WO2022219553A1 - Régénérateur de recyclage de mélanges bitumineux vieillis - Google Patents

Régénérateur de recyclage de mélanges bitumineux vieillis Download PDF

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Publication number
WO2022219553A1
WO2022219553A1 PCT/IB2022/053466 IB2022053466W WO2022219553A1 WO 2022219553 A1 WO2022219553 A1 WO 2022219553A1 IB 2022053466 W IB2022053466 W IB 2022053466W WO 2022219553 A1 WO2022219553 A1 WO 2022219553A1
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Prior art keywords
oil
bio
rejuvenator
binder
asphalt
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PCT/IB2022/053466
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English (en)
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WO2022219553A8 (fr
Inventor
Satish Pandey
Sangita -
Prateek Tulsyan
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Council Of Scientific & Industrial Research
Verma Industries
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Publication of WO2022219553A1 publication Critical patent/WO2022219553A1/fr
Publication of WO2022219553A8 publication Critical patent/WO2022219553A8/fr

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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/08—Fats; Fatty oils; Ester type waxes; Higher fatty acids, i.e. having at least seven carbon atoms in an unbroken chain bound to a carboxyl group; Oxidised oils or fats
    • C04B24/085—Higher fatty acids
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
    • C04B26/02—Macromolecular compounds
    • C04B26/26—Bituminous materials, e.g. tar, pitch
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L91/00—Compositions of oils, fats or waxes; Compositions of derivatives thereof
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction

Definitions

  • the present disclosure relates to an asphalt rejuvenator, a paving composition, and a process for preparing a paving composition. Specifically, the disclosure relates to bio-oil based asphalt rejuvenator, a paving composition and a process for preparing a paving composition based on the asphalt rejuvenator.
  • Asphalt pavements or roads are prepared using a paving composition also known as asphalt that includes bitumen mixed along with coarse aggregates, such as stones, gravel, sand, and the like.
  • Bitumen is a dense, highly viscous, petroleum- based hydrocarbon that is found in deposits such as oil sands and pitch lakes (natural bitumen) or is obtained as a residue of the distillation of crude oil (petroleum residue).
  • asphalt is prepared using the bitumen obtained from distillation of crude oil.
  • Asphalt pavements deteriorate over time due to the impact of traffic, water and sunlight.
  • the deterioration in pavement quality can lead to permanent deformation or rutting, cracking or brittleness which leads to inferior riding quality and potholes.
  • This deterioration in asphat pavements is a result of aging of bitumen which is majorly caused by ultraviolet radiation.
  • the aging of bitumen results in a decrease in its penetration value and an increase in its softening point and viscosity.
  • Reclaimed asphalt pavements (RAP) material obtained through milling of bituminous layers of asphalt pavement is the main source of recycled material, but their use has been limited to low proportions.
  • RAP Reclaimed asphalt pavements
  • a drawback in using a high content of recycled materials in asphalt (pavement composition) is that the resulting pavements become susceptible to distresses such as longitudinal and lateral cracking, map cracking, fatigue cracking etc., because of the high stiffness of aged bitumen. This higher potential for the occurrence of these distresses could ultimately result in higher pavement maintenance and rehabilitation costs.
  • aged bitumen also limits the quantum of reclaimed material that can be utilized in recycled mix and limits the present utilization level of reclaimed asphalt pavement material to 20% to 30%.
  • the recycling of aged bitumen is usually carried out by adding rejuvenating agents to restore the properties of aged bitumen in the asphalt to satisfy the requirement for use.
  • rejuvenators currently used are based on petrochemicals and therefore result in increased cost of recycling as well as an environmental burden.
  • the disclosure provides a rejuvenator for recycling asphalt.
  • the rejuvenator includes a Bio-oil A, wherein the Bio-oil A is a non-hydrogenated plant oil comprising 10-16% Palmitic Acid, 40-50% Linoleic Acid, 8-16% Oleic Acid and 15-22% Stearic Acid of the total amount of fatty acid; and a Bio-oil B, wherein the bio-oil B is obtained from biomass pyrolysis and comprises 20% to 35% rosin acid.
