Research on the Relationship between Clay Content in Aggregate and Water Stability of Rubber Asphalt Mixture

2013 ◽  
Vol 639-640 ◽  
pp. 346-349
Author(s):  
Zhao Bin Xie
Keyword(s):  
Significant Influence ◽  
Asphalt Mixture ◽  
Clay Content ◽  
Water Stability ◽  
Test Results ◽  
Road Engineering ◽  
Stability Performance ◽  
Speed Up ◽  
The Relationship

In order to verify the characterization degree of water stability, research selects some clay content aggregate retrieved from road engineering field to produce rubber asphalt mixture and carry out the water stability test. Test results show that clay content in aggregate has a significant influence on the water stability of rubber asphalt mixture. When the content of clay in aggregate less than 1%, the influence on water stability is smaller; when the clay content exceeds 2%, the decay rate on water stability performance and long term properties obviously speed up, resulted in serious water damage.

Study on Water Stability of Warm Mix Drainage Asphalt with Sasobit

2013 ◽  
Vol 798-799 ◽  
pp. 178-181
Author(s):  
Jing Ya Chen ◽  
Kun Wang
Keyword(s):  
Polyester Fibre ◽  
Asphalt Mixture ◽  
Hydrated Lime ◽  
Water Stability ◽  
Test Results ◽  
Compaction Temperature ◽  
Porous Asphalt ◽  
Quick Lime ◽  
Stability Performance ◽  
Stability Order

To study water stability of Sasobit warm mix drainage asphalt (WMDA) and improve it, OGFC-13 WMA is primarily prepared with polyester fibre and Sasobit. According to the test results of specimens, formed at 5 different compaction temperatures by marshall tests, the optimal compaction temperature is determined. Then, general water stability tests were used to test the water stability performance of 4 kinds of asphalt mixtures, which were porous asphalt mixture of hot mix (OGFC-1),Sasobit WMDA without any anti-stripping agents (OGFC-2), Sasobit WMDA added hydrate lime (OGFC-3) and Sasobit WMDA added hydrated lime with quick lime (OGFC-4).Test results show that optimal compaction temperature is 150°C; water stability order (OGFC-3>OGFC-1>OGFC-2>OGFC-4) shows that using hydrated lime has beneficial yet limited effects to it. Hydrated lime with quick lime should be avoided for its adverse effect.1.5% hydrated lime shows best water stability.

Study on Water Stability of Evotherm® Warm Asphalt Mixture

2013 ◽  
Vol 753-755 ◽  
pp. 819-822
Author(s):  
Kui Li ◽  
De Dong Guo
Keyword(s):  
Asphalt Mixture ◽  
Hydrated Lime ◽  
Asphalt Mixtures ◽  
Water Stability ◽  
Test Results ◽  
Stability Tests ◽  
Compaction Temperature ◽  
Tracking Device ◽  
Wheel Tracking

AC-13C asphalt mixtures were mixing with 3% Evotherm® content and the optimal compaction temperature was determined according to test results of specimens formed at 4 different compaction temperatures by Marshall method. The general water stability tests and Hamburg wheel-tracking device (HWTD) were used to test the water stability of 4 kinds of asphalt mixtures, which were ordinary asphalt mixture, Evotherm® asphalt mixture without adding any anti-stripping agent, Evotherm® asphalt mixture adding liquid anti-stripping agent and Evotherm® asphalt mixture adding hydrated lime. Test results shows that the optimal compaction temperature is about 125°C; and compared to ordinary asphalt mixture, the long-term water stability of Evotherm® asphalt mixture is obviously poor caused by the lower compaction temperature; the addition of either liquid anti-stripping agent or hydrated lime improve the water stability to a great extent; comparatively speaking, addition of hydrated lime is the optimum measure to improve the water stability of Evotherm® warm mixture asphalt.

scholarly journals Evaluation of a Cold-Mixed High-Performance Polyurethane Mixture

