scholarly journals Effects of Selected Warm Mix Asphalt Additives on Viscosity Properties of Binder

2018 ◽  
Vol 1 (1) ◽  
pp. 80-84
Author(s):  
Bekir Aktas ◽  
Şuayıp Aytekin ◽  
Şevket Aslan
Keyword(s):  
Energy Consumption ◽  
Lower Energy ◽  
Asphalt Mixture ◽  
Warm Mix Asphalt ◽  
Asphalt Mixtures ◽  
Energy Costs ◽  
Great Effort ◽  
Rotational Viscometer ◽  
Production Temperature ◽  
Emission Ratios

Asphalt industry has spent great effort to reduce mixing and compaction temperatures of the asphalt mixture because of increasing emission ratios and energy costs. The production of Warm Mix Asphalt (WMA) is related to attaining proper viscosity value of the binder to increase aggregate-binder bonding and compaction of the mixture at lower temperatures. The most important advantages of WMA are lower energy consumption and less pollution. Generally, the production temperature of the asphalt mixture depends on the asphalt properties. In this study, effects of selected warm mix asphalt additives of a certain amount by weight are investigated in terms of viscosity in a Brookfield Rotational Viscometer. The reducing viscosity of the binders will increase production and compaction ability of the mixtures. Also, it will allow to reduce mixing and compaction temperature. Therefore, with the decreased cooling rate asphalt mixtures can haul longer distances and give more time for site construction. The findings of this study show that under the same rotational speed viscosity decreases when additives are used.

scholarly journals Volumetric characteristics and compactability of asphalt rubber mixtures with organic warm mix asphalt additives

2017 ◽  
Vol 67 (327) ◽  
pp. 123 ◽  
Author(s):  
A. M. Rodríguez-Alloza ◽  
J. Gallego
Keyword(s):  
Energy Consumption ◽  
Lower Energy ◽  
Laboratory Tests ◽  
Waste Product ◽  
Road Construction ◽  
Warm Mix Asphalt ◽  
Asphalt Mixtures ◽  
Organic Additives ◽  
Asphalt Rubber ◽  
Volumetric Characteristics

Warm Mix Asphalt (WMA) refers to technologies that reduce manufacturing and compaction temperatures of asphalt mixtures allowing lower energy consumption and reducing greenhouse gas emissions from asphalt plants. These benefits, combined with the effective reuse of a solid waste product, make asphalt rubber (AR) mixtures with WMA additives an excellent environmentally-friendly material for road construction. The effect of WMA additives on rubberized mixtures has not yet been established in detail and the lower mixing/compaction temperatures of these mixtures may result in insufficient compaction. In this sense, the present study uses a series of laboratory tests to evaluate the volumetric characteristics and compactability of AR mixtures with organic additives when production/compaction temperatures are decreased. The results of this study indicate that the additives selected can decrease the mixing/compaction temperatures without compromising the volumetric characteristics and compactability.

scholarly journals LABORATORY INVESTIGATION OF COAL BOTTOM ASH MODIFIED WARM MIX ASPHALT

2021 ◽  
Vol 83 (4) ◽  
pp. 63-74
Author(s):  
Zulfiqar Ali Jattak ◽  
Norhidayah Abdul Hassan ◽  
Mohd Khairul Idham Mohd Satar ◽  
Ramadhansyah Putra Jaya ◽  
‪Mohd Rosli Hainin
Keyword(s):  
Coal Combustion ◽  
Bottom Ash ◽  
Asphalt Mixture ◽  
Warm Mix Asphalt ◽  
Asphalt Mixtures ◽  
Mix Design ◽  
Chemical Additives ◽  
Air Voids ◽  
Production Temperature ◽  
Marshall Stability

