.,China Building Material Test and Certification Group Co. | Chen P.,China Building Material Test and Certification Group Co.
Key Engineering Materials | Year: 2017

A quantitative ion chromatographic analytical method for the determination of fluorine in fluorocarbon coatings is proposed. The extraction of the anions from the samples was performed using potassium hydroxide after centrifugation drying to dissolved at preference temperature. Using H column to remove large amounts of potassium ions in the solution. The solution was filtered ith 0.22 μm filtering membrane, 25μL of the filtrate were separated on AS18 separation column and AS18 protective column using buffer solution of 30 mmol/L potassium hydroxide solution mobile phase. In paper describe the observed limits of detection and of quantitation in percent and the mean relative standard deviation in percent. This method is simple operation, less interference factors, fast analysis speed, the determination results accurate and reliable, with good repeatability and reproducibility. © 2017 Trans Tech Publications, Switzerland.

Yu Y.,China Building Material Test and Certification Group Co. | Sun T.,China Jingye Engineering Co.
Key Engineering Materials | Year: 2017

As the integrant construction material for infrastructure construction and real estate industry, building waterproof materials is a key part of the construction quality guarantee. It plays an important role in saving energy, reducing consumption and environmental protection. It lays the foundation for the realization of the cleaning production and high efficiency for economical production. Currently, the direction of waterproof construction is from multi-layer to single layer, from heat to cold construction. There are many different kinds of waterproof materials on building materials market. When the waterproof materials need to be used for the project, we should deal with problems case by case in order to be able to select the waterproof coating suitable for the characteristics of the project. Attention need to be paid for the differences of the constituents, the physical, mechanical properties and characteristics, and construction points and matters during construction works polymer-modified cement waterproofing coating and cementitious capillary crystalline waterproofing materials are reviewed in the present study. Waterproof mechanism and influence factors of its application discussed. As a new type of waterproof materials, its unique advantage and price decline, it has been widely used in industrial and civil buildings, and the remarkable economic benefits and social benefits has been achieved in past few years. © 2017 Trans Tech Publications, Switzerland.

Zhang L.,South China University of Technology | Yao X.,South China University of Technology | Zang S.,China Building Material Test and Certification Group Co. | Han Q.,South China University of Technology
Materials and Design | Year: 2015

During airplane related accidents, the transparent polyurethane interlayer is finding new applications in the aircraft protection as an interlayer of windshield to enhance structural survivability under impact loading. Using dynamic mechanical analysis, Instron testing system and low impedance Split Hopkinson Tension Bar (SHTB), dynamic tensile response of a transparent polyurethane interlayer is studied experimentally under wide ranges of strain rates and temperatures. Based on the constitutive theory and the experimental data, thermal-viscoelastic Zhu-Wang-Tang (ZWT) constitutive model is employed to describe the tensile response of the polyurethane interlayer. The experimental results also reveal the time-temperature equivalence relation for the polyurethane interlayer. Strain rate and temperature are put together to a unified parameter by introducing a dimensionless parameter, and a unified curve reflecting the time-temperature equivalence relation is obtained. © 2014 Elsevier Ltd.

Liu Z.,China Building Material Test and Certification Group Co. | Bao Y.,China Academy of Building Research
Advanced Materials Research | Year: 2011

Building-integrated photovoltaics (BIPV) is a relatively recent new application of photovoltaic (PV) energy technologies whose energy output is affected by many design-related factors including PV module technologies, installation orientation, tilt and shadow range of solar panels. The shading analysis of a residential house's PV roof in Beijing was conducted by using building analysis program Autodesk Ecotect 2010. Analysis result shows that there is no shadow on the PV roof from 9a.m to 4p.m in winter solstice when the solar altitude angle reaches minimum, which ensures almost no shading losses for the PV modules over the year. The differences in monthly energy output were compared in the case of different installation tilt of solar panels and PV module technologies. Finally, the contribution to the building energy of the PV roof was discussed. The results show that appropriate design and selection of PV modules can compensate for the energy requirements for building heating and cooling to some extent. © (2011) Trans Tech Publications, Switzerland.

