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Deng G.-R.,Tianjin Municipal Engineering Research Institute | Deng G.-R.,Changsha University of Science and Technology
Dongbei Daxue Xuebao/Journal of Northeastern University | Year: 2012

According to the situation of mixture gradation range shortage of foamed asphalt cold recycled at domestic and abroad, the study of cement treated base (CTB) material was carried out. Based on the domestic and foreign asphalt cold regeneration technology regulations and the requirements of the CTB gradation range, the CTB gradation was divided into five groups, which were tested on the optimum mixing water, optimum water content and the optimum asphalt content, and then the CTB mixture ratio of foamed asphalt stabilization was designed. According to the grading range value, the foam asphalt mixture fatigue was tested, through which the foam asphalt mixture fatigue life equation was obtained. The work lays a foundation for mixture ratio optimization of foamed asphalt cold recycled. Source

Tao J.,Tianjin University | Song X.,Tianjin Municipal Engineering Research Institute | Liu J.,Tianjin University | Wang J.,Tianjin University
Chemical Engineering Science | Year: 2013

Through a lately developed boundary element method, this paper investigates the rheology of the multiple-emulsion globule with various internal structures in a contraction tube. As fine templates to prepare microcapsules for targeted drug delivery, multiple emulsions (ME) with complex structures have been generated through microfluidics. The deformation and breakup of multiple emulsions in a microchannel are critical to the transport and release of their inclusion. However, the numerical investigation of the rheology of multiple emulsions in a contraction tube is only limited to a simple case, i.e., core-shell double emulsions (CSDE), currently. In this paper, the boundary element method is employed to investigate the deformation and displacement of 2-dimensional globules of three types of multiple emulsions, i.e., concentric ME with multiple layers, double emulsions containing multiple inner droplets and ME with asymmetric internal structures, in a contraction tube. Comparing to those of CSDE, the complication of internal structures and the collision among inner droplets will subject the globule to flows with higher pressure drops when the volume flow rates are fixed. © 2013 Elsevier Ltd. Source

Lin J.,Jiangxi University of Science and Technology | Jiang P.,Tianjin Municipal Engineering Research Institute
Communications in Computer and Information Science | Year: 2011

Against the risk problem in the investment decision of construction project, we can calculate the distribution probability of project evaluation index through computer simulation technology and quantitatively analyze the risks of the project in order to provide necessary decision-making information for investors and reduce blindness in decision-making. Investment risk of construction projects is mainly reflected in the form of economic risk. The combined action of various risk factors directly leads to the changes in project cash flow and ultimately affects the evaluation index of the project. This paper takes the specific water project as an example, analyzes various risk factors, and then estimate the changes caused by it in cash flows to get the cash flow including risk factors. Whereby conducting risk assessment for evaluation index to obtain the viable probability of the project, which will be regarded as a basis for investment decision. © 2011 Springer-Verlag. Source

Jun Z.,Tianjin Municipal Engineering Research Institute
ICPTT 2012: Better Pipeline Infrastructure for a Better Life - Proceedings of the International Conference on Pipelines and Trenchless Technology 2012 | Year: 2013

In order to standardize the inspection and evaluation methods for Drains, by studying the non-excavation pipeline repair project in Tianjin and the surrounding areas, the quality assessment parameters, choose CCTV Inspection for the best, finally concludes the defect type, establish the condition assessment model, including structural and functional defects. Investigate the technical specification for CCTV inspection and evaluation, it can provide a reliable basis for maintenance and economic analysis. At the same time, introduce absorpted and innovated many advanced repairing technology. © 2013 American Society of Civil Engineers. Source

Dong J.,Tianjin Municipal Engineering Research Institute
Applied Mechanics and Materials | Year: 2012

The mechanical properties and toughening mechanism of basalt fiber reinforced concrete (BFRC) with different fibers proportion ranging from 0 to 2.5 kg/m3 were tested in the experiment. The results show that the basalt fiber has little effect on the compressive strength of BFRC, but it can improve the impact toughness of BFRC significantly. Taking impact toughness as criterion, BFRC with 0.36% basalt fiber would be the best choice. The energy absorption characteristic of BFRC with different fibers dosages increases by 1.4∼3.1 times than that of plain concrete when it is ultimately destroyed. Basalt fiber provides a secondary micro-reinforced system to BFRC when added into cement matrix. BFRC specimens show multi-cracking characteristics in the failure process, and the vice crack near the main crack is clearly observed while the final destruction. © (2012) Trans Tech Publications. Source

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