WO2018127837A1

WO2018127837A1 - Asphalt mixture additive

Info

Publication number: WO2018127837A1
Application number: PCT/IB2018/050076
Authority: WO
Inventors: Vikram Chinubhai SHAH
Original assignee: Shah Vikram Chinubhai
Priority date: 2017-01-06
Filing date: 2018-01-05
Publication date: 2018-07-12

Abstract

The present invention is to provide additive with specific characteristics to reduce amount of bitumen for any asphalt mixture or civil construction mixture or road paving mixture.

Description

TITLE: ASPHALT MIXTURE ADDITIVE

FIELD OF THE INVENTION

The present invention is to provide additive with specific characteristics to reduce amount of bitumen for any asphalt mixture or civil construction mixture or road paving mixture. Asphalt mixture means bitumen hot or cold mix and cement concrete mixture. Asphalt mixture can be used in any paving procedure like road paving, roof or ceiling paving etc. Further the present invention provides a product with commercially beneficial characteristics and cost effective and easy to use.

BACKGROUND OF THE INVENTION

Commonly in making a road is mixing hot bitumen as a binder with aggregate to create asphalt, transport this asphalt at the paving site and lay that while the asphalt is still hot. The same is used for other surface paving. In other civil construction like ceiling, beams, pillars, floor, road generally cement, concrete and sand mixture is used.

In that polymer modified asphalts containing an adhesive agent which can be applied at a much lower temperature. Also use of some pigments like titanium dioxide is known to mix into bitumen to change the colour of the asphalt, development of bitumen made from organic matter and creation of clear bitumen.

EP2602290 discloses asphalt composition and process for preparation of composition comprising a bitumen, aggregate material and a boiled vegetable oil.

US 8795426 discloses an asphalt composition, comprising: aggregate, binder coating the aggregate, the binder being at least partially transparent to visible and infrared radiation; titanium dioxide in the binder; and reflective particles embedded within and coated by the binder, the reflective particles being aluminum or aluminum oxide particles having fracture faces. US5389137 discloses a process for dyeing at least one of asphalt and bitumen with inorganic granulated pigments, wherein inorganic pigments, to which have been added at least one binding agent in a quantity of 0.1 to 10% by weight, relative to the inorganic pigments.

WO2009013339 discloses a polymer-modified bitumen composition. The composition comprises bitumen, polymer and a compatibilising agent prepared by reacting one or more unsaturated monomers with a bituminous composition comprising asphaltenes and/or resins.

US8851332 discloses a polymer-modified bitumen (PMB) compound for a bituminous covering layer of a roof sheet, predominantly including a distillation bitumen, in particular one which may contain a synthetic rubber filler in the form of SBS (styrene- butadiene-styrene) in an amount which modifies the properties of the distillation bitumen, wherein an additive which further modifies the bitumen is present in the form of a polymer. in all above patents bitumen is used. Bitumine as such is a viscous liquid or a solid consisting essentially of hydrocarbons and their derivatives. Hence bitumen is combined with other aggregate to provide proper asphalt. Other aggregates are needed to do some proper process like coating or not advisable aggregates like oil or cost matter.

The present invention relates to an additive for preparation of asphalt mixture wherein the final compositions comprises bitumen and bentonite and/or lime stone optionally with sulphur.

First embodiment of the present invention is to provide additive with specific characteristics to reduce amount of bitumen for any asphalt mixture. Asphalt mixture can be used in any paving procedure like road paving, roof or ceiling paving etc. or in civil construction mixture used for ceiling, beams, pillars, floor, road etc. Further the present invention provides a product with commercially beneficial characteristics and cost effective and easy to use. Another embodiment of the present invention is to provide additives used in any civil construction like ceiling, beams, pillars, floor, road.

Another embodiment of the present invention is to provide preparation of additive and conventional way of its use.

Still another embodiment of the present invention is to provide a product with commercially beneficial characteristics.

