Beijing Building Construction Research Institute Co.

Beijing, China

Beijing Building Construction Research Institute Co.

Beijing, China

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Kong X.,Tsinghua University | Lu Z.,Beijing Building Construction Research Institute Co. | Yan J.,China University of Mining and Technology | Liu H.,China University of Mining and Technology | Wang D.,China University of Mining and Technology
Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | Year: 2013

The influence of triethanolamine (TEA) on the elemental concentrations in the aqueous phase of hydrating cement pastes was investigated via inductively coupled plasma atomic emission spectroscopy (ICP-OES). The results show that the TEA increases the concentrations of Fe, Ca, and Al, as well as those of S, Si, and OH- in the aqueous phase of the fresh pastes. The isothermal calorimetry experiment indicates that the TEA addition of 0.1% increases the first peak of cement hydration and extends the induction period. The total organic carbon (TOC) results show that the TEA in the aqueous phase of the hydrating cement pastes is rapidly consumed in the acceleration period of cement hydration, suggesting that TEA could be incorporated into the hydration products via either chemical reaction or physical adsorption. The measurement of conductivity of saturated Ca(OH)2 solution confirms the formation of the complex between the TEA and calcium ions.


Kong X.-M.,Tsinghua University | Lu Z.-B.,Beijing Building Construction Research Institute Co. | Liu H.,China University of Mining and Technology | Wang D.-M.,China University of Mining and Technology
Magazine of Concrete Research | Year: 2013

The influence of triethanolamine (TEA) at varying dosages on the strength development of pure cement (PC) and fly ash cement (FAC) pastes was systematically investigated. Techniques including mercury intrusion porosimetry, X-ray diffraction, thermogravimetric analysis and scanning electron microscopy were employed to characterise the microstructure of hardened cement pastes and to monitor the cement hydration process with the aim of correlating strength variations with microstructural changes caused by TEA addition. The results showed that 0.03-0.10% addition of TEA visibly enhances the early strength but decreases the compressive strength after 3 d for PC pastes. A high dosage of TEA (1%) leads to a sharp decrease in 28-d strength for both PC and FAC pastes. Mechanistic explanations regarding why TEA affects the strength development differently at different dosages and ages are discussed by considering the impacts of TEA on the hydration degree, pore structure, composition and morphology of hydration products.


Liu Z.,Post Doctoral Research Center | Liu Z.,Tsinghua University | Zhang R.,Beijing Building Construction Research Institute Co.
Advanced Materials Research | Year: 2012

Cable is widely used in the actual project of prestressed steel structure for its mechanical properties can be fully used. Saddle-shaped cable net is a new type of large-span prestressed structure, but there is little study on the impact of different cable types on the mechanical properties of saddle-shaped cable net during the construction. In order to meet the thought of integration of design and construction, a finite element model of saddle-shaped cable net has been established. The four types of cables such as semi-parallel steel tendon cable, steel wire rope cable, steel strand cable and full-locked coil rope are chosen. The impact on mechanical properties of the structure was analyzed by different cable types. © (2012) Trans Tech Publications.


Song J.,Beijing Construction Group Co. | Song J.,Tsinghua University | Li Z.,Beijing University of Technology | Wang Y.,Tsinghua University | Zuo Y.,Beijing Building Construction Research Institute Co.
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2015

A monotonic axial compression test was performed on two series of short column specimens in order to investigate the size effect of axial compressive mechanical properties of confined concrete. The main test variables were volumetric ratio of stirrup and specimen size. The diameter of largest specimen was 576 mm. The test result shows that as the specimen size increases, the peak stress and the peak strain of confined concrete decreases. The relationship between ductility and specimen size is indistinct. When factorial analysis method is used to analyze the test results, it can be found that the volumetric ratio of stirrup has significant influence on peak stress, peak strain and ductility of confined concrete. The specimen geometric size affects peak stress and peak strain significantly, but no great influence on ductility. The interaction of volumetric ratio and geometric size does not affect peak stress, peak strain and ductility too much. Based on the test and the analysis results, a stress-strain constitutive model in terms of column confined by hoops is established. Its prediction value fits well with the test result of this thesis. ©, 2015, Science Press. All right reserved.


Yan X.,Tianjin University | Wang L.,Beijing Building Construction Research Institute co. | Du X.,Beijing University of Technology
Applied Mechanics and Materials | Year: 2013

In order to investigate isolation effectiveness on seismic performance of the continuous rigid frame bridge, shaking table test with nine sub-tables on 1/10 scaled reinforced concrete rigid frame bridge specimen was performed. The experimental results demonstrate that isolation devices provide flexibility to transform natural period of the scaled model, and additional it can improve the ability of energy dissipation when lead is used. The initial first frequency is 8.17Hz for plate-type rubber bearing and 9.12Hz for leading rubber bearing. The plate rubber bearing and lead-rubber bearing are quite sensitive to seismic wave frequency. The use of various isolation devices affects response of the bridge model. The results show that the more difference in the isolation devices, the more difference in response. Moreover, isolation effect of lead-rubber bearing show obviously more advantage than the one of plate-type rubber bearing, especially in controlling responses of the bridge during major earthquakes. © (2013) Trans Tech Publications, Switzerland.