  • the ratio of Bio Oil A to Bio-Oil B, in the rejuvenator is in the range of 1:100 to 100:1.
  • the disclosure also provides a paving composition.
  • the paving composition comprises 30 % to 80 % w/w reclaimed asphalt pavement (RAP) material, 70 % to 20 % w/w freshly crushed natural aggregate, 2% to 4 w/w % virgin bitumen and 2% to 6% w/w % rejuvenator by weight of residual bitumen content in the reclaimed asphalt pavement (RAP) material wherein the rejuvenator, comprises a Bio-oil A, wherein the Bio-oil A is a non-hydrogenated plant oil comprising 10-16% Palmitic Acid, 40-50% Linoleic Acid, 8-16% Oleic Acid and 15-22% Stearic Acid of the total amount of fatty acid; and a Bio-oil B, wherein the bio-oil B is obtained from biomass pyrolysis and comprises 20% to 35% rosin acid; and wherein the ratio of Bio Oil A to Bio-Oil B, is in the range of 1:100 to 100:1.
  • the disclosure also provides a process of preparing
  • Figure 1 illustrates the effect of 5% rejuvenator on penetration of aged binder in accordance with an embodiment of the disclosure.
  • Figure 2 illustrates the effect of rejuvenator content on penetration of aged binder in accordance with an embodiment of the disclosure.
  • Figure 3 illustrates the effect of 5% rejuvenator on softening point of aged binder in accordance with an embodiment of the disclosure.
  • Figure 4 illustrates the effect of rejuvenator content on softening point of aged binder in accordance with an embodiment of the disclosure.
  • Figure 5 illustrates the effect of rejuvenator content on viscosity of aged binder in accordance with an embodiment of the disclosure.
  • Figure 6 illustrates the effect of rejuvenator content on rutting behaviour of aged binder at 1.59 Hz frequency at different temperatures in accordance with an embodiment of the disclosure.
  • Figure 7 illustrates the effect of rejuvenator content on fatigue behaviour of aged binder at 1.59 Hz frequency at different temperatures in accordance with an embodiment of the disclosure.
  • Figure 8 shows the Multiple Stress Creep Recovery Test curve at 0.1 kPa of Virgin Binder, aged binder, and rejuvenated binder with 2%, 4%, 6%, and 8% by weight rejuvenator content in accordance with an embodiment of the disclosure.
  • Figure 9 shows the Multiple Stress Creep Recovery Test curve at 3.2 kPa of Virgin Binder, aged binder, and rejuvenated binder with 2%, 4%, 6%, and 8% by weight rejuvenator content in accordance with an embodiment of the disclosure.
  • Figure 10 shows the Creep compliance value at 0.1 KPa of Virgin Binder, aged binder, and rejuvenated binder with 2%, 4%, 6%, and 8% by weight of the rejuvenator in accordance with an embodiment of the disclosure.
  • Figure 11 shows the viscosity curves of virgin, aged and rejuvenated binder with 2%, 4%, 6%, and 8% by weight of the rejuvenator, at variable shear rate at 60°C in accordance with an embodiment of the disclosure.
  • aggregate refers to particulate material suitable for use in asphalt. It generally comprises sand, gravel and crushed stone. Any conventional type of aggregates suitable for use in asphalt can be used. Examples of suitable aggregates include granite, lime stone, basalt, quartzite, gravel, and mixtures thereof.
  • Bitumen refers to a hydrocarbon based substance and includes both the naturally occurring bitumen and bitumen that is obtained from crude refining process.
  • bitumen refers to the coarse aggregates, such as stones, gravel, sand, and the like mixed with bitumen.
  • Reclaimed Asphalt refers to removed and/or milled, reprocessed pavement materials obtained from asphalt/bituminous mix layers, containing oxidized bitumen and aggregates.
  • the present disclosure provides a rejuvenator for recycling asphalt.