2019 ◽  
Vol 2019 ◽  
pp. 1-12 ◽  
Author(s):  
Sun Min ◽  
Yufeng Bi ◽  
Mulian Zheng ◽  
Sai Chen ◽  
Jingjing Li
Keyword(s):  
Energy Consumption ◽  
High Performance ◽  
Greenhouse Gas Emission ◽  
Asphalt Mixture ◽  
Temperature Stability ◽  
Water Stability ◽  
High Temperature Stability ◽  
Forming Mechanism ◽  
And Performance

The energy consumption and greenhouse gas emission of asphalt pavement have become a very serious global problem. The high-temperature stability and durability of polyurethane (PU) are very good. It is studied as an alternative binder for asphalt recently. However, the strength-forming mechanism and the mixture structure of the PU mixture are different from the asphalt mixture. This work explored the design and performance evaluation of the PU mixture. The PU content of mixtures was determined by the creep slope (K), tensile strength ratios (TSR), immersion Cantabro loss (ICL), and the volume of air voids (VV) to ensure better water stability. The high- and low-temperature stability, water stability, dynamic mechanical property, and sustainability of the PU mixture were evaluated and compared with those of the stone matrix asphalt mixture (SMA). The test results showed that the dynamic stability and bending strain of the PU mixture were about 7.5 and 2.3 times of SMA. The adhesion level of PU and the basalt aggregate was one level greater than the limestone, and basalt aggregates were proposed to use in the PU mixture to improve water stability. Although the initial TSR and ICL of PU mixture were lower, the long-term values were higher; the PUM had better long-term water damage resistance. The dynamic modulus and phase angles (φ) of the PU mixture were much higher. The energy consumption and CO2 emission of the PU mixture were lower than those of SMA. Therefore, the cold-mixed PU mixture is a sustainable material with excellent performance and can be used as a substitute for asphalt mixture.

Properties of Porous Asphalt Mixture Made with Styrene Butadiene Styrene under Long Term Oven Ageing

2012 ◽  
Vol 486 ◽  
pp. 378-383 ◽  
Author(s):  
Che Wan Che Norazman ◽  
Ramadhansyah Putra Jaya ◽  
Meor Othman Hamzah
Keyword(s):  
Resilient Modulus ◽  
Asphalt Mixture ◽  
Test Results ◽  
Air Voids ◽  
Porous Asphalt ◽  
Coefficient Of Permeability ◽  
Modified Binder ◽  
Styrene Butadiene ◽  
Butadiene Styrene

Oven ageing is a set of procedure to simulate the accelerated effects of ageing on pavements structures. In this study, the effect of long-term oven ageing on porous asphalt mixture made with SBS modified binder was investigated. The resilient modulus, water permeability and air voids test results were the performance indicators used to evaluate the effects of ageing. The test results showed that, the resilient modulus of long term aged specimens was higher than those of unaged specimens. From the permeability test results, unaged SBS mixes exhibit lower coefficient permeability compared to the corresponding long-term oven age specimens. Most likely, ageing caused binder hardening, making the mix more difficult to compact and hence exhibited more continuous voids which in turn lead to higher permeability. In addition, the coefficient of permeability decreases as the binder content increased.

Application of Nano- TiO2 Used in Road Engineering and its Long-Term Decomposition Effect

2013 ◽  
Vol 662 ◽  
pp. 167-172 ◽  
Author(s):  
Xiao Lun Wang ◽  
Li Ping Liu ◽  
Hai Ming Xu
Keyword(s):  
Titanium Dioxide ◽  
Catalytic Effect ◽  
Asphalt Mixture ◽  
Catalytic Efficiency ◽  
Catalytic Decomposition ◽  
Uv Aging ◽  
Road Engineering ◽  
Nanometer Titanium Dioxide ◽  
Over Time

