scholarly journals Selecting warm mix asphalt additives by the properties of warm mix asphalt mixtures - China experience

2015 ◽  
Vol 10 (1) ◽  
pp. 79-88 ◽  
Author(s):  
Xinsheng Li ◽  
Zhaoxing Xie ◽  
Wenzhong Fan ◽  
Lili Wang ◽  
Junan Shen
Keyword(s):  
Tensile Strength ◽  
Dynamic Stability ◽  
Asphalt Concrete ◽  
Warm Mix Asphalt ◽  
Asphalt Mixtures ◽  
Air Voids ◽  
Mastic Asphalt ◽  
Stone Mastic Asphalt ◽  
Crushed Aggregate ◽  
Marshall Stability

The objective of this research was to select the most effective warm asphalt additives for mix practice based on a series of laboratory testing programs such as density, Marshall stability, freeze-thaw splitting strength, dynamic stability, and bending beam strain. The experimental design of warm mix asphalt included the use of three commonlyused additives, two typical aggregate gradations, one crushed aggregate, and one modified asphalt. Results showed that: (1) the bulk specific gravity and air voids of all the mix specimens were similar to those of controls; (2) the Marshall stability and flow values of the warm stone mastic asphalt were 6.8%–26.6% and 3.5%–10.3%% higher than those of controls, respectively, and those of the warm asphalt concrete were 6.1%–15.6% and 6.5%–9.7% higher than those of controls, respectively; (3) the indirect tensile strength of two types of mixtures was 1.7%–14.4% lower than that of controls, and the average tensile strength ratio of the warm stone mastic asphalt and asphalt concrete was 4.3% and 1.3% higher than that of controls, respectively; (4) the dynamic stability of warm mix specimens was 10.8%–16.6% lower than that of the controls; (5) the average bending failure strain of warm stone mastic asphalt was 7.6% higher than that of the controls, and that of warm asphalt concrete was 12.8% lower than that of the controls; (6) Overall, warm asphalt mixtures with Sasobit and Rediset had relatively best performances required in Southeast China, where rutting and stripping are the main failures of asphalt pavements.

scholarly journals Assessment of Skid Resistance of Asphalt Mixtures in Laboratory Conditions

2012 ◽  
Vol 58 (4) ◽  
pp. 521-534 ◽  
Author(s):  
W. Gardziejczyk ◽  
M. Wasilewska
Keyword(s):  
Asphalt Concrete ◽  
Laboratory Tests ◽  
Asphalt Mixtures ◽  
Road Surface ◽  
Skid Resistance ◽  
Mastic Asphalt ◽  
Laboratory Conditions ◽  
University Of Technology ◽  
Road Surfaces ◽  
Stone Mastic Asphalt

AbstractThe aggregate applied for the wearing course has a significant influence on skid resistance of road surfaces. However, it is difficult to evaluate the behaviour of road surface in use on the basis of the Polished Stone Value (PSV) determined for the aggregate according to the so called ‘British method’. The British method, which is currently used in many countries, does not allow to determine the influence of neither the grain size of the aggregate nor the type of the wearing course on skid resistance of road surface. The present paper suggests a method for evaluation of the British Pendulum Number (BPN) for road surfaces in laboratory conditions. The authors assumed the BPN for polished slabs, made from asphalt mixtures, as the criterion. The index was measured with the British Pendulum Tester. The simulation of the process was conducted on research stand (called slab polisher) built at Bialystok University of Technology (BUT). The results of laboratory tests indicate that surfaces from asphalt concrete (AC) have slightly higher values of BPN in comparison with the values determined for surfaces made from stone mastic asphalt (SMA).

scholarly journals Evaluation of Warm Rubberized Stone Mastic Asphalt Mixtures through the Marshall and Gyratory Compactors

Materials ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 265
Author(s):  
Juan Gallego ◽  
Ana María Rodríguez-Alloza ◽  
Leticia Saiz-Rodríguez
Keyword(s):  
Greenhouse Gas Emissions ◽  
Greenhouse Gas ◽  
Mechanical Behaviour ◽  
Permanent Deformation ◽  
Warm Mix Asphalt ◽  
Asphalt Mixtures ◽  
Reflective Cracking ◽  
Mastic Asphalt ◽  
Water Sensitivity ◽  
Stone Mastic Asphalt

Stone mastic asphalt (SMA) mixtures exhibit excellent behaviour; they are highly resistant to reflective cracking and permanent deformation, as well as providing the wearing surface with an optimal texture. However, the production and compaction temperatures are similar to conventional mixtures, which means that there is a significant consumption of energy, as well as greenhouse gas emissions. Warm mix asphalt (WMA) technology, which has been developed over the last few years, might allow lower temperatures without compromising the mechanical behaviour of the mixtures. Also, over the last few decades, rubberized asphalt has proved to be effective in improving the performance and being environmentally suitable, but it requires higher production temperatures than conventional mixtures. In this study, several tests were performed to evaluate the effect of a chemical WMA additive on the compactability and water sensitivity of rubberized SMA mixtures with both the Marshall and the gyratory compactor. The investigation has shown that the gyratory compactor is more suitable for studying compactability and the water sensitivity of rubberized SMA with WMA additives.