  • the rejuvenator comprises of two bio-oils - Bio-Oil A and Bio-Oil B.
  • the Bio-Oil A comprises of non-hydrogenated plant oil that includes a mixture of fatty acids.
  • the Bio-oil A is a non-hyrogenated plant oil comprising of 10-16% Palmitic Acid, 40-50% Linoleic Acid, 8-16% Oleic Acid and 15-22% Stearic Acid.
  • the percentage of each of the fatty acids is as per the total amount of fatty acid that is present in the bio-oil A.
  • Bio-Oil A has physio- chemical properties such as low water content in a range from 5% to 15 %, high density at 20°C in a range from 1000 kg m 3 tol300 kg m 3 and a pH value in a range from 3 to 6.
  • Bio-oil A is low in a range from 5.5 to 8.5 x 10 6 m 2 /s.
  • the flashpoint of Bio-Oil A is in a range from 180°C to 210°C to ensure transportation and storage at high temperature.
  • the specific gravity of Bio-Oil A is in a range from 0.92 to 1.1.
  • the saponification value of Bio-Oil A is in a range from 190 to 200.
  • the acid value of Bio-Oil A is in a range from 5 to 17.
  • Bio-oil A is essentially obtained from the oil-bearing seeds/plants and includes but is not limited to rapeseed oil, jatropha curcas oil, pongamia oil or castor oil. In accordance with an aspect the Bio-oil A is jatropha curcas oil.
  • the Bio-Oil B is a by product of kraft process of the wood paper pulp industry and is obtained from biomass pyrolysis and comprises between 20% to 35% of rosin acid. In addition 20% to 35% of rosin acid Bio-oil B it also comprises one or more fatty acids.
  • the Bio- Oil B has a specific gravity in a range from 0.95 to 0.99 and acid value in a range from 180 to 210.
  • the saponification value of Bio-Oil B is in a range from 190 to 200.
  • the value of unsaponifiables which includes all the fractions of a fatty substance which are barely soluble in aqueous solutions but are soluble in organic solvent is within a range from 190 to 220.
  • Bio-Oil B is distilled tall oil.
  • Bio oil B is distilled tall oil obtained from soft wood including but not limited to wood from pine or spruce tree having an acid value in a range of 185 to 205.
  • the ratio of Bio Oil A and Bio-Oil B in the rejuvenator is in a range of 1:100 to 100:1 vol/vol.
  • the ratio of Bio-oil A to Bio-oil B in the rejuvenator is is the range of 80:20vol/vol to 60:40 vol/vol.
  • the ratio of Bio-oil A to Bio-oil B is in a range of 70:30 vol/vol
  • rejuvenator has a specific gravity in a range from 0.91 to 0.98, moisture content in a range from 5% to 10 %, initial boiling point (5% mass) in a range from 200 to 210°C.
  • the kinematic viscosity of the rejuvenator at 135 °C is in a range from 4 x 10 6 m 2 /s to 6 x 10 6 m 2 /s.
  • the flash point of the rejuvenator is in a range from 185 °C to 220°C.
  • the density (g/cc at 15°C) is in a range from 0.91 gm/cc to 0.94 gm/cc.
  • the rejuvenator may further include additives.
  • the additive compises of a mixtures of aromatic C9-C15 component of hydrocarbons originating from high temperature cracking of petroleum fraction and are separated by distillation and are rich in indene, methylidenes and naphthalene.
  • the rejuvenator of the present disclosure is capable of modifying the properties of the aged/oxidized bitumen in the reclaimed asphalt pavement composition, such that the recycled/rejuvenated bitumen binder has the properties that closely resemble those of virgin/original bituminous binder.
  • Bitumen mainly includes two major components, the asphaltene component and the maltenes component. With ageing caused by UV radiation, the asphaltene component of the bitumen increases and maltene content decreases which imparts hardness to asphalt. Without being limited to any particular theory, it is found that the rejuvenator does not convert asphaltenes to maltenes, rather, these contain maltenes and when added to reclaimed asphalt pavement (RAP) material it balances the asphaltene concentration in oxidezed binder by replenisheing the maltene levels.