Still another embodiment of the present invention is to provide cost effective and easy to use.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a flow diagram for additive preparation

FIG. 2 is a flow diagram of one method of preparing asphalt DETAILED DESCRIPTION OF THE INVENTION

Currently bitumen, used in paving procedure, is thermoplastic material and its stuffiness is dependent on temperature. The temperature - vs - stiffness relationship of bitumen is dependent on the source of crude oil and method of refining. Few qualification tests were standard like specific gravity, water content, ductility , loss on heating & Farass breaking point are now removed from the specifications as these tests do not have any relationship either with quality or performance of the product of Bitumen in relation to viscosity grade specifications Therefore, the Penetration grades have been replaced by viscosity grade bitumen. According to viscosity (degree of fluidity) grading, higher the grade, stiffer the bitumen. Tests are to conduct at 60°C and 135°C, which represent the temperature of road surface during summer and mixing temperature respectively. The penetration at 250 C, which is annual average pavement temperature, is also retained. Different grades of bitumen are widely used in spraying application such as surface-dressing and paving in very cold climate in lieu of old 80/100 Penetration grade. It is also used to manufacture bitumen emulsion and modified bitumen products. VG-20 BITUMEN is used for paving in cold climate & high altitude regions VG-30 BITUMEN is primarily used to construct extra heavy duty bitumen pavements that need to endure substantial traffic loads. It can be used in lieu of 60/70 penetration grade. VG-40 BITUMEN is used in highly stressed areas such as intersections, near toll booths and truck parking lots in lieu of old 30/40 penetration grade. Due to its higher viscosity, stiffer bitumen mixes can be produced to improve resistance to shoving and other problems associated with higher temperature and heavy traffic loads.

The present invention provides an additive for preparation of asphalt mixture wherein the final compositions comprises bitumen and bentonite and/or limestone (CaC0₃) optionally with sulphur. The additives can be also used as bitumen modifier.

Bentonite is a highly colloidal clay mineral, first discovered from Fort Benton, America. Bentonite bears multiple properties like hydration, swelling, water absorption, viscosity, thixotropy make it a multi-application product for diverse industries. Primarily two varieties of bentonite available are sodium bentonite (high swelling, gelling and thermal durability) and calcium bentonite.

Bentonite has high swelling properties along with good viscosity and liquid limit. These properties are highly valued in most of the industrial applications. Bentonite exhibits good green strength along with high hot and dry strength which helps in preventing moulds from breaking or cracking during the pouring or cooling process in the industry. Owing to high green strength resulting from its property to absorb and then release moisture. Sodium-based Bentonite of 75 mm size finds suitability in iron ore pelletisation for bonding by user industries. Bentonite has also remarkable colloidal and waterproofing properties. Bentonite is also used in industries and in civil construction works. Bentonite is in the form of fine powder free from dirt and other foreign matter and of least swelling property. In the present invention an additive prepared for addition in asphalt mixture from rock of bentonite. The rock is crushed and prepared a powder of granule having mash size 80 - 350. The bentonite composition used here can be any form of bentonite. Preferably the additive composition may comprise any type of bentonite like calcium and sodium etc. individual or in combination and optionally limestone in the form of lumps/granule having mash size 80 - 300. and optionally sulphur in the form of granule having mash size 80 - 350. The additive can be used in asphalt preparation or any civil construction mixture up to 60%.

Addition of prepared additives gives positive change in the characteristics of final asphalt mixture. When compared to convention bitumen the additive of the present invention having solubility in trichloroethelene is 98% increases viscosity at 60°C - 135°C up to 250%, flash point at 135°C up to 150%, softening up to 35%, decreases penetration to 100% at 25°C.

So the additive prepared from bentonite gives many benefits for any type of paving including road paving, it will provide reduction in cost of material used in road paving as bitumen is costly, adding the additive of the present invention it will reduce the requirement of bitumen up to 50%. It is strong binder for any asphalt mixture. It is apt for high stress junction like intersection, near toll booths etc. it bears water resistance and gives no cracks on surface.

