scholarly journals Development of a New Type of Green Switch Air Entraining Agent for Wet-Mix Shotcrete and Its Engineering Application

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Guoming Liu ◽  
Lianjun Chen
Keyword(s):  
Silicone Oil ◽  
Fresh Concrete ◽  
Engineering Application ◽  
First Grade ◽  
National Standard ◽  
Trimethyl Ammonium Chloride ◽  
Mix Proportion ◽  
New Type ◽  
Conventional Type ◽  
Optimal Mixing

Air entraining agent (AEA) can bring a lot of microbubbles into fresh concrete for improving its fluidity; however, high fluidity has adverse effect on the shootability of wet-mix shotcrete. In order to solve the contradictory issue, the paper developed a new type of green switch air entraining agent (GSAE) that can improve both the pumpability and shootability. The single-admixture and combination tests containing foaming ability and surface tension were performed with Deer agitator and automatic tension meter. The new AEA was developed with two constituents A and B. A was prepared withSapindus mukorossi(S-1), dodecyl trimethyl ammonium chloride(1231), and polyacrylamide. B was prepared with lauryl sodium sulfate (K12) and silicone oil. The mass mix proportion was S-1 : 1231 : polyacrylamide : K12 : silicone oil = 1 : 0.33 : 0.2 : 0.33 : 0.47. The application method of GSAE proposed that A was premixed with fresh concrete and then B was added at nozzle. Experimental investigation showed that the optimal mixing amount of GSAE was 0.1%–0.2% relative to cement. All performance measured of wet-mix shotcrete with 0.12% GSAE met the first-grade product requirements of the China National Standard. Compared with the conventional type of AEA, the proposed GSAE is capable of effectively improving pumpability and shootability.

scholarly journals Development of a New Type of Alkali-Free Liquid Accelerator for Wet Shotcrete in Coal Mine and Its Engineering Application

2015 ◽  
Vol 2015 ◽  
pp. 1-14 ◽  
Author(s):  
Gang Zhou ◽  
Weimin Cheng ◽  
Sen Cao
Keyword(s):  
Compressive Strength ◽  
Raw Materials ◽  
Setting Time ◽  
Engineering Application ◽  
First Grade ◽  
Dust Concentration ◽  
National Standard ◽  
Initial Setting Time ◽  
Initial Setting ◽  
New Type

In order to address issues such as large rebound rate, high dust concentration, and low compressive strength of shotcrete when adding liquid accelerator during wet spraying, the factors influencing the efficiency of liquid accelerator were experimentally analyzed. The single-admixture, combination, and orthogonal tests were conducted on the five fundamental raw materials required to develop the new liquid accelerator. The WT-1 type liquid accelerator, which had better adaptability to different kinds of cement, was developed with the mass concentration ratio of 55% aluminum sulfate octadecahydrate, 4% sodium fluoride, 2.5% triethanolamine, 0.5% polyacrylamide, 5% bentonite, and 33% water. Experimental investigation showed that the initial setting time of the reference cement with 6% mass content of this liquid accelerator was 2 minutes and 15 seconds, and the final setting time was 7 minutes and 5 seconds. The compressive strength after 1 day of curing was 13.6 MPa and the strength ratio after 28 days of curing was 94.8%, which met the first grade product requirements of the China National Standard. Compared with the conventional type liquid accelerator, the proposed type WT-1 accelerator is capable of effectively reducing the rebound rate and dust concentration while significantly increasing the compressive strength of the shotcrete.

The Performance Analysis of Calcium Silicate Composited Wall's Impact Resistance

2013 ◽  
Vol 671-674 ◽  
pp. 596-601
Author(s):  
Ming Ming Chen ◽  
Zhong Tao ◽  
Hen Min Zhang ◽  
Wen Zheng Yu
Keyword(s):  
Performance Analysis ◽  
Calcium Silicate ◽  
Impact Resistance ◽  
Engineering Application ◽  
National Standard ◽  
Minimum Standard ◽  
Impact Experiment ◽  
Interior Walls ◽  
The Impact

This paper introduces the impact experiment and an engineering application of the new composited wall which composed of calcium silicate composited board. Clearly defines the impact resistance of the wall in different connection as interior walls and exterior walls through observing the wall’s changes in the number of 5 times or even up to 50 times impact (10 times of the national standard). It can be known from the experiment that long wall has large vibration but good integrity. The window wall may fracture easily and is not able to meet the minimum standard requirements of impact resistance when the width is small. It needs to take reinforce measures.

scholarly journals Effects of temperature on interfacial evolution and mechanical properties of pure titanium and carbon steel sheets bonded via new multi-pass continuous hot-roll diffusion with nickel interlayer

2021 ◽  
Author(s):  
Chun-Ming Jimmy Lin ◽  
Mohsen Saboktakin Rizi ◽  
Chia-Kai Chen
Keyword(s):  
Mechanical Properties ◽  
Carbon Steel ◽  
Pure Titanium ◽  
Engineering Application ◽  
Peel Strength ◽  
Processing Temperature ◽  
Diffusion Treatment ◽  
Steel Sheets ◽  
New Type ◽  
Interfacial Evolution