  • RAP reclaimed asphalt pavement
  • the present disclosure also relates to a process for preparing the rejuvenator.
  • the process comprises the steps of blending Bio-Oil A and Bio-Oil B at a predefined stirring speed to ensure homogenization with and without additive. Mixing time is further optimized to ensure homogenization.
  • Paving composition comprises reclaimed asphalt pavement (RAP) material (consisting reclaimed aggregate and oxidized bituminous binder), virgin bitumen binder and the rejuvenator as described in detail above.
  • RAP reclaimed asphalt pavement
  • the paving composition comprises 30 % to 80 % w/w of reclaimed asphalt pavement material extracted from old bituminous/asphalt layers through milling or ripping and crushing, 70 % to 20 % w/w of freshly crushed natural aggregate conforming to the requirement laid down in Govt of India Ministry of Road Transport and Highways Specification for Road and Bridge Work for utilization in bituminous mixes, 2% to 4 w/w % fresh/virgin bitumen binder i.e.
  • viscosity graded bitumen or Performance grade bitumen binder or Polymer modified bitumen binder either conforming to Bureau of Indian Standard specification IS:73 Indian Standard Paving Bitumen Specification or ASTM standard D3381/D3381M “Standard specification for viscosity graded asphalt binder for use in pavement construction, or AASHTO M 320 Standard Specifcation for Performance Graded Asphalt Binder or IS 15462 “Specifcation for Polymer Modified Bitumen” and alike specification globally, 2 to 6 w/w % rejuvenator, by weight of residual asphalt/bittumen content in the reclaimed asphalt pavement (RAP) material.
  • RAP reclaimed asphalt pavement
  • the amount of rejuvenator required is optimized to replenish the physical properties of oxidized binder in the reclaimed asphalt pavement material and to have improved mechanical properties of resultant asphalt mix.
  • Said physical properties of the retrieved oxidized binder from reclaimed asphalt pavement material includes but not limited to penetration, softening point, viscosity, shear complex modulus (G*), and phase angle.
  • the amount of rejuvenator is also optimized using the mechanical properties of resulting paving composition/mix including but not limited to resilient modulus, indirect tensile strength and marshal stability.
  • the paving composition may further include additives.
  • additives are those that are known to a person skilled in the art and include but are not limited to crosslinkers, fillers (such as talc, hydrated lime and carbon black), ground tire rubber, shredded waste plastic, adhesion promoter and antistripping agents.
  • the amount of such additives can range from 0% to 4 % by weight based on the total weight of the paving composition.
  • Resultant paving composition is intended to be utilized, in binder course i.e., Dense Bituminous Macadam and Bituminous Macadm, and Wearing course i.e. Bituminous concrete/Asphalt concrete, and Semi Dense Bituminous Concrete and alike bituminous wearing courses.
  • the present disclosure also relates to a process of preparing a paving composition using the reclaimed asphalt material.
  • the process comprises hot mix recycling, the process wherein the reclaimed asphalt (RA) including the rejuvenator is mixed with new materials such as vergin bitumen and aggregates in a central hot mix plant or in hot in place /in-situ process to produce a recycled mix.
  • RA reclaimed asphalt
  • new materials such as vergin bitumen and aggregates in a central hot mix plant or in hot in place /in-situ process to produce a recycled mix.
  • the hot in-plant /central plant recycling process for preparing the paving composition comprises mixing together reclaimed asphalt pavement material having nominal aggregate size equal to or less than 37.5 mm, virgin/fresh aggregates, bitumen and rejuvenator, wherein the rejuvenator is added in reclaimed asphalt pavement material in such a way to ensure better diffusion in short span of time in drum or batch type hot mix plants.
  • Reclaimed asphalt pavement material is usually heated through (but not limited to) conductive heating while natural aggregates are super-heated to obtain resultant paving asphalt mix after mixing of all ingredients at a desired temperature.