In the broad aspect of the present invention, the synthetic additive bentonite may be added to bitumen with or without limestone and sulphur.

If only bentonite is mixed with bitumen, then bitumen is 40 to 70%' and bentonite is 25 to not more than 60%, preferably 30 to 60%-. If bentonite with sulphur is mixed with bitumen, the percentages by weight sulphur is between 1 to 10%. if bentonite with limestone is mixed with bitumen, the percentages by weight limestone is between 1 to 30%. Preferably, the source for the bitumen for asphalt or roofing is coverings crude oil- refinery product and source for bentonite is mining mineral products.

Addition of the additives prepared herein can be added at any stage of preparation of paving mixture before final product to spread or spray. As shown in figure 2 additive can be added in liquid bitumen storage tank or in liquid bitumen tanker truck or in liquid bitumen storage tank hot mix plant or in hot mix bitumen and aggregates. Liquid Bitumen tank at hot mix plant is the most preferable stage for addition.

Examples

The present invention (named Sulpave) has been described by way of example only, and it is to be recognized that modifications thereto falling within the scope and spirit of the appended claims, and which would be obvious to a person skilled in the art based upon the disclosure herein, are also considered to be included within the scope of this invention.

BITUMEN SPECIFICATION BY GRADE

Table 1

Test results using powder of present invention of three samples of different batches. Sample 1 comprise 50% VG 30 bitumen + 50% of present invention

Sample 2 comprise 75% VG 30 bitumen + 25% of present invention

Table 2

With common test particulars of present invention results for three different molds are as under:

Table 3

Further examples of use of Sulpave of which official tests are done with achievement of the results mentioned in Table 4 to 16.

Percentage of sulpave in mixture comprises bitumen other aggregates for different type of roads or other civil constructions: Example 1: FOR THE HEAVY TRAFIC ON HIGHWAYS

Example 2: FOR THE LOW TRAFIC (CITI ROAD)

BENTONITE SULPHUR LIME STONE TOTAL SULPAVE

18 - 30% 0 -2% UPTO 8% 35%

Example 3: FOR THE RURAL/SERVICE/DIVERSION ROAD

BENTONITE SULPHUR LIME STONE TOTAL SULPAVE

30-40% 0-2% UPTO 13% 50%

ROADS FOR HOT TEMRETURE AREA

Example 4: FOR THE HEAVY TRAFIC ON HIGHWAYS

ROADS FOR COLD TEMPRETURE AREA

Example 5: FOR THE HEAVY TRAFIC ON HIGHWAYS

FOR CONCRETE MIX (RCC) ROADS

Example 6: FOR THE HEAVY TRAFIC ON HIGHWAYS OR CITI ROAD

FOR BUILDING COUNSTRUCTION CONCRETEMIX (RCC) Example 7: FOR THE RCC PILLERS/BIMS

Addition of Sulpave helps in reducing the amount of bitumen and increasing quantity of final composition of use. The present invention tested comprising bitumen with the 25% powder of present invention. Out of this 40% with 20mm, 20% with 10mm and 20% with dust the test grade selected are commonly used for different grated of bitumen as below.

The additive or modifier of the present invention contains organic matter, exhibits no sedimentation of its inorganic matter, can be manufactured anywhere, and does not require the use of specialized equipment for its manufacture, nor special requirement for storage. But the proper granule size matters with management of ratio of use based on the area, temperature, viscosity, penetration grade or other articles.