Bottom Ash (BA), a coal combustion by-product, found to be a potential material when used to produce asphalt mixture. However, some of its characteristics make it a questionable material for the surface course. Therefore, this study aims to evaluate the compatibility of BA in Warm Mix Asphalt (WMA) technology through the basic mechanical properties of the asphalt mixtures for binder course layer (AC 28). Two WMA chemical additives, Cecabase RT and Evotherm 3G, were used at the concentrations of 0.3, 0.4 and 0.5% from the binder's weight. The binder properties were assessed through penetration, softening point and viscosity tests. The Marshall mix design was used to determine the optimum binder content (OBC). The additive dosage and production temperature for WMA were determined through Marshall stability, flow, air voids and specific gravity. The results show that the additives did not significantly affect the binder properties, although, at 0.4% Evotherm 3G, a drop of 17.5% in penetration was observed. Cecabase RT produced WMA with promising results but did not enhance the workability of WMA containing bottom ash (BAWMA). By lowering the production temperature of 25 °C, WMA and BAWMA at 0.4 %, Evotherm 3G demonstrated comparable workability to the conventional Hot Mix Asphalt (HMA). The data achieved through this study would be a guiding approach towards the application of BA in WMA technology for sustainable pavements.

Application of diluted methanol to allow the production of latex modified asphalt mixture with lower energy consumption

2020 ◽  
Vol 262 ◽  
pp. 120028
Author(s):  
Muhammad Khuzaimi Aziz ◽  
Mohd Rosli Mohd Hasan ◽  
Sharvin Poovaneshvaran ◽  
Guo Tai ◽  
Hainian Wang
Keyword(s):  
Energy Consumption ◽  
Lower Energy ◽  
Asphalt Mixture ◽  
Modified Asphalt

scholarly journals Performance Evaluation of Warm- and Hot-Mix Asphalt Mixtures Based on Laboratory and Accelerated Pavement Tests

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Yongjoo Kim ◽  
Jaejun Lee ◽  
Cheolmin Baek ◽  
Sunglin Yang ◽  
Sooahn Kwon ◽  
...  
Keyword(s):  
Asphalt Mixture ◽  
Warm Mix Asphalt ◽  
Strength Test ◽  
Asphalt Mixtures ◽  
Limited Data ◽  
Tensile Strength Test ◽  
Paving Asphalt ◽  
Dynamic Modulus Test ◽  
Indirect Tensile ◽  
Lower Temperature

A number of warm-mix asphalt (WMA) technologies are used to reduce the temperature at which the asphalt mixtures are produced and compacted, apparently without compromising the performance of the pavement. The main objective of this study is to determine whether the use of an innovative wax-based LEADCAP WMA additive influences the performance of the asphalt mixture, which is produced and compacted at significantly low temperatures. The WMA pavement using LEADCAP additive (WMA-LEADCAP) along with a control HMA pavement was evaluated with respect to their performances of rutting resistance, crack resistance, and viscoelastic property based on the laboratory dynamic modulus test, indirect tensile strength test, and in-door accelerated pavement test (APT) results. With the limited data carried out, the LEADCAP additive is effective in producing and paving asphalt mixture at approximately 30°C lower temperature than a control HMA mixture, and the performances of WMA-LEADCAP pavement are comparable to a control HMA pavement.

scholarly journals EXPLORING THE EFFECT OF ORGANIC ADDITIVES ON PHYSICAL PROPERTIES OF BITUMEN

2021 ◽  
Vol 12 (23) ◽  
pp. 49-60
Author(s):  
Noor M. Asmael ◽  
◽  
Mohammed Y. Fattah ◽  
Abdalmhiman Kadhim ◽  
◽  
...  
Keyword(s):  
Positive Impact ◽  
Asphalt Mixture ◽  
Viscosity Reduction ◽  
Organic Additives ◽  
Rotational Viscometer ◽  
Different Temperatures ◽  
Production Temperature ◽  
Odour Emissions ◽  
Warm Additives ◽  
Foaming Technology