  • the Reclaimed asphalt pavement material is heated to a temperature in the range of 130°C to 150°C.
  • the hot-in plant- recycling method comprises the steps of combining 30 to 80 w/w% Reclaimed Asphalt Pavement Material (RAP), 70 to 20 w/w% virgin aggregate, 2 to 4 w/w % fresh/virgin bitumen, and 2 to 6 w/w % rejuvenator by weight of residual asphalt content in the RAP.
  • RAP Reclaimed Asphalt Pavement Material
  • the in-plant process is used for the construction of a new binder course as well as wearing course layers.
  • the present disclosure also relates to a hot-in place- recycling process for preparing a paving composition.
  • the process comprises of removing at least a layer or a portion of the paving/road, to obtain pieces of pavement, heating the so obtained pieces of pavement and reducing the size of the heated pieces of pavement to obtain Reclaimed Asphalt Pavement Material.
  • the Reclaimed Asphalt Pavement Material so obtained, virgin aggregate, virgin binder, and the rejuvenator of the present disclosure are mixed to obtain the paving composition.
  • the hot-in-place-recycling process may be carried out within the vicinity of the pavement and may be used for resurfacing the top layer of a pavement. Said process may re-use up to 100% of the Reclaimed Asphalt Pavement Material.
  • the amount of virgin aggregate added in the process is in a range of 0 to 40 %.
  • the amount of rejuvenator is added in the range of 2 to 6%.
  • the amount of virgin binder is added in a range of 2 to 4%.
  • the natural aggregates are required to be heated to a temperature in the range of 150 to 190°C to obtain the paving composition with variable Reclaimed Asphalt Pavement Material concentration.
  • the paving composition may be at lower laying or paving temperature i.e 120 to 140°C and can be compacted at lower compaction temperature i.e 90 to 120°C to achieve minimum field density levels i.e 92 % of theoretical maximum specific gravity.
  • recycling of asphalt pavements has the advantages of decreasing the demand for natural resources, such as natural aggregate and virgin bitumen thus reducing the production of waste material while reducing cost. Desirably the amount of the Reclaimed Asphalt Pavement Material that is intended to be recycled is maximized and the amount of new material that is added to the recovered asphalt is minimized.
  • Example 1 Sample preparation and characterization tests for analysis of binder samples with the rejuvenator
  • a rejuvenated binder was prepared by mixing the composite oil composition (“inventive rejuvenator” or “composite oil composition comprising Bio-oil A and Bio-oil B in a 70: 30 w/w ratio”), to the aged binder.
  • Example 2 Results of characterization tests on binder samples with the reju Venator
  • the composite oil improves the properties of the aged binder as compared to the samples containing only Bio-oil A or Bio-oil B.
  • Differently aged binders simulating long term and short term aging was rejuvenated with 2%, 4% and 6% by weight of the composite oil composition.
  • a doses of 3%, 4% and 5.3 % by weight of aged binder of the composite oil composition is able to restore the softening point of differently aged binder for 12, 16 and 20 hr duration to the level of virgin bitumen binderVG30.
  • the rejuvenator is able to restore the softening point of aged bitumen binder.
  • Rutting reflects the irrecoverable deformation of asphalt during loading process. It is one of the major causes of distress in the asphalt pavements, especially at high summer temperatures and under heavy axle loads. On the other hand, in order to resist fatigue cracking a binder should be an elastic that it’s able to rebound. The rutting and fatigue behavior was tested according to the procedure described in Table 1 using the Temperature Sweep test conducted on Dynamic Shear Rheometer (DSR)
  • rutting resistance factor decreases with increase in temperature.
  • the PAV aged binder shows high rutting resistance due to increased stiffness.
  • the parameter G*/sin5 describe the irrecoverable deformation of asphalt during loading.
  • the temperature sweep test was run with a temperature range of 40°C to 76 °C, at a frequency of 1.59Hz. it is observed that rutting resistance factor decreases with increase in temperature.