Research of Road Application Performances of Asphalt Mixtures with Active Mineral Powder

2014 ◽  
Vol 599 ◽  
pp. 218-223
Author(s):  
Peng Cheng Yue ◽  
Pan Fei Liu ◽  
Jian Zhon Dong ◽  
Ping Ping Ding
Keyword(s):  
Dynamic Stability ◽  
Asphalt Concrete ◽  
Moisture Damage ◽  
Asphalt Mixtures ◽  
Test Machine ◽  
Splitting Test ◽  
Marshall Test ◽  
Mineral Powder ◽  
Failure Life ◽  
Marshall Stability

In this paper the effect of Active mineral powder (AMP) on the fundamental behavior of asphalt concrete especially in moisture damage was studied. Polycyclic Soaking Marshall test and freeze-thaw and splitting test were used to investigate the resistance of mixtures to moisture damage. Dynamic stability of mixture was evaluated by soaking rutting and the fatigue life of asphalts mixture with and without AMP was measured by universal test machine (UTM). After adding AMP, Retained Marshall Stability, Tensile Strength Ratio and dynamic stability value of asphalt concrete is higher than that of non-containing AMP asphalt concrete. The failure life of asphalt concrete increased as adding AMP. The results showed that the addition of AMP could improve the performance of failure life and resistance to moisture damage.

scholarly journals MAIN STANDARD INDICATORS OF POLYMER ASPHALT CONCRETES

2021 ◽  
Vol 445 (1) ◽  
pp. 194-202
Author(s):  
M. Zh. Zhurinov ◽  
B. B. Teltayev ◽  
E. D. Amirbayev
Keyword(s):  
Tensile Strength ◽  
Asphalt Concrete ◽  
Low Temperatures ◽  
Water Saturation ◽  
Petrochemical Plant ◽  
Type B ◽  
Freezing And Thawing ◽  
Mastic Asphalt ◽  
Reactive Polymers ◽  
Stone Mastic Asphalt

The main indicators of 29 types of asphalt and polymer asphalt concretes prepared with the use of neat bitumens of 2 grades and 7 types of polymer bitumens have been determined and comparatively analyzed in the work. The bitumens of grades BND 100/130 and BND 130/200 produced by the Pavlodar petrochemical plant have been selected for preparation of the asphalt concretes, polymer bitumens and polymer asphalt concretes. 7 types of the polymers (Elvaloy 4170, Elvaloy AM, Kraton D 1192A, Calprene 501, SBS L 30-01 A, KUMHO KTR, Butonal NS 198) have been selected for the modification of the bitumens. Short procedure has been represented for the preparation of the polymer bitumens. 29 types of the asphalt and the polymer asphalt concretes have been prepared with the use of the above bitumens and polymer bitumens (asphalt concrete of type A - 7, asphalt concrete of type B - 15, stone mastic asphalt concrete SMA-15 - 1, stone mastic asphalt concrete SMA-20 - 6). The following main indicators of quality have been determined for the asphalt concretes and polymer asphalt concretes by testing in relevant laboratory devices: 1) rut depth at the temperature of 60 °С after 10 000 passages of the wheel (ST RK EN 12697-22-2012); 2) tensile strength at the temperature of -30 °С (pr. EN 12697-46-2012); 3) compression strength at the temperature of 50 °С (ST RK 1218-2003); 4) water saturation (ST RK 1218-2003). It is found out that the modification of the bitumens with the polymers increases essentially the main standard indicators of the asphalt concretes: rutting resistance, strength at high temperatures and low temperatures, resistance to the cyclic freezing and thawing (frost resistance). The reactive polymers Elvaloy 4170 and Elvaloy AM are the most efficient among the used ones.

scholarly journals Assessment of Impact of Aramid Fibre Addition on the Mechanical Properties of Selected Asphalt Mixtures

Materials ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3302
Author(s):  
Damian Wiśniewski ◽  
Mieczysław Słowik ◽  
Jan Kempa ◽  
Agnieszka Lewandowska ◽  
Joanna Malinowska
Keyword(s):  
Asphalt Concrete ◽  
Asphalt Mixtures ◽  
The Other ◽  
Aramid Fibre ◽  
Asphalt Binders ◽  
High Modulus ◽  
Mastic Asphalt ◽  
Aramid Fibres ◽  
Stone Mastic Asphalt ◽  
The Impact