Warm additives had wide popularity in recent years due to saving in energy and lowering emissions dealt with asphalt mixture production. Warm Mix Asphalt (WMA) is produced by using foaming technology or reducing -viscosity additives of binder to enhance the rheological properties. In this study, organic-based additives (Asphaltan A and Asphaltan B) are used to investigate their effect to minimize the viscosity and lower the temperature of asphalt mixture production. Bitumen is mixed with three doses of each additive: 1, 2, and 3% of its weight. The binder viscosity was measured by rotational viscometer with and without the additives at three different temperatures. The study showed that the organic additives have a positive impact on the behavior of the binder in terms of viscosity reduction and made enhancements in terms of bitumen properties. This result could be useful in the reduction of production temperature and quantity of odour emissions.

scholarly journals Evaluation of the Potential of Sasobit REDUX Additive to Lower Warm-Mix Asphalt Production Temperature

Materials ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1285 ◽  
Author(s):  
Arminda Almeida ◽  
Michela Sergio
Keyword(s):  
Construction Industry ◽  
Road Construction ◽  
Warm Mix Asphalt ◽  
Asphalt Mixtures ◽  
Asphalt Production ◽  
Air Voids ◽  
Health Concerns ◽  
The Road ◽  
Wide Range ◽  
Production Temperature

Environmental and health concerns have been increasing in the road construction industry. This industry has provided several techniques and a wide range of additives to lower the production temperatures of asphalt mixtures, generating, among others, a new mix type called warm-mix asphalt (WMA). This paper aims to evaluate the potential of the Sasobit REDUX additive to lower the production temperatures of WMA. This additive, which is an alternative to the well-known Sasobit, is completely soluble in bitumen at temperatures above 85 °C while the same temperature for the Sasobit is 115 °C. For that reason, three target compaction temperatures were considered (90, 100 and 110 °C) and both Marshall and compactability tests were carried out. A hot-mix asphalt (HMA) was tested in parallel for comparison. It was concluded that the volumetric properties (air voids content about 4%) and the Marshall properties (stability about 11 kN, flow about 4 mm and Marshall quotient higher than 2 kN/km) of the Sasobit REDUX-WMA were globally satisfactory. In relation to the compactability test, the Sasobit REDUX-WMA mixtures were relatively easier to be compacted compared to the HMA mixture. The three Sasobit REDUX-WMA mixtures (90, 100 and 110 °C) exhibited a very similar compactability (differences lower than 0.4%). Therefore, it seems reasonable to conclude that the Sasobit REDUX has potential to lower WMA production temperatures by 20 °C. A reduction of that magnitude would lead to significant environmental gains.

Research on Performance of SAP Warm Mix Asphalt Additive

2013 ◽  
Vol 446-447 ◽  
pp. 1429-1435
Author(s):  
Jin Xi Zhang ◽  
Kai Mu ◽  
Wen Tao Wang
Keyword(s):  
Void Ratio ◽  
Operating Temperature ◽  
Asphalt Mixture ◽  
Warm Mix Asphalt ◽  
Asphalt Mixtures ◽  
Ratio Method ◽  
Test Accuracy ◽  
Viscosity Method ◽  
Engineering Applications ◽  
Molding Temperature

A kind of new warm mix additive called SAP was proposed in this paper. The principle is using foam to lower the operating temperature of asphalt mixtures. The mixing and molding temperature of SAP warm mix asphalt mixture were measured by viscosity method and void ratio method, which are almost 20°C lower than that of HMA. Considering the engineering applications and test accuracy, the void ratio method is considered to be the better way to measure the operating temperature of asphalt mixtures.

scholarly journals Void Distribution in Zeolite Warm Mix Asphalt Mixture Based on X-ray Computed Tomography

Materials ◽  
2019 ◽  
Vol 12 (12) ◽  
pp. 1888 ◽  
Author(s):  
Junda Ren ◽  
Chao Xing ◽  
Yiqiu Tan ◽  
Nan Liu ◽  
Jingyi Liu ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Asphalt Mixture ◽  
Warm Mix Asphalt ◽  
Asphalt Mixtures ◽  
Micro Computed Tomography ◽  
Evaluation Indexes ◽  
Modified Asphalt ◽  
Mesoscale Structure ◽  
Void Distribution ◽  
Void Volumes