Abstract This study performed experiments and thermodynamic calculations to elucidate the effects of diffusion temperature on interfacial evolution and mechanical properties of pure titanium and carbon steel (i.e., steel) sheets bonded via a new type of multi-pass continuous hot-roll diffusion with nickel interlayer. The interfacial evolution results revealed that this new type of multi-pass continuous hot-roll diffusion treatment showed a very good adherence due to its metallurgy bonding, because it made a remarked improve to between compound and intermetallic compounds relationship. Secondly, in mechanical properties results revealed that the highest shear strength (∼470 MPa) was obtained at a processing temperature of 850°C. The highest peel strength (∼21 N/mm) was obtained in the sample processed at 900°C. Bonding temperatures above and below these levels reduced the bond strength respectively due to poor atom diffusion and excessive compound formation, resulting in joint failure at the Ti-Ni interface. Extensive cleavage planes with various alignments were observed on the fracture surfaces in these cases. Overall, a hot-rolling temperature of 850°C was found to provide the optimal tradeoff between interfacial bonding strength and ductility. This work provided an economical and convenient solution for broadening the engineering application of interface between sheets of pure titanium and steel.

scholarly journals Damage Characteristics Analysis of the Truncated Cone-Shaped PELE Projectile

Symmetry ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 1025
Author(s):  
Liangliang Ding ◽  
Jingyuan Zhou ◽  
Wenhui Tang ◽  
Xianwen Ran
Keyword(s):  
Structural Parameters ◽  
Engineering Application ◽  
Damage Effect ◽  
Structural Shape ◽  
Damage Characteristics ◽  
Truncated Cone ◽  
Characteristics Analysis ◽  
Penetration Ability ◽  
New Type ◽  
After Effect

The PELE (penetrator with enhanced lateral efficiency) projectile is a new type of penetrator, which has both penetration and fragmentation effects. The damage characteristics of the PELE projectile have never been studied from the perspective of changing the shape of the projectile structure until now. This paper hopes to improve the damage power by changing the structural shape of PELE projectile, and the concept of a truncated cone-shaped PELE projectile is first put forward. In order to compare and analyze the damage power of the truncated cone-shaped PELE projectile and the conventional PELE projectile, six sets of simulation conditions were designed, and the penetration ability and fragmentation effect were used as the main evaluation indicators. According to the known structural parameters of the PELE projectile, the range of angle α of the truncated cone-shaped PELE projectile was determined to be 86.2°–90°. In addition, there is little difference in penetration ability between the two different types of PELE projectile; the damage effect of the truncated cone-shaped PELE projectile on the after-effect target is better than that of the conventional PELE projectile. It is hoped that through further structural optimization, the truncated cone-shaped PELE projectile will have more extensive engineering application value.

Research on Man-Machine Function Allocation of Tank Fire Control System

2012 ◽  
Vol 580 ◽  
pp. 160-164
Author(s):  
Tian Qing Chang ◽  
Dong Chen ◽  
Jun Wei Chen
Keyword(s):  
Control System ◽  
System Design ◽  
Engineering Application ◽  
Current Method ◽  
Control System Design ◽  
Fire Control ◽  
Working Mechanism ◽  
Level Of Automation ◽  
Function Allocation ◽  
New Type

Man-machine function allocation is an important step in new type tank fire control system design. Aiming at the problem of engineering application abilities deficiency in current method, a flow of function allocation is proposed. System working mechanism, functions and tasks are analyzed to define the level of automation and guide preliminary design. AHP is adopted to seek out the optimal plan. The method can offer new theory reference for intelligent tank fire control system design.

KENAF AS MATERIAL FOR LABORATORY TABLETOP

2015 ◽  
Vol 76 (9) ◽  
Author(s):  
Zuraidah Salleh ◽  
Syarifah Yunus ◽  
Mohamad Nor Berhan ◽  
Koay Mei Hyie ◽  
Anizah Kalam ◽  
...  
Keyword(s):  
Data Analysis ◽  
Impact Test ◽  
Polyester Resin ◽  
Engineering Application ◽  
Green Technology ◽  
Flexural Test ◽  
Kenaf Fiber ◽  
New Type ◽  
Weight Impact ◽  
Main Material

Nowadays, kenaf are gaining attention in the development and is used in many types of engineering application. This new type of composite also contribute towards the green technology making it favorable in various applications. This research is focused on making a laboratory tabletop by utilizing the unidirectional oriented kenaf fiber as the main material which is layered with woven fiberglass. The project methodology is divided into three sections; preparing the specimen, conducting the experiment and testing as well as data analysis. The mould that contains a layer of woven fiberglass and kenaf fiber were poured from a mixture of polyester resin and polyester hardener. The specimen was then compressed and left to dry  completely before further testing. Tensile test was carried out by following the ASTM D3039, ASTM D7264 standard for flexural test and ASTM D7136 for drop weight impact test. The results data obtained was found to be suitable for lightweight use only.