With the widely research of nano-TiO2, researchers have found another way of managing air quality. As an excellent photocatalyst material, nanometer titanium dioxide has begun to be used in road engineering in recent years. In this paper, substantial gas decomposition tests are performed utilizing the self-designed sealed container and UV aging box. At first, the catalytic efficiencies of nanometer titanium dioxide dispersed in silane solvent and in asphalt mixture were compared. The results show that nanometer titanium dioxide is able to decompose CO, HC and NO after being dispersed in silane solvent and asphalt mixture. To achieve the same catalytic efficiency, the amount of the nanometer titanium dioxide dispersed in silane solvent is much less than that in asphalt mixture. For asphalt mixture, high void fraction may mean high catalytic efficiency. Then the long-term decomposition of asphalt mixture was discussed. The asphalt mixture still has good catalytic decomposition effect after six months. The catalytic effect of asphalt mixture does not diminish over time and the effect of decomposing HC has improved after six months. At last, for cement paint, the catalytic effect of decomposing NO and HC does not diminish over time, but the effect of decomposing CO reduces.

scholarly journals Experimental Study On The Durability Of Hotmix Cold Laid Asbuton As Asphalt Porous with Cantabro Test

2018 ◽  
Author(s):  
SRIGUSTY ◽  
muhammad wihardi tjaronge ◽  
Rudy Djamaluddin
Keyword(s):  
Technology Development ◽  
Asphalt Mixture ◽  
Cold Temperature ◽  
Small Islands ◽  
Test Results ◽  
Road Engineering ◽  
Petroleum Asphalt ◽  
Natural Asphalt ◽  
Surrounding Areas ◽  
Rock Deposit

Natural Asphalt from Buton Island can be used as a substitute material for petroleum asphalt, which is known as asbuton. Asphalt Buton (Asbuton) is natural asphalt that contained in the rock deposit located in Buton Island and surrounding areas. Natural asphalt at the Buton Island (asbuton) has a huge deposit for a binder in asphalt mixture use. Many attempts have been carried out to improve the utilization of Buton asphalt as a binder in asphalt pavement road. One of them is the technology development of Buton asphalt pre-mix by adding fluxing materials (modifiers) that serves to soften the bitumen asbuton into the appropriate characteristics as a binder in the asphalt mixture. By adding the fluxing materials, asphalt mixture can be durable even spread and compacted at the cold temperature. This mixture is very useful in areas that have limited asphalt mixture production (AMP) such as in the isolated and small islands in Indonesia. In the pre-mixed Buton asphalt, the mixing is produced on the manufacturing asphalt mixing plant (AMP). After mixing, it can be stored or packaged, while rolling and compaction procces in the field can be performed at cold temperature. The test results of cantabro with the same level of 5.5% BGA and 3.5% flux oil showed that the mixture satisfy the requirements of the asphalt porous mixture according to REAM (Road Engineering Association of Malaysia), which is maximum of 20%.

scholarly journals The Impact of Oil Prices on the Economy of Vietnam

2015 ◽  
Vol 22 (04) ◽  
pp. 142-159
Author(s):  
Hoa Nguyen Thi Lien ◽  
Trang Tran Thu ◽  
Giang Nguyen Le Ngan
Keyword(s):  
Industrial Production ◽  
Oil Prices ◽  
Test Results ◽  
Macroeconomic Performance ◽  
Price Shocks ◽  
Short Term ◽  
Correction Model ◽  
The Impact ◽  
The Relationship

In this paper we study the relationship between oil prices and macroeconomic performance by investigating the impact of oil price shocks on key macroeconomic variables of Vietnam over the 2001–2012 period. In order to test the relationship between oil prices and the value of industrial production, we use cointegration method to consider the long-term relationship and Error Correction Model (ECM) to ponder the short-term one. The test results show that the price of oil and the value of industrial production in Vietnam are positively correlated in the long term, whereas in the short term the volatility of oil prices in the last two months will negatively affect the fluctuation in the value of the current industrial production.

scholarly journals THE RELATION OF ANXIETY AND KNOWLEDGE WITH LABOR READINESS IN COVID-19 PANDEMIC

2021 ◽  
Vol 5 (4) ◽  
pp. 349
Author(s):  
Ervina Puspa Wahyu Angesti ◽  
Nining Febriyana
Keyword(s):  
Pregnant Women ◽  
Sampling Technique ◽  
Anxiety Level ◽  
Test Results ◽  
Third Trimester ◽  
Cross Sectional ◽  
The Third ◽  
Cross Sectional Design ◽  
The Relationship