Warm mix asphalt mixtures have the advantages of energy saving, emission reduction and good road performance. Zeolite asphalt mixtures, as a warm mixing technology, have been applied in the world. To understand the warm mix mechanism of zeolite warm mix asphalt mixture, the mesoscale structure of zeolite asphalt is studied. Micro computed tomography (CT) is utilized to obtain the internal structure image of zeolite-modified asphalt and asphalt mixture. The quantity and volume of voids are used as internal void distribution evaluation indexes. The results indicate that with respect to the void distribution in zeolite-modified asphalt, with the increase of temperature, there is an obvious evolution trend of smaller voids to larger voids. With respect to the voids in the zeolite-modified asphalt mixture, the zeolite asphalt mixture is equivalent to hot mix asphalt mixture when it is above 120 °C, while below 120 °C, the maximum and average void volumes increase significantly, making it difficult for the mixture to achieve ideal compaction effect.

Rheological Properties of Asphalt Binder Modified with Chemical Warm Asphalt Additive

2013 ◽  
Vol 671-674 ◽  
pp. 1692-1699 ◽  
Author(s):  
Mohd Ezree Abdullah ◽  
Kemas Ahmad Zamhari ◽  
Mustafa Kamal Shamshudin ◽  
Hainin Mohd Rosli ◽  
Mohd Khairul Idham
Keyword(s):  
Energy Consumption ◽  
Rheological Properties ◽  
Permanent Deformation ◽  
Asphalt Binder ◽  
Asphalt Mixture ◽  
Mechanical Analysis ◽  
Warm Mix Asphalt ◽  
Dynamic Shear ◽  
Rotational Viscosity ◽  
Pavement Construction

Going towards sustainable pavement construction, asphalt industries constantly give their effort to implement Warm Mix Asphalt (WMA) by adding the chemical warm asphalt additive (CWAA). This can lower its energy consumption and pollution by reducing the mixing and compaction temperatures of the asphalt mixture without affecting its properties. Several studies have been conducted evaluating the properties of the WMA, however, little documented research on the rheology of the binders containing CWAA is available especially when dealing the sources of binders. In this paper, the tests for rheology characteristics of the Malaysian asphalt binder containing CWAA were conducted with rotational viscosity and for dynamic mechanical analysis with dynamic shear rheometer (DSR). The results of the investigation indicated that the CWAA had a significant reduction of required heat for mixing and compaction effort and also shows lower permanent deformation when compared to the control binder.

scholarly journals Warm Mix Asphalt Additive in Natural Rubber Modified Bitumen

2019 ◽  
Vol 266 ◽  
pp. 04005 ◽  
Author(s):  
Mazlina Mustafa Kamal ◽  
Kamarul Arifin Hadithon ◽  
Rohani Abu Bakar
Keyword(s):  
Natural Rubber ◽  
Energy Savings ◽  
Asphalt Mixture ◽  
Mechanical Analysis ◽  
Warm Mix Asphalt ◽  
Modified Bitumen ◽  
Rotational Viscometer ◽  
Compaction Temperature ◽  
Complex Shear ◽  
Reduction Of Emissions

The growing concern over the reduction of emissions and energy savings has led to the development of new paving technologies that are environmentally friendly. As a result, a warm mix asphalt technologies have been introduced to reduce the mixing and compaction temperature for asphalt mixture. The influence of additive with variation loading on the performance of Natural Rubber Modified Bitumen was acquired. In this work, Brookfield rotational viscometer test and Dynamic Shear Rheometer (DSR) mechanical analysis method and typical bitumen tests were employed. Results indicated that viscosity and the penetration of the Natural Rubber Modified Bitumen decreased, while the softening point increased with addition of additive. This in return would possible to reduce mixing and compaction temperature of the Natural Rubber Modified Mixture. Findings of the study also showed that the additive resulted in increase in complex shear modulus value and the rutting parameter modulus.

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