scholarly journals Study on Influencing Factors of Asphalt-Aggregate Stripping Mechanism

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Fuyu Wang ◽  
Yan Li ◽  
Liting Yu ◽  
Weichen Pang
Keyword(s):  
Diffusion Rate ◽  
Water Environment ◽  
Stress Generation ◽  
Test Results ◽  
Modified Asphalt ◽  
Electrochemical Testing ◽  
Before And After ◽  
Pressure Stress ◽  
Better Than ◽  
Asphalt Film

In order to study the stripping mechanism of asphalt aggregate comprehensively, the conditions of the stripping of asphalt aggregate are divided into two types, which are anhydrous environment and water environment. The stress generation and release of asphalt film under anhydrous environment and the differences in stripping mechanism of asphalt film under tensile and pressure stress were analyzed. The existence of water in the mixture and its harmfulness to stability were also described in this paper. Moreover, the transport behavior of water in asphalt was studied by the principles of electrochemical testing. The test results show that the diffusion rate of water in modified asphalt film is one half of that of base asphalt, so the blocking water ability of modified asphalt is better than that of matrix asphalt. Moreover, the condition of water spalling the asphalt-aggregate interface is characterized by a change in the mass of asphalt film before and after boiling. It can be concluded that the mass loss of asphalt film is minimal with limestone and modified asphalt, which shows that it has the best spalling resistance.

The Study of Anti-UV and Anti-Solarization of Strength Synthetic Fiber

2012 ◽  
Vol 573-574 ◽  
pp. 1224-1229
Author(s):  
Hai Yan Ni ◽  
Ying Jin Gan ◽  
Jin Ti You
Keyword(s):  
Fiber Bundle ◽  
Performance Test ◽  
High Strength ◽  
Uv Protection ◽  
National Standards ◽  
Synthetic Fiber ◽  
Test Results ◽  
Before And After ◽  
The Difference ◽  
Better Than

In view of anti-UV of the high strength synthetic fiber hoisting belt, the researcher compared the effects on anti-ultraviolet of SCJ-966 and HTUV100,through before and after intensity test and the test of Anti-solarization performance,then comparing with tests of fiber bundle strength,the reacher analyzed the effect of anti-UV and the difference on intensity.The result shows that:two UV performance are very good, far more than the European and national standards,and the webbing performance test results show that the UV protection of SCJ-966 UV protection is better than HTUV100, but the intensity rate is the former smaller than the latter, the extent damage of hoisting belt is the latter worse than the former.

scholarly journals Experimental Study on Solidification of Pb2+ in Fly Ash-Based Geopolymers

2021 ◽  
Vol 13 (22) ◽  
pp. 12621
Author(s):  
Fang Liu ◽  
Ran Tang ◽  
Baomin Wang ◽  
Xiaosa Yuan
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Fly Ash ◽  
Heavy Metal Ions ◽  
Test Results ◽  
Good Resistance ◽  
Domestic Waste ◽  
Before And After ◽  
Better Than ◽  
Solidified Body

Fly ash from the incineration of domestic waste contains heavy metals, which is harmful to the environment. To reduce and prevent their contamination, heavy metal ions need to be sequestered. In this study, the geopolymer prepared by fly ash, a kind of power plant waste, is used to cure the heavy metal Pb2+, and to investigate the effect of different concentrations of Pb2+ on the compressive strength of the solidified body at different ages; the curing effect is judged by the toxic leaching concentration of heavy metals; the resistance of the solidified body to immersion is evaluated by comparing the change in strength before and after leaching; the fly ash-based geopolymer solidified body is compared with the cement solidified body in terms of curing effectiveness; the properties of the geopolymer and its mechanism of curing heavy metals are explored by microscopic tests. The results show that the fly ash-based geopolymer solidified body has good resistance to immersion; the optimum curing concentration of Pb2+ in fly ash-based geopolymers is 2.0%; compared to pure geopolymers, the strength of the solidified body at 28 d decreases by only 13.0%, and the leaching concentration of Pb2+ is 4.73 mg·L−1, which meets the specification requirements; the curing effect of the fly ash-based geopolymer is better than the cement solidified body; the microscopic test results indicate that the curing of Pb2+ by the fly ash-based geopolymer is a combination of both chemical bonding and physical fixation.