  • Rejuvenated binder with 4 % composite rejuvenator shows better rut resistance in comparison to virgin binder VG 30, in terms of higher G*/sin5 value on all temperature ranges. It indicates that the invented rejuvenator while reducing the stiffness of aged binder maintains higher rut resistance characteristics in comparison to virgin binder at elevated temperature ranges.
  • a binder should be elastic enough to rebound after application of load, therefore, the viscous portion of shear modulus g*sin5 should be minimum.
  • G* sine d value of virgin, pav aged and rejuvenated binder is measured in a strain-controlled mode at 1.59 Hz frequency using temperature sweep test at a temperature range of 40 to 10 °C . It is found that invented rejuvenator is able to impart elasticity to stiff binder at lower temperature ranges.
  • the temperature at which G*sin5 ⁇ 5000Kpa defines the fatigue cracking behaviour of bitumen lower the failed temperature value indicates better fatigue resistance potential of bitumen.
  • Creep is a phenomenon that strain increases gradually over time when stress is a constant value. In this test, specimen is subjected to a constant load for fixed time period and then allowed to recover at zero load for a fixed time period.
  • a Multiple Stress Creep Recovery Test (MSCR) test can reflect the nonlinear rheological response of modified asphalt under a large stress. The test was performed as described in Table 1. As seen in Figs 8 and 9, the cumulative deformation of aged sample is minimum, as aging causes the non-deformability of asphalt. The addition of rejuvenator increases the cumulative deformation of aged asphalt. The higher the dosage of rejuvenator, the higher the deformability of rejuvenated asphalt. Thus, the deformation recovering capacity is improved by aging effect. 6% rejuvenated asphalt has a cumulative deformation curve with close to that of virgin asphalt, which demonstrates that the trend of cumulative deformation under different stress varies.
  • the creep recovery test was conducted at low and high stress level of 0.1 kPa & 3.2 KPa. Shown in Fig. 10, it is seen that aged binder shows the lowest compliance value compared to virgin and rejuvenated aged binders which means aging would reduce creep recovery ability of binder.
  • the creep recovery test shows that addition of inventive rejuvenator at 6% by weight of the aged binder replenishes the creep recovery characteristics of aged binder to virgin state and improving the elastic component of aged binder.
  • Example 3 Effect of inventive rejuvenator on reclaimed asphalt pavement mixtures
  • Trial mix blends with 30, 40 and 60 and 80 % RAP content were prepared by mixing the coarse and fine RAP with virgin aggregate and stone dust in such a manner that the resultant blend shall satisfy the stipulated gradation requirement for DBM grade II mix as prescribed in MoRTH specifications for Road and Bridge works, Vth revision.
  • the mix design was carried out using Marshall method of mix design for Hot Mix Recycling.
  • Optimum quantity of virgin bitumen to be added in the recycled mix is determined on the basis of the minimum binder content requirement as stipulated in MoRTH specification for DBM, grade II mix and various mix design parameters.
  • Rejuvenator was added in the virgin bitumen and mixed well at 1300°C temperatures through stirring to ensure uniform distribution.
  • Table 3 gives the properties of recycled bituminous mix with 30, 40 and 60 and 80 % RAP at optimum binder content without rejuvenator while Table 4 gives the properties of the recycled bituminous mix with 30, 40 and 60 and 80 % RAP with the rejuvenator.
  • the Indirect Tensile Strength Test is used to determine the tensile properties of the bituminous mixture which can further be related to the cracking of the pavement test was performed with confirming the standard guidelines of ASTM D 6391. The test results are summarized in Table 5 below.
  • RAP material obtained from GR-Infra project site at Varanasi ring road project.
  • RAP was extracted from the distressed bituminous layers of the same project site though cold milling process. Milled RAP were further subjected to screening and crushing at the project site for segregation as coarse and fine RAP and stockpiled separately at project site for utilization purpose.
  • Coarse RAP primary comprises the fraction 100% passing from 13.2 mm sieve while fine RAP consists of fraction 100 % passing from 9.5 mm sieve.
