Physical properties and storage stability of asphalt binder modified with nanoclay and warm asphalt additives (original) (raw)
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Performance of asphalt binder blended with non-modified and polymer-modified nanoclay
Construction and Building Materials, 2012
This study investigated the rheological properties of asphalt binders modified with nanomaterial additives. The additives used are non-modified nanoclay (NMN) and polymer modified nanoclay (PMN). They were added to the control PG 58-34 asphalt binder at concentrations of 2% and 4% by the weight of the asphalt binder, respectively. Superpave™ binder tests were employed to evaluate the characteristics of the nano-modified binders. Rheological properties of nano-modified asphalt were analyzed by use of asphalt binder tests such as Rotational Viscosity (RV), Dynamic Shear Rheometer (DSR) and Bending Beam Rheometer (BBR). In addition, the short-and long-term aging properties of nano-modified asphalt were analyzed, with the aging process simulated by Rolling Thin Film Oven (RTFO) and the Pressure Aging Vessel (PAV). The dissipated work per load cycle of all asphalt binders was examined, in order to better understand the properties of nano-modified asphalt. The results reveal that both viscosity and complex shear modulus of asphalt binder remarkably increase when the NMN is added into the control asphalt, and decrease slightly when the PMN is added. In addition, from the dissipated work perspective, the overall performance of PMN modified asphalt binder is improved in terms of rutting and fatigue cracking resistance relative to the NMN modified asphalt binder.
Evaluation of Selected Performance Properties of Nanoclay-Modified Asphalt Binders
MATEC Web of Conferences, 2019
Asphalt binders are often modified with additives such as acid, polymer, or a combination of multiple additives to achieve improved performance to sustain heavy loads and adverse weather conditions. According to some previous researches, nanoclay can be a good alternative of currently practiced Styrene-Butadiene-Styrene (SBS) modification, and the former is expected to reduce the overall cost of the asphalt binder. Three types of nanoclay (Cloisite 10A, 11B, and 15A) were blended with asphalt binders prepared from two different sources (Arabian Crude and Canadian Crude). A blending protocol has been developed to blend nanoclay with the base binders. Mechanical properties including viscosity, rutting parameter have undergone significant changes after the nanoclay modification. It was also observed that nanoclay modified binders offer different moisture susceptibility while bonding with different aggregates; the nanoclay modified asphalt binder exhibits better bonding with gravel than...
To Study the Mixing and Compaction Temperatures of Organophilic Nanoclay Modified Asphalt Binder
International Journal for Research in Applied Science and Engineering Technology (IJRASET), 2022
The use of modified asphalt binders in hot-mix asphalt has steadily increased over the past several decades. Mixing and compaction temperatures of an asphalt binder plays a vital role in the production and placement of asphalt mixes but there are no standards for mixing and compaction temperatures for modified asphalt binder especially with Organophilic nanoclay. In this study the effect of nanoclay modified binder on mixing and compaction temperatures of asphalt mixture was observed using conventional test for asphalt mixture-softening point test, penetration test and rotational viscometer test. Five different percentages i-e 3, 3.5, 4, 4.5 and 5% of Nanoclay (modifier) are selected for three different binders (ARL 60/70, ARL 80/100 & NRL 60/70). Six different samples for each binder are prepared and conventional testing is carried out using standard procedures. With an increase in the percentage of Nanoclay the softening point values and viscosity values increases, similarly the penetration values decrease. The mixing temperature range is 155-165°C and compaction temperature range is 135-145 °C to achieve maximum density in the field.
Assessment of Asphalt Binders and Hot Mix Asphalt Modified with Nanomaterials
Periodica Polytechnica Civil Engineering
In the recent times, asphalt binder modification has emerged an inevitable alternative in the paving industry to ensure better performing pavements against the distresses caused by common factors such as; moisture susceptibility and high-temperature sensitivity of asphalt binders. Nanomaterials, as asphalt-modifiers, have proved to be the most promising materials in the industry owing to their higher active surface area and small particle size. This study was devoted to assessing the modification influence of three different types of nanomaterials, including nano-Bentonite, nano-CaCO3, and ZycoTherm, on the properties of asphalt binder and HMA. Conventional and rheological tests on asphalt binders, as well as, Marshall mix design and modified Lottman test on laboratory-prepared HMA specimens were conducted in order to signify the influence of nanomodification. The research findings suggested that nanomaterials can potentially enhance the high-temperature susceptibility resistance, s...