Effect of Raw Material’s Properties to HMA’s Pavement Performance

2013 ◽  
Vol 738 ◽  
pp. 149-152
Author(s):  
Zhuo Hong Cong ◽  
Nan Xiang Zheng
Keyword(s):  
Low Temperature ◽  
Coarse Aggregate ◽  
Pavement Performance ◽  
Water Stability ◽  
Fine Aggregate ◽  
Test Results ◽  
Modified Asphalt ◽  
Asphalt Content ◽  
Better Than

In order to study the effect of the raw material’s properties to the HMA’s pavement performance, the asphalt, coarse aggregate and fine aggregate are studied. The test results show that: the modified asphalt content is more than the base asphalt with the same aggregate and gradation. The former’s pavement performance is obviously better than the latter’s. The granite mixture’s asphalt content is less than the gabbro mixture. Their high and low temperature performances are in the same level, but the former’s water stability is worse.

scholarly journals Micro/Nanoscale Study on the Effect of Aging on the Performance of Crumb Rubber Modified Asphalt

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Lan Wang ◽  
Yang Liu ◽  
Le Zhang
Keyword(s):  
Molecular Dynamics ◽  
Crumb Rubber ◽  
Dynamics Simulation ◽  
Surface Microstructure ◽  
Test Results ◽  
Force Microscopy ◽  
Modified Asphalt ◽  
Atomic Force ◽  
Before And After ◽  
Microscopic Surface

In order to explore the variation of crumb rubber modified asphalt (CR) before and after aging at the micro- and nanoscales, the molecular dynamics simulation and atomic force microscopy (AFM) asphalt microstructure scanning were carried out on CR before and after aging. The molecular dynamics energy, radial distribution function (RDF), surface microstructure image, roughness, and other test results of the CR before and after aging were compared and analyzed. The results show that the molecular dynamic energy of the CR after aging increases; the asphaltene-asphaltene RDF is decreased after aging; and the AFM surface microstructure images of asphalt before and after aging do not change significantly, but quantitative analysis by roughness theory shows that aging makes the microscopic surface of the CR more uniform and gentle. By analyzing the changes of asphalt properties before and after aging at two scales, it can be found that there is a certain relationship between the properties obtained at different scales. The reasons and mechanisms for the influence of microstructure on aging are obtained by analyzing this relationship.

scholarly journals Analysis Study of The Comparative Quality of Patient Services Before and After Covid-19 Pandemic in Installation of Siloam Hospital TB Simatupang Installation

2020 ◽  
Author(s):  
Dian Agnesa Sembiring ◽  
◽  
Atik Nurwahyuni ◽  
Wahyu Sulistiadi ◽  
◽  
...  
Keyword(s):  
Service Quality ◽  
Test Reliability ◽  
Quality Of Services ◽  
Test Results ◽  
Five Dimensions ◽  
Before And After ◽  
Patient Service ◽  
Better Than ◽  
Urgent Action

