Coal SJC, coal WJG, ZJM, and HCG were selected to investigate the pyrolysis kinetics of northern Shaanxi coals. TG DSC experiments four coals carried out with a synchronous thermal analyzer at heating rates 5, 10, 15, 20 C/min, respectively. The characteristics described by thermogravimetric data, kinetic parameters calculated Flynn–Wall–Ozawa (FWO), Kissinger, general integration, MacCallum–Tanner methods. results show that all conform reaction series equation, decomposition rate is...

AbstractEngineered cementitious composites (ECCs) have recently demonstrated excellent mechanical performances in civil engineering, thanks to their significant strain hardening behaviour under tension. As a new class of cement based composite materials, green high performance fibre reinforced (GHPFRCCs) the optimised mixing proportion ECC with volume fly ash on orthogonal experiment method. In this study, flexural toughness GHPFRCC was carefully examined by inspecting influences content,...

The tensile strength and ductility of normal concrete are dissatisfactory these lead to some durability problems for reinforced structure. On the other hand, China’s production consumption is largest in world, with rapid economic development number also continue increase. A new class more sustainable cement-based materials urgently needed China. This paper reports on engineering cementitious composites (ECC), a unique green high-performance fiber-reinforced composite (GHPFRCC) high volumes...

The surface membrane plays a vital role in bearing loads of flexible inflatable composites. In this work, the mechanical properties upper and lower surfaces composites spacer fabrics were studied. It focused on changes with different structures after coating damage characteristics. results show that PVC resin improves surface, which penetrates into structure to make yarns bond each other adhere surface. And compared knitted structures, composite membranes woven have characteristics specific...

Li, X.; Luo, M., and Yan, Q., 2015. Influence of specimen shape mix proportion on tensile property green high performance fiber reinforced cementitious composites (GHPFRCC).This paper investigates the (GHPFRCC) with focus influence sample proportion. Direct tests are performed rectangle shaped plate coupons dumbbell ones, followed by sixteen kinds proportions based orthogonal experiment method, considering such influencing factors as fly ash replacement weight (60%, 65%, 70%, 75%),...

Abstract Green high performance fiber reinforced cementitious composites (GHPFRCC) are a new class of sustainable composites, employing volume fly ash to replace cement. In addition increasing the sustainability construction environment, GHPFRCC exhibits tensile ductility and multiple cracking behaviors in strainhardening state. These materials can effectively improve structural energy dissipation capacity durability. this study, optimum mixture ratio is presented established using an...

In China, the length of power cable tunnel exceeds 13,500 km and more than 80% lines rated voltage from 110 kV up to 500 were installed in tunnel. Research development smart telemonitor system for controlling managing real time is emergency necessary because HV EHV are so important main network. The system, which has been put into operation Beijing Power Corporation since 2007, was integrated Command Center, it four representative characters, i.e. information or data transmission, command...

“Strong column and weak beam” failure rarely occurred in the Wenchuan earthquake, reasons were analyzed this paper. A new type of frame is presented, i.e. green high-performance fiber-reinforced cementitious composites (GHPFRCC) column, seismic behaviors are discussed. And structural member vital to improve capacity structure.

Green high performance fiber reinforced cementitious composites (GHPFRCC) is a new class of Engineered Cementitious Composites (ECC) with volume fly ash based on the orthogonal experimental method. Focus placed flexural failure properties GHPFRCC, considering influences factors like content, water-binder ratio, sand-binder PVA (Polyvinyl Alcohol) and water reducing agent, et al. The results indicate that process GHPFRCC beam can be divided into three stages including elastic stage, yield...

On the basis of consulting data, bearing mechanism gravel pile composite foundation is analyzed in this paper. The use ANSYS software under flexible according to plum blossoms additional stress between and soil distribution, load on top rate modulus ratio capacity, pile-soil effect was calculated analyzed, providing reasonable design reference for foundation.

Multi-field coupling system in the paper is composed of corroded pipelines, fluid, heat preservation layers and frost -heaving soil, buried pipelines are inevitable to be affected by earthquakes, but few studies have been done on multi-field under seismic loading cold regions. The analyzes dynamic response loading. Method FEM (finite element method), three-dimensional mechanics model has established for analysis, based a thermal-fluid-solid analysis theory, considering actual stress-strain...

Abstract The computational accuracy of concrete prediction models is the key to investigate shrinkage influence on performance structure. Commonly used are evaluated for their by comparing predicted results against six groups test data that collected from published papers. show were not coincided very well with experimental data. phenomenon a result several interacting physical mechanisms and influenced many variable factors. deformations invariably exhibit large statistical scatter....

In the low-temperature dry distillation of low-rank coal, important liquid product coal tar is produced, but its quality and utilization rate are degraded by entrained dust. The movement dust in furnace a key factor causing particles such as to mix with tar. Therefore, Euler–Lagrangian method used simulate two-phase motion process gas, tar, furnace. By considering effects particle size, gas velocity, density, mechanism revealed, enabling content be reduced improved. results indicate that...

The determination of post-tensioning cable forces is one the most important issues for design arch pylon stayed bridge. In this paper, optimization module implemented in MATLB, together with commercial finite element software MIDAS, were employed to evaluate minimum bending strain energy After optimizing forces, moment pylons bigger than values original design. main within 55m 70m height increased by 7280 kN•m, and auxiliary 30m 60m 3926 kN•m .The stress was still far below allowance value...

Water lubricated bearings differ from water in its special choice of material. A novelty material developed with an aim to improve the lubricating performance and bearing capacity, BTG plastic alloy is based on latex material, synthesized different fillings, accelerators other matters, displays great mechanical friction properties. In order expand application field lubrication, a bettered formula was adopted aspects vulcanization, reinforced filling softened plastification systems property....

In this paper, the operation life, electrical and mechanical characters of aging silicone rubber composite insulators as well phenomena these caused by natural multi-factors were researched analyzed based on surface physical examination including electronic-microscope scan inspection, etc., insulation tests power frequency voltage test, impulse etc,. According to results research analysis, residual safe life may be evaluated in paper. Comparing with 20 years theoretical operating insulators,...

The anti-sliding performance of cement concrete runway in airport is studied by means different groove parameters. results show that direction, slot spacing, width, section and depth can influence the runway.

This paper investigated preparation process of briquette by using starch and bentonite as composite binder. It also studied the impact pulverized coal particle size, coking compacting pressures, moisture content on strength form coke. The result showed that size was main influence factor. And optimum conditions molding were follows: low rank less than 0.63mm, 0.28mm, pressure 60 kN, 12%. Under optimal conditions, compressive coke 3470 N/ball 2910 N/ball, respectively.