It will be surely seen, therefore, that the asphalt mixture comprising bitumen and bentonite additive of the present invention has many advantages, some of which are as shown below with test results:

® Increase in flash point

® More viscosity (Kinematic @ 135^CC)

® Double viscosity (Absolute @60°C)

* Increase softening point

Along with technical some commercial advantages are also worked and proved as follows: o Additives when mixed with bitumen, in the ratio of stated ranged, gives rise to an asphalt mixture fits into required specifications o It can be manufactured in any corner of the world with raw materials that are available internationally. o No requirement of any specialized equipment for preparation.

o Is prepared in powder form hence easy for storage and/or transportation. o Simple process for preparation

o Cost effective

o Road building material can be colored.

o Can be added at any stage of preparation of paving mixture before final product to spread or spray

o Using of Sulpave Bitumen VG-30 upgrade to VG-40

Above mentioned are major advantages of the additive/modifier of the present invention when compared with other known aggregated presently in use to mix with bitumen. Upon adding modifier of the present invention (Sulpave) to VG 30 Properties of VG-30 improved as VG-40 below:

BITUMEN TEST REPORT

Table 4

For clear comparison characteristics of the bitumen are tested with and without modifier of the present invention. The comparison shows the positive report upon using Sulpave. PENETRATION TEST OF BITUMEN without SULPAVE (As Per IS: 1203)

Grade of Bitumen: VG-30

Temp, of water-bath⁰ C 25

Temp, of Bitumen⁰ C 140 - 150

Cooling time at room temp. 60 - 90 min

Cooling time at water-bath 60 -90 min

Table 5

PENETRATION TEST OF BITUMEN with SULPAVE (As Per IS: 1203)

Grade of Bitumen: VG-30+ Sulpave (50%)

Temp, of water-bath⁰ C : 25

Temp, of Bitumen⁰ C : 140 - 150

Cooling time at room temp. : 60 - 90 min

Cooling time at water-bath : 60 -90 min

Table 6

SOFTENING POINT OF BITUMEN without SULPAVE (As Per IS: 1203)

Grade of Bitumen: VG-30

Temp, of water-bath⁰ C

Temp, of Bitumen⁰ C 140 - 150

Cooling time at room temp. 30 min

Cooling time at water-bath 15min

Rate of Heating 5° C +/- 0.5° C

Table 7

Table 8

SOFTENING POINT OF BITUMEN with SULPAVE (As Per IS: 1203) Grade of Bitumen: VG-30+ Sulpave (50%)

Temp, of water-bath⁰ C : 5°

Temp, of Bitumen C : 140 - 150 Cooling time at room temp. : 30 min

Cooling time at water-bath : 15min

Rate of Heating : 5° C +/- 0.5° C

Table 9

Table 10

DUCTILITY TEST OF BITUMEN without SULPAVE (After TFOT)

(As per IS: 1308)

Grade of Bitumen: VG-30

Temp, of water-bath⁰ C 27+/- 0.5 OC

Temp, of Bitumen⁰ C 140 - 150

Cooling time at room temp. 30 - 40 min

Cooling time at water-bath After cut of the excess bitumen : 85 - 95 min

Rate of Pull : 50 +/- 2.5 mm per min.

Table 11

DUCTILITY TEST OF BITUMEN with SULPAVE (After TFOT)

(As per IS: 1308)

Grade of Bitumen: VG-30+ Sulpave (50%)

Temp, of water-bath⁰ C : 27+/- 0.5 OC

Temp, of Bitumen⁰ C : 140 - 150

Cooling time at room temp. : 30 - 40 min

Cooling time at water-bath

After cut of the excess bitumen : 85 - 95 min

Rate of Pull : 50 +/- 2.5 mm per min.

Table 12

ABSOLUTE VISCOSITYOF BITUMEN without GSL SULPAVE

(As per IS: 1308)

Grade of Bitumen: VG-30

Temp, of water-bath⁰ C 60 +/- 0.5 °C

Temp, of Bitumen⁰ C 135 +/- 5.5°C Time in Oven 10 +/- 2 min

Vacuum Pressure 30 +/- 0.05 cm

Vacuum Apply for 30 +/- 5 min

Table 13

Note : Constant ( Poise / second )

B - 10.9649 at 60° C, C - 5.2521 at 60° C

ABSOLUTE VISCOSITYOF BITUMEN with GSL SULPAVE

(As per IS: 1308)