ABSTRACT Background: In the COVID-19 (Coronavirus Disease 2019) pandemic crisis that has hit Indonesia since early March 2020, urgent action is needed to overcome the situation while maintaining and improving relationships with customers so that they are still satisfied with the quality of services in hospitals, especially inpatient services. Since the COVID-19 pandemic, there has been a significant decrease in the number of inpatient visits at Siloam Hospitals TB Simatupang. This study aimed to analyze the comparison of the level of quality of patient service before and after the COVID-19 pandemic in installation of Siloam hospital TB Simatupang installation. Subjects and Method: This was a descriptive observational study conducted at Siloam Hospitals TB Simatupang from September 2020. A sample of 88 patients was selected by purposive sampling. The data was collected by questionnaire. The operationalization of this research variable is service quality, which is measured from five dimensions, namely Tangibles, Reliability, Responsiveness, Assurance, and Empathy. The data analysis used a series of tests such as validity test, reliability test, descriptive statistics and independent sample T-test. Results: During the COVID-19 pandemic, patients had a better perception than before the COVID-19 pandemic, it can be seen from service quality (Mean= 4.11), while during the COVID-19 pandemic (Mean= 4.250). Conclusion: Quality of services provided in outpatient installations during the COVID-19 pandemic is better than before the COVID-19. Keywords: service quality, COVID-19, outpatient Correspondence: Dian Agnesa Sembiring. Magister Program in Hospital Administration. Faculty of Public Health, University of Indonesia, Depok, West Java. Email: [email protected] DOI: https://doi.org/10.26911/the7thicph.04.23

scholarly journals Rheological Properties of Graphene Modified Asphalt Binders

Nanomaterials ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 2197
Author(s):  
Lu Yang ◽  
Dunhong Zhou ◽  
Yang Kang
Keyword(s):  
Asphalt Concrete ◽  
Low Cost ◽  
Asphalt Binders ◽  
Test Results ◽  
Complex Moduli ◽  
Ambient Temperatures ◽  
Modified Asphalt ◽  
Before And After ◽  
Operating Temperatures ◽  
Rheological Experiments

Recently, low-cost, high-quality graphene can be obtained readily, so it is potential to prepare conductive graphene modified asphalts (GMAs). In this paper, GMAs were prepared with 0%, 2%, 4%, 6%, 8%, and 10% of graphene by weight of composites. Dynamic shear rheological experiments conducted from −30 to 120 °C illustrate that elasticity at above ambient temperatures and rutting resistance at higher temperatures are enhanced and, especially, the conceived percolation of GMAs occurs at graphene contents (GC) above 8% which were verified from three changes as GC increases, i.e., the curve characteristics of complex moduli, storage moduli at temperatures over 100 °C, temperatures when the phase angle reaches 90° and the trend of TG′=G″. The modification mechanisms are different before and after percolation. Before the percolation threshold, graphene which has a molecular structure similar to asphaltene enhances asphalt, like increasing asphaltene components, and after threshold, graphene improves asphalt because of the formed graphene networks. Rotational viscosities test results show that the higher the GC is, the higher the operating temperatures are, but the operating temperatures are higher than 200 °C when GC is above 4%. The percolation helps to further develop conductive asphalt concrete for intelligence pavement, but the operating properties of GMAs need to be improved.

scholarly journals Comparison of ATP values on Vegetables Cutting Boards before and after Alcohol Disinfection

2020 ◽  
pp. 13-18
Author(s):  
Naomi Katayama ◽  
Akemi Ito ◽  
Mayumi Hirabayashi ◽  
Natuki Sasaki ◽  
Moe Inuzuka
Keyword(s):  
Room Temperature ◽  
Food Poisoning ◽  
Test Results ◽  
Microbiological Test ◽  
Before And After ◽  
Cutting Boards ◽  
Better Than

Sanitary control of cutting boards in the kitchen is important to prevent food poisoning. To preventing secondary and tertiary contamination of food poisoning bacteria, it is necessary to know the hygiene status of cooking utensils. Therefore, in this study, we compared the values after cooking, washing, and spraying 70% alcohol on cutting boards for vegetables using the ATP test and microbiological test. As a result, the ATP value after spraying with alcohol was 100 or less, which was better than that after washing. Microbial test results showed that microorganisms were present on the vegetable cutting board even after spraying with 70% alcohol. Since microorganisms are present even after spraying with alcohol, it is possible that the growth of microorganisms will occur again if the vegetable cutting board left in a moist state at room temperature. When using a vegetable cutting board left unattended, it is necessary to wash repeatedly and spray it with alcohol.