Background: 107,000 pregnant women in Indonesia experiencing anxiety while facing childbirth. A Research shows that anxiety is more experienced in Primigravida's pregnant women. Pregnant women anxiety can arise, especially in the third trimester until delivery. During the COVID-19 pandemic, pregnant women feel increasingly anxious because the virus spreads relatively easily. This study was aimed to analyze the relationship between the anxiety level and knowledge of pregnant women in the third trimester with readiness to face childbirth during the COVID-19 pandemic in Puskesmas Benowo and Tenggilis. Methods: This type of research was observational analytic with a cross-sectional design. The number of samples was 76 third trimester pregnant women suitable the criteria that is primigravida, physiologic pregnancy, not in a long-term medication and willing to be a respondent. The sampling technique was purposive sampling. The data was analyzed with Spearman’s Statistic test. Results: as many as 57.5% of respondents had severe anxiety with low readiness for childbirth and good knowledge of COVID-19. It was caused by the drug or vaccine for the Covid-19 that had not been found, and made pregnant women even more anxious and feared of something unwanted happening. Anxiety of pregnant women who were about to give birth greatly affected the readiness of the mother in preparing for childbirth, the more anxious pregnant women were, the less they would be prepared for laboring. The statistic analyze says that There was a relationship between the level of anxiety of third trimester pregnant women with readiness to give birth during the COVID-19 pandemic (p = 0.00), there was a relationship between the knowledge level with readiness to give birthd during the COVID-19 pandemic p = 0.012). Conclusion: There is a relationship between the Anxiety Level and Knowledge of Pregnant Women in the third trimester with Readiness for Childbirth during the COVID-19 Pandemic  

PENGARUH TATA RUANG KANTOR TERHADAP KINERJA KARYAWAN PADA PT. SUCOFINDO (PERSERO) MEDAN

2020 ◽  
Vol 9 (1) ◽  
pp. 49
Author(s):  
Iswandi Idris ◽  
Palti Raja Halomoan
Keyword(s):  
Significant Influence ◽  
Spatial Planning ◽  
Quantitative Research ◽  
Employee Performance ◽  
Secondary Data ◽  
Test Results ◽  
Consulting Services ◽  
Office Space ◽  
Certification Type ◽  
The Relationship

<p>Office Spatial Planning arrangement of office space and office preparation equipment and furniture on the floor area and office space available to offer facilities for workers. PT. Sucofindo (Persero) Medan Branch is a company engaged in consulting services, testing, providing training and providing certification services such as, ISO 9001: 2008 Certification. Type of quantitative research, with the type of data obtained from primary and secondary data, and research methods of data collection using interviews, observation, and questionnaires. Based on the research results of the relationship (correlation) the strongest indicator is Xi with Yi, namely R = 0.745 and the contribution contributed by 55.50%. The regression test results show that the most dominant indicator of the regression equation, Xi to Yi, is 0.962. And the t-test results show that the most dominant indicator is Xi against Yi, that is t count = 3.406 where t table 2.16 then t count 3.406&gt; t table 2.16 or in other words (Ha) accepted, meaning that there is a significant influence between Xi and Yi. Then the F Test results show that the most dominant indicator is Xi against Yi, namely F count = 16.196, where F table = 4.67, Ha accepted, meaning that there is a significant influence between Xi to Yi.</p><p><strong>Key words:</strong> Office Spatial Planning, Employee Performance, Multiple Linear Regression Tests</p>

Effect and its Mechanisms of Hydrated Lime on Water Stability of Hot Asphalt Mixture

2013 ◽  
Vol 842 ◽  
pp. 22-26
Author(s):  
Wen Feng Yang
Keyword(s):  
Asphalt Mixture ◽  
Hydrated Lime ◽  
Water Stability ◽  
Test Results

The mechanism that hydrated lime can improve water stability of asphalt mixture was analyzed through contrasting the performance of hydrated lime and ordinary limestone ore filler. The test results indicated that hydrated lime can obviously improve the water stability of asphalt mixture.

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