Grade of Bitumen: VG-30+ Sulpave (50%)

Temp, of water-bath C : 60 +/- 0.5 ^uC

Temp, of Bitumen⁰ C : 135 +/- 5.5°C

Time in Oven : 10 +/- 2 min

Vacuum Pressure : 30 +/- 0.05 cm Hg

Vacuum Apply for : 30 +/- 5 min

Table 14

Note : Constant ( Poise / second )

B - 10.9649 at 60° C, C - 5.2521at 60° C COATING AND STRIPPING VALUE OF BITUMEN AGG.MIXTURE without GSL SULP AVE (As Per IS: 6241)

Grade of Bitumen: VG-30

Temp of Bitumen⁰ C : 150

Temp of Aggregate⁰ C : 160

Temp of water ⁰ C : 40 +/- 1

Time duration under water : 24 Hrs.

Percentage of Binder : 5%

Total weight of Binder : 10 gm

Table 15

COATING AND STRIPPING VALUE OF BITUMEN AGG.MIXTURE with SULP AVE (As Per IS: 6241)

Grade of Bitumen: VG-30+ Sulpave (50%)

Temp of Bitumen⁰ C : 150

Temp of Aggregate⁰ C : 160

Temp of water ⁰ C : 40 +/- 1

Time duration under water : 24 Hrs.

Percentage of Binder : 5%

Total weight of Binder : 10 gm Table 16

The test results conclude that addition of Sulpave strengthen the characteristics of bitumen and thereby the ultimate product and its use.

While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiments, it is to be considered that the invention is not to be limited to the disclosed embodiments, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. immaterial modifications may be made to the embodiments described here without departing from what is covered by the examples or claims. In the description or claims, the word "comprising" is used in its inclusive sense and does not exclude other elements being present. In addition, reference to an element by the indefinite article "a" or "an" does not exclude the possibility that more than one of the element is present, unless the context clearly requires that there is only one of the elements. The indefinite article "a" or "an" thus usually means "at least one". Each one of the individual features described here may be used in one or more embodiments and is not, by virtue only of being described here, to be construed as essential to all embodiments as defined by the claims.

Claims

I claim,

1. Asphalt mixture additive comprising bentonite in the form of powder of lumps / rocks having mash size 80 -- 350 optionally with sulphur granules.

2. Asphalt mixture additive as claimed in claim 1, wherein bitumen s 40 to 70%, and bentonite is 30 to 60%.

3. Asphalt mixture additive as claimed in claim 1, wherein sulphur granules 1 to 10%.

4. Asphalt mixture additive as claimed in claim 1, comprises a additive with solubility in trichloroethelene 98%, increases in viscosity up to 250%, increases in flash point up to 150%. increases in softening up to 35%. decrease in penetration up to 100%.

5. Asphalt mixture additive as claimed in claim 1, wherein composition comprises limestone 0 - 15% having mash size 80 - 300.

6. Asphalt mixture additive as claimed in claim 1, wherein final composition for bitumen mix road comprises bentonite 10 - 40%, limestone 1- 15% and sulphur 1 - 5%, bitumen and other aggregates.

7. Asphalt mixture additive as claimed in claim 1, wherein final composition for bitumen mix road for cold temperature area comprises bentonite 15 - 22%, limestone 0- 5% and sulphur 2 - 10%, bitumen and other aggregates.

8. Asphalt mixture additive as claimed in claim 1, wherein final composition for bitumen mix road for hot temperature comprises bentonite 20- 50%, limestone 5- 15% and sulphur 0 - 5%, bitumen and other aggregates.

9. Asphalt mixture additive as claimed in claim 1, wherein final composition for concrete mix comprises bentonite 25 - 30%, limestone up to 10% and sulphur up to 5%, bitumen and other aggregates.

10. Asphalt mixture additive as claimed in claim 1, wherein final composition are useful for road and civil construction and paving procedure.