Wang Z.,Beijing Building Construction Research Institute Co. | Cheng S.,Jinggong Steel Building Group | You D.,Beijing Building Construction Research Institute Co. | Yang G.,Government Investment Basic Construction Office of Ordos Ejin Horo Banner | And 3 more authors.
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2012

This paper focuses on the solution to the technical problems confronted during the construction process of the cable dome with a diameter of 71.2 m, i.e. the controlling of structural construction error, component size error, installation and shaping methods of structures, the order and method of pretensioning and the construction simulation and monitoring. The internal and middle ridge cables, internal and middle slope cables are fixed length cables. The outer ridge cable and the outer slope cable are variable length cables to adjust the construction error. On the basis of a brief summary of the construction experience abroad, it proposes the method of integral assembling on the ground and synchronous hoisting of outer ridge and slope cable, shaped by stretch the outer slope cable, which has reduced aerial work and guaranteed constriction security. Secondly, based on the theory that the cable dome is a flexible construction with several symmetry axis, the construction method of verified batches and levels was finally proposed, based on which, tension construction of the project was completed. From the monitoring data, the configuration of the actual structure was generally identical with the configuration designed.


Yan X.,Tianjin University | Wang L.,Beijing Building Construction Research Institute co. | Du X.,Beijing University of Technology
Advanced Materials Research | Year: 2013

To investigate the response of the bridge pounding, shaking table test was performed using 1/10 scaled reinforced concrete rigid frame bridge specimen. The influence of traveling effect on pounding and the anti-impact capability using dampers were discussed. The experimental results demonstrate that the acceleration responses of the girder and bridge piers, the frequency and the impact force are increased when the traveling wave excitation is considered. Moreover, relatively displacement of the adjacent bridge frames increased magnitudely. Dynamic responses, the frequency and the impact force are decrease when the dampers are installed.Therefore, installation of the dampers is a sustainable and effective way to improve the anti-impact capability. © (2013) Trans Tech Publications, Switzerland.


Dong Q.,CAS Beijing National Laboratory for Molecular | Dong Q.,Beijing Building Construction Research Institute Co. | Liu M.,CAS Beijing National Laboratory for Molecular | Ding Y.,CAS Beijing National Laboratory for Molecular | And 6 more authors.
Polymers for Advanced Technologies | Year: 2013

The synergistic effect of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) immobilized silica (SiO2-DOPO) nanoparticles with an intumescent flame retardant (IFR) on the flame retardancy of polypropylene (PP) was investigated by UL 94 vertical tests and limiting oxygen index (LOI) measurements. It was found that the PP/IFR composites (25 wt%) achieved the UL94 V0 grade and LOI increased to 32.1 with an incorporation of 1.0 wt% SiO2-DOPO nanoparticles. Based on thermogravimetric analysis, scanning electronic microscopy and rheological analysis, it is speculated that three factors are mainly contributed to the improvement of the flame retardancy. First, the thermal stability of PP/IFR composites was improved by incorporating SiO2-DOPO nanoparticles. Second, the presence of SiO2-DOPO nanoparticles could induce the formation of a continuous char skin layer during combustion. The compact char layer could effectively impede the transport of bubbles and heat. Third, rheological analysis indicated that SiO2-DOPO nanoparticles could increase viscosity of the PP/IFR composites, which was also benefited to increase flame retardancy. © 2013 John Wiley & Sons, Ltd.


Li Z.C.,TianJin Vocational Institute | Liu Z.S.,Beijing Building Construction Research Institute Co.
Advanced Materials Research | Year: 2014

Saddle-shaped cable structure is a new form of prestressed structure. Its reliability need to be analyzed for a new type structure. According to the different failure modes, the finite element model of prestressed steel structure is established. By using APDL language, the program is created. Finally, the reliability index of the model for different failure modes is got by reliability analysis. The results Provides reference basis for mechanics performance evaluation of prestressed structure. © (2014) Trans Tech Publications, Switzerland.


Lan C.,Beijing Jiaotong University | Lan C.,Beijing Building Construction Research Institute Co. | Liu H.,Beijing Building Construction Research Institute Co. | Tian Y.,Beijing Jiaotong University
Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument | Year: 2013

Liquid pressure is one of the most important loads in head conduit construction. It is still a big challenge to set up a durable and stable long-term liquid pressure monitoring system under harsh environment with traditional liquid pressure sensor. In this paper, in consideration of the environmental condition of a certain major project, based on dual fiber Bragg grating (FBG) sensing principle, a FBG-based liquid sensor structure is developed and optimized, and its sensing principle is also given in details. The novel sensor was tested in a great number of calibration experiments; and the experiment data are consistent with the theoretical analysis nicely, their difference is less than 3%. The calibration data of randomly selected 100 sensors were analyzed with statistical method; and the main performance indexes are as follows: the measurement range is 0-2.5 MPa, the resolution is less than 0.4% F·S, the hysteresis is less than 2.4% F·S, the repeatability is less than 2.3% F·S, the linearity is less than 2.1%F· S, and the overall accuracy is less than 4% F·S. The research results show that the FBG-based liquid pressure sensor has good linearity, repeatability, accuracy and self temperature compensation ability; and the theoretical sensitivity agrees well with that of the experiment results. The proposed FBG-based liquid pressure sensor is suitable for the liquid pressure test in head conduit construction, can meet the actual engineering requirements and has bright application prospect.

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