  • Coarse and fine RAP were subjected to sieve analysis to determine their gradation. Residual binder content in the RAP is determined through binder extraction test by carrying out quantitative separation of aggregate and bitumen. Virgin coarse natural aggregates, belonging from basaltic rock groups were obtained from the project site and used to meet out the gradation requirement. Table 8 gives the gradation of coarse and fine RAP along with residual binder content and moisture content:
  • bitumen Binder VG 40 bitumen binder is utilized to replenish the deficit binder content in the recycled mix bituminous mix. d.
  • Job mix for 40, 50 and 60 % RAP content is developed using Marshall method of mix design as stipulated in Asphalt Institute manual MS 20 for Hot Mix Recycling.
  • Job mix is prepared to carry out Hot-in-Plant Recycling using Marini batch type hot mix plant having hot/coarse and cold/fine RAP feeding capacity.
  • Total binder content in the recycled mix at 40 and 50 % rap content was kept 4.75 % by weight of mix while for 60 % RAP content job mix is prepared at 4.5 % total binder content by weight of mix.
  • Inventive Rejuvenator is added in the virgin bitumen and mixed well at 130° C temperatures through stirring to ensure uniform distribution.
  • Table 12 provides the job mix composition at variable RAP content along with the Marshall properties of recycled mix:
  • Table 12 Job Mix of Dense Graded Bituminous Mix-II with 40 , 50 and 60
  • Table 13 gives the penetration value of rejuvenated binder: Table :13 Properties of Rejuvenated binder h).
  • Indirect Tensile Strength Test Indirect tensile strength test is conducted under dry and wet conditions on marshall samples (2 no. each) casted through plant mix at the project site to determine the resistance against potential water damage.
  • Table 14 Indirect Tensile Strength under Dry and Wet conditions i ).
  • Resilient Modulus of Bituminous Cores with variable RAP Content M R tests on core samples as per ASTM D 4123-82 specification were performed in UTM machine. The resilient modulus (M R ) is defined as the elastic modulus based on recoverable strain under repeated load.
  • Table 15 provides the Resilient Modulus (Mr) Value of Samples.
  • Table 15 Resilient Modulus (Mr) Value of Samples
  • a rejuvenator for recycling asphalt comprising, a Bio-oil A, wherein the Bio oil A is a non-hydrogenated plant oil comprising 10-16% Palmitic Acid, 40-50% Linoleic Acid, 8-16% Oleic Acid and 15-22% Stearic Acid of the total amount of fatty acid, and, a Bio-oil B, wherein the bio-oil B is obtained from biomass pyrolysis and comprises 20% to 35% rosin acid, wherein the ratio of Bio Oil A to Bio-Oil B, is in the range of 1 : 100 to 100: 1.
  • Such rejuvenator(s) for recycling asphalt wherein the Bio-oil A is selected from a group of rapeseed oil, jatropha curcas oil, pongamia oil and castor oil.
  • Such rejuvenator(s) for recycling asphalt wherein the Bio-oil A is jatropha curcas oil.
  • Bio-oil B is a by-product of kraft process.
  • Such rejuvenator(s) for recycling asphalt wherein the Bio-oil B is distilled tail-oil.
  • Such rejuvenator(s) for recycling asphalt wherein the ratio of Bio-oil A to Bio-oil B is in a range of 80: 20 to 60:40 volume/volume of Bio-oil A: Bio-oil B.
  • Such rejuvenator(s) for recycling asphalt wherein the ratio of Bio-oil A to Bio-oil B is 70:30 vol/vol.
  • a paving composition comprising, 30 % to 80 % w/w reclaimed asphalt pavement (RAP) material, 70 % to 20 % w/w freshly crushed natural aggregates, 2% to 4 w/w % virgin bitumen and, 2% to 6% w/w % rejuvenator by weight of residual asphalt content in the reclaimed asphalt pavement (RAP), wherein the rejuvenator, comprises, a Bio-oil A, wherein the Bio-oil A is a non-hydrogenated plant oil comprising 10-16% Palmitic Acid, 40-50% Linoleic Acid, 8-16% Oleic Acid and 15-22% Stearic Acid of the total amount of fatty acid, and, a Bio-oil B, wherein the bio-oil B is obtained from biomass pyrolysis and comprises 20% to 35% rosin acid, wherein the ratio of Bio Oil A to Bio-Oil B, is in the range of 1:100 to 100:1.