Yuan X.,China Building Material Test and Certification Group Co.
Key Engineering Materials | Year: 2012

Through collecting and analyzing thermal data from on-site testing of more than 30 cement plants, combining with design indicators of production line and control parameters in practical operation, the paper has summarized 4 first level, 5 second level and 133 third level energy efficiency evaluation indicators of cement enterprises after an in-depth study on the main factors influencing coal and power consumption of cement plants. On this basis, an energy efficiency evaluation system of new suspension preheater cement enterprise is to be established in China. It is expected to provide cement enterprise the basis of mastering the level of energy management and checking questions of energy utilization, to play guiding functions in settlement of energy-saving measures, development of energy-saving potential and reduction of energy consumption. © (2012) Trans Tech Publications.

Peng C.,China Building Material Test and Certification Group Co. | Yang W.,China Building Material Test and Certification Group Co.
Key Engineering Materials | Year: 2016

In order to improve the properties of MgO-Cr2O3 refractory, the effect of ZrO2 addition in MgO-Cr2O3 refractory physical properties and RH degasser slag corrosion resistance was investigated. The results show that the presence of ZrO2 additive increase the density of MgO-Cr2O3 samples largely due to promotion of grain boundary activities and ultimately direct bond formation. Simultaneously, the high temperature mechanical properties and corrosion resistance are improved in this test. The results also indicate that in the RH degasser slag system with a high ratio of calcia to silica, the slag resistance behavior of MgO-Cr2O3 composite with ZrO2 added could be described as follows: the ZrO2 reacts with CaO to form the CaZrO3 compound, this kind of compound could increase the corrosion resistance performance by blinding pore and the reaction could also thick the viscosity of slag, it is expected to be the major reason that the corrosion resistance of MgO-Cr2O3 refractory is improved by the addition of ZrO2. © 2016 Trans Tech Publications, Switzerland.

Liu Z.,China Building Material Test and Certification Group Co.
Advanced Materials Research | Year: 2011

For achieving the maximum energy efficiency of Building-integrated Photovoltaics (BIPV) buildings, the Solar Heat Gain (SHG) through the BIPV modules should be measured accurately. A solar calorimetry hot box was designed to test the SHG through the BIPV modules in this paper, which could measure the incoming solar and long-wave radiation various BIPV module configurations. Combined with the electric energy production, a new concept of ratio of solar heat gain to power energy generation efficiency was presented in this paper, which can be characterized as the design indicator of BIPV module's energy efficiency level for BIPV buildings cooling in hot summer. The influence of indoor climate environment parameters on the electric energy output efficiencies of BIPV modules can be conducted by the solar calorimetry hot box. © 2011 Trans Tech Publications, Switzerland.

Wei C.,Xi'an Technological University | Liu Z.,China Building Material Test and Certification Group Co. | Deng X.,Xi'an Technological University
Advanced Materials Research | Year: 2011

In recent years, Building Integrated Photovoltaic (BIPV) system has been becoming one of most important application of solar energy. Heat is the key of the BIPV design. If the temperature of photovoltaic modules is too high, it will affect the efficiency of solar cells, the structure performance of the components and service life. This paper present a photoelectric-thermoelectric (PV-TV) model which can collect heat from the solar panels so that to reduce its surface temperature, and then to generate electricity by using of temperature difference technology and devices. The model presented in this paper provides designers a new concept in BIPV design. © (2011) Trans Tech Publications, Switzerland.

Zhang R.,China Building Material Test and Certification Group Co.
Key Engineering Materials | Year: 2016

A new method of using ion chromatograph (IC) to test chloridion content in the cement was introduced in this paper. Compared with existing methods, in the experimental processing, IC method can avoid tedious pretreatment processing steps and highly toxic reagents. After 6 times of parallel experiments, IC method showed lower standard deviation and repeatability limit than Ammonium thiocyanate titration method and distillation and titration method. The repeatability limit of IC method is about 0.0006 %. From the parallel experiments, we can find, IC method showed high reproducibility and instrument stability. © 2016 Trans Tech Publications, Switzerland.

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