Calibration Tests of New Type Flow-Metering System by Ultrasonic Pulse-Doppler Profile-Velocimetry at National Standard Loops

2006 ◽  
Author(s):  
Michitsugu Mori ◽  
Kenichi Tezuka ◽  
Takeshi Suzuki ◽  
Mark Sapia ◽  
Edward Schrull ◽  
...  
Keyword(s):  
Ultrasonic Pulse ◽  
High Accuracy ◽  
National Standard ◽  
National Metrology Institute ◽  
Expanded Uncertainty ◽  
Flow Metering ◽  
Doppler Profile ◽  
Type Flow ◽  
New Type ◽  
Pulse Doppler

To verify high accuracy of a new type flow-metering system based on the measurements of line velocity profiles, eliminating Profile Factors, calibration tests of “UDF”, the flow-metering system by ultrasonic pulse-Doppler profile-velocimetry, were conducted at national standard loops worldwide, including the National Institute of Standard Technology (NIST) of the U.S. Department of Commerce, the National Metrology Institute of Japan (NMIJ) of the National Institute of Advanced Industrial Science and Technology (AIST) in Japan, the Nederlands Meetinstituut (NMI) in Netherlands, and the Centro National de Metrologia (CENAM) in Mexico. The deviations of UDF to the standard loops in the calibration tests for water were found between −0.23% and +0.26% at NIST, 0.1% and 0.4% at NMIJ, and −0.52% and +0.59% at NMI in terms of the average values of each measurement. Following improvements to the UDF System, the calibration tests at CENAM exhibited the deviations between −0.18% and +0.23% and the expanded uncertainty with ±0.21%.

Investigation of Effects of Baffle Configuration on the Performance of a Fixed-Cone Valve by Gas-Liquid Two-Phase Model

2012 ◽  
Vol 166-169 ◽  
pp. 1824-1829
Author(s):  
W.L. Wei ◽  
B. Lv ◽  
Y.L. Liu ◽  
X.F. Yang
Keyword(s):  
Numerical Simulation ◽  
Energy Dissipation ◽  
Turbulent Flow ◽  
Average Velocity ◽  
Simulation Method ◽  
Velocity Fields ◽  
Two Phase ◽  
Pressure Fields ◽  
New Type ◽  
Conventional Type

Nested type Fixed-Cone Valve, numerical simulation, energy dissipating, turbulent flow Abstract: In this paper, In this paper, a new type of Fixed-Cone Valve was proposed by improving the conventional type Fixed-Cone Valve .The flow fields of the two kinds of Fixed-Cone Valves were studied by using numerical simulation method .The computed pressure fields and the velocity fields were analyzed ,which shows that under the same conditions ,and by using the nested Fixed-Cone valve, the pressure of the upstream pipe and the cone valve and the average velocity along the downstream pipeline are reduced ,but the rate of energy dissipation is increased.

A Review of Stee-Polypropylene Hybrid Fiber Reinforced Concrete

2012 ◽  
Vol 238 ◽  
pp. 26-32 ◽  
Author(s):  
Xiao Ke Li ◽  
Li Sun ◽  
Y.Y. Zhou ◽  
Shun Bo Zhao
Keyword(s):  
Reinforced Concrete ◽  
Fresh Concrete ◽  
Strengthening Mechanism ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Hybrid Fiber ◽  
Mix Proportion ◽  
Macro Scale ◽  
Working Performance ◽  
Concrete Matrix

The steel-polypropylene hybrid fiber reinforced concrete can take full advantages of macro-scale crack resistance and toughening effect on the concrete matrix of steel and polypropylene fibers. The shortcomings of concrete are improved and there is a wide prospect application in engineering. This paper summarizes the enhancement theories of hybrid fiber reinforced concrete to explain its strengthening mechanism. The research status is reviewed including mix proportion design, working performance of fresh concrete, mechanical behaviors, durability (impermeability, shrinkage and others), and engineering applications etc. Some further researches are forecasted. It would be very useful to apply and popularize steel-polypropylene hybrid fiber reinforced concrete.

Coating Postponed-Set Mortar with a Single-Screw Extruder

2012 ◽  
Vol 530 ◽  
pp. 24-28
Author(s):  
Jian Hui Zhang ◽  
Xing Xing ◽  
Hua Feng Zhong
Keyword(s):  
Experimental Investigation ◽  
Prestressed Concrete ◽  
Engineering Application ◽  
Experimental Results ◽  
Type Material ◽  
Screw Extruder ◽  
Single Screw ◽  
Single Screw Extruder ◽  
New Type

Postponed-set mortar (PSM) is a new type material applied in prestressed concrete components. Successive coating a lay of PSM on prestressed strand is a key to engineering application. On the basis of experimental investigation, the model of PSM screw conveying is built by using the theories of rheology, and the flow for PSM in a single-screw coating machine is studied. The experimental results suggest that the Bingham plastic’s PSM can be conveyed by screw and coated on prestressed strand. It is achieved that PSM and polyethylene sheath is automatically and successively coated on prestressed strand only once by using the machine.

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