1

use of “plastic waste” as road construction material

Presented By:-Saief Mondal (CEN144028)

Ayaz Alam Khan (CEN144031)

2 Introduction:- Disposal of waste plastic is a major problem & it is non-

biodegradable. It mainly consists of low-density polyethylene. Burning of

these waste plastic causes environmental pollution. To find its utility in bituminous mixes for road construction,

Laboratory performance studies were conducted on bituminous mixes.

Laboratory studies proved that waste plastic enhances the property of the mix .

Improvement in properties of bituminous mix provides the solution for disposal in an useful way.

3 Material used:- Aggregate:- 1. Aggregate of 20mm, 10 mm. 2. Stone Dust and Lime as Filler

BITUMEN:- 1. 60/70, 80/100 grade bitumen.

WASTE PLASTIC:- 1. Waste plastic in the shredded form. (PVC is not Used)

4 Method of mixing:-STEP-1:- Plastics waste (bags, cups, bottles ) made out of PE, PP and PS should be cleaned & free from dust and is to be shredded into a size between 2.36mm and 4.75mm.

STEP-2A:- The aggregate mix is heated to 165°c (as per the IINR specification) and transferred to mixing chamber. Amount of plastic to be added is @8% of bitumen.

5 STEP-2B:- Similarly, the bitumen is to be heated to a maximum of 1600c in a separate chamber and kept ready (The temperature should be monitored to have good binding and to prevent weak bonding).

Step-3:-  At the mixing chamber, the shredded plastics waste is to be added. It get coated uniformly over the aggregate within 30 to 60 seconds, giving an oily look.

6 Step-4:- The plastics waste coated aggregate is mixed with hot bitumen and the resulted mix is used for road construction.

Step-5:- The road laying temperature is between 110°c to 120°c. The roller used is 8-ton capacity.

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AGGREGATES HOT AGGREGATES

165’C

SHREDDED WASTE PLASTIC

POLY COATED AGGREGATES

HOT BITUMEN AT 160’C

POLYMER BITUMEN AGGREGATES

MIXTURE

110’C-120’C ROAD

LAYING

OVERALL dry PROCESS

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STEP 1

• PLASTIC WASTE COLLECTION AND STORAGE

STEP 2

• CLEANING AND DRYING OF PLASTIC WASTES

STEP 3

• SHREDDING PLASTIC WASTES INTO REQUIRED SIZES

STEP 4

• BLENDING OF WASTE PLASTICS WITH HOT BITUMEN AT 1600 C

STEP 5

• STIRRING WITH MECHANICAL STIRRER & PROPER COOLING UP TO 1300C-1500C

STEP 6

• MIXING WITH AGGREGATES

STEP 7

• THE MIX IS KNOWN AS WASTE PLASTIC BITUMEN MIX(1200C-1400C) AND IS USED FOR ROAD LAYING AT 1100C-1300C

WET PROCESS

9SALIENT FEATURES OF DRY PROCESSv  Easy process without any new machineryv  Simple process without any industry involvement In situ process

v Use of lesser percentage of bitumen and thus savings on bitumen resource

v  Use of plastics waste for a safe and eco-friendly process

v Both Mini Hot Mix Plant and Central Mixing Plant can be used

v Only aggregate is polymer coated and bitumen is not modified

 

10 STRENGTH PARAMETEINRPROPERTIES

Modified Mix (Waste

plastic) 8 %by wt of bitumen

ConventionalMix

Marshall Stability (kg)

1700 1350Bulk

Density(gm/cc)

2.374 2.350

Air Voids (%) 4.4 3.5VFB (%) 73 76

Flow (mm) 4 4VMA (%) 16.5 15.6Retained

Stability (%)98 88

11 ADVANTAGESTECHNICA

L• No stripping and no

potholes.• Stronger road with

increased Marshalls stability.

• Increase in binding and better bonding.

• Better resistance towards rain water and stagnation.

SOCIO-ECONOMY

• Environmental benefits.• Municipal solid waste

management.• Employment generation.• Farming community.• National economy.

12 Material needed

Plain bitumenprocess

Plastics coatedaggregate (PCA)

80/100 Bitumen 11250Kg 10125KgPlastic waste ------ 1125Kg

Cost 393750 INR[ 354375(BIT)+

13500(plastic)] = 367875INR.

Cost Reduced NIL 25875.00 INRCarbon Credit Achieved on

avoiding burning of plastics

3.5tonnes

Cost Bitumen Approx. : 35,000/ton and Waste Plastic : Rs. 12000/ton Savings of bitumen = 1 ton Use of Plastics waste – (11,25, 000) carry bags (1.125 ton) Bitumen needed– 10125kG Plastics waste needed – 1125 kg

13 DISADVANTAGESTOXICS PRESENT IN THE CO-MINGLED

PLASTIC WASTE WOULD START LEACHING DURING CLEANING PROCESS

IT IS OPINED THAT THE FIINRT RAIN WILL TRIGGER LEACHING

“INDIA” CAN COUNTER THESE DISADVANTAGESBY IT’S DIVEINRE CLIMATIC CONDITIONS

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CONCLUSIONLab tests and real

time tests have revealed that the life expectancy of a plastic polymer road as compared to a normal road is at least 100% more.

15 REFERENCES

American Journal of Engineering Research (AJER) :- S.Rajasekaran1* , Dr. R. Vasudevan2 , Dr. Samuvel Paulraj3

International Journal of Application or Innovation in Engineering & Management :- Miss Apurva J Chavan1.

Image source- Google

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Thank you everyone

Special thanks to

 Prof Rajagopalan Vasudevan,

Professor of Chemistry at Thiagarajar College

of Engineering, Madurai