  • RAP reclaimed asphalt pavement
  • a process of preparing a paving composition comprising mixing reclaimed asphalt pavement material having nominal aggregate size equal to or less than 37.5 mm; virgin aggregates, bitumen, rejuvenator and filler.
  • Such process(s) for preparing paving composition wherein the reclaimed asphalt pavement material is heated to a temperature in a range of 130 to 150° C and freshly crushed natural aggregates are heated to a temperature in the range of 150 to 190°C.
  • Recycling of asphalt pavements has the advantages of decreasing the demand for natural resources, in terms of natural aggregates and virgin bitumen required for resurfacing of bituminous pavement besides reducing the production of waste material generated during milling of bituminous layers while reducing the cost of construction. Desirably the amount of the Reclaimed Asphalt Pavement Material that is intended to be recycled is maximized and the amount of new material that is added to the recovered asphalt is minimized.
  • Reclaimed asphalt pavement can be recycled “in-place (i.e. at the road location) or can be recycled in-plant” (i.e. the RAP is removed from the road surface and transported to an asphalt mix plant).
  • the present disclosure provides an alternative rejuvenating agent, a resultant paving composition and has sought to provide an agent wherein at least a proportion of the agent is a natural product obtained through naturally renewable resources.
  • Incorporating a plant product instead of a petroleum product in asphalt recycling offers a potentially more sustainable product and may lead to price and supply advantages.
  • the natural-product based rejuvenating agent has the required technical properties and its use is safe and easy to handle.

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  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Structural Engineering (AREA)
  • Polymers & Plastics (AREA)
  • Medicinal Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Road Paving Structures (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

L'invention divulgue un régénérateur de recyclage d'asphalte. Le régénérateur comprend une bio-huile A, la bio-huile A étant une huile végétale non hydrogénée comprenant de 10 à 16 % d'acide palmitique, de 40 à 50 % d'acide linoléique, de 8 à 16 % d'acide oléique et de 15 à 22 % d'acide stéarique de la quantité totale d'acide gras ; et une bio-huile B, la bio-huile B étant obtenue à partir d'une pyrolyse de biomasse et comprenant de 20 % à 35 % d'acide de colophane ; le rapport de la bio-huile A à la bio-huile B s'inscrivant dans la plage de 1:100 à 100:1. L'invention divulgue également une composition de pavage et un procédé de préparation d'une composition de pavage qui comprend un matériau de revêtement d'asphalte régénéré.
PCT/IB2022/053466 2021-04-13 2022-04-13 Régénérateur de recyclage de mélanges bitumineux vieillis WO2022219553A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116103978A (zh) * 2023-02-16 2023-05-12 滨州市公路勘察设计院有限公司 基于废机油的老化沥青再生装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9828506B2 (en) * 2012-04-26 2017-11-28 Kraton Chemical, Llc Rejuvenation of reclaimed asphalt
US20200165459A1 (en) * 2016-08-30 2020-05-28 Iowa State University Research Foundation, Inc. Asphalt products and methods of producing them for rejuvenation and softening of asphalt

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9828506B2 (en) * 2012-04-26 2017-11-28 Kraton Chemical, Llc Rejuvenation of reclaimed asphalt
US20200165459A1 (en) * 2016-08-30 2020-05-28 Iowa State University Research Foundation, Inc. Asphalt products and methods of producing them for rejuvenation and softening of asphalt

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116103978A (zh) * 2023-02-16 2023-05-12 滨州市公路勘察设计院有限公司 基于废机油的老化沥青再生装置
CN116103978B (zh) * 2023-02-16 2024-05-03 滨州市公路勘察设计院有限公司 基于废机油的老化沥青再生装置

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