Various additives to asphalt binders and asphalt mixtures improving their properties are being used more and more frequently in order to improve the durability of road pavements. Such additives include various types of fibres, including aramid fibres. Tests concerning the impact of aramid fibre addition on the properties of selected asphalt mixtures have been described herein. Two types of asphalt mixtures were assessed: high modulus asphalt concrete (HMAC) and stone mastic asphalt (SMA). The examined asphalt mixtures were assessed with regard to: resistance to rutting, resistance to water and frost as well as fatigue resistance. The conducted tests showed relatively small impact of aramid fibre addition on the improvement of some assessed properties of the analysed asphalt mixtures. The obtained results were also compared to results of the tests conducted by the other research team concerning the impact of aramid fibre addition on the properties of the other types of asphalt mixtures.

Material and Cost Solutions Used for Construction of Upper Layers of the Road Pavement Structures

2018 ◽  
Vol 878 ◽  
pp. 224-228
Author(s):  
Ewa Ołdakowska
Keyword(s):  
Asphalt Concrete ◽  
Cost Optimization ◽  
Weather Conditions ◽  
Asphalt Mixtures ◽  
Thin Layers ◽  
Mastic Asphalt ◽  
Road Pavement ◽  
Rigid Pavements ◽  
Stone Mastic Asphalt ◽  
Rigid Design

Availability and variety of materials and technologies used for construction of roads allows for searching for solutions which are the best and optimal in the economical range. The article presents the analysis of various design solutions (susceptible, semi-rigid, and rigid pavements) depending on material and cost solutions. In case of susceptible and semi-rigid pavements the first layer subjected to direct influence of traffic and weather conditions is the grindable layer. It may be made from various mineral and asphalt mixtures: stone mastic asphalt (SMA), asphalt concrete (AC), porous asphalt (PA), asphalt concrete for very thin layers (BBTM), and mastic asphalt (MA). The costs of realization of 4 cm of the grindable layer vary from 40.37 PLN to 50.65 PLN (1 PLN = 0.26 USD) depending on used mixture. Another layer in the susceptible and semi-rigid pavements is the binding layer, and the realization cost per 1m2 of the binding layer e.g. of type B is from 53.46 PLN to 71.37 PLN depending on used mixture and traffic category. The materials used for realization of the binding layer are the mineral and asphalt mixtures, in particular the asphalt concrete of three recommended graining - AC 11, AC 16, and AC 22. The material and cost optimization of the typical solutions of the pavement design, taking all layers into consideration, allowed for determining the “economical” solutions not only for a given traffic category, but also for a given type. Savings in case of the same design types are from approximately 11 PLN to over 12 PLN for the susceptible and semi-rigid design, and from 0.39 PLN to 0.49 PLN in case of realization of 1 m2 of the rigid design.

Effects of Crushed Glass Waste as a Fine Aggregate on Properties of Hot Asphalt Mixture

2021 ◽  
Vol 28 (3) ◽  
pp. 129-145
Author(s):  
Ahmed Almuhmdi ◽  
 Abdulbasit Muhmood ◽  
Abdulhakim Salih
Keyword(s):  
Tensile Strength ◽  
Asphalt Mixture ◽  
Asphalt Mixtures ◽  
Partial Substitution ◽  
Fine Aggregate ◽  
Glass Waste ◽  
Air Voids ◽  
Binder Layer ◽  
Indirect Tensile ◽  
Marshall Stability

The recycling of waste requires large areas; besides recycling wastes to their origin is often economically and environmentally costly. Glass is considered as a solid waste that is difficult to dispose of; it doesn't degrade nor burn. Since glass is a silicic substance with similar properties to aggregates, it can be recycled in asphalt mixtures. This research aims to determine optimum binder content (OBC) of conventional hot asphalt mixture (HMA), (control mixture), and investigate the effect of crushed glass waste (CGW), on its properties. In this work, several percentages of CGW (10%, 15%, 20%, and 25%) have been used as a partial substitution for the weight of fraction size 2.36-0.075mm of natural aggregate to prepare glass-contained asphalt mixtures and compare their properties with the control mixture. Mix design by Marshall method was used, and the properties according to Iraqi standards (SORB/R9,2003), for binder layer, were found, as well as conducting of Retained Marshall stability (RMS), indirect tensile strength (IDT), and tensile strength ratio (TSR), tests on mixtures, as performance tests. The results showed that the OBC of the control mixture was 5% wt., and the Marshall stability and flow values of glass-contained asphalt mixtures were oscillating around the values of the control mixture. The air voids, voids in mineral aggregate, and bulk density were reduced regularly as CGW increased. Also, it was observed from the results that the glass-contained mixtures have good performance properties. However, all results conformed to the standards (SORB/R9, 2003). So, the incorporation of CGW in HMA for the binder layer is feasible.

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.

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