Moisture susceptibility of hot mix asphalt containing asphalt binder modified with nanocomposite
Road Materials and Pavement Design, 2016
There are several methods to improve moisture susceptibility of asphalt mixtures that using additives or modifiers is the most common method in this regard. In this research, a new nanocomposite material was used for improving the moisture susceptibility of the asphalt mixtures. The experimental design included one base asphalt binder, two types of aggregates (granite and limestone) and 2% of nanocomposite (polypropylene/nanoclay). Indirect tensile strength and surface free energy tests were conducted to evaluate the moisture susceptibility of the asphalt mixtures. The surface free energy components of the aggregates and asphalt binders were obtained using universal sorption device and Wilhelmy plate methods, respectively. The test results showed that the tensile-strength-ratio values of the asphalt mixtures containing nanocomposite had improved. In addition, the results of surface free energy test indicated that the nanocomposite could be used to improve the moisture susceptibility of the asphalt mixtures.
Evaluation of Asphalt Binders Modified with Nanoclay and Nanosilica
During last decade, researchers' interest in nanotechnology applications, particularly in the field of pavement materials, has been increasing. This research work focused on the investigation of the properties of asphalt binder modified with different percentages of two different nanomaterials. These materials are nanoclay, and nanosilica. The nanosilica was manufactured from two different sources: silica fume and rice husk. Nanomaterials and asphalt binder were first characterized. A mechanical mixer was then used at 1500 rpm to mix the nanomaterials with the binder. Required mixing time was determined. Three different nanomaterial percentages were mixed with the binder. The modified binders were tested for rheological properties. Results showed that, nanosilica synthesized from silica fume tends to decrease the penetration value and increase the softening point temperature. The nanoclay on the other hand was found to increase the penetration and decrease the softening point temperature. At temperature of 135°C and up to 150°C, increasing nanosilica percentage was found to increase Brookfield Rotational Viscosity (RV), while nanoclay, at small percentages, increased the RV and then decreased it at higher percentages. At higher temperature, up to 165°C, the RV values did not change significantly using both nanomodifiers. Nanosilica from rice husk showed improvement in the RV results. Finally, the Dynamic Shear Rheometer (DSR) results showed obvious improvement in the performance grade leading to higher resistance to permanent deformation.
Construction and Building Materials, 2015
Virgin binder was modified with a linear-SBS polymer and OMMT. Nanoclay enhances physical and rheological properties of a SBS-modified binder as well as its storage stability. Nanocomposite modified asphalt improves performances of asphalt mixture at medium to high temperatures. Polymer and nanocomposite modified-asphalt mixtures are more resistant to moisture damage than conventional asphalt mixture. Nanocomposite asphalt mixture has less rut depth and is less susceptible to temperature changes than unmodified mixture.
Developments of nano materials and technologies on asphalt materials – A review
Construction and Building Materials, 2017
h i g h l i g h t s Many factors had effects on the properties of nano-modified asphalt binder. Nano materials improved low and high temperature performances of asphalt binder. Studies on nano modified mixtures were less than those on nano modified binders. Economic, ecological and environmental evaluations of need to be considered.
This study explores the effect of the addition of various concentration of organic nanoclay on the physical and rheological properties of asphalt binder. Two types (N3 and N4) of Organic Montmorillonite Nanoclay (OMMT) were used and blended with 80/100 penetration grade asphalt in various concentrations (0%, 3%, 5%, and 9%) by weight of bitumen. The physical properties of unaged base and nanoclay modified asphalt were characterized using viscosity, softening point, and penetration tests. The rheological properties of unmodified and nanoclay modified asphalt were determined using Dynamic Shear Rheometer (DSR) in accordance with AASHTO T315 in order to evaluate the effectiveness of OMMT type and concentration on the physical and rheological properties of asphalt binder. The results indicated remarkable increment in softening point; viscosity and decrement in asphalt binder's penetration for both types and contents of organic nanoclay as compared with unmodified bitumen. By increasing the amount of nanoclay content, the DSR results showed tremendous improvement on the rheological properties of nanoclay modified asphalt such as Complex Shear Modulus G* and Phase Angle δ at medium and high temperatures. As a consequence, the results showed that the organic nanoclay modified asphalts had higher rutting resistance and lower dissipated energy per load cycle this may contributed to the dispersion of the silicate platelet in bitumen that reinforce the binder. In comparison, N3 showed better effect in improving physical and rheological properties of asphalt binders and rutting resistance than N4, which may contributed to the homogenously dispersion of nanoclay particles that led to form an exfoliated structure in OMMT modified asphalt. The two-way ANOVA statistical analysis was carried out which indicated that OMMT concentration was more significant than OMMT type on rutting parameter, viscosity at high and intermediate temperature, and softening point while nanoclay type was more significant on penetration.