Kepuasan Masyarakat Terhadap Pelayanan Kelurahan Setelah Pemekaran Di Tangerang Selatan

Liquidity ◽  
2018 ◽  
Vol 2 (2) ◽  
pp. 151-159
Author(s):  
Pitri Yandri
Keyword(s):  
Public Perception ◽  
Service Personnel ◽  
Urban Services ◽  
Hospitality Workers ◽  
Care Workers ◽  
Before And After ◽  
Cartesian Diagram ◽  
Better Than

The purpose of this study is (1) to analyze public perception on urban services before and after the expansion of the region, (2) analyze the level of people's satisfaction with urban services, and (3) analyze the determinants of the variables that determine what level of people's satisfaction urban services. This study concluded that first, after the expansion, the quality of urban services in South Tangerang City is better than before. Secondly, however, public satisfaction with the services only reached 48.53% (poor scale). Third, by using a Cartesian Diagram, the second priority that must be addressed are: (1) clarity of service personnel, (2) the discipline of service personnel, (3) responsibility for care workers; (4) the speed of service, (5) the ability of officers services, (6) obtain justice services, and (7) the courtesy and hospitality workers.

Implementasi Voip Server Berbasis IPV6 Dengan Raspberry PI

2019 ◽  
Vol 9 (01) ◽  
pp. 47-54
Author(s):  
Rabbai San Arif ◽  
Yuli Fitrisia ◽  
Agus Urip Ari Wibowo
Keyword(s):  
Internet Protocol ◽  
Wireless Transmission ◽  
Raspberry Pi ◽  
Test Results ◽  
Average Delay ◽  
Ipv6 Network ◽  
Ip Network ◽  
Selection Of ◽  
Better Than

Voice over Internet Protocol (VoIP) is a telecommunications technology that is able to pass the communication service in Internet Protocol networks so as to allow communicating between users in an IP network. However VoIP technology still has weakness in the Quality of Service (QoS). VOPI weaknesses is affected by the selection of the physical servers used. In this research, VoIP is configured on Linux operating system with Asterisk as VoIP application server and integrated on a Raspberry Pi by using wired and wireless network as the transmission medium. Because of depletion of IPv4 capacity that can be used on the network, it needs to be applied to VoIP system using the IPv6 network protocol with supports devices. The test results by using a wired transmission medium that has obtained are the average delay is 117.851 ms, jitter is 5.796 ms, packet loss is 0.38%, throughput is 962.861 kbps, 8.33% of CPU usage and 59.33% of memory usage. The analysis shows that the wired transmission media is better than the wireless transmission media and wireless-wired.

Sunlight exposure: the effects on the performance of paragliding fabric

2018 ◽  
Vol 69 (05) ◽  
pp. 381-389
Author(s):  
MENGÜÇ GAMZE SÜPÜREN ◽  
TEMEL EMRAH ◽  
BOZDOĞAN FARUK
Keyword(s):  
Mechanical Properties ◽  
Aging Process ◽  
Air Permeability ◽  
Sunlight Exposure ◽  
Test Results ◽  
Coating Materials ◽  
Strength Tests ◽  
Before And After ◽  
The Relationship ◽  
Dark Blue

This study was designed to explore the relationship between sunlight exposure and the mechanical properties of paragliding fabrics which have different colors, densities, yarn counts, and coating materials. This study exposed 5 different colors of paragliding fabrics (red, turquoise, dark blue, orange, and white) to intense sunlight for 150 hours during the summer from 9:00 a.m. to 3:00 p.m. for 5 days a week for 5 weeks. Before and after the UV radiation aging process, the air permeability, tensile strength, tear strength, and bursting strength tests were performed. Test results were also evaluated using statistical methods. According to the results, the fading of the turquoise fabric was found to be the highest among the studied fabrics. It was determined that there is a significant decrease in the mechanical properties of the fabrics after sunlight exposure. After aging, the fabrics become considerably weaker in the case of mechanical properties due to the degradation in both the dyestuff and macromolecular